LDO57 datasheet(1/4 Pages) STMICROELECTRONICS

Il numero della parte	LDO57

Spiegazioni elettronici	IP Library: High Output Current, Low power, 400mA Low Dropout Voltage Regulator

PDF	4 Pages

Scroll/Zoom	100%

Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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June 2002

IP Library: High Output Current, Low power,

400mA Low Dropout Voltage Regulator

s DIGITAL BASEBAND REGULATOR

s VERY LOW DROPOUT VOLTAGE : 50mV

s HIGH OUTPUT CURRENT : 400mA

s LOW QUIESCENT CURRENT : 100

µA

s HIGH PSRR : 60dB

s LOW OUTPUT VOLTAGE NOISE

s NO CURRENT IN POWER DOWN MODE

s SHORT CIRCUIT PROTECTION

TYPICAL APPLICATIONS

– Cellular and Cordless phones supplied by 1 cell

Lithium-ion battery / 3 cells Ni-MH or Ni-Cd

battery.

– PDA (Personal Digital Assistant), Smart phone.

– Portable equipment.

– Supply for Digital Baseband devices for cellular

phone.

APPLICATION NOTE

An external capacitor (COUT = 4.7µF) with an

equivalent serial resistance (ESR) in the range

0.02 to 0.6

Ω is used for regulator stability.

Figure 1 : Block Diagram

?

VREF

?

LDO_57

OUT

IN

PWRDWN

STDBY

Figure 2 : Typical Application Circuit

4.7

µF

ESR

VOUT

COUT

?

OUT

GND

?

VIN

IN

PWRDWN

Power Down Mode

OFF

ON

Stand-by Mode

STDBY

Active Mode

LDO_57

→

Stand-by Mode

→

LDO_57

This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

PRODUCT PREVIEW

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