POWER MANAGEMENT

1

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SC1210

High Speed, 12 V, Synchronous

Power MOSFET Driver

Features

Applications

August 8, 2003

The SC1210 is a high speed, dual output driver designed

to drive high-side and low-side MOSFETs in a synchro-

nous Buck converter. These drivers can work with many

Semtech PWM controllers to provide a cost effective

multi-phase voltage regulator for advanced micropro-

cessors.

A 30ns max propagation delay from input transition to

the gate of the power FET’s guarantees operation at high

switching frequencies. Internal overlap protection circuit

prevents shoot-through from Vin to PGND in the main

and synchronous MOSFETs. The adaptive overlap pro-

tection circuit ensures the bottom FET does not turn on

until the top FET source has reached 1V, to prevent cross-

conduction.

8.5V gate drive provides optimum enhancement of

MOSFETs at minimum driver and MOSFET switching loss.

High current drive capability allows fast switching, thus

reducing switching losses at high (up to 1.5MHz) frequen-

cies without causing thermal stress on the driver.

Under-voltage-lockout and over-temperature shutdown

features are included for proper protection and safe op-

eration. Timed latches and improved robustness are built

into the safty functions such as the Under Voltage Lock-

out and adaptive Shoot-through protection circuitry to

prevent false triggering. The SC1210 is offered in a stan-

dard SO-8 package.

gate drive

shoot-through protection

load)

of small inductors and low cost ceramic capacitors

Description

Typical Application Circuit

C1

1uF

R1

1R0

C4

10uF

R2

1R0

L1

1

2

Vin (+12V)

Vout

U1

SC1210

1

2

3

4

5

6

7

8

DRN

TG

BST

CO

VIN

VREG

BG

PGND

PWM

Q2

C3

1uF

C5

D1

1N4148

C2

1uF

Q1

R3

2R2

C6

2.2nF