LP3963 Datasheet, PDF (1/25 Pages) National Semiconductor (TI) – 3A Fast Ultra Low Dropout Linear Regulators

LP3963, LP3966
www.ti.com
SNVS067H – APRIL 2000 – REVISED APRIL 2013
LP3963/LP3966 3A Fast Ultra Low Dropout Linear Regulators
Check for Samples: LP3963, LP3966
FEATURES
1
•2 Ultra Low Dropout Voltage
• Low Ground Pin Current
• Load Regulation of 0.06%
• 15µA Quiescent Current in Shutdown Mode
• Specified Output Current of 3A DC
• Available in DDPAK/TO-263 and TO-220
Packages
• Output Voltage Accuracy ± 1.5%
• Error Flag Indicates Output Status (LP3963)
• Sense Option Improves Load Regulation
(LP3966)
• Minimum Output Capacitor Requirements
• Overtemperature/Overcurrent Protection
• −40°C to +125°C Junction Temperature Range
APPLICATIONS
• Microprocessor Power Supplies
• GTL, GTL+, BTL, and SSTL Bus Terminators
• Power Supplies for DSPs
• SCSI Terminator
• Post Regulators
• High Efficiency Linear Regulators
• Battery Chargers
• Other Battery Powered Applications
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 quickly 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 (LP3966), with a specified accuracy of
±1.5% at room temperature, and ±3.0% over all
conditions (varying line, load, and temperature).
Typical Application Circuits
*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.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2000–2013, Texas Instruments Incorporated