Texas Instruments | ATL431LI-Q1 / ATL432LI-Q1 High Bandwidth Low-IQ Programmable Shunt Regulator (Rev. A) | Datasheet | Texas Instruments ATL431LI-Q1 / ATL432LI-Q1 High Bandwidth Low-IQ Programmable Shunt Regulator (Rev. A) Datasheet

Texas Instruments ATL431LI-Q1 / ATL432LI-Q1 High Bandwidth Low-IQ Programmable Shunt Regulator (Rev. A) Datasheet
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ATL431LI-Q1
ATL432LI-Q1
SNVSBB0A – MAY 2019 – REVISED NOVEMBER 2019
ATL431LI-Q1 / ATL432LI-Q1 High Bandwidth Low-IQ Programmable Shunt Regulator
1 Features
3 Description
•
•
The ATL43xLI-Q1 is a three-terminal adjustable shunt
regulator, with specified thermal stability over
applicable automotive, commercial, and military
temperature ranges. Its output voltage can be set to
any value between Vref (approximately 2.5 V) and 36
V with two external resistors. The device has a typical
output impedance of 0.3 Ω. Its active output circuitry
provides a very sharp turn-on characteristic, making it
an excellent replacement for Zener diodes in many
applications, such as onboard regulation, adjustable
power supplies, and switching power supplies. This
device is a pin-to-pin alternative to the TL431LI-Q1
and TL432LI-Q1, with lower minimum operating
current to help reduce system power consumption.
The ATL432LI-Q1 has exactly the same functionality
and electrical specifications as the ATL431LI-Q1, but
has a different pinout for the DBZ package.
1
•
•
•
•
•
•
•
•
•
Qualified for automotive applications
AEC-Q100 qualified with the following results:
– Device temperature grade 1: –40°C to +125°C
ambient operating temperature
Reference voltage tolerance at 25°C
– 0.5% (B grade)
– 1% (A grade)
Minimum typical output voltage: 2.5 V
Adjustable output voltage: Vref to 36 V
Operation from −40°C to +125°C
27 mV maximum temperature drift
0.3-Ω typical output impedance
Sink-current capability
– Imin = 0.08 mA (max)
– IKA = 15 mA (max)
Reference input current IREF: 0.4 μA (max)
Deviation of reference input current over
temperature, II(dev): 0.3 μA (max)
The ATL431LI-Q1 is offered in two grades, with initial
tolerances (at 25°C) of 0.5%, and 1%, for the B and A
grade,
respectively.
The
ATL43xLI-Q1
is
characterized for operation from –40°C to +125°C,
and its low output drift versus temperature ensures
good stability over the entire temperature range.
2 Applications
•
•
•
•
•
Device Information(1)
Inverter and motor control
DC/DC converter
LED lighting
On-board charger (OBC)
Infotainment and cluster
PART NUMBER
ATL43xLI
PACKAGE (PIN)
SOT-23 (3)
BODY SIZE (NOM)
2.90 mm x 1.30 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
VKA
Input
IKA
Vref
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
ATL431LI-Q1
ATL432LI-Q1
SNVSBB0A – MAY 2019 – REVISED NOVEMBER 2019
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Table of Contents
1
2
3
4
5
6
7
8
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Device Comparison Table.....................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
3
4
7.1
7.2
7.3
7.4
7.5
7.6
4
4
4
4
5
6
Absolute Maximum Ratings ......................................
ESD Ratings..............................................................
Recommended Operating Conditions.......................
Thermal Information ..................................................
Electrical Characteristics...........................................
Typical Characteristics ..............................................
Parameter Measurement Information .................. 9
8.1 Temperature Coefficient............................................ 9
8.2 Dynamic Impedance ............................................... 10
9
Detailed Description ............................................ 11
9.1 Overview ................................................................. 11
9.2 Functional Block Diagram ....................................... 11
9.3 Feature Description................................................. 13
9.4 Device Functional Modes........................................ 13
10 Applications and Implementation...................... 14
10.1 Application Information.......................................... 14
10.2 Typical Applications .............................................. 14
10.3 System Examples ................................................. 24
11 Power Supply Recommendations ..................... 27
12 Layout................................................................... 27
12.1 Layout Guidelines ................................................. 27
12.2 Layout Example .................................................... 27
13 Device and Documentation Support ................. 28
13.1
13.2
13.3
13.4
13.5
13.6
13.7
13.8
Device Support......................................................
Documentation Support ........................................
Related Links ........................................................
Receiving Notification of Documentation Updates
Support Resources ...............................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
28
28
28
28
28
28
29
29
14 Mechanical, Packaging, and Orderable
Information ........................................................... 29
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (May 2019) to Revision A
•
2
Page
Changed device status from Advance Information to Production Data ................................................................................. 1
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5 Device Comparison Table
DEVICE PINOUT
INITIAL ACCURACY
OPERATING FREE-AIR TEMPERATURE (TA)
ATL431LI-Q1
ATL432LI-Q1
A: 1%
B: 0.5%
Q: -40°C to 125°C
6 Pin Configuration and Functions
ATL431LI-Q1 DBZ Package
3-Pin SOT-23
Top View
CATHODE
ATL432LI-Q1 DBZ Package
3-Pin SOT-23
Top View
1
3
REF
ANODE
1
3
REF
ANODE
2
CATHODE
2
Pin Functions
PIN
NAME
ATL431LI-Q1
ATL432LI-Q1
DBZ
DBZ
TYPE
DESCRIPTION
ANODE
3
3
O
Common pin, normally connected to ground
CATHODE
1
2
I/O
Shunt Current/Voltage input
REF
2
1
I
Threshold relative to common anode
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7 Specifications
7.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
MIN
VKA
Cathode Voltage (2)
IKA
Continuos Cathode Current Range
II(ref)
Reference Input Current
TJ
Tstg
(1)
(2)
MAX
UNIT
37
V
–10
18
mA
–5
10
mA
Operating Junction Temperature Range
–40
150
C
Storage Temperature Range
–65
150
C
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
All voltage values are with respect to ANODE, unless otherwise noted.
7.2 ESD Ratings
VALUE
Electrostatic
discharge
V(ESD)
(1)
Human body model (HBM), per AEC Q100-002 (1)
±4000
Charged-device model (CDM), per AEC Q100-011
±1000
UNIT
V
AEC Q100-002 indicates that HBM stressing shall be in accordance with the ANSI/ESDA/JEDEC JS-001 specification
7.3 Recommended Operating Conditions
MIN
MAX
UNIT
VKA
Cathode Voltage
VREF
36
V
IKA
Continuous Cathode Current Range
0.08
15
mA
TA
Operating Free-Air Temperature (1)
–40
125
C
(1)
ATL43xLIxQ
Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient
temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ can affect reliability. See the Semiconductor and IC
Package Thermal Metrics Application Report for more information.
7.4 Thermal Information
ATL43xLI
THERMAL METRIC (1)
DBZ
UNIT
3 PINS
RθJA
Junction-to-ambient thermal resistance
371.7
C/W
RθJC(top)
Junction-to-case (top) thermal resistance
145.9
C/W
RθJB
Junction-to-board thermal resistance
104.7
C/W
ψJT
Junction-to-top characterization parameter
23.9
C/W
ψJB
Juction-to-board characterization parameter
102.9
C/W
(1)
4
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics Application
Report.
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7.5 Electrical Characteristics
over recommended operating conditions, TA = 25°C (unless otherwise noted)
PARAMETER
TEST CIRCUIT
TEST CONDITIONS
VREF
Reference Voltage
See Figure 17
VKA = Vref, IKA = 1 mA
VI(dev)
Deviation of reference
input voltage over full
temperature range (1)
See Figure 17
VKA = Vref, IKA = 1 mA
ΔVref /
ΔVKA
Ratio of change in
reference voltage to the
change in cathode
voltage
See Figure 18
IKA = 1 mA
Iref
Reference Input Current See Figure 18
II(dev)
Deviation of reference
input current over full
temperature range (1)
Imin
Minimum cathode
current for regulation
Ioff
Off-state cathode
current
|ZKA|
(1)
(2)
Dynamic Impedance
(2)
MIN
TYP MAX
UNIT
ATL43xLIAx devices
2475 2500 2525
mV
ATL43xLIBx devices
2487 2500 2512
mV
ATL43xLIxQ devices
10
27
–1.4
–2.7
mV/V
–1
–2
mV/V
IKA = 1 mA, R1 = 10kΩ, R2 = ∞
0.2
0.4
µA
See Figure 18
IKA = 1 mA, R1 = 10kΩ, R2 = ∞
0.1
0.3
µA
See Figure 17
VKA = Vref
65
80
µA
See Figure 19
VKA = 36 V, Vref = 0
0.1
1
µA
See Figure 17
VKA = Vref, IKA = 1 mA to 15 mA
0.65
0.75
Ω
ΔVKA = 10 V - Vref
ΔVKA = 36 V - 10 V
mV
The deviation parameters VI(dev) and II(dev) are defined as the differences between the maximum and minimum values obtained over the
rated temperature range. For more details on VI(dev) and how it relates to the average temperature coefficient, see the Temperature
Coefficient section.
The dynamic impedance is defined by |ZKA| = ΔVKA/ΔIKA. For more details on |ZKA| and how it relates to Vout, see the Temperature
Coefficient section.
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7.6 Typical Characteristics
Data at high and low temperatures are applicable only within the recommended operating free-air temperature
ranges of the various devices.
0.5
2520
IKA = 1 mA
Iref - Reference Current - µA
Vref - Reference Voltage - mV
2515
2510
2505
2500
2495
2490
2485
0.4
0.3
0.2
0.1
2480
2475
-40
-20
0
20
40
60
TA (qC)
80
100
120
0
-50
140
Figure 1. Reference Voltage versus Free-Air Temperature
125
Figure 2. Reference Current versus Free-Air Temperature
200
15
VKA = Vref
175 T = 25°C
A
VKA = Vref
TA = 25°C
12
IKA - Cathode Current - µA
IKA - Cathode Current - mA
-25
0
25
50
75 100
TA - Free-Air Temperature - °C
9
6
3
0
150
125
Imin
100
75
50
25
0
-25
-50
-3
0
0.5
1
1.5
2
2.5
VKA - Cathode Voltage -V
0
3
D003
Figure 3. Cathode Current versus Cathode Voltage
D004
-0.35
VKA = 3 V to 36 V
-0.4
0.016
-0.45
'Vref / 'VKA = mV/V
Ioff - Off-State Cathode Current - PA
2.5
Figure 4. Cathode Current versus Cathode Voltage
0.02
0.012
0.008
-0.5
-0.55
-0.6
-0.65
-0.7
0.004
-0.75
0
-40 -20
0 20 40 60 80 100 120 140
TA - Free-Air Temperature - °C
Figure 5. Off-State Cathode Current
versus Free-Air Temperature
6
0.5
1
1.5
2
VKA - Cathode Voltage - V
-0.8
-50
-25
0
25
50
75
Temperature (°C)
100
125
D006
Figure 6. Ratio of Delta Reference Voltage to Delta Cathode
Voltage versus Free-Air Temperature
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75
200
60
160
45
120
30
80
15
40
IKA = 10 mA
TA = 25°C
Output
Phase - q
AV - Small-Signal Voltage Amplification - dB
Typical Characteristics (continued)
IKA
15 kΩ
9 µF
+
AV
Phase
0
100
1k
10k
100k
f - Frequency - Hz
0
10M
1M
232 Ω
−
8.25 kΩ
D000
GND
Figure 7. Small-Signal Voltage Amplification
versus Frequency
Figure 8. Test Circuit for Voltage Amplification
|ZKA| - Reference Impedance - Ohms
100
1 kΩ
IKA = 1 mA
50 T = 25°C
A
30
20
IKA
10
50 Ω
5
3
2
−
+
1
GND
0.5
0.3
0.2
0.1
1k
10k
100k
f - Frequency - Hz
1M
Figure 9. Reference Impedance versus Frequency
Figure 10. Test Circuit for Reference Impedance
6
Input
Input and Output Voltage - V
Output
220 Ω
TA = 25qC
Output
5
Pulse
Generator
f = 100 kHz
4
3
Output
50 Ω
2
GND
1
0
-1
0
1
2
3
4
t - Time - Ps
5
6
7
puls
Figure 11. Pulse Response
Figure 12. Test Circuit for Pulse Response
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Typical Characteristics (continued)
150 Ω
15
IKA - Cathode Current - mA
13
A VKA = Vref
B VKA = 5 V
C VKA = 10 V
IKA
Stable Region
+
11
VBATT
CL
−
9
7
TEST CIRCUIT FOR CURVE A
5
3
1
0.001
IKA
R1 = 10 kΩ
0.01
0.1
1
CL - Load Capacitance - µF
150 Ω
10
ATL4
The areas under the curves represent conditions that may cause the
device to oscillate. For curves B and C, R2 and V+ are adjusted to
establish the initial VKA and IKA conditions, with CL = 0. VBATT and CL
then are adjusted to determine the ranges of stability.
Figure 13. Stability Boundary Conditions for All ATL431LIQ1, ATL432LI-Q1 Devices Above 1 mA
CL
+
R2
VBATT
−
TEST CIRCUIT FOR CURVES B, C, AND D
Figure 14. Test Circuit for Stability Boundary Conditions
IKA - Cathode Current - mA
1
0.8
150 Ω
A VKA = Vref
B VKA = 5 V
C VKA = 10 V
IKA
+
VBATT
CL
−
0.6
0.4
TEST CIRCUIT FOR CURVE A
Stable Region
0.2
IKA
R1 = 10 kΩ
0
0.001
CL
0.01
0.1
1
CL - Load Capacitance - µF
10
+
R2
ATL4
The areas in-between the curves represent conditions that may cause
the device to oscillate. For curves B and C, R2 and V+ are adjusted
to establish the initial VKA and IKA conditions, with CL = 0. VBATT and
CL then are adjusted to determine the ranges of stability.
Figure 15. Stability Boundary Conditions for All ATL431LIQ1, ATL432LI-Q1 Devices Below 1 mA
8
150 Ω
VBATT
−
TEST CIRCUIT FOR CURVES B, C, AND D
Figure 16. Test Circuit for Stability Boundary Conditions
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8 Parameter Measurement Information
VKA
Input
IKA
Vref
Figure 17. Test Circuit for VKA = Vref
Input
VKA
IKA
R1
Iref
R2
Vref
R1 ö
æ
VKA = Vref ç 1 +
÷ + Iref × R1
R2 ø
è
Figure 18. Test Circuit for VKA > Vref
Input
VKA
Ioff
Figure 19. Test Circuit for Ioff
8.1 Temperature Coefficient
The deviation of the reference voltage, Vref, over the full temperature range is known as VI(dev). The parameter of
VI(dev) can be used to find the temperature coefficient of the device. The average full-range temperature
coefficient of the reference input voltage, αVref, is defined as:
αVref is positive or negative, depending on whether minimum Vref or maximum Vref, respectively, occurs at the
lower temperature. The full-range temperature coefficient is an average and, therefore, any subsection of the
rated operating temperature range can yield a value that is greater or less than the average. For more details on
temperature coefficient, refer to the Voltage Reference Selection Basics White Paper.
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8.2 Dynamic Impedance
'VKA
'IKA . When the device is operating with two external resistors
The dynamic impedance is defined as:
'V
z'
'I , which is approximately equal to
(see Figure 18), the total dynamic impedance of the circuit is given by:
R1 ·
§
ZKA ¨ 1
¸
© R2 ¹ .
ZKA
Itest
P/
IKA (mA)
The VKA of the ATL431LI-Q1 can be affected by the dynamic impedance. The ATL431LI-Q1 test current Itest for
VKA is specified in the Electrical Characteristics. Any deviation from Itest can cause deviation on the output VKA.
Figure 20 shows the effect of the dynamic impedance on the VKA.
IKA
IKA(min)
0
VKA (V)
Ps
Figure 20. Dynamic Impedance
10
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9 Detailed Description
9.1 Overview
This standard device has proven ubiquity and versatility across a wide range of applications, ranging from power
to signal path. This is due to its key components containing an accurate voltage reference and op amp, which
are very fundamental analog building blocks. The ATL431LI-Q1 is used in conjunction with the key components
to behave as the following:
• Single voltage reference
• Error amplifier
• Voltage clamp
• Comparator with integrated reference
ATL431LI-Q1 can be operated and adjusted to cathode voltages from 2.5 V to 36 V, making this part optimal for
a wide range of end equipments in industrial, auto, telecom, and computing. For this device to behave as a shunt
regulator or error amplifier, >80 µA (Imin(maximum)) must be supplied in to the cathode pin. Under this condition,
feedback can be applied from the Cathode and Ref pins to create a replica of the internal reference voltage.
Various reference voltage options can be purchased with initial tolerances (at 25°C) of 0.5% and 1%. These
reference options are denoted by B (0.5%) and A (1.0%) after the ATL431LI-Q1 or ATL432LI-Q1. ATL431LI-Q1
and ATL432LI-Q1 are both functionally the same, but have different pinout options. The ATL43xLI-Q1 devices
are characterized for operation from –40°C to +125°C.
9.2 Functional Block Diagram
CATHODE
+
REF
_
Vref
ANODE
Figure 21. Equivalent Schematic
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Functional Block Diagram (continued)
CATHODE
REF
ANODE
Figure 22. Detailed Schematic
12
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9.3 Feature Description
The ATL431LI-Q1 consists of an internal reference and amplifier that outputs a sink current based on the
difference between the reference pin and the virtual internal pin. The sink current is produced by the internal
Darlington pair, shown in Figure 21. A Darlington pair is used for this device to be able to sink a maximum
current of 15 mA.
When operated with enough voltage headroom (≥ 2.5 V) and cathode current (IKA), the ATL431LI-Q1 forces the
reference pin to 2.5 V. However, the reference pin cannot be left floating, as it needs IREF ≥ 0.4 µA (see the
Specifications). This is because the reference pin is driven into an NPN, which needs base current to operate
properly.
When feedback is applied from the Cathode and Reference pins, the ATL431LI-Q1 behaves as a Zener diode,
regulating to a constant voltage dependent on current being supplied into the cathode. This is due to the internal
amplifier and reference entering the proper operating regions. The same amount of current needed in the above
feedback situation must be applied to this device in open loop, servo, or error amplifying implementations for it to
be in the proper linear region giving ATL431LI-Q1 enough gain.
Unlike many linear regulators, ATL431LI-Q1 is internally compensated to be stable without an output capacitor
between the cathode and anode. However, if it is desired to use an output capacitor Figure 13 can be used as a
guide to assist in choosing the correct capacitor to maintain stability.
9.4 Device Functional Modes
9.4.1 Open Loop (Comparator)
When the cathode/output voltage or current of ATL431LI-Q1 is not being fed back to the reference/input pin in
any form, this device is operating in open loop. With proper cathode current (Ika) applied to this device, the
ATL431LI-Q1 has the characteristics shown in Figure 21. With such high gain in this configuration, the ATL431LIQ1 is typically used as a comparator. With the reference integrated makes ATL431LI-Q1 the preferred choice
when users are trying to monitor a certain level of a single signal.
9.4.2 Closed Loop
When the cathode/output voltage or current of the ATL431LI-Q1 is being fed back to the reference/input pin in
any form, this device is operating in closed loop. The majority of applications involving ATL431LI-Q1 use it in this
manner to regulate a fixed voltage or current. The feedback enables this device to behave as an error amplifier,
computing a portion of the output voltage and adjusting it to maintain the desired regulation. This is done by
relating the output voltage back to the reference pin in a manner to make it equal to the internal reference
voltage, which can be accomplished via resistive or direct feedback.
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10 Applications and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
10.1 Application Information
As this device has many applications and setups, there are many situations that this data sheet cannot
characterize in detail. The linked application note will help the designer make the best choices when using this
part.
Setting the Shunt Voltage on an Adjustable Shunt Regulator Application Note assists with setting the shunt
voltage to achieve optimum accuracy for this device.
10.2 Typical Applications
10.2.1 Comparator With Integrated Reference
Vsup
Rsup
Vout
CATHODE
R1
VIN
RIN
REF
VL
+
R2
2.5V
ANODE
Figure 23. Comparator Application Schematic
14
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Typical Applications (continued)
10.2.2 Design Requirements
For this design example, use the parameters listed in Table 1 as the input parameters.
Table 1. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
Input Voltage Range
0 V to 5 V
Input Resistance
10 kΩ
Supply Voltage
24 V
Cathode Current (Ik)
5 mA
Output Voltage Level
~2 V – VSUP
Logic Input Thresholds VIH/VIL
VL
10.2.3 Detailed Design Procedure
When using the ATL431LI-Q1 as a comparator with reference, determine the following:
• Input voltage range
• Reference voltage accuracy
• Output logic input high and low level thresholds
• Current source resistance
10.2.3.1 Basic Operation
In the configuration shown in Figure 23, the ATL431LI-Q1 behaves as a comparator, comparing the VREF pin
voltage to the internal virtual reference voltage. When provided a proper cathode current (IK), ATL431LI-Q1 has
enough open-loop gain to provide a quick response. This can be seen in Figure 24 where the RSUP = 10 kΩ (IKA
= 500 µA) situation responds much slower than RSUP = 1 kΩ (IKA = 5 mA). With the ATL431LI-Q1 max operating
current (IMIN) being 1 mA, operation below that can result in low gain, leading to a slow response.
10.2.3.1.1 Overdrive
Slow or inaccurate responses can also occur when the reference pin is not provided enough overdrive voltage.
This is the amount of voltage that is higher than the internal virtual reference. The internal virtual reference
voltage is within the range of 2.5 V ±(0.5% or 1.0%) depending on which version is being used. The more
overdrive voltage provided, the faster the ATL431LI-Q1 will respond.
For applications where ATL431LI-Q1 is being used as a comparator, it is best to set the trip point to greater than
the positive expected error (that is +1.0% for the A version). For fast response, setting the trip point to >10% of
the internal VREF suffices.
For minimal voltage drop or difference from Vin to the ref pin, TI recommends to use an input resistor <10 kΩ to
provide Iref.
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10.2.3.2 Output Voltage and Logic Input Level
For ATL431LI-Q1 to properly be used as a comparator, the logic output must be readable by the receiving logic
device. This is accomplished by knowing the input high and low level threshold voltage levels, typically denoted
by VIH and VIL.
As seen in Figure 24, the output low level voltage of the ATL431LI-Q1 in open-loop/comparator mode is
approximately 2 V, which is typically sufficient for 5 V supplied logic. However, this does not work for 3.3 V and
1.8 V supplied logic. To accommodate this, a resistive divider can be tied to the output to attenuate the output
voltage to a voltage legible to the receiving low voltage logic device.
The output high voltage of the ATL431 is equal to VSUP due to ATL431LI-Q1 being open-collector. If VSUP is
much higher than the maximum input voltage tolerance of the receiving logic, the output must be attenuated to
accommodate the reliability of the outgoing logic.
When using a resistive divider on the output, make sure the sum of the resistive divider (R1 and R2 in Figure 23)
is much greater than RSUP to not interfere with the ability of the ATL431LI-Q1 to pull close to VSUP when turning
off.
10.2.3.2.1 Input Resistance
The ATL431LI-Q1 requires an input resistance in this application to source the reference current (IREF) needed
from this device to be in the proper operating regions while turning on. The actual voltage seen at the ref pin is
VREF = VIN - IREF × RIN because IREF can be as high as 4 µA. TI recommends to use a resistance small enough
that mitigates the error that IREF creates from VIN.
10.2.4 Application Curves
5.5
5
4.5
4
Voltage (V)
3.5
3
2.5
2
1.5
1
Vin
Vka(Rsup=10k:)
Vka(Rsup=1k:)
0.5
0
-0.5
-0.001
-0.0006
-0.0002
0.0002
Time (s)
0.0006
0.001
D001
Figure 24. Output Response With Various Cathode Currents
16
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10.2.5 Precision LED Lighting Current Sink Regulator
VCC
VCC
R1 =
IOUT
hFE
IOUT =
IKA
VREF
RS
VCC
IOUT
R1
ATL431LI-Q1
RS
GND
Figure 25. LED Lighting Current Sink Regulator
10.2.5.1 Design Requirements
For this design example, use the parameters listed in Table 1 as the input parameters.
Table 2. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
Supply Voltage (VI(BATT))
5V
Sink Current (IO)
100 mA
Cathode Current (Ik)
5 mA
10.2.5.2 Detailed Design Procedure
When using the ATL43xLI-Q1 as a constant current sink, determine the following:
• Output current range
• Output current accuracy
• Power consumption for the ATL43xLI-Q1
10.2.5.2.1 Basic Operation
In the configuration shown, the ATL43xLI-Q1 acts as a control component within a feedback loop of the constant
current sink. Working with an external passing component such as a BJT, the ATL43xLI-Q1 provides precision
current sink with accuracy set by itself and the sense resistor RS. The LEDs are lit based on the desired current
sink and regulated for accurate brightness and color.
10.2.5.2.1.1 Output Current Range and Accuracy
The output current range of the circuit is determined by the equation shown in the configuration. Keep in mind
that the VREF equals to 2.500 V. When choosing the sense resistor RS, it needs to generate 2.500 V for the
TL43xLI-Q1 when IO reaches the target current. If the overhead voltage of 2.500 V is not acceptable, consider
lower voltage reference devices such as the TLV43x-Q1 or TLVH43x-Q1.
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The output current accuracy is determined by both the accuracy of the ATL43xLI-Q1 chosen, as well as the
accuracy of the sense resistor RS. The internal virtual reference voltage of ATL43xLI-Q1 is within the range of
2.500 V ±(0.5% or 1.0%), depending on which version is being used. Another consideration for the output current
accuracy is the temperature coefficient of the ATL43xLI-Q1 and RS. Refer to the for the specification of these
parameters.
10.2.5.2.2 Power Consumption
For the ATL43xLI-Q1 to properly be used as a control component in this circuit, the minimum operating current
needs to be reached. This is accomplished by setting the external biasing resistor in series with the ATL43xLIQ1.
To achieve lower power consumption, the ATL43xLI-Q1 is used due to its 65 µA typical minimum cathode
current, Imin.
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10.2.6 Shunt Regulator/Reference
RSUP
VSUP
VO = ( 1 +
R1
0.1%
CATHODE
REF
Vr ef
R1
) Vref
R2
R2
0.1%
ATL431LI-Q1
ANODE
CL
Figure 26. Shunt Regulator Schematic
10.2.6.1 Design Requirements
For this design example, use the parameters listed in Table 1 as the input parameters.
Table 3. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
Reference Initial Accuracy
1.0%
Supply Voltage
24 V
Cathode Current (Ik)
5 mA
Output Voltage Level
2.5 V–36 V
Load Capacitance
2 µF
Feedback Resistor Values and Accuracy (R1 and R2)
10 kΩ
10.2.6.2 Detailed Design Procedure
When using ATL431LI-Q1 as a shunt regulator, determine the following:
• Input voltage range
• Temperature range
• Total accuracy
• Cathode current
• Reference initial accuracy
• Output capacitance
10.2.6.2.1
Programming Output/Cathode Voltage
To program the cathode voltage to a regulated voltage, a resistive bridge must be shunted between the cathode
and anode pins with the mid point tied to the reference pin. This can be seen in Figure 26 with R1 and R2 being
the resistive bridge. The cathode/output voltage in the shunt regulator configuration can be approximated by the
equation shown in Figure 26. The cathode voltage can be more accuratel, which can be determined by taking in
to account the cathode current:
Vo = (1+R1/R2) × VREF-IREF × R1
(1)
For this equation to be valid, the ATL431LI-Q1 must be fully biased so that it has enough open loop gain to
mitigate any gain error. This can be done by meeting the Imin spec denoted in the Specifications.
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10.2.6.2.2 Total Accuracy
When programming the output above unity gain (VKA = VREF), the ATL431LI-Q1 is susceptible to other errors that
can effect the overall accuracy beyond VREF. These errors include:
• R1 and R2 accuracies
• VI(dev): Change in reference voltage over temperature
• ΔVREF / ΔVKA: Change in reference voltage to the change in cathode voltage
• |zKA|: Dynamic impedance, causing a change in cathode voltage with cathode current
Worst case cathode voltage can be determined taking all of the variables in to account. The Setting the Shunt
Voltage on an Adjustable Shunt Regulator Application Note assists designers in setting the shunt voltage to
achieve optimum accuracy for this device.
10.2.6.2.3 Stability
Though ATL431LI-Q1 is stable with no capacitive load, the device that receives the output voltage of the shunt
regulator can present a capacitive load that is within the ATL431LI-Q1 region of stability, shown in Figure 13.
Also, designers can use capacitive loads to improve the transient response or for power supply decoupling.
When using additional capacitance between Cathode and Anode, see Figure 13. Also, Understanding Stability
Boundary Conditions Charts in TL431, TL432 Data Sheet Application Note provides a deeper understanding of
the stability characteristics of this device and aids the user in making the right choices when choosing a load
capacitor.
10.2.6.2.4 Start-Up Time
As shown in Figure 27, the ATL431LI-Q1 has a fast response up to approximately 2 V and then slowly charges
to its programmed value. This is due to the compensation capacitance (shown in Figure 13) the ATL43xLI-Q1
has to meet its stability criteria. Despite the secondary delay, ATL43xLI-Q1 still has a fast response suitable for
many clamp applications.
10.2.6.3 Application Curves
27
Vsup
Vka=Vref
R1=10k: & R2=10k:
R1=38k: & R2=10k:
24
21
Voltage (V)
18
15
12
9
6
3
0
-3
-6
-5E-6
-3E-6
-1E-6
1E-6
Time (s)
3E-6
5E-6
D001
Figure 27. ATL43xLI-Q1 Start-Up Response
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10.2.7 Isolated Flyback with Optocoupler
VOUT
VIN AC
VDD
VPC
VDD
VSC
HV
UCC28740
PWM Controller
VS
UCC24636
SR Controller
DRV
DRV
FB
TBLK
CS
ATL431LI-Q1
GND
Figure 28. Isolated Flyback with Optocoupler
10.2.7.1 Design Requirements
The ATL431LI-Q1 is used in the feedback network on the secondary side for a isolated flyback with optocoupler
design. Figure 28 shows the simplified flyback converter that used the ATL431LI-Q1. For this design example,
use the parameters in Table 4 as the input parameters.
Table 4. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
Voltage Output
20 V
Feedback Network Quiescent Current (Iq)
<40 mW
10.2.7.1.1 Detailed Design Procedure
In this example, a simplified design procedure will be discussed. The compensation network for the feedback
network is beyond the scope of this section. Details on compensation network can be found in Compensation
Design with TL431 for UCC28600 Application Report.
The goal of this design is to design a low standby current feedback network to meet the Europe CoC Tier 2 and
United States DoE Level VI requirements. To meet the design requirements, the system standby power needs to
be below 75 mW. To meet this, the feedback network needs to consume less than 40 mW to allow margin for the
power losses on the primary side controller and passive components. This can pose a challenge in systems
greater than 10 V.
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VOUT
Rs
Iq
Iq
IKA
R1
IRE
F
ATL431LI-Q1
R2
Figure 29. Feedback Quiescent Current
10.2.7.1.1.1 ATL431LI-Q1 Biasing
Figure 29 shows the simplified version of the feedback network. The standby Iq of the system is dependent on
two paths: the ATL431LI-Q1 biasing path and the resistor feedback path. With the given design requirements,
the total current through the feedback network cannot exceed 2 mA.
The design goal is to take full advantage of the Imin to set the IKA of the ATL431LI-Q1. The benefit of the
ATL431LI-Q1 is its low Imin of 80 µA which allows the IKA to be lower at a full load condition compared to typical
TL431LI-Q1 devices. This helps lower the IKA at the no-load condition which is higher than the full load condition
due to the dynamic changes in the IKA as the system load varies. The IKA at no-load, IOPTNL, is dependent the
value of Rs which is the biasing resistor. Rs is very application-specific and is dependent on variables such as
the CTR of the optocoupler, voltage, and current at no-load. This can be seen in Equation 2. It is possible to
lower IOPTNL to a value of 1.5 mA for a power loss of 30 mW by using an optocoupler with a high CTR.
Rs | (VOUT VOPTNL 2 V) / I OPTNL
VOPTNL
IOPTNL
Optocoupler Voltage at No Load Conditions
Optocoupler Current at No Load Conditions
(2)
10.2.7.1.1.2 Resistor Feedback Network
The feedback resistors set the output voltage of the secondary side and consume the same Iq at a fixed voltage.
The design goal for the feedback resistor path is to minimize the resistor error while maintaining a low Iq. For this
system example, the feedback network path in this design consumes 0.5 mA to allow enough current for
ATL431LI-Q1 biasing. The resistors, R1 and R2, are sized based on a 0.5 mA budget for Iq and Iref. By using the
resistor values from Equation 3 and Equation 4, the total power consumption is 10 mW. This can be further
decreased by using larger resistors.
R1 (VOUT VREF ) / IFB
22
R1
(20 V 2.5 V) / 0.5mA
R1
35k:
R2
V REF / (I FB I REF )
R2
2.5 V / (0.5mA 0.4PA)
R2
5.004k:
(3)
(4)
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10.2.8 Adjustable Reference for Tracking LDO
10.2.8.1 Design Requirements
The ATL431LI-Q1 is used as a reference voltage to help regulate a supply voltage off an LDO. By adjusting the
cathode voltage, the output voltage of the LDO can vary. The TPS7B4250-Q1 is a voltage-tracking LDO with an
adjustable pin which needs a precise reference voltage to change the regulate output voltage.
Table 5. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
Input Voltage
4 V to 40 V
ADJ Reference Voltage
2.500 V–18 V
Output Voltage
2.500 V–18 V
Output Current Rating
50 mA
Output Capacitor Range
1 µF to 50 µF
Output Capacitor ESR Range
1 mΩ to 20 Ω
10.2.8.2 Detailed Design Procedure
The goal of this design is to create a precision and stable output stage using an LDO that requires an external
voltage reference such as the TPS7B4250-Q1. To begin the design process, the input and desired output voltage
range is required. The ATL431LI-Q1 can be adjusted between 2.5 V and 36 V so it covers most of the output
voltage rating of TPS7B42500-Q1. For reference voltage under 2.5 V, the TLV431-Q1 voltage reference can be
used. The input and output capacitor must also be taken into consideration for decoupling and stability.
VOUT
VIN
Vbat
Vreg
2.2 µF
1 µF
TPS7B4250-Q1
ADJ/EN
ATL431LI-Q1
GND
0.1 µF
Figure 30. Feedback Quiescent Current
10.2.8.2.1 External Capacitors
An input capacitor, CI, is recommended to buffer line influences. Connect the capacitors close to the IC pins.
The output capacitor for the TPS7B4250-Q1 device is required for stability. Without the output capacitor, the
regulator oscillates. The actual size and type of the output capacitor can vary based on the application load and
temperature range. The effective series resistance (ESR) of the capacitor is also a factor in the IC stability. The
worst case is determined at the minimum ambient temperature and maximum load expected. To ensure stability
of TPS7B4250-Q1 device, the device requires an output capacitor between 1 µF and 50 µF with an ESR range
between 0.001 Ω and 20 Ω that can cover most types of capacitor ESR variation under the recommend operating
conditions. As a result, the output capacitor selection is flexible.
The capacitor must also be rated at all ambient temperature expected in the system. To maintain regulator
stability down to –40°C, use a capacitor rated at that temperature.
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10.3 System Examples
VI(BATT)
R
(see Note A)
2N222
2N222
30 Ω
4.7 kΩ
0.01 µF
ATL431LI-Q1
VO
R1
0.1%
R2
0.1%
R1 ö
æ
VO = ç 1 +
÷ Vref
R2 ø
è
R should provide cathode current ≥ 80 µA to the ATL431LI-Q1 at minimum V(BATT).
Figure 31. Precision High-Current Series Regulator
VI(BATT)
IN
uA7805
OUT
Common
VO
R1
ATL431LI-Q1
(
(
VO = 1 + R1 Vref
R2
Minimum V
V + 5V
O = ref
R2
Figure 32. Output Control of a Three-Terminal Fixed Regulator
VI(BATT)
VO
(
(
VO = 1 + R1 Vref
R2
R1
ATL431LI-Q1
R2
Figure 33. High-Current Shunt Regulator
VI(BATT)
VO
R1
ATL431LI-Q1
R2
C
(see Note A)
Refer to the stability boundary conditions in Figure 13 to determine allowable values for C.
Figure 34. Crowbar Circuit
24
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System Examples (continued)
IN
VI(BATT)
LM317
OUT
VO ≈5 V, 1.5 A
Adjust
8.2 kΩ
243 Ω
0.1%
ATL431LI-Q1
243 Ω
0.1%
Figure 35. Precision 5-V, 1.5-A Regulator
VI(BATT)
VO ≈5 V
Rb
(see Note A)
27.4 kΩ
0.1%
ATL431LI-Q1
27.4 kΩ
0.1%
Rb should provide cathode current ≥80 µA to the ATL431LI-Q1.
Figure 36. Efficient 5-V Low-Dropout (LDO) Regulator Configuration
12 V
VCC
6.8 kΩ
5V
10 kΩ
−
10 kΩ
0.1%
ATL431LI-Q1
10 kΩ
0.1%
+
X
Not
Used
TL598
Feedback
Figure 37. PWM Converter With Reference
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System Examples (continued)
R3
(see Note A)
VI(BATT)
R4
(see Note A)
R1B
R1A
Low Limit = 1 + R1B V ref
R2B
ATL431LI-Q1
High Limit = 1 + R1A V ref
R2A
R2A
LED on When Low Limit < VI(BATT) < High Limit
R2B
Select R3 and R4 to provide the desired LED intensity and cathode current ≥80 µA to the ATL431LI-Q1 at the
available VI(BATT).
Figure 38. Voltage Monitor
650 12 V
2 k
R
ATL431LI-Q1
On
Off
C
Delay = R × C × ln
12 V
12 V – Vref
Figure 39. Delay Timer
RCL
0.1%
VI(BATT)
IO
Iout =
R1
ATL431LI-Q1
R1 =
V ref
+ IKA
R CL
V I(BATT)
I
O
h FE
+ IKA
Figure 40. Precision Current Limiter
VI(BATT)
IO
IO =
ATL431LI-Q1
Vref
RS
RS
0.1%
Figure 41. Precision Constant-Current Sink
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11 Power Supply Recommendations
When using ATL43xLI-Q1 as a Linear Regulator to supply a load, designers typically uses a bypass capacitor on
the output/cathode pin. When doing this, be sure that the capacitance is within the stability criteria shown in
Figure 13.
To not exceed the maximum cathode current, be sure that the supply voltage is current limited. Also, be sure to
limit the current being driven into the Ref pin, so you do not exceed its absolute maximum rating.
For applications shunting high currents, pay attention to the cathode and anode trace lengths, adjusting the width
of the traces to have the proper current density.
12 Layout
12.1 Layout Guidelines
Bypass capacitors must be placed as close to the part as possible. Current-carrying traces need to have widths
appropriate for the amount of current they are carrying; in the case of the ATL43xLI-Q1, these currents are low.
12.2 Layout Example
ATL432LI-Q1
(TOP VIEW)
Rref
Vin
REF
1
Rsup
Vsup
ANODE
3
CATHODE
2
GND
CL
GND
Figure 42. DBZ Layout Example
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13 Device and Documentation Support
13.1 Device Support
13.1.1 Device Nomenclature
TI assigns suffixes and prefixes to differentiate all the combinations of the ATL43xLI-Q1 family. More details and
possible orderable combinations are located in the Package Option Addendum.
ATL431LI X X XXX X XX
Initial
Operating Free-Air
Accuracy
Temperature
Product
1: ATL431LI
2: ATL432LI*
*(Cathode and REF
pins are switched)
B: 0.5%
A: 1%
Q: -40°C to 125°C
Package
Type
DBZ: SOT-23-3
Package
Quantity Qualification
R: Tape & Reel
Q1: AEC-Q100
13.2 Documentation Support
13.2.1 Related Documentation
For related documentation see the following:
Texas Instruments, Setting the Shunt Voltage on an Adjustable Shunt Regulator
13.3 Related Links
The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to order now.
Table 6. Related Links
PARTS
PRODUCT FOLDER
ORDER NOW
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
ATL431LI-Q1
Click here
Click here
Click here
Click here
Click here
ATL432LI-Q1
Click here
Click here
Click here
Click here
Click here
13.4 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
13.5 Support Resources
TI E2E™ support forums are an engineer's go-to source for fast, verified answers and design help — straight
from the experts. Search existing answers or ask your own question to get the quick design help you need.
Linked content is provided "AS IS" by the respective contributors. They do not constitute TI specifications and do
not necessarily reflect TI's views; see TI's Terms of Use.
13.6 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
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13.7 Electrostatic Discharge Caution
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
13.8 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
14 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGE OPTION ADDENDUM
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10-Jan-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
ATL431LIAQDBZRQ1
ACTIVE
SOT-23
DBZ
3
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
22XP
ATL431LIBQDBZRQ1
ACTIVE
SOT-23
DBZ
3
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
22ZP
ATL432LIAQDBZRQ1
ACTIVE
SOT-23
DBZ
3
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
23AP
ATL432LIBQDBZRQ1
ACTIVE
SOT-23
DBZ
3
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
23BP
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3)
MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
10-Jan-2020
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF ATL431LI-Q1, ATL432LI-Q1 :
• Catalog: ATL431LI, ATL432LI
NOTE: Qualified Version Definitions:
• Catalog - TI's standard catalog product
Addendum-Page 2
PACKAGE MATERIALS INFORMATION
www.ti.com
27-Nov-2019
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
B0
(mm)
K0
(mm)
P1
(mm)
ATL431LIAQDBZRQ1
SOT-23
DBZ
3
3000
178.0
9.0
ATL431LIBQDBZRQ1
SOT-23
DBZ
3
3000
178.0
ATL432LIAQDBZRQ1
SOT-23
DBZ
3
3000
178.0
ATL432LIBQDBZRQ1
SOT-23
DBZ
3
3000
178.0
3.15
2.77
1.22
4.0
8.0
Q3
9.0
3.15
2.77
1.22
4.0
8.0
Q3
9.0
3.15
2.77
1.22
4.0
8.0
Q3
9.0
3.15
2.77
1.22
4.0
8.0
Q3
Pack Materials-Page 1
W
Pin1
(mm) Quadrant
PACKAGE MATERIALS INFORMATION
www.ti.com
27-Nov-2019
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
ATL431LIAQDBZRQ1
SOT-23
DBZ
3
3000
180.0
180.0
18.0
ATL431LIBQDBZRQ1
SOT-23
DBZ
3
3000
180.0
180.0
18.0
ATL432LIAQDBZRQ1
SOT-23
DBZ
3
3000
180.0
180.0
18.0
ATL432LIBQDBZRQ1
SOT-23
DBZ
3
3000
180.0
180.0
18.0
Pack Materials-Page 2
4203227/C
PACKAGE OUTLINE
DBZ0003A
SOT-23 - 1.12 mm max height
SCALE 4.000
SMALL OUTLINE TRANSISTOR
C
2.64
2.10
1.4
1.2
PIN 1
INDEX AREA
1.12 MAX
B
A
0.1 C
1
0.95
3.04
2.80
1.9
3X
3
0.5
0.3
0.2
2
(0.95)
C A B
0.25
GAGE PLANE
0 -8 TYP
0.10
TYP
0.01
0.20
TYP
0.08
0.6
TYP
0.2
SEATING PLANE
4214838/C 04/2017
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. Reference JEDEC registration TO-236, except minimum foot length.
www.ti.com
EXAMPLE BOARD LAYOUT
DBZ0003A
SOT-23 - 1.12 mm max height
SMALL OUTLINE TRANSISTOR
PKG
3X (1.3)
1
3X (0.6)
SYMM
3
2X (0.95)
2
(R0.05) TYP
(2.1)
LAND PATTERN EXAMPLE
SCALE:15X
SOLDER MASK
OPENING
METAL
SOLDER MASK
OPENING
METAL UNDER
SOLDER MASK
0.07 MIN
ALL AROUND
0.07 MAX
ALL AROUND
NON SOLDER MASK
DEFINED
(PREFERRED)
SOLDER MASK
DEFINED
SOLDER MASK DETAILS
4214838/C 04/2017
NOTES: (continued)
4. Publication IPC-7351 may have alternate designs.
5. Solder mask tolerances between and around signal pads can vary based on board fabrication site.
www.ti.com
EXAMPLE STENCIL DESIGN
DBZ0003A
SOT-23 - 1.12 mm max height
SMALL OUTLINE TRANSISTOR
PKG
3X (1.3)
1
3X (0.6)
SYMM
3
2X(0.95)
2
(R0.05) TYP
(2.1)
SOLDER PASTE EXAMPLE
BASED ON 0.125 THICK STENCIL
SCALE:15X
4214838/C 04/2017
NOTES: (continued)
6. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate
design recommendations.
7. Board assembly site may have different recommendations for stencil design.
www.ti.com
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TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATASHEETS), DESIGN RESOURCES (INCLUDING REFERENCE
DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS”
AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY
IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD
PARTY INTELLECTUAL PROPERTY RIGHTS.
These resources are intended for skilled developers designing with TI products. You are solely responsible for (1) selecting the appropriate
TI products for your application, (2) designing, validating and testing your application, and (3) ensuring your application meets applicable
standards, and any other safety, security, or other requirements. These resources are subject to change without notice. TI grants you
permission to use these resources only for development of an application that uses the TI products described in the resource. Other
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warranties or warranty disclaimers for TI products.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2020, Texas Instruments Incorporated
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