L4957A

UP TO 5A ULDO LINEAR REGULATOR

PRODUCT PREVIEW

1.5V, 1.8V, 2.5V AND 3.3V FIXED OUTPUT

VOLTAGE

3V TO 14V INPUT VOLTAGE RANGE

200m

0.6V max. DROP-OUT AT 2A

EXCELLENT LOAD REGULATION

0.6mA QUIESCENT CURRENT AT ANY LOAD

SHORT CIRCUIT PROTECTION

THERMAL SHUTDOWN

APPLICATIONS

MOTHER BOARDS

PROCESSOR I/O & SUPPLIES

LOW VOLTAGE MEMORY & CHIP SET SUP-

PLIES

GRAPHIC & SOUND CARDS

LOW VOLTAGE LOGIC SUPPLIES

POST REGULATOR FOR SMPS

DESCRIPTION

The L4957A devices are Ultra Low Drop Output

linear regulators with an internal N-channel MOS

of 200m

Ω particulary suitable for low voltage/low

dropout applications.

Operating with a input voltage from 3V to 14V

they are capable to deliver up to 5A.

The devices are ideal for use as one of the sup-

plies required by processor, for example they are

the cost effective and efficient solution for conver-

sion from 3.3V (rail bus) to 2.5V @ 2.5A or to

1.5V with high current rating.

Fast response transient minimise the output ca-

pacitor value. A minimum of 22

µF assures the

stability in all load conditions.

The on-chip trimming technique offers a tighter

voltage reference tolerance (with

± 2% including

line and load variation) beside to ensure a con-

trolled short circuit current. Thermal shutdown

provides protection against overload conditions

that creates excessive junction temperature.

This is preliminary information on a new product now in development. Details are subject to change without notice.

May 2000

®

L4957A

GND

OUT

IN

3

2

1

C1

3V to 14V

C2

D00IN1107A

TYPICAL APPLICATION

ORDERING NUMBERS:

L4957AV1.5

L4957AD1.5

L4957AV1.8

L4957AD1.8

L4957AV2.5

L4957AD2.5

L4957AV3.3

L4957AD3.3

MULTIPOWER BCD TECHNOLOGY

1

3

D

Versawatt TO-220

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