NSC LP3966ET-ADJ, LP3966ET-5.0, LP3966ET-3.3, LP3966ET-1.8, LP3966ESX-ADJ Datasheet
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LP3963/LP3966
3A Fast Ultra Low Dropout Linear Regulators
LP3963/LP3966 3A Fast Ultra Low Dropout Linear Regulators
April 2000
General Description
The LP3963/LP3966 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 LP3963/LP3966 are developed on a CMOS process which allows low quiescent
current operation independent of output load current.This
CMOS process also allows the LP3963/LP3966 to operate
under extremely low dropout conditions.
Dropout Voltage: Ultra low dropout voltage; typically 80mV
at 300mA load current and 800mV at 3A load current.
Ground Pin Current: Typically 6mA at 3A 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 LP3963).
SENSE: Sense pin improves regulation at remote loads.
(For LP3966)
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 0.06%
n 15µA quiescent current in shutdown mode
n Guaranteed output current of 3A DC
n Available in TO-263 and TO-220 packages
n Output voltage accuracy
n Error flag indicates output status (LP3963)
n Sense option improves better load regulation (LP3966)
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
DS101267-1
#
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 DS101267 www.national.com
Typical Application Circuits (Continued)
LP3963/LP3966
DS101267-34
#
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.
Block Diagram LP3963
DS101267-3
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Block Diagram LP3966
Block Diagram LP3966-ADJ
LP3963/LP3966
DS101267-29
Connection Diagrams
DS101267-35
DS101267-5
Top View
TO220-5 Package
Bent, Staggered Leads
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Connection Diagrams (Continued)
LP3963/LP3966
Top View
TO263-5 Package
Pin Description for TO220-5 and TO263-5 Packages
DS101267-6
#
Pin
Name Function Name Function
1SD
2V
IN
LP3963 LP3966
Shutdown SD Shutdown
Input Supply V
IN
3 GND Ground GND Ground
4V
OUT
5 ERROR
Output Voltage V
OUT
ERROR Flag SENSE/ADJ Remote Sense
Ordering Information
Input Supply
Output Voltage
Pin/Output Adjust
Pin
Package Type Designator is ″T″ for TO220 package, and ″S″ for TO263 package.
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DS101267-31
Ordering Information (Continued)
TABLE 1. Package Marking and Ordering Information
LP3963/LP3966
Output
Voltage
5.0 LP3963ES-5.0 3A, Error Flag
5.0 LP3963ESX-5.0 3A, Error Flag
3.3 LP3963ES-3.3 3A, Error Flag
3.3 LP3963ESX-3.3 3A, Error Flag
2.5 LP3963ES-2.5 3A, Error Flag
2.5 LP3963ESX-2.5 3A, Error Flag
1.8 LP3963ES-1.8 3A, Error Flag
1.8 LP3963ESX-1.8 3A, Error Flag
5.0 LP3966ES-5.0 3A, SENSE TO263-5 LP3966ES-5.0 Rail
5.0 LP3966ESX-5.0 3A, SENSE TO263-5 LP3966ESX-5.0 Tape and Reel
3.3 LP3966ES-3.3 3A, SENSE TO263-5 LP3966ES-3.3 Rail
3.3 LP3966ESX-3.3 3A, SENSE TO263-5 LP3966ES-3.3 Tape and Reel
2.5 LP3966ES-2.5 3A, SENSE TO263-5 LP3966ES-2.5 Rail
2.5 LP3966ESX-2.5 3A, SENSE TO263-5 LP3966ES-2.5 Tape and Reel
1.8 LP3966ES-1.8 3A, SENSE TO263-5 LP3966ES-1.8 Rail
1.8 LP3966ESX-1.8 3A, SENSE TO263-5 LP3966ES-1.8 Tape and Reel
ADJ LP3966ES-ADJ 3A, ADJ TO263-5 LP3966ES-ADJ Rail
ADJ LP3966ESX-ADJ 3A, ADJ TO263-5 LP3966ES-ADJ Tape and Reel
5.0 LP3963ET-5.0 3A, Error Flag
3.3 LP3963ET-3.3 3A, Error Flag
2.5 LP3963ET-2.5 3A, Error Flag
1.8 LP3963ET-1.8 3A, Error Flag
5.0 LP3966ET-5.0 3A, SENSE TO220-5 LP3966ET-5.0 Rail
3.3 LP3966ET-3.3 3A, SENSE TO220-5 LP3966ET-3.3 Rail
2.5 LP3966ET-2.5 3A, SENSE TO220-5 LP3966ET-2.5 Rail
1.8 LP3966ET-1.8 3A, SENSE TO220-5 LP3966ET-1.8 Rail
ADJ LP3966ET-ADJ 3A, ADJ TO220-5 LP3966ET-ADJ Rail
Order Number Description
(Current, Option)
Package
Type
TO263-5 LP3963ES-5.0 Rail
TO263-5 LP3963ESX-5.0 Tape and Reel
TO263-5 LP3963ES-3.3 Rail
TO263-5 LP3963ES-3.3 Tape and Reel
TO263-5 LP3963ES-2.5 Rail
TO263-5 LP3963ES-2.5 Tape and Reel
TO263-5 LP3963ES-1.8 Rail
TO263-5 LP3963ES-1.8 Tape and Reel
TO220-5 LP3963ET-5.0 Rail
TO220-5 LP3963ET-3.3 Rail
TO220-5 LP3963ET-2.5 Rail
TO220-5 LP3963ET-1.8 Rail
Package Marking Supplied As:
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