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L5973D

2.5A SWITCH STEP DOWN SWITCHING REGULATOR

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2.5A INTERNAL SWITCH

OPERATING INPUT VOLTAGE FROM 4.4V TO 36V

3.3V / (鹵2%) REFERENCE VOLTAGE

OUTPUT VOLTAGE ADJUSTABLE FROM

1.235V TO 35V

LOW DROPOUT OPERATION: 100% DUTY

CYCLE

250KHz INTERNALLY FIXED FREQUENCY

VOLTAGE FEEDFORWARD

ZERO LOAD CURRENT OPERATION

INTERNAL CURRENT LIMITING

INHIBIT FOR ZERO CURRENT

CONSUMPTION

SYNCHRONIZATION

PROTECTION AGAINST FEEDBACK

DISCONNECTION

THERMAL SHUTDOWN

HSOP8 - EXPOSED PAD

ORDERING NUMBER: L5973D

DESCRIPTION

The L5973D is a step down monolithic power switch-

ing regulator with a minimum switch current limit of

2.5A so it is able to deliver more than 2A DC current

to the load depending on the application conditions.

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

The high current level is also achieved thanks to an

SO8 package with exposed frame, that allows to re-

duce the R

th(j-amb)

down to approximately 40擄C/W

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

sistor (with a typical Rdson of 250m鈩? 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.

APPLICATIONS:

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CONSUMER: STB, DVD, TV, VCR,CAR

RADIO, LCD MONITORS

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NETWORKING: XDSL, MODEMS,DC-DC

MODULES

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COMPUTER: PRINTERS, AUDIO/GRAPHIC

CARDS, OPTICAL STORAGE, HARD DISK

DRIVE

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INDUSTRIAL: CHARGERS, CAR BATTERY

DC-DC CONVERTERS

TEST APPLICATION CIRCUIT

3.3V

VIN = 4.4V to 35V

VREF

VCC

SYNC.

C1

10碌F

35V

CERAMIC

COMP

C4

22nF

C3

220pF

R3

4.7K

6

8

2

4

INH

1

OUT

L1 15碌H

D1

STPS340U

VOUT=3.3V

L5973D

3

7

5

FB

GND

R1

5.6K

C2

330碌F

10V

R2

3.3K

D03IN1439

May 2003

1/10

next

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