Sample &
Buy
Support &
Community
Product
Folder
Tools &
Software
Technical
Documents
LP3961, LP3964
SNVS056J –MAY 2000–REVISED JUNE 2015
LP396x 800-mA Fast Ultra-Low-Dropout Linear Regulators
1 Features
3 Description
The LP396x series of fast ultra-low-dropout linear
1
•
•
•
•
•
•
•
•
•
Input Supply Voltage: 2.5 V to 7 V
Ultra-Low Dropout Voltage
regulators operate from a 2.5-V to 7-V input supply. A
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 LP3961 and LP3964 are developed
on a CMOS process which allows low quiescent
current operation independent of output load current,
as well as operation under extremely low dropout
conditions.
Low Ground Pin Current
Load Regulation of 0.02%
15-µA Quiescent Current in Shutdown Mode
Specified Output Current of 0.8-A DC
Output Voltage Accuracy ±1.5%
ERROR Flag Indicates Output Status (LP3961)
Sense Option Improves Better Load Regulation
(LP3964)
Dropout Voltage: Ultra-low dropout voltage; typically
24 mV at 80-mA load current and 240 mV at 800-mA
load current.
•
•
•
Extremely Low Output Capacitor Requirements
Overtemperature and Overcurrent Protection
−40°C to 125°C Junction Temperature Range
Ground Pin Current: Typically 4 mA at 800-mA load
current.
ERROR Flag: ERROR flag goes low when the output
voltage drops 10% below nominal value (for LP3961).
2 Applications
•
•
•
•
•
•
•
•
Microprocessor Power Supplies
GTL, GTL+, BTL, and SSTL Bus Terminators
Power Supplies for DSPs
SCSI Terminator
SENSE: SENSE pin improves regulation at remote
loads (for LP3964).
Precision Output Voltage: Multiple output voltage
options are available ranging from 1.2 V to 5 V and
adjustable (LP3964), with a specified accuracy of
±1.5% at room temperature, and ±3% over all
conditions (varying line, load, and temperature).
Post Regulators
High-Efficiency Linear Regulators
Battery Chargers
Other Battery-Powered Applications
Device Information(1)
PART NUMBER
LP3961
PACKAGE
SOT-223 (5)
TO-263 (5)
TO-220 (5)
BODY SIZE (NOM)
6.50 mm × 3.56 mm
10.16 mm × 8.42 mm
14.986 mm × 10.16 mm
LP3964
LP3964
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
space
LP3964 Typical Application Circuits
LP3961 Typical Application Circuit
A. *SD and ERROR pins must be pulled high
through a 10-kΩ pullup resistor. Connect
the ERROR pin to ground if this function is
not used.
*See note A on LP3961 Typical Application
Circuit.
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.