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SC457

Single-Phase Single Chip Vcore Power Supply

Semtech Corporation 

NOT RECOMMENDED FOR NEW DESIGN

SC457

POWER MANAGEMENT

Single-Phase Single Chip

Vcore Power Supply

Description

Features

The SC457 is a single phase, high performance PWM con-

Single-Phase Solution with Integrated Drivers

troller designed to power advanced processors. On-chip

support is provided for VID on-the-fly transitions and active

voltage positioning.

Hysteretic Control for Fast Transient Response

Active Voltage Positioning

True Differential Remote (die) Sensing

The SC457 implements hysteretic control technology

providing the fastest possible transient response while

avoiding the stability issues inherent to classical PWM

controllers. Eliminating the sense resistors reduces costs

On-Chip Support for all Power Management

Features

Programmable Soft-Start and DAC Slew Control

Programmable OCP Threshold

and PCB area while increasing system efficiency. Integrated

Supports all Ceramic Decoupling Solutions

SmartDriver™ technology initially turns on the high-side

driver with soft drive to reduce ringing, EMI, and capacitive

D turn-on of the low side MOSFET, while increasing overall

E efficiency.

32-Pin MLP (5x5) - product is WEEE and RoHS

compliant

Default 1.2V Boot Voltage

Soft OFF State

D Hysteretic operation adaptively reduces the SC457 switch-

N N ing frequency at light loads. Combined with an automatic

E IG power-save mode which prevents negative current flow in

the low-side FET, system efficiency is significantly enhanced

M S during light loading conditions.

OM DE A 7-bit DAC, accurate to 0.85%, sets the output voltage

reference and implements the 0.300V to 1.500V range

C required by the processor. The DAC slew rate is externally

E W programmed to minimize transient currents and audible

R E noise. True differential remote sensing provides accurate

N point-of-load regulation at the processor die. Other features

T include programmable soft-start, open-drain PG_DEL and

O R PG# outputs, dynamic current sharing, over-voltage and

N O programmable over-current protection. The SC457 is avail-

F able in a space-saving 32-pin MLP package.

Applications

Notebook PCs

Embedded Applications

Graphics and other Processor Cores

April 12, 2006

1

www.semtech.com

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