ST1534A Datasheet

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ST1534A

500mA SMART LDO

s

s

s

s

s

s

s

s

s

GLITCH FREE TRANSITION BETWEEN

INPUT SOURCES

INTERNAL LOGIC SELECTS INPUT

SOURCE

GATE DRIVE FOR EXTERNAL PMOS

BYPASS SWITCH

5V DETECTOR WITH HYSTERESIS

1% 3.3V REGULATED OUTPUT VOLTAGE

500mA GUARANTEED OUTPUT CURRENT

OPERATING TEMPERATURE RANGE

FROM 0掳C TO 85掳C

AVAILABLE IN P

2

PAK PACKAGE

PPAK AND SO-8 PACKAGES CAN BE

AVAILABLE ON REQUEST

P

2

PAK

PPAK

SO-8

APPLICATIONS

s

s

s

s

NETWORK INTERFACE CARDS

PCMCIA/PCI INTERFACE CARDS

DESKTOP COMPUTERS

POWER SUPPLY WITH MULTIPLE INPUT

SOURCES

DESCRIPTION

The ST1534A is intended for application such as

power managed PCI and network interface cards

(NICs), where operations from 3.3V VAUX supply

SCHEMATIC DIAGRAM

V

IN

may be required when the 5V supply has been

shut down.

During regular operation, 3.3V power for the PCI

card is provided by the internal LDO regulator,

generated from 5V supply. When the 5V V

AUX

is

available, the IC connects this supply directly to its

output using an external P-Channel FET. This

ensures an uninterrupted 3.3V out even if VIN falls

out of specification.

When both supplies are available simultaneously,

the drive pin DR will be pulled high, turning off the

PMOS switch.

The device is available in the popular 5 leads

P

2

PAK and PPAK

+

5V Detect

DR

Rpull_down

-

V

IN

Reference

+

-

Error

Amp

V

OUT

GND

April 2003

1/15

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