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POWER MANAGEMENT

SC1218

High Speed

Synchronous MOSFET Driver

Revision: October 14, 2005

Description

Features

Applications

Typical Application Circuit

The SC1218 is a high speed, robust, dual output driver to

drive high-side and low-side N-MOSFETs in synchronous

buck converters. Combined with Semtech’s multi-phase

PWM controller SC2649, one can build high performance,

versatile voltage regulators for next generation micropro-

cessors.

SC1218 is built upon a CMOS technology which provides

enough voltage capacity to handle computer applications.

In addition, the advanced timing circuitry is adopted to

filter out very narrow PWM pulses at the input of the driver.

The latched UVLO and enhanced adaptive shoot-through

protection further enhance the robustness of the SC1218.

With integrated bootstrap diode, the SC1218 is offered in

both SOIC-8 package and MLPQ-8 3x3mm package. These

features further reduce the thermal stress and BOM cost.

Advanced Digital Timing to Filter Out Very Narrow PWM

Pulses

+12V Gate Drive Voltage

Integrated Bootstrap Diode

High Peak Drive Current

Adaptive Non-overlapping Gate Drives Provide Shoot-

through Protection

Support Dynamic VID operation

Ultra-low Propagation Delay

Floating Top Gate Drive

Crowbar Function for Over Voltage Protection

High Frequency (up to 2 MHz) Operation Allows Use of

Small Inductors and Low Cost Ceramic Capacitors

Under Voltage Lockout

Low Quiescent Current

Enable Function for Both Gate OFF Shut Down

Lead-free Part and Fully WEEE and RoHS Compliant

Processor Power

Supplies

High Current Low Voltage DC-DC Converter

s

EN

Cv in

1uF

Rv in

2R2

Cout

PWM

VIN

Mtop

Lout

Cin

Cbst

1uF

SC1218

BST

CO

EN

VIN

BG

PGND

DRN

TG

VOUT

Mbot

Rdrn

(optional)