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LP2957, LP2957A
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SNVS102B –MAY 2004–REVISED NOVEMBER 2004
LP2957/LP2957A 5V Low-Dropout Regulator for µP Applications
Check for Samples: LP2957, LP2957A
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FEATURES
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• 5V output within 1.4% over temperature (A
• Extremely tight line and load regulation
grade)
• Very low temperature coefficient
• Easily programmed for snap-on/snap-off
• Current and thermal limiting
output
• Error flag signals when output is out of
• Guaranteed 250 mA output current
regulation
• Extremely low quiescent current
APPLICATIONS
• Low Input-Output voltage required for
regulation
• High-efficiency linear regulator
• Reverse battery protection
• Battery-powered regulator
DESCRIPTION
The LP2957 is a 5V micropower voltage regulator with electronic shutdown, error flag, very low quiescent current
(150 µA typical at 1 mA load), and very low dropout voltage (470 mV typical at 250 mA load current).
Output can be wired for snap-on/snap-off operation to eliminate transition voltage states where µP operation may
be unpredictable.
Output crowbar (50 mA typical pull-down current) will bring down the output quickly when the regulator snaps off
or when the shutdown function is activated.
The part has tight line and load regulation (0.04% typical) and low output temperature coefficient (20 ppm/°C
typical).
The accuracy of the 5V output is guaranteed at room temperature and over the full operating temperature range.
The LP2957 is available in the five-lead TO-220 and TO-263 packages.
Package Outline
Figure 1. Top View
Bent, Staggered Leads
5-Lead TO-220 (T)
Figure 2. Top View
Plastic Surface Mount Package
5-Lead TO-263 (S)
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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.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2004, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
