L5972D Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

L5972D

2A SWITCH STEP DOWN SWITCHING REGULATOR

STMicroelectronics 

L5972D

2A SWITCH STEP DOWN SWITCHING REGULATOR

s 2A INTERNAL SWITCH

s OPERATING INPUT VOLTAGE FROM 4.4V

TO 36V

s OUTPUT VOLTAGE ADJUSTABLE FROM

1.235V TO 35V

s LOW DROPOUT OPERATION: 100% DUTY

CYCLE

s 250KHz INTERNALLY FIXED FREQUENCY

s VOLTAGE FEEDFORWARD

s ZERO LOAD CURRENT OPERATION

s INTERNAL CURRENT LIMITING

s PROTECTION AGAINST FEEDBACK

DISCONNECTION

s THERMAL SHUTDOWN

APPLICATIONS:

s CONSUMER: STB, DVD, TV, VCR,CAR

RADIO, LCD MONITORS

s NETWORKING: XDSL, MODEMS,DC-DC

MODULES

s COMPUTER: PRINTERS, AUDIO/GRAPHIC

CARDS, OPTICAL STORAGE, HARD DISK

DRIVE

s INDUSTRIAL: CHARGERS, CAR BATTERY

DC-DC CONVERTERS

SO8 (4+2+2)

ORDERING NUMBERS: L5972D (SO8)

L5972D013TR (Tape & Reel)

DESCRIPTION

The L5972D is a step down monolithic power switch-

ing regulator with a minimum switch current limit of

2A so it is able to deliver more than 1.5A DC current

to the load depending on the application conditions.

The output voltage can be set from 1.235V to 35V.

The device uses an internal P-Channel D-MOS tran-

sistor (with a typical Rdson of 250mΩ) as switching

element to minimize the size of the external compo-

nents.

An internal oscillator fixes the switching frequency at

250KHz.

Having a minimum input voltage of 4.4V only, it is

particularly suitable for 5V bus, available in all com-

puter related applications.

Pulse by pulse current limit with the internal frequen-

cy modulation offers an effective constant current

short circuit protection.

TEST APPLICATION CIRCUIT

VIN = 4.4V to 35V

VCC

8

C1

10µF

35V

CERAMIC

COMP

4

C4

6

22nF

C3

220pF

R3

4.7K

L5972D

OUT

1

L1 33µH

D1

STPS2L40U

5

237

FB

GND

VOUT=3.3V

R1

5.6K

R2

3.3K

C2

100µF

10V

May 2003

D03IN1436

1/10

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