National Semiconductor LP3852 Technical data
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LP3852/LP3855
1.5A Fast Response Ultra Low Dropout Linear
Regulators
LP3852/LP3855 1.5A Fast Response Ultra Low Dropout Linear Regulators
March 2004
General Description
The LP3852/LP3855 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 LP3852/LP3855
are developed on a CMOS process which allows low quiescent current operation independent of output load current.
This CMOS process also allows the LP3852/LP3855 to operate under extremely low dropout conditions.
Dropout Voltage: Ultra low dropout voltage; typically 24mV
at 150mA load current and 240mV at 1.5A load current.
Ground Pin Current: Typically 4mA 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 Stable with selected ceramic capacitors
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 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.
© 2004 National Semiconductor Corporation DS200310 www.national.com
20031001
Typical Application Circuits (Continued)
LP3852/LP3855
**SD must be pulled high through a 10kΩ pull-up resistor. See Application Hints for more information.
Connection Diagrams
20031005
Top View
TO220-5 Package
Bent, Staggered Leads
20031034
20031006
Top View
TO263-5 Package
Top View
20031096
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
LP3852 LP3855
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
LP3852 LP3855
Shutdown SD Shutdown
Input Supply V
Output Voltage V
IN
OUT
ERROR Flag SENSE Remote Sense Pin
LP3852/LP3855
Input Supply
Output Voltage
Input Supply
Output Voltage
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Ordering Information
LP3852/LP3855
Package Type Designator is "T" for TO220 package, and "S" for TO263 package.
TABLE 1. Package Marking and Ordering Information
Output
Voltage Order Number
5.0 LP3852EMP-5.0 1.5A, Error Flag
5.0 LP3852EMPX-5.0 1.5A, Error Flag SOT223-5 LHXB 2000 Units on
5.0 LP3852ES-5.0 1.5A, Error Flag
5.0 LP3852ESX-5.0 1.5A, Error Flag
3.3 LP3852EMP-3.3 1.5A, Error Flag
3.3 LP3852EMPX-3.3 1.5A, Error Flag SOT223-5 LHVB 2000 Units on
3.3 LP3852ES-3.3 1.5A, Error Flag
3.3 LP3852ESX-3.3 1.5A, Error Flag
2.5 LP3852EMP-2.5 1.5A, Error Flag
2.5 LP3852EMPX-2.5 1.5A, Error Flag SOT223-5 LHUB 2000 Units on
2.5 LP3852ES-2.5 1.5A, Error Flag
2.5 LP3852ESX-2.5 1.5A, Error Flag
1.8 LP3852ES-1.8 1.5A, Error Flag
1.8 LP3852ESX-1.8 1.5A, Error Flag
1.8 LP3852EMP-1.8 1.5A, Error Flag
1.8 LP3852EMPX-1.8 1.5A, Error Flag
5.0 LP3855EMP-5.0 1.5A, SENSE SOT223-5 LJ2B 1000 Units on
5.0 LP3855EMPX-5.0 1.5A, SENSE SOT223-5 LJ2B 2000 Units on
5.0 LP3855ES-5.0 1.5A, SENSE TO263-5 LP3855ES-5.0 Rail
5.0 LP3855ESX-5.0 1.5A, SENSE TO263-5 LP3855ES-5.0 Tape and Reel
3.3 LP3855EMP-3.3 1.5A, SENSE SOT223-5 LJ1B 1000 Units on
Description
(Current, Option)
Package
Type Package Marking Supplied As:
SOT223-5 LHXB 1000 Units on
TO263-5 LP3852ES-5.0 Rail
TO263-5 LP3852ES-5.0 Tape and Reel
SOT223-5 LHVB 1000 Units on
TO263-5 LP3852ES-3.3 Rail
TO263-5 LP3852ES-3.3 Tape and Reel
SOT223-5 LHUB 1000 Units on
TO263-5 LP3852ES-2.5 Rail
TO263-5 LP3852ES-2.5 Tape and Reel
TO263-5 LP3852ES-1.8 Rail
TO263-5 LP3852ES-1.8 Tape and Reel
SOT223-5 LHTB 1000 Units on
SOT223-5 LHTB 2000 Units on
20031031
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
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Ordering Information (Continued)
TABLE 1. Package Marking and Ordering Information (Continued)
Output
Voltage Order Number
3.3 LP3855EMPX-3.3 1.5A, SENSE SOT223-5 LJ1B 2000 Units on
3.3 LP3855ES-3.3 1.5A, SENSE TO263-5 LP3855ES-3.3 Rail
3.3 LP3855ESX-3.3 1.5A, SENSE TO263-5 LP3855ES-3.3 Tape and Reel
2.5 LP3855EMP-2.5 1.5A, SENSE SOT223-5 LHZB 1000 Units on
2.5 LP3855EMPX-2.5 1.5A, SENSE SOT223-5 LHZB 2000 Units on
2.5 LP3855ES-2.5 1.5A, SENSE TO263-5 LP3855ES-2.5 Rail
2.5 LP3855ESX-2.5 1.5A, SENSE TO263-5 LP3855ES-2.5 Tape and Reel
1.8 LP3855EMP-1.8 1.5A, SENSE SOT223-5 LHYB 1000 Units on
1.8 LP3855EMPX-1.8 1.5A, SENSE SOT223-5 LHYB
1.8 LP3855ES-1.8 1.5A, SENSE TO263-5 LP3855ES-1.8 Rail
1.8 LP3855ESX-1.8 1.5A, SENSE TO263-5 LP3855ES-1.8 Tape and Reel
5.0 LP3852ET-5.0 1.5A, Error Flag
3.3 LP3852ET-3.3 1.5A, Error Flag
2.5 LP3852ET-2.5 1.5A, Error Flag
1.8 LP3852ET-1.8 1.5A, Error Flag
5.0 LP3855ET-5.0 1.5A, SENSE TO220-5 LP3855ET-5.0 Rail
3.3 LP3855ET-3.3 1.5A, SENSE TO220-5 LP3855ET-3.3 Rail
2.5 LP3855ET-2.5 1.5A, SENSE TO220-5 LP3855ET-2.5 Rail
1.8 LP3855ET-1.8 1.5A, SENSE TO220-5 LP3855ET-1.8 Rail
Description
(Current, Option)
Package
Type Package Marking Supplied As:
Tape and Ree
Tape and Reel
Tape and Ree
Tape and Reel
TO220-5 LP3852ET-5.0 Rail
TO220-5 LP3852ET-3.3 Rail
TO220-5 LP3852ET-2.5 Rail
TO220-5 LP3852ET-1.8 Rail
LP3852/LP3855
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Block Diagrams
LP3852/LP3855
LP3852
20031003
LP3855
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