SC1405

HIGH SPEED SYNCHRONOUS POWER

MOSFET SMART DRIVER

© 2000 SEMTECH CORP.

652 MITCHELL ROAD NEWBURY PARK CA 91320

August 31, 2000

1

BLOCK DIAGRAM

PIN CONFIGURATION

Top View

(14-Pin TSSOP)

DESCRIPTION

The SC1405 is a Dual-MOSFET Driver with an internal

Overlap Protection Circuit to prevent shoot-through

from V

chronous MOSFET’s. Each driver is capable of driving

a 3000pF load in 20ns rise/fall time and has ULTRA-

FAST propagation delay from input transition to the

gate of the power FET’s. The Overlap Protection circuit

ensures that the second FET does not turn on until the

top FET source has reached a voltage low enough to

prevent shoot-through. The delay between the bottom

gate going low to the top gate transitioning to high is

externally programmable via a capacitor for optimal

reduction of switching losses at the operating fre-

quency. The bottom FET may be disabled at light loads

by keeping S_MOD low to trigger asynchronous opera-

tion, thus saving the bottom FET’s gate drive current

and inductor ripple current. An internal voltage refer-

ence allows threshold adjustment for an Output Over-

Voltage protection circuitry, independent of the PWM

feedback loop. Under-Voltage-Lock-Out circuit is in-

cluded to guarantee that both driver outputs are low

when the 5V logic level is less than or equal to 4.4V

(typ) at supply ramp up (4.35V at supply ramp down). A

CMOS output provides status indication of the 5V sup-

ply. A low enable input places the IC in stand-by mode

thereby reducing supply current to less than 10µA.

SC1405 is offered in a high pitch (.025” lead spacing)

TSSOP package.

FEATURES

load)

APPLICATIONS

of small inductors and low cost caps in place of

electrolytics

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

DEVICE

(1)

PACKAGE

TEMP. RANGE (T

SC1405TS.TR

TSSOP-14

0 - 125°C

ORDERING INFORMATION

Note:

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

contains 2500 devices.