sc1471 Semtech Corporation, sc1471 Datasheet

sc1471

Manufacturer Part Number

sc1471

Description

Power Supply Controller For Portable Pentium Iii Speedstep? Processors

Manufacturer

Semtech Corporation

Datasheet

1.SC1471.pdf (1 pages)

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The SC1471 PowerStep™ II controller is a high speed,

high performance hysteretic mode PWM controller.

Teamed with the SC1405 Smart Driver™ , it powers ad-

vanced Intel

tures extended Intel Mobile Voltage Positioning (IMVP) to

increase battery life by reducing the voltage at the pro-

cessor when it is heavily loaded. It directly supports Intel

SpeedStep™ processors for even longer battery life, in-

cluding IMVP extensions. The SC1471 incorporates di-

rect “deeper sleep” mode support, which eliminates an

external multiplexer in many applications.

A 5-bit DAC, accurate to 0.85%, sets the output voltage

reference and implements the 0.600V to 1.750V range

required by the processor. The hysteretic converter uses

a comparator without an error amplifier, and therefore

provides the fastest possible transient response, while

avoiding the stability issues inherent to classical PWM

controllers.

The SC1471 operates from either 3.3Vdc or 5Vdc Vcc

and also features soft-start, an open-drain power-good

indication with power-good blanking, and an enable in-

put. Programmable current limiting uses a separate com-

parator to protect against overloads and short-circuits.

In addition, it comes in a space-saving TSSOP-24 pack-

age.

Revision: June 29, 2004

Description

Typical Application Circuit

POWER MANAGEMENT

Pentium

Power

Control

Signals

VID [4:0]

Control

Signals

+V_5

III processors. The SC1471 fea-

Extended

IMVP

Logic

Extended IMVP

CONTROLLER

SC1471

PWM

Controller

Power Supply Controller for Portable

Pentium

SC1405C

Smart

MOSFET

Driver

Features

Applications

Direct “deeper sleep” mode support

High-speed hysteretic controller provides high

efficiency over a wide operating load range

Fastest possible transient response

Inherently stable

Integrated extended IMVP support

Programmable core voltage for Pentium

sors

Native Intel

blanking

Proportional overvoltage protection

Overcurrent shutdown after 32 overcurrent pulses

SC1471A also available for VID controlled “Deeper

Sleep” mode

Laptop and notebook computers

High performance microprocessor-based systems

High efficiency distributed power supplies

III SpeedStep

SpeedStep™ support with PWRGD

+VCC_CPU_CORE

0.600V-1.75V

Up to 25A

™

+V_IN

Processors

www.semtech.com

SC1471

III proces-

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