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LP2957IT Datasheet

  • LP2957IT

  • 5V Low-Dropout Regulator for P Applications

  • 14頁

  • NSC

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LP2957/LP2957A 5V Low-Dropout Regulator for 碌P Applications
June 1998
LP2957/LP2957A
5V Low-Dropout Regulator for 碌P Applications
General Description
The LP2957 is a 5V micropower voltage regulator with elec-
tronic shutdown, error flag, very low quiescent current
(150 碌A(chǔ) 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 elimi-
nate transition voltage states where 碌P operation may be un-
predictable.
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/藲C typical).
The accuracy of the 5V output is guaranteed at room tem-
perature and over the full operating temperature range.
The LP2957 is available in the five-lead TO-220 and TO-263
packages.
Features
n
n
n
n
n
n
n
n
n
n
5V output within 1.4% over temperature (A grade)
Easily programmed for snap-on/snap-off output
Guaranteed 250 mA output current
Extremely low quiescent current
Low Input-Output voltage required for regulation
Reverse battery protection
Extremely tight line and load regulation
Very low temperature coefficient
Current and thermal limiting
Error flag signals when output is out of regulation
Applications
n
High-efficiency linear regulator
n
Battery-powered regulator
Package Outline
Bent, Staggered Leads
5-Lead TO-220 (T)
DS011340-16
Top View
Order Number LP2957AIT or LP2957IT
See NS Package Number T05D
Plastic Surface Mount Package
5-Lead TO-263 (S)
DS011340-17
Top View
DS011340-18
Side View
Order Number LP2957AIS or LP2957IS
See NS Package Number TS5B
漏 1999 National Semiconductor Corporation
DS011340
www.national.com

LP2957IT 產(chǎn)品屬性

  • 45

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 線性

  • -

  • 正，固定式

  • 5V

  • 6 V ~ 30 V

  • 0.47V @ 250mA

  • 1

  • 250mA

  • -

  • -40°C ~ 125°C

  • 通孔

  • TO-220-5 成形引線

  • TO-220-5

  • 管件

  • *LP2957IT

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