National Semiconductor LP3872, LP3875 Technical data
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LP3872/LP3875
1.5A Fast Ultra Low Dropout Linear Regulators
LP3872/LP3875 1.5A Fast Ultra Low Dropout Linear Regulators
July 2005
General Description
The LP3872/LP3875 series of fast ultra low-dropout linear
regulators operate from a +2.5V to +7.0V input supply. Wide
range of preset output voltage options are available. These
ultra low dropout linear regulators respond very quickly to
step changes in load, which makes them suitable for low
voltage microprocessor applications. The LP3872/LP3875
are developed on a CMOS process which allows low quiescent current operation independent of output load current.
This CMOS process also allows the LP3872/LP3875 to operate under extremely low dropout conditions.
Dropout Voltage: Ultra low dropout voltage; typically 38mV
at 150mA load current and 380mV at 1.5A load current.
Ground Pin Current: Typically 6mA at 1.5A load current.
Shutdown Mode: Typically 10nA quiescent current when
the shutdown pin is pulled low.
Error Flag: Error flag goes low when the output voltage
drops 10% below nominal value.
SENSE: Sense pin improves regulation at remote loads.
Precision Output Voltage: Multiple output voltage options
are available ranging from 1.8V to 5.0V with a guaranteed
accuracy of
conditions (varying line, load, and temperature).
±
1.5% at room temperature, and±3.0% over all
Typical Application Circuits
Features
n Ultra low dropout voltage
n Low ground pin current
n Load regulation of 0.06%
n 10nA quiescent current in shutdown mode
n Guaranteed output current of 1.5A DC
n Available in TO-263, TO-220 and SOT-223 packages
n Output voltage accuracy
n Error flag indicates output status
n Sense option improves load regulation
n Minimum output capacitor requirements
n Overtemperature/overcurrent protection
n −40˚C to +125˚C junction temperature range
±
1.5%
Applications
n Microprocessor power supplies
n GTL, GTL+, BTL, and SSTL bus terminators
n Power supplies for DSPs
n SCSI terminator
n Post regulators
n High efficiency linear regulators
n Battery chargers
n Other battery powered applications
*SD and ERROR pins must be pulled high through a 10kΩ pull-up resistor. Connect the ERROR pin to ground if this function is not used. See application hints
for more information.
© 2005 National Semiconductor Corporation DS200633 www.national.com
20063301
Typical Application Circuits (Continued)
LP3872/LP3875
*SD must be pulled high through a 10kΩ pull-up resistor. See application hints for more information.
Connection Diagrams
20063305
Top View
TO220-5 Package
Bent, Staggered Leads
20063345
20063306
Top View
TO263-5 Package
Top View
20063386
SOT223-5 Package
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Pin Description for TO220-5 and TO263-5 Packages
#
Pin
Name Function Name Function
1SD
2V
IN
3 GND Ground GND Ground
4V
OUT
5 ERROR
LP3872 LP3875
Shutdown SD Shutdown
Input Supply V
Output Voltage V
IN
OUT
ERROR Flag SENSE Remote Sense Pin
Pin Description for SOT223-5 Package
#
Pin
Name Function Name Function
1SD
2V
3V
IN
OUT
4 ERROR
5 GND Ground GND Ground
LP3872 LP3875
Shutdown SD Shutdown
Input Supply V
Output Voltage V
IN
OUT
ERROR Flag SENSE Remote Sense Pin
LP3872/LP3875
Input Supply
Output Voltage
Input Supply
Output Voltage
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Ordering Information
LP3872/LP3875
Package Type Designator is "T" for TO220 package, "S" for TO263 package, and "MP" for SOT223-5 package.
TABLE 1. Package Marking and Ordering Information
Output
Voltage
5.0 LP3872EMP-5.0 1.5A, Error Flag
5.0 LP3872EMPX-5.0 1.5A, Error Flag SOT223-5 LHDB 2000 Units on Tape and
5.0 LP3872ES-5.0 1.5A, Error Flag
5.0 LP3872ESX-5.0 1.5A, Error Flag
3.3 LP3872EMP-3.3 1.5A, Error Flag
3.3 LP3872EMPX-3.3 1.5A, Error Flag SOT223-5 LHCB 2000 Units on Tape and
3.3 LP3872ES-3.3 1.5A, Error Flag
3.3 LP3872ESX-3.3 1.5A, Error Flag
2.5 LP3872EMP-2.5 1.5A, Error Flag
2.5 LP3872EMPX-2.5 1.5A, Error Flag SOT223-5 LHBB 2000 Units on Tape and
2.5 LP3872ES-2.5 1.5A, Error Flag
2.5 LP3872ESX-2.5 1.5A, Error Flag
1.8 LP3872ES-1.8 1.5A, Error Flag
1.8 LP3872ESX-1.8 1.5A, Error Flag
1.8 LP3872EMP-1.8 1.5A, Error Flag
1.8 LP3872EMPX-1.8 1.5A, Error Flag
5.0 LP3875EMP-5.0 1.5A, SENSE SOT223-5 LHRB 1000 Units on Tape and
5.0 LP3875EMPX-5.0 1.5A, SENSE SOT223-5 LHRB 2000 Units on Tape and
5.0 LP3875ES-5.0 1.5A, SENSE TO263-5 LP3875ES-5.0 Rail
5.0 LP3875ESX-5.0 1.5A, SENSE TO263-5 LP3875ES-5.0 Tape and Reel
3.3 LP3875EMP-3.3 1.5A, SENSE SOT223-5 LHPB 1000 Units on Tape and
Order Number
Description
(Current, Option)
Package Type Package Marking Supplied As:
SOT223-5 LHDB 1000 Units on Tape and
TO263-5 LP3872ES-5.0 Rail
TO263-5 LP3872ES-5.0 Tape and Reel
SOT223-5 LHCB 1000 Units on Tape and
TO263-5 LP3872ES-3.3 Rail
TO263-5 LP3872ES-3.3 Tape and Reel
SOT223-5 LHBB 1000 Units on Tape and
TO263-5 LP3872ES-2.5 Rail
TO263-5 LP3872ES-2.5 Tape and Reel
TO263-5 LP3872ES-1.8 Rail
TO263-5 LP3872ES-1.8 Tape and Reel
SOT223-5 LHAB 1000 Units on Tape and
SOT223-5 LHAB 2000 Units on Tape and
20063331
Reel
Reel
Reel
Reel
Reel
Reel
Reel
Reel
Reel
Reel
Reel
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Ordering Information (Continued)
TABLE 1. Package Marking and Ordering Information (Continued)
Output
Voltage
3.3 LP3875EMPX-3.3 1.5A, SENSE SOT223-5 LHPB 2000 Units on Tape and
3.3 LP3875ES-3.3 1.5A, SENSE TO263-5 LP3875ES-3.3 Rail
3.3 LP3875ESX-3.3 1.5A, SENSE TO263-5 LP3875ES-3.3 Tape and Reel
2.5 LP3875EMP-2.5 1.5A, SENSE SOT223-5 LHNB 1000 Units on Tape and
2.5 LP3875EMPX-2.5 1.5A, SENSE SOT223-5 LHNB 2000 Units on Tape and
2.5 LP3875ES-2.5 1.5A, SENSE TO263-5 LP3875ES-2.5 Rail
2.5 LP3875ESX-2.5 1.5A, SENSE TO263-5 LP3875ES-2.5 Tape and Reel
1.8 LP3875EMP-1.8 1.5A, SENSE SOT223-5 LHLB 1000 Units on Tape and
1.8 LP3875EMPX-1.8 1.5A, SENSE SOT223-5 LHLB
1.8 LP3875ES-1.8 1.5A, SENSE TO263-5 LP3875ES-1.8 Rail
1.8 LP3875ESX-1.8 1.5A, SENSE TO263-5 LP3875ES-1.8 Tape and Reel
5.0 LP3872ET-5.0 1.5A, Error Flag
3.3 LP3872ET-3.3 1.5A, Error Flag
2.5 LP3872ET-2.5 1.5A, Error Flag
1.8 LP3872ET-1.8 1.5A, Error Flag
5.0 LP3875ET-5.0 1.5A, SENSE TO220-5 LP3875ET-5.0 Rail
3.3 LP3875ET-3.3 1.5A, SENSE TO220-5 LP3875ET-3.3 Rail
2.5 LP3875ET-2.5 1.5A, SENSE TO220-5 LP3875ET-2.5 Rail
1.8 LP3875ET-1.8 1.5A, SENSE TO220-5 LP3875ET-1.8 Rail
Order Number
Description
(Current, Option)
Package Type Package Marking Supplied As:
Ree
Reel
Ree
Reel
TO220-5 LP3872ET-5.0 Rail
TO220-5 LP3872ET-3.3 Rail
TO220-5 LP3872ET-2.5 Rail
TO220-5 LP3872ET-1.8 Rail
LP3872/LP3875
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Block Diagrams
LP3872/LP3875
LP3872
20063303
LP3875
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20063329
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