Low drop - Low supply voltage, Low ESR capacitor compatible

Low drop - Low supply voltage, Low ESR capacitor compatible
LD3980
Low drop - Low supply voltage
Low ESR capacitor compatible
Feature summary
■
Input voltage from 1.7 to 3.6V
■
Ultra low dropout voltage (130mV typ. at
300mA load)
■
Very low quiescent current (110µA typ. at no
load, 130µA max. at 300mA load; max 0.5µA in
OFF MODE)
■
Output voltage tolerance: +/- 1.0% @ 25°C, +/2.0% full temperature range
■
Guaranteed output current up to 300mA
■
Wide range of output voltage: 0.8V to 3.0V
■
Logic-controlled electronic shutdown
■
Compatible with ceramic capacitor CO = 1µF
■
Internal current and thermal limit
■
Temperature range: -40°C to 85°C
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The LD3980 provides up to 300mA, from 1.7V to
3.6V input voltage. It can deliver a guaranteed
300mA continuous load current with a low 100mV
dropout. It is stable with ceramic capacitor. The
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ultra low drop-voltage, low quiescent current and
low noise makes it suitable for low power
applications and in battery powered systems.
High power supply rejection is maintained down
to low input voltage levels common to battery
operated circuits. Shutdown Logic Control
function is available this means that when the
device is used as local regulator, it is possible to
put a part of the board in standby, decreasing the
total power consumption. The device also
includes a constant current limiting and thermal
overload protection. Typical applications are in
mobile phone, personal digital assistant (PDAs),
cordless phone and similar battery powered
wireless systems, portable information
appliances..
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Description
DFN6 (3x3)
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Block diagram
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December 2006
Rev. 1
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www.st.com
16
LD3980
Contents
1
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6
Detailed description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
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6.1
Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.2
Current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.3
Thermal overload protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.4
Power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.5
Output capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
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7
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
8
Order code
9
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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LD3980
Pin configuration
1
Pin configuration
Figure 1.
Pin connections
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Table 1.
Symbol
1
OUT
2, 3
NC
4
GND
5
SHDN
6
IN
Symbol
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Name and function
Output Voltage of the LDO
Not connected
Common ground.
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SHUTDOWN Input Voltage:
Active-Low Shutdown input. A logic Low reduces supply current to below 1µA.
Connect to IN or logic high for normal operation
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Input Voltage of the LDO
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Thermal data
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Pin description
Pin N°
Table 2.
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Parameter
Thermal resistance junction-ambient
Value
Unit
55
°C/W
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3/16
Maximum ratings
LD3980
2
Maximum ratings
Table 3.
Absolute maximum ratings
Symbol
Parameter
Unit
-0.3 to 4.6
V
VI
DC Input voltage
VO
DC Output voltage
-0.3 to VI +0.3
V
VSHDN
Shutdown input voltage
-0.3 to VI +0.3
V
VRESET
Reset output voltage
-0.3 to VI +0.3
V
mA
IO
Output current
Internally limited
PD
Power dissipation
Internally limited
TSTG
Storage temperature range
-65 to 150
TOP
Operating junction temperature range
-40 to 85
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Note:
mW
°C
°C
Absolute Maximum Ratings are those values beyond which damage to the device may
occur. Functional operation under these condition is not implied.
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Value
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LD3980
Typical application
3
Typical application
Figure 2.
Application circuit
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Electrical characteristics
LD3980
4
Electrical characteristics
Table 4.
Electrical characteristics (TJ = 25°C, VI = VO(NOM) +0.5V, CI = CO = 1µF, IO = 1mA,
VSHDN = VI, unless otherwise specified) (Note: 1)
Symbol
Parameter
Test conditions
Min.
Max.
Unit
1.7
3.6
V
IO = 300mA
-1.0
+1.0
TJ = -40° to 85°C
-2.0
+2.0
-0.15
VI
Operating input voltage
VO
VO Accuracy
∆VO
Line regulation
VI = VO + 0.5V to 3.6V, IO = 1mA
∆VO
Load regulation
VDROP
eN
%
0.01
+0.15
%/V
IO = 1mA to 300mA
0.2
0.3
%/mA
Dropout voltage (Note 2)
IO = 300mA, VO ≥ 1.8V
TJ = -40° to 85°C
130
150
mV
Output noise voltage
10Hz to 100KHz, IO = 10mA,
Supply voltage rejection
(Figure 7.)
SVR
Quiescent current
ON MODE: VSHDN=1.4V
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110.7
VI = VO(NOM)+0.5V±VRIPPLE
VRIPPLE = 0.1V, f = 1KHz, IO = 10mA
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µVRMS/VO
60
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VIN = VO(NOM)+0.5V±VRIPPLE
VRIPPLE = 0.1V, f=10KHz, IO = 10mA
dB
58
bs
IO=0mA
IQ
Typ.
90
IO=0mA, TJ = -40° to 85°C
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IO=0 to 300mA
105
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IO=0 to 300mA, TJ = -40° to 85°C
µA
130
Quiescent current
V input current
OFF MODE: VSHDN=GND I
0.15
ISC
Short circuit current
RL=0
650
mA
IO(PK)
Peak output current
VO ≥ VO(NOM) -5%
610
mA
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0.4
Shutdown input logic low
let
VSHDN
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TON
TSHDN
CO
Note:
6/16
Shutdown input logic high
0.5
VI = 1.6V to 3.6V TJ = -40° to 85°C
V
1.4
Shutdown input current
VSHDN=GND or VI
0.1
100
nA
Turn on time
Note 3
120
µs
Thermal shutdown
Note 4
140
°C
Capacitance
1
10
µF
ESR
10
5000
mΩ
Output capacitor
1
For VO(NOM) < 1.2V, VI=1.7V
2
Dropout voltage is the input-to-output voltage difference at which the output voltage is
100mV below its nominal value. This specification does not apply for output voltages below
1.7V.
3
Turn-on time is time measured between the enable input just exceeding VSHDN High Value
and the output voltage just reaching 95% of its nominal value
4
Typical thermal protection hysteresis is 15°C.
LD3980
Typical characteristics
5
Typical characteristics
Figure 3.
Output voltage vs temperature
Figure 4.
Output voltage vs input voltage
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Figure 5.
Inhibit voltage vs temperature
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Figure 6.
Dropout voltage vs temperature
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Figure 7.
S.V.R. vs frequency
Figure 8.
Stability value
O
VI=VO(NOM) +0.5V+VRIPPLE, IO=10mA CI =CO= 1µF
VI= from 1.76 to 3.6V, IO=from 1mA to 0.3A
7/16
Typical characteristics
Figure 9.
LD3980
Stability value
Figure 10. Load transient
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VI= from 1.76 to 3.6V, IO=from 1mA to 0.3A
VINH=VI, IO=10 to 300mA No CO,CI= 1µF, TRISE=TFALL=5µs
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Figure 11. Line transient
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VINH=VI, IO=1mA No CI, CO= 1µF, TRISE=TFALL=1µs
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LD3980
6
Detailed description
Detailed description
The device is a low-dropout, low quiescent current linear regulator designed primarily for
battery-powered applications. It supplies a regulated output voltage for load currents up to
300mA. The LD3980 consists of a precision bandgap, error amplifier, output p-channel
MOS. The 0.7V bandgap reference is connected to the error amplifier. The error amplifier
compares this reference to the feedback voltage and amplifies the difference. The MOSFET
driver reads the error signal and applies the appropriate drive to the P-channel pass
transistor. If the feedback voltage is lower than reference voltage, the pass transistor is
pulled lower, allowing more current to pass and increasing the output voltage. If the
feedback voltage is higher than the reference voltage, the pass transistor gate is driven
higher, allowing less current to pass the output. The output voltage is feedback through an
internal resistor voltage connected to OUT. Additional blocks include an output current
limiter, a thermal sensor and shutdown logic.
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6.1
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Shutdown
Drive SHDN low to place the LD3980 in shutdown mode for DFN versions.
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In shutdown mode, the pass transistor, control circuit, reference and all biases are turned
off, reducing the supply current to typically 0.5µA. Connecting SHDN to IN every block is in
normal operation.
6.2
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Current limit
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The device includes short-circuit protection. It includes a current limiter that controls the
pass transistor's gate voltage to limit the output current to about 600mA.
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6.3
Thermal overload protection
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The Thermal over load protection limits total power dissipation in the device. When the
junction temperature (TJ) exceeds +140°C, the thermal sensor sends a signal to the
shutdown logic, turning off the pass transistor and allowing the device to cool. The pass
transistor turns on again after the device's junction temperature typically cools by 15°C,
resulting in a pulsed output during continuous thermal overload conditions.
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6.4
Power dissipation
Maximum power dissipation of the LD3980 depends on the thermal resistance of the case
and circuit board, the temperature difference between the die junction and ambient air, and
the rate of air flow. The power dissipated by the device is:
PD = IO (VI - VO)
The maximum power dissipation is:
PMAX = (TJMAX - TA) / θ JA
Where: TJMAX = +150°C
9/16
Detailed description
LD3980
TA is the ambient temperature
θ JA thermal resistance.
The device's pins perform the dual function of providing an electrical connection as well as
channeling heat away from the die. Use wide circuit-board traces and large, solid copper
polygons to improve power dissipation. Using multiple vias to buried ground planes further
enhances thermal conductivity.
6.5
Output capacitance
The device is specifically designed to employ ceramic output capacitors as low as 1µF.
Ceramic capacitors below 10µF offer significant cost and space savings, along with high
frequency noise filtering. Higher values and other types of capacitor may be used, but their
equivalent series resistance should be maintained in the range of the table.
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LD3980
7
Package mechanical data
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a Lead-free second level interconnect. The category of
second level interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
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Package mechanical data
LD3980
DFN6 (3x3) MECHANICAL DATA
mm.
mils
DIM.
MIN.
TYP
MAX.
MIN.
TYP.
MAX.
A
0.80
1.00
31.5
39.4
A1
0
0.05
0.0
2.0
A2
0.65
0.75
25.6
29.5
A3
0.20
b
0.33
D
2.90
D2
1.92
E
2.90
E2
1.11
3.00
3.00
0.43
13.0
3.10
114.2
2.12
75.6
3.10
114.2
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1.31
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0.95
L
0.20
0.24
)-
L2
K
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0.45
L1
0.20
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7.9
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43.7
16.9
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118.1
Pr
118.1
83.5
122.0
51.6
37.4
7.9
0.13
122.0
17.7
9.4
5.1
7.9
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7387339A
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LD3980
Package mechanical data
Tape & Reel QFNxx/DFNxx (3x3) MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
MAX.
A
MIN.
TYP.
330
MAX.
13.2
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
0.504
0.519
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18.4
Ao
3.3
Bo
3.3
Ko
1.1
Po
4
P
8
0.724
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0.130
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0.130
0.043
so
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0.157
0.315
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Order code
LD3980
8
Order code
Table 5.
Order code
Part number
Output voltage (1)
LD3980PM08R
0.8 V
LD3980PM12R
1.2 V (2)
LD3980PM13R
1.3 V (2)
LD3980PM135R
1.35 V
LD3980PM15R
1.5 V (2)
LD3980PM18R
1.8 V
LD3980PM30R
3.0 V
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1. Other values of VO available on request
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2. Available on request
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LD3980
Revision history
9
Revision history
Table 6.
Revision history
Date
Revision
05-Dec-2006
1
Changes
First release.
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LD3980
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Please Read Carefully:
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Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void
any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any
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