Texas Instruments | TL431LI-Q1 / TL432LI-Q1 Programmable Shunt Regulator With Optimized Reference Current (Rev. A) | Datasheet | Texas Instruments TL431LI-Q1 / TL432LI-Q1 Programmable Shunt Regulator With Optimized Reference Current (Rev. A) Datasheet

Texas Instruments TL431LI-Q1 / TL432LI-Q1 Programmable Shunt Regulator With Optimized Reference Current (Rev. A) Datasheet
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TL431LI-Q1
TL432LI-Q1
SNVSBA4A – MAY 2019 – REVISED NOVEMBER 2019
TL431LI-Q1 / TL432LI-Q1 Programmable Shunt Regulator With Optimized Reference
Current
1 Features
3 Description
•
•
The TL431LI-Q1 is a three-terminal adjustable shunt
regulator, with specified thermal stability over
applicable automotive, commercial, and military
temperature ranges. The output voltage can be set to
any value between Vref (approximately 2.495 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
industry standard TL431-Q1 with optimized Iref and
IIdev performance. The lower Iref and IIdev values of the
TL431LI-Q1 enable designers to achieve higher
system accuracy and lower leakage current. The
TL432LI-Q1 has exactly the same functionality and
electrical specifications as the TL431LI-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
– Device temperature grade 0: –40°C to +150°C
ambient operating temperature
Reference voltage tolerance at 25°C
– 0.5% (B grade)
– 1% (A grade)
Minimum typical output voltage: 2.495 V
Adjustable output voltage: Vref to 36 V
27 mV maximum temperature drift for grade 1
34 mV maximum temperature drift for grade 0
0.3-Ω typical output impedance
Sink-current capability
– Imin = 0.6 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)
2 Applications
•
•
•
•
•
•
•
•
•
•
Inverter and motor control
DC/DC converter
LED lighting
On-board charger (OBC)
Infotainment and cluster
Engine management actuator
Transmission
Power steering
Powertrain exhaust sensor
Alternator starter
The TL431LI-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 TL431LI-Q1 is also available
in two temperature grades: grade 1 (denoted by a 'Q'
in the part number), and grade 0 (denoted by a 'E' in
the part number), which represent maximum ambient
operating temperatures of 125°C and 150°C
respectively. The TL43xLI-Q1 is characterized for
operation from –40°C to 125°C for grade 1, and
–40°C to 150°C for grade 0, and its low output drift
versus temperature ensures good stability over the
entire temperature range.
Device Information(1)
PART NUMBER
TL43xLI-Q1
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.
TL431LI-Q1
TL432LI-Q1
SNVSBA4A – 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................................................. 12
9.4 Device Functional Modes........................................ 12
10 Applications and Implementation...................... 13
10.1 Application Information.......................................... 13
10.2 Typical Applications .............................................. 13
10.3 System Examples ................................................. 22
11 Power Supply Recommendations ..................... 25
12 Layout................................................................... 25
12.1 Layout Guidelines ................................................. 25
12.2 Layout Example .................................................... 25
13 Device and Documentation Support ................. 26
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 ................................................................
26
26
26
26
26
27
27
27
14 Mechanical, Packaging, and Orderable
Information ........................................................... 27
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)
TL431LI-Q1
TL432LI-Q1
A: 1% B: 0.5%
Q: -40°C to 125°C
E: -40°C to 150°C
6 Pin Configuration and Functions
TL431LI-Q1 DBZ Package
3-Pin SOT-23
Top View
CATHODE
TL432LI-Q1 DBZ Package
3-Pin SOT-23
Top View
1
3
REF
ANODE
1
3
ANODE
2
REF
CATHODE
2
Pin Functions
PIN NUMBER
NAME
TL431LI-Q1
TL432LI-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
VKA
Cathode Voltage
IKA
Continuous Cathode Current Range
TA
Operating Free-Air Temperature (1)
(1)
MIN
MAX
UNIT
VREF
36
V
0.6
15
mA
TL43xLIxQ
–40
125
C
TL43xLIxE
–40
150
C
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. Please see the Semiconductor and IC
Package Thermal Metrics Application Report for more information.
7.4 Thermal Information
TL43xLI
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-boardthermal resistance
104.7
C/W
ψJT
Junction-to-top characterization resistance
23.9
C/W
ψJB
Junction-to-board characterization resistance
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
Vref
Reference Voltage
VI(dev)
Deviation of reference
input voltage over full
temperature range (1)
See Figure 14
VKA = Vref, IKA = 1 mA
ΔVref /
ΔVKA
Ratio of change in
reference voltage to the
change in cathode
voltage
See Figure 15
IKA = 1 mA
Iref
Reference Input Current See Figure 15
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
See Figure 14
TEST CONDITIONS
(2)
VKA = Vref, IKA = 1 mA
MIN
TYP MAX
UNIT
TL43xLIAx devices
2470 2495 2520
mV
TL43xLIBx devices
2483 2495 2507
mV
TL43xLIxQ devices
10
27
mV
TL43xLIxE devices
14
34
mV
–1.4
–2.7
mV/V
–1
–2
mV/V
IKA = 1 mA, R1 = 10kΩ, R2 = ∞
0.2
0.4
µA
See Figure 15
IKA = 1 mA, R1 = 10kΩ, R2 = ∞
0.1
0.3
µA
See Figure 14
VKA = Vref
0.6
mA
See Figure 16
VKA = 36 V, Vref = 0
0.1
1
µA
See Figure 14
VKA = Vref, IKA = 1 mA to 15 mA
0.3
0.75
Ω
ΔVKA = 10 V - Vref
ΔVKA = 36 V - 10 V
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 VKA, 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
Vka = Vref
2515 IKA = 1 mA
2510
2505
2500
2495
2490
2485
0.4
0.3
0.2
0.1
2480
2475
-50
0
-50
-25 0
25 50 75 100 125 150
TA - Free-Air Temperature - °C
Book
Figure 1. Reference Voltage versus Free-Air Temperature
Figure 2. Reference Current versus Free-Air Temperature
0.064
12
9
6
3
0
VKA = 36 V
0.056 VREF = 0 V
0.048
0.04
0.032
0.024
0.016
0.008
0
-50
-3
0
0.5
1
1.5
2
2.5
VKA - Cathode Voltage -V
3
D003
Figure 4. Off-State Cathode Current
versus Free-Air Temperature
VKA = 3 V to 36 V
-0.4
'Vref / 'VKA = mV/V
-0.45
-0.5
-0.55
-0.6
-0.65
-0.7
-0.75
-0.8
-50
-25
0
25 50 75 100 125 150
Temperature (°C)
D006
Figure 5. Ratio of Delta Reference Voltage to Delta Cathode
Voltage versus Free-Air Temperature
AV - Small-Signal Voltage Amplification - dB
Figure 3. Cathode Current versus Cathode Voltage
-0.35
-25 0
25 50 75 100 125 150
TA - Free-Air Temperature - °C
75
200
Gain
Phase
60
160
45
120
30
80
15
40
0
100
1k
10k
100k
f - Frequency - Hz
1M
Phase - Degrees
VKA = Vref
TA = 25°C
Ioff - Off-State Cathode Current - PA
IKA - Cathode Current - mA
15
6
-25 0
25 50 75 100 125 150
TA - Free-Air Temperature - °C
0
10M
Gain
Figure 6. Small-Signal Voltage Amplification
versus Frequency
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Typical Characteristics (continued)
IKA = 10 mA
TA = 25°C
Output
IKA
15 kΩ
232 Ω
9 µF
+
−
8.25 kΩ
|ZKA| - Reference Impedance - Ohms
100
10
5
3
2
1
0.5
0.3
0.2
0.1
1k
GND
Figure 7. Test Circuit for Voltage Amplification
IKA = 1 mA
50 T = 25°C
A
30
20
10k
100k
f - Frequency - Hz
1M
Figure 8. Reference Impedance versus Frequency
6
1 kΩ
Output
Input and Output Voltage - V
Input
IKA
50 Ω
−
+
GND
TA = 25qC
5
4
3
Output
2
1
0
-1
1
2
3
4
t - Time - Ps
5
6
7
puls
Figure 10. Pulse Response
Figure 9. Test Circuit for Reference Impedance
15
220 Ω
50 Ω
GND
IKA - Cathode Current - mA
Output
Pulse
Generator
f = 100 kHz
0
12
Stable Region
9
6
3
0
0.001
Figure 11. Test Circuit for Pulse Response
A VKA = Vref
B VKA = 5 V
C VKA = 10 V
0.01
0.1
1
CL - Load Capacitance - µF
10
Copy
TL43
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 12. Stability Boundary Conditions for All TL431LI-Q1,
TL432LI-Q1 Devices
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Typical Characteristics (continued)
150 Ω
IKA
+
VBATT
CL
−
TEST CIRCUIT FOR CURVE A
IKA
R1 = 10 kΩ
150 Ω
CL
+
R2
VBATT
−
TEST CIRCUIT FOR CURVES B, C, AND D
Figure 13. Test Circuits for Stability Boundary Conditions
8
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8 Parameter Measurement Information
VKA
Input
IKA
Vref
Figure 14. 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 15. Test Circuit for VKA > Vref
Input
VKA
Ioff
Figure 16. 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 15), the total dynamic impedance of the circuit is given by
R1 ·
§
ZKA ¨ 1
¸
© R2 ¹ .
ZKA
Itest
P/
IKA (mA)
The VKA of the TL431LI-Q1 can be affected by the dynamic impedance. The TL431LI-Q1 test current Itest for VKA
is specified in the Electrical Characteristics. Any deviation from Itest can cause deviation on the output VKA.
Figure 17 shows the effect of the dynamic impedance on the VKA.
IKA
IKA(min)
0
VKA (V)
Ps
Figure 17. 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. TL43xLI-Q1 is used in conjunction with its key components to
behave as a single voltage reference, error amplifier, voltage clamp or comparator with integrated reference.
TL43xLI-Q1 can be operated and adjusted to cathode voltages from 2.495 V to 36 V, making this part optimal for
a wide range of end equipments in industrial, auto, telecom and computing. In order for this device to behave as
a shunt regulator or error amplifier, >0.6mA (Imin(max)) 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% (denoted by B), and
1% (denoted by A). TL431LI-Q1 and TL432LI-Q1 are both functionally the same, but have different pinout
options.
9.2 Functional Block Diagram
CATHODE
+
REF
_
Vref
ANODE
Figure 18. Equivalent Schematic
CATHODE
REF
ANODE
Figure 19. Detailed Schematic
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9.3 Feature Description
TL43xLI-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 19. 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 (≥ 2.495 V) and cathode current (IKA), TL43xLI-Q1 forces the
reference pin to 2.495 V. However, the reference pin can not 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 in order
operate properly.
When feedback is applied from the Cathode and Reference pins, TL43xLI-Q1 behaves as a Zener diode (refer to
Figure 23 for a circuit example), 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 TL43xLI-Q1 enough gain.
Unlike many linear regulators, TL43xLI-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 12 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 TL43xLI-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, TL43xLI-Q1
has the characteristics shown in Figure 18. With such high gain in this configuration, TL43xLI-Q1 is typically used
as a comparator. Since the reference is integrated, TL43xLI-Q1 is the preferred choice when users are trying to
monitor a certain level of a single signal. Refer to the Using the TL431 as a Voltage Comparator Application
Report for more details on open loop comparator applications on the TL431LI-Q1.
9.4.2 Closed Loop
When the cathode/output voltage or current of TL43xLI-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 TL43xLI-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 through resistive or direct feedback.
12
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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 can not
characterize in detail. The linked application notes help the designer make the best choices when using this part.
Designing with the Improved TL431LI Application Note provides a deeper understanding of this accuracy of the
device in a flyback optocoupler application. 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 Typical Applications
10.2.1 Comparator With Integrated Reference
Vsup
Rsup
Vout
CATHODE
R1
VIN
RIN
REF
VL
+
R2
2.5V
ANODE
Figure 20. Comparator Application Schematic
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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 TL43xLI-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 20, TL43xLI-Q1 behaves as a comparator, comparing the VREF pin voltage
to the internal virtual reference voltage. When provided a proper cathode current (IK), TL43xLI-Q1 has enough
open loop gain to provide a quick response. This can be seen in Figure 21 where the RSUP = 10 kΩ (IKA = 500
µA) situation responds much slower than RSUP = 1 kΩ (IKA = 5 mA). With the TL43xLI-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 2.495 V ±(0.5% or 1.0%), depending on which version is being used. The more
overdrive voltage provided, the faster the TL43xLI-Q1 responds.
For applications where TL43xLI-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.
14
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10.2.3.2 Output Voltage and Logic Input Level
For TL43xLI-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 21, the output low level voltage of the TL43xLI 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 TL43xLI is equal to VSUP due to TL43xLI-Q1 being open-collector. If VSUP is much
higher than the maximum input voltage tolerance of the maximum 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 20)
is much greater than RSUP to not interfere with the ability of the TL43xLI to pull close to VSUP when turning off.
10.2.3.2.1 Input Resistance
TL43xLI-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 - IREFRIN. Because IREF can be as high as 0.4 µA, it is recommended 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 21. Output Response With Various Cathode Currents
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10.2.5 Precision LED Lighting Current Sink Regulator
VCC
R1 = I
OUT
IKA
hFE
IOUT =
VCC
VREF
RS
VCC
IOUT
R1
TL431LI-Q1
RS
GND
Figure 22. 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)
100mA
Cathode Current (Ik)
5 mA
10.2.5.2 Detailed Design Procedure
When using the TL43xLI-Q1 as a constant current sink, determine the following:
• Output current range
• Output current accuracy
• Power consumption for TL43xLI-Q1
10.2.5.2.1 Basic Operation
In the configuration shown, TL43xLI-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, TL43xLI-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.
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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 2.495 V. When choosing the sense resistor RS, it needs to generate 2.495 V for the
TL43xLI-Q1 when IO reaches the target current. If the overhead voltage of 2.495 V is not acceptable, consider
lower voltage reference devices such as the TLV43x-Q1 or TLVH43x-Q1.
The output current accuracy is determined by both the accuracy of TL43xLI-Q1 chosen, as well as the accuracy
of the sense resistor RS. The internal virtual reference voltage of TL43xLI-Q1 is within the range of 2.495 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 TL43xLI-Q1 and RS. Refer to the Electrical Characteristics of these
parameters.
10.2.5.2.2 Power Consumption
For TL43xLI-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 TL43xLI-Q1.
For TL43xLI, the minimum operating current is 0.6 mA and with margin consideration, most of the designs set
this current to be higher than 0.6 mA. To achieve lower power consumption, consider devices such as the
ATL43x-Q1 and ATL43xLI-Q1.
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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%
TL431LI-Q1
ANODE
CL
Figure 23. 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
2.495 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 TL43xLI-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 23, 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 23. The cathode voltage can be more accurate determined by taking in to account the
cathode current:
Vo=(1+R1/R2)VREF-IREFR1
(1)
For this equation to be valid, TL43xLI-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), TL43xLI-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 TL43xLI-Q1 is stable with no capacitive load, the device that receives the output voltage of the shunt
regulator can presents a capacitive load that is within the TL43xLI-Q1 region of stability, shown in Figure 12.
Also, designers can use capacitive loads to improve the transient response or for power supply decoupling.
When using additional capacitance between Cathode and Anode, refer to Figure 12. Also, the Understanding
Stability Boundary Conditions Charts in TL431, TL432 Data Sheet Application Note provides a deeper
understanding of this devices stability characteristics 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 24, TL43xLI-Q1 has a fast response up to approximately 2 V and then slowly charges to the
programmed value. This is due to the compensation capacitance (shown in Figure 19) the TL43xLI-Q1 has to
meet the stability criteria. Despite the secondary delay, TL43xLI-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 24. TL43xLI-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
TL431LI-Q1
GND
Figure 25. Isolated Flyback with Optocoupler
10.2.7.1 Design Requirements
The TL431LI-Q1 is used in the feedback network on the secondary side in an isolated flyback with optocoupler
design. Figure 25 shows the simplified flyback converter with the TL431LI-Q1. For this design example, use the
parameters in Table 4 as the input parameters. 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 the Compensation Design with TL431 for UCC28600 Application Report.
Table 4. Design Parameters
DESIGN PARAMETER
EXAMPLE VALUE
Voltage Output
15 V
Secondary Side Feedback Loop Accuracy
< 3%
10.2.7.2 Detailed Design Procedure
The goal of this design is to design a high accuracy feedback network to meet 3% VOUT accuracy requirements
over the full temperature range. To meet the design requirements, the total secondary side feedback loop error
has to be below 3%. To meet these requirements, it is necessary to take full advantage of the improved
temperature drift, Iref(min), and II(dev) of the TL431LI-Q1.
VOUT
Rs
Error|Iref
R1 = 40.2 NŸ
IREF
TL431LI-Q1
Error|Vref
R2 = 8.06 NŸ
Figure 26. Feedback Quiescent Current
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10.2.7.2.1 TL431 Feedback Loop Error Calculation
Figure 26 shows the simplified version of the feedback network. The accuracy of the output voltage is dependent
on the regulation voltage accuracy of the TL431LI-Q1. A simplified VOUT can be seen in Equation 2, but this
equation does not include errors that deviates the output.
R1
VOUT Vref u (1
) R1u (Iref )
R2
40.2k:
VOUT (2.495 V) u (1
) 40.2k: u (0.4 PA)
8.06k:
VOUT
14.955 V
(2)
The primary sources of error are the Error|Vref and Error|Iref. The Error|Vref primarily consists of the errors that
affect the internal bandgap voltage reference of the TL431LI-Q1. This consists of errors from the initial accuracy,
temperature drift, ratio of change in reference voltage to the change in cathode voltage, and dynamic impedance.
The benefit of the TL431LI-Q1 is its low temperature drift, VI(dev), which allows the Vref to be more accurate
across the full temperature range compared to typical TL431LI-Q1 devices. Equation 3 shows a simplified worst
case Vref with initial accuracy and temperature drift.
Vref (Error |Vref ) Vref u (1 Initial Accuracy) VI(dev) ...
Vref (Error |Vref )
2.495 V u (1 0.5%) 17mV ...
Vref (Error |Vref ) | 2.524 V
(3)
The Error|Iref in Figure 26 is dependent on the Iref and II(dev) along with R1. The TL431LI-Q1 has improved Iref and
II(dev) which allows the values of the resistor R1 to be increased to save power. Typically optocoupler feedback
design requires the Iref to be taken into account when doing VOUT calculations but the error comes from the
deviation from the maximum to typical value of Iref. In addition to this, the II(dev) is the temperature deviation on
the Iref current which affects the overall reference current into the TL431LI-Q1. Equation 4 shows the VOUT of the
TL431LI-Q1 for Figure 26, which includes the improved Iref and II(dev). The VOUT equation assumes that the
resistors R1 and R2 have a 0.5% accuracy tolerance.
R1
VOUT (Error |Iref ) Vref (Error |Vref ) u (1
) R1 u (Iref II(dev) )
R2
40.2k: u (1 0.5%)
VOUT (Error |Iref ) (2.495 V u (1 0.5%) 0.017 V) u (1
)
8.06k: u (1 0.5%)
40.2k: u (1 0.5%) u (0.4 PA 0.3 PA)
VOUT 15.270 V
(4)
Comparing the calculated VOUT without and without error, the expected worst case max error is 2.1% which
meets the 3% error target.
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10.3 System Examples
VI(BATT)
R
(see Note A)
2N222
2N222
30 Ω
4.7 kΩ
0.01 µF
TL431LI-Q1
VO
R2
0.1%
R1
0.1%
R1 ö
æ
VO = ç 1 +
÷ Vref
R2 ø
è
R should provide cathode current ≥0.6 mA to the TL431LI-Q1 at minimum V(BATT).
Figure 27. Precision High-Current Series Regulator
VI(BATT)
IN
uA7805
OUT
Common
VO
R1
TL431LI-Q1
(
(
VO = 1 + R1 Vref
R2
Minimum V
V + 5V
O = ref
R2
Figure 28. Output Control of a Three-Terminal Fixed Regulator
VO
VI(BATT)
(
(
VO = 1 + R1 Vref
R2
R1
TL431LI-Q1
R2
Figure 29. High-Current Shunt Regulator
VI(BATT)
VO
R1
TL431LI-Q1
R2
C
(see Note A)
Refer to the stability boundary conditions in Figure 12 to determine allowable values for C.
Figure 30. Crowbar Circuit
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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%
TL431LI-Q1
243 Ω
0.1%
Figure 31. Precision 5-V, 1.5-A Regulator
VI(BATT)
VO ≈5 V
Rb
(see Note A)
27.4 kΩ
0.1%
TL431LI-Q1
27.4 kΩ
0.1%
Rb should provide cathode current ≥0.6 mA to the TL431LI-Q1.
Figure 32. Efficient 5-V Low-Dropout (LDO) Regulator Configuration
12 V
VCC
6.8 kΩ
5V
10 kΩ
−
10 kΩ
0.1%
TL431LI-Q1
10 kΩ
0.1%
+
X
Not
Used
TL598
Feedback
Figure 33. 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
TL431LI-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 ≥0.6 mA to the TL431LI-Q1 at the
available VI(BATT).
Figure 34. Voltage Monitor
650 12 V
2 k
R
TL431LI-Q1
On
Off
C
Delay = R × C × ln
12 V
12 V – Vref
Figure 35. Delay Timer
RCL
0.1%
VI(BATT)
IO
Iout =
R1
R1 =
TL431LI-Q1
V ref
+ IKA
R CL
V I(BATT)
I
O
h FE
+ IKA
Figure 36. Precision Current Limiter
VI(BATT)
IO
IO =
TL431LI-Q1
Vref
RS
RS
0.1%
Figure 37. Precision Constant-Current Sink
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11 Power Supply Recommendations
When using TL43xLI-Q1 as a Linear Regulator to supply a load, designers typically use a bypass capacitor on
the output/cathode pin. When doing this, be sure that the capacitance is within the stability criteria shown in
Figure 12.
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, as not to exceed the 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 TL43xLI-Q1, these currents are low.
12.2 Layout Example
TL432LI-Q1 - DBZ
(TOP VIEW)
Rref
Vin
REF
1
Rsup
Vsup
ANODE
3
CATHODE
2
GND
CL
GND
Figure 38. 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 TL43xLI-Q1 family. More details and
possible orderable combinations are located in the Package Option Addendum.
TL431LI X X XXX X XX
Product
1: TL431LI
2: TL432LI*
*(Cathode and REF
pins are switched)
Initial
Operating Free-Air
Accuracy
Temperature
B: 0.5%
A: 1%
Q: -40°C to 125°C
E: -40°C to 150°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, Understanding Stability Boundary Conditions Charts in TL431, TL432 Data Sheet
• Texas Instruments, Setting the Shunt Voltage on an Adjustable Shunt Regulator
• Texas Instruments, Designing With the Improved TL431LI
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 5. Related Links
PARTS
PRODUCT FOLDER
ORDER NOW
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
TL431LI-Q1
Click here
Click here
Click here
Click here
Click here
TL432LI-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.
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13.6 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
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)
TL431LIAEDBZRQ1
ACTIVE
SOT-23
DBZ
3
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
23CP
TL431LIAQDBZRQ1
ACTIVE
SOT-23
DBZ
3
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
22TP
TL431LIBEDBZRQ1
ACTIVE
SOT-23
DBZ
3
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
23DP
TL431LIBQDBZRQ1
ACTIVE
SOT-23
DBZ
3
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
22UP
TL432LIAEDBZRQ1
ACTIVE
SOT-23
DBZ
3
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
23EP
TL432LIAQDBZRQ1
ACTIVE
SOT-23
DBZ
3
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
22VP
TL432LIBEDBZRQ1
ACTIVE
SOT-23
DBZ
3
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
23FP
TL432LIBQDBZRQ1
ACTIVE
SOT-23
DBZ
3
3000
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 125
22WP
(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.
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
10-Jan-2020
(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
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 TL431LI-Q1, TL432LI-Q1 :
• Catalog: TL431LI, TL432LI
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)
TL431LIAEDBZRQ1
SOT-23
DBZ
3
3000
178.0
9.0
TL431LIAQDBZRQ1
SOT-23
DBZ
3
3000
178.0
TL431LIBEDBZRQ1
SOT-23
DBZ
3
3000
178.0
TL431LIBQDBZRQ1
SOT-23
DBZ
3
3000
TL432LIAEDBZRQ1
SOT-23
DBZ
3
TL432LIAQDBZRQ1
SOT-23
DBZ
TL432LIBEDBZRQ1
SOT-23
DBZ
TL432LIBQDBZRQ1
SOT-23
DBZ
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
178.0
9.0
3.15
2.77
1.22
4.0
8.0
Q3
3000
178.0
9.0
3.15
2.77
1.22
4.0
8.0
Q3
3
3000
178.0
9.0
3.15
2.77
1.22
4.0
8.0
Q3
3
3000
178.0
9.0
3.15
2.77
1.22
4.0
8.0
Q3
3
3000
178.0
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)
TL431LIAEDBZRQ1
SOT-23
DBZ
3
3000
180.0
180.0
18.0
TL431LIAQDBZRQ1
SOT-23
DBZ
3
3000
180.0
180.0
18.0
TL431LIBEDBZRQ1
SOT-23
DBZ
3
3000
180.0
180.0
18.0
TL431LIBQDBZRQ1
SOT-23
DBZ
3
3000
180.0
180.0
18.0
TL432LIAEDBZRQ1
SOT-23
DBZ
3
3000
180.0
180.0
18.0
TL432LIAQDBZRQ1
SOT-23
DBZ
3
3000
180.0
180.0
18.0
TL432LIBEDBZRQ1
SOT-23
DBZ
3
3000
180.0
180.0
18.0
TL432LIBQDBZRQ1
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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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
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standards, and any other safety, security, or other requirements. These resources are subject to change without notice. TI grants you
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