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1 A Synchronous Switching Regulator

June 28, 2000

SC1409

TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com

DESCRIPTION

The SC1409 is a versatile, voltage-mode switching

regulator designed for use in battery operated power

supply applications. A simple, fixed-voltage buck regu-

lator can be implemented using the SC1409 with a

minimum of external components. Internal MOSFETs

and control circuitry minimize board space and design

time. The small device footprint allows for compact

circuit design.

SC1409 features include a temperature compensated

voltage reference, triangle wave oscillator, hiccup

mode current limit, an internally compensated error

amplifier, overcurrent temperature protection, soft

start, and under voltage lock out.

The SC1409 operates at a selectable, fixed frequency

of 300kHz or 500kHz, or can be synchronized to an

external clock within this range, providing an optimum

compromise between efficiency, external component

size, and cost.

FEATURES

鈥?

Internal MOSFETs

鈥?

Excellent efficiency >88%

鈥?

1% Voltage accuracy

鈥?

Built-in over current protection

鈥?

1A Output current

鈥?

5碌A(chǔ) Standby current

鈥?

Industrial temperature range

鈥?

300kHz/500kHz selectable frequency

APPLICATIONS

鈥?

Handheld equipment

鈥?

PDA power supplies

鈥?

Notebook I/O power supplies

鈥?

Peripheral card supplies

鈥?

High density DC/DC conversion

ORDERING INFORMATION

DEVICE

(1)

PACKAGE

SO-8

SC1409ISTR

Note:

(1) Only available in tape and reel packaging. A reel

contains 2500 devices.

APPLICATION CIRCUIT

Vin=5V

R1

OPEN

U1

1

2

Vout

3.45V

3.30V

3.10V

2.90V

2.80V

2.50V

1.50V

R3

1.87k

1.74k

1.58k

1.40k

1.33k

1.07k

249

R4

1.00k

1.00k

1.00k

1.00k

1.00k

1.00k

1.00k

C6

0.1uF

SYNC/FSET

EN/SS

AGND

FB

SC1409IS

ISET

VIN

8

7

6

L1

5

R2

100uH

Vout

3

4

+

C1

47uF/16V

C3

0.033uF

PHASE

PGND

+

C2

47uF/16V

R4

1

漏 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

next

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