NSC LP3965ET-ADJ, LP3965ET-5.0, LP3965ET-3.3, LP3965ET-2.5, LP3965ESX-ADJ Datasheet
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LP3962/LP3965
1.5A Fast Ultra Low Dropout Linear Regulators
LP3962/LP3965 1.5A Fast Ultra Low Dropout Linear Regulators
May 2000
General Description
The LP3962/LP3965 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 fast to step
changes in load which makes them suitable for low voltage
microprocessor applications. The LP3962/LP3965 are developed on a CMOS process which allows low quiescent
current operation independent of output load current. This
CMOS process also allows the LP3962/LP3965 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 5mA at 1.5A load current.
Shutdown Mode: Typically 15µA quiescent current when
the shutdown pin is pulled low.
Error Flag: Error flag goes low when the output voltage
drops 10% below nominal value (for LP3962).
SENSE: Sense pin improves regulation at remote loads.
(For LP3965)
Precision Output Voltage: Multiple output voltage options
are available ranging from 1.2V to 5.0V and adjustable, with
a guaranteed accuracy of
±
3.0% over all conditions ( varying line, load, and tempera-
ture).
±
1.5% at room temperature, and
Features
n Ultra low dropout voltage
n Low ground pin current
n Load regulation of 0.04%
n 15µA quiescent current in shutdown mode
n Guaranteed output current of 1.5A DC
n Available in SOT-223,TO-263 and TO-220 packages
n Output voltage accuracy
n Error flag indicates output status (LP3962)
n Sense option improves better load regulation (LP3965)
n Extremely low 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
Typical Application Circuits
DS101266-1
#
Minimum output capacitance is 10 µF to ensure stability over full load current range. More capacitance provides superior dynamic performance and additional
stability margin.
*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 applications section for more information.
© 2000 National Semiconductor Corporation DS101266 www.national.com
Typical Application Circuits (Continued)
LP3962/LP3965
#
Minimum output capacitance is 10 µF to ensure stability over full load current range. More capacitance provides superior dynamic performance and additional stability margin.
*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 applications section
for more information.
DS101266-34
Block Diagram LP3962
DS101266-3
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Block Diagram LP3965
Block Diagram LP3965-ADJ
LP3962/LP3965
DS101266-29
Connection Diagrams
DS101266-35
DS101266-4
Top View
SOT 223-5 Package
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Connection Diagrams (Continued)
LP3962/LP3965
DS101266-5
Top View
TO220-5 Package
Bent, Staggered Leads
DS101266-6
Top View
TO263-5 Package
Pin Description for SOT223-5 Package
#
Pin
Name Function Name Function
1SD
2V
3V
IN
OUT
4 ERROR
5 GND Ground GND Ground
LP3962 LP3965
Shutdown SD Shutdown
Input Supply V
Output Voltage V
IN
OUT
ERROR Flag SENSE/ADJ Remote Sense Pin
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
LP3962 LP3965
Shutdown SD Shutdown
Input Supply V
Output Voltage V
IN
OUT
ERROR Flag SENSE/ADJ Remote Sense Pin
Input Supply
Output Voltage
or Output Adjust Pin
Input Supply
Output Voltage
or Output Adjust Pin
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Ordering Information
Package Type Designator is ″MP″ for SOT223 package, ″T″ for TO220 package, and ″S″ for TO263 package.
TABLE 1. Package Marking and Ordering Information
LP3962/LP3965
DS101266-31
Output
Voltage
5.0 LP3962EMP-5.0 1.5A, Error Flag
5.0 LP3962EMPX-5.0 1.5A, Error Flag
3.3 LP3962EMP-3.3 1.5A, Error Flag
3.3 LP3962EMPX-3.3 1.5A, Error Flag
2.5 LP3962EMP-2.5 1.5A, Error Flag
2.5 LP3962EMPX-2.5 1.5A, Error Flag
1.8 LP3962EMP-1.8 1.5A, Error Flag
1.8 LP3962EMPX-1.8 1.5A, Error Flag
5.0 LP3965EMP-5.0 1.5A, SENSE SOT223-5 LBVB 1000 units on Tape
5.0 LP3965EMPX-5.0 1.5A, SENSE SOT223-5 LBVB 2000 units on Tape
3.3 LP3965EMP-3.3 1.5A, SENSE SOT223-5 LBNB 1000 units on Tape
3.3 LP3965EMPX-3.3 1.5A, SENSE SOT223-5 LBNB 2000 units on Tape
2.5 LP3965EMP-2.5 1.5A, SENSE SOT223-5 LBLB 1000 units on Tape
2.5 LP3965EMPX-2.5 1.5A, SENSE SOT223-5 LBLB 2000 units on Tape
1.8 LP3965EMP-1.8 1.5A, SENSE SOT223-5 LBKB 1000 units on Tape
1.8 LP3965EMPX-1.8 1.5A, SENSE SOT223-5 LBKB 2000 units on Tape
ADJ LP3965EMP-ADJ 1.5A, ADJ SOT223-5 LBRB 1000 units on Tape
Order Number Description
(Current, Option)
Package
Type
SOT223-5 LBTB 1000 units on Tape
SOT223-5 LBTB 2000 units on Tape
SOT223-5 LBEB 1000 units on Tape
SOT223-5 LBEB 2000 units on Tape
SOT223-5 LBDB 1000 units on Tape
SOT223-5 LBDB 2000 units on Tape
SOT223-5 LBCB 1000 units on Tape
SOT223-5 LBCB 2000 units on Tape
Package
Marking
Supplied As:
and Reel
and Reel
and Reel
and Reel
and Reel
and Reel
and Reel
and Reel
and Reel
and Reel
and Reel
and Reel
and Reel
and Reel
and Reel
and Reel
and Reel
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Ordering Information (Continued)
TABLE 1. Package Marking and Ordering Information (Continued)
Output
Voltage
LP3962/LP3965
ADJ LP3965EMPX-ADJ 1.5A, ADJ SOT223-5 LBRB 2000 units on Tape
5.0 LP3962ES-5.0 1.5A, Error Flag
5.0 LP3962ESX-5.0 1.5A, Error Flag
3.3 LP3962ES-3.3 1.5A, Error Flag
3.3 LP3962ESX-3.3 1.5A, Error Flag
2.5 LP3962ES-2.5 1.5A, Error Flag
2.5 LP3962ESX-2.5 1.5A, Error Flag
1.8 LP3962ES-1.8 1.5A, Error Flag
1.8 LP3962ESX-1.8 1.5A, Error Flag
5.0 LP3965ES-5.0 1.5A, SENSE TO263-5 LP3965ES-5.0 Rail
5.0 LP3965ESX-5.0 1.5A, SENSE TO263-5 LP3965ES-5.0 Tape and Reel
3.3 LP3965ES-3.3 1.5A, SENSE TO263-5 LP3965ES-3.3 Rail
3.3 LP3965ESX-3.3 1.5A, SENSE TO263-5 LP3965ES-3.3 Tape and Reel
2.5 LP3965ES-2.5 1.5A, SENSE TO263-5 LP3965ES-2.5 Rail
2.5 LP3965ESX-2.5 1.5A, SENSE TO263-5 LP3965ES-2.5 Tape and Reel
1.8 LP3965ES-1.8 1.5A, SENSE TO263-5 LP3965ES-1.8 Rail
1.8 LP3965ESX-1.8 1.5A, SENSE TO263-5 LP3965ES-1.8 Tape and Reel
ADJ LP3965ES-ADJ 1.5A, ADJ TO263-5 LP3965ES-ADJ Rail
ADJ LP3965ESX-ADJ 1.5A, ADJ TO263-5 LP3965ES-ADJ Tape and Reel
5.0 LP3962ET-5.0 1.5A, Error Flag
3.3 LP3962ET-3.3 1.5A, Error Flag
2.5 LP3962ET-2.5 1.5A, Error Flag
1.8 LP3962ET-1.8 1.5A, Error Flag
5.0 LP3965ET-5.0 1.5A, SENSE TO220-5 LP3965ET-5.0 Rail
3.3 LP3965ET-3.3 1.5A, SENSE TO220-5 LP3965ET-3.3 Rail
2.5 LP3965ET-2.5 1.5A, SENSE TO220-5 LP3965ET-2.5 Rail
1.8 LP3965ET-1.8 1.5A, SENSE TO220-5 LP3965ET-1.8 Rail
ADJ LP3965ET-ADJ 1.5A, ADJ TO220-5 LP3965ET-ADJ Rail
Order Number Description
(Current, Option)
Package
Type
TO263-5 LP3962ES-5.0 Rail
TO263-5 LP3962ESX-5.0 Tape and Reel
TO263-5 LP3962ES-3.3 Rail
TO263-5 LP3962ES-3.3 Tape and Reel
TO263-5 LP3962ES-2.5 Rail
TO263-5 LP3962ES-2.5 Tape and Reel
TO263-5 LP3962ES-1.8 Rail
TO263-5 LP3962ES-1.8 Tape and Reel
TO220-5 LP3962ET-5.0 Rail
TO220-5 LP3962ET-3.3 Rail
TO220-5 LP3962ET-2.5 Rail
TO220-5 LP3962ET-1.8 Rail
Package
Marking
and Reel
Supplied As:
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