L4955V3.3 STMicroelectronics, L4955V3.3 Datasheet

L4955V3.3

Manufacturer Part Number

L4955V3.3

Description

5A ULDO LINEAR REGULATORS FAMILY

Manufacturer

STMicroelectronics

Datasheets

1.L4955.pdf (14 pages)

2.L4955V3.3.pdf (14 pages)

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Company:

Bonase Electronics (HK) Co., Limited

Part Number:

L4955V3.3

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4 792

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BOSTOCK HK LIMITED

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L4955V3.3

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APPLICATIONS

DESCRIPTION

The L4955 is a family of monolithic ultra very low

drop linear regulators designed to supply the

most recent microprocessors.

TYPICAL APPLICATIONS

February 1999

function)

CONVERSION

STANDBY FEATURE

UP TO 5A OUTPUT CURRENT

FAST TRANSIENT RESPONSE

0.75V TYP. DROP OUT VOLTAGE AT 5A

OPERATING INPUT VOLTAGE FROM 4.5V

ADJUSTABLE VERSION:

FIXED VERSION:

VERY LOW QUIESCENT CURRENT

SHORT CIRCUIT PROTECTION (Foldback

THERMAL SHUTDOWN

PENTIUM

POST REGULATOR FOR SMPS

LOW COST SOLUTION FOR 5V TO 3.3V

LOW COST BATTERY CHARGER

CONSTANT CURRENT REGULATOR

SUITABLE

2% PRECISE OUTPUT VOLTAGES

INHIBIT (I

POWER GOOD

PROGRAMMABLE CURRENT LIMIT

HEPTAWATT PACKAGE

3.3V, 5.1V OUTPUTS

VERSAWATT PACKAGE

= 1.26V

AND POWER PC

= 120 A TYP.)

FOR

INH

L4955

GND

APPLICATION

OUT

ADJ

5A ULDO LINEAR REGULATORS FAMILY

SUPPLIES

D97IN589

WITH

OUT

The dropout voltage is only 0.75V (Typ.) at 5A, di-

rectly dependent on the output current conditions.

Realized in BCDII technology, it has on board a

charge pump to properly drive an N-channel

power mos Transistor with 150m of R

It operates from a 4.5V minimum supply, with a

very low quiescent current irrespective of the

load; a minimum of 22 F output capacitor is re-

quired for stability.

The on-chip trimming techniques improve the pre-

cision of the available output voltages to 2%.

Ancillary functions like power good, inhibit with

low power consumption, programmable output

voltage and current limiting make the flexible

heptawatt version usable in applications where

power management, stand-by, features, post

regulation and adjustable current generators for

battery chargers are important.

L4955

L4955V3.3

L4955V5.1

ORDERING

NUMBERS

MULTIPOWER BCD TECHNOLOGY

HEPTAWATT

L4955VXXX

VOLTAGE

1.26V ADJ

OUTPUT

3.3V

5.1V

GND

D97IN590

HEPTAWATT

VERSAWATT

OUT

PACKAGE

L4955

(TO-220)

DSON

OUT

1/14

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