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LDO_57

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

STMicroelectronics 

LDO_57

IP Library: High Output Current, Low power,

400mA Low Dropout Voltage Regulator

PRODUCT PREVIEW

s DIGITAL BASEBAND REGULATOR

s VERY LOW DROPOUT VOLTAGE : 50mV

s HIGH OUTPUT CURRENT : 400mA

s LOW QUIESCENT CURRENT : 100µA

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.

Figure 2 : Typical Application Circuit

APPLICATION NOTE

An external capacitor (COUT = 4.7µF) with an

equivalent serial resistance (ESR) in the range

0.02 to 0.6Ω is used for regulator stability.

Figure 1 : Block Diagram

IN ?

PWRDWN ?

STDBY ?

VREF

? OUT

LDO_57

VIN

IN

?

OUT

?

VOUT

Power Down Mode

ON

→

OFF

→

Stand-by Mode

Stand-by Mode →

Active Mode →

PWRDWN

?

STDBY

?

LDO_57

GND

?

4.7µF

COUT

ESR

June 2002

1/4

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

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