LDO55 datasheet(1/2 Pages) STMICROELECTRONICS

No de pièce	LDO55

Description	IP Library: Very Low Power, Adjustable Output Voltage짼, 25mA Low Dropout Voltage Regulator

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Fabricant	STMICROELECTRONICS [STMicroelectronics]

Site Internet	http://www.st.com

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June 2002

IP Library: Very Low Power, Adjustable Output Voltage²,

25mA Low Dropout Voltage Regulator

s ANALOG BASEBAND REGULATOR

s VERY LOW DROPOUT VOLTAGE : 60mV

s HIGH PSRR : 60dB

s LOW QUIESCENT CURRENT

s 20

µA STD-BY MODE CURRENT

s NO CURRENT IN POWER DOWN MODE

s SHORT CIRCUIT PROTECTION

s SMALL DECOUPLING CERAMIC CAPACITOR

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 (DSP/Microcontroller) devices.

APPLICATION NOTE

An external capacitor (COUT = 1µF typical) with an

equivalent serial resistance (ESR) in the range

0.02 to 0.6

Ω is used to ensure stability.

Figure 1 : Block Diagram

?

VREF

?

LDO_55

OUT

IN

PWRDWN

STDBY

Figure 2 : Typical Application Circuit

1

µF

ESR1

VOUT

COUT

?

OUT

GND

?

VIN

IN

PWRDWN

Power Down Mode

OFF

ON

Stand-by Mode

STDBY

Active Mode

LDO_55

→

Stand-by Mode

→

LDO_55

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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