SC1175(2000) 데이터 시트보기 (PDF) - Semtech Corporation

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SC1175
(Rev.:2000)

Low Power Dual Synchronous DC/DC Controller With Current Sharing Circuitry

Semtech Corporation 

SC1175

Low Power Dual Synchronous DC/DC

Controller With Current Sharing Circuitry

POWER MANAGEMENT

Description

Features

The SC1175 is a versatile 2 phase, synchronous, voltage mode

PWM controller that may be used in two distinct ways. First, the

SC1175 is ideal for applications where point of use output power

exceeds any single input power budget. Alternatively, the SC1175

can be used as a dual switcher. The SC1175 features a tempera-

ture compensated voltage reference, over current protection with

50% fold-back and internal level-shifted, high-side drive circuitry.

In current sharing configuration, the SC1175 can produce a single

output voltage from two separate voltage sources (which can be

different voltage levels) while maintaining current sharing between

the channels. Current sharing is programmable to allow loading

each input supply as required by the application.

In dual switcher configuration, two feedback paths are provided

for independent control of the separate outputs. The device will

provide a regulated output from flexibly configured inputs (3.3V,

5V, 12V), provided 5V is present for VCC. The two switchers are

180° out of phase to minimize input and output ripple.

Applications

u Graphics cards

u DDR Memory

u Peripheral add-in card

u SSTL Termination

u Dual-Phase power supply

u Power supplies requiring two outputs

u 300kHz fixed frequency operation

u Soft Start and Enable function

u Power Good output provided

u Over current protection with 50% fold-back

u Phase-shifted switchers minimize ripple

u High efficiency operation, >90%

u Programmable output(s) as low as 1.25V

u Industrial temperature range

u SOIC 20 pin package

Two Phase, Current Sharing Controller

u Flexible, same or separate VIN

u Programmable current sharing

u Combined current limit with fold-back

u 2 phases operating opposed for ripple reduction

u Thermal distribution via multi-phase output

Two Independent PWM Controllers

u Flexible, same or separate VIN

u Independent control for each channel

u Independent and separate current limit

u 2 phases operating opposed for ripple reduction (if same

VIN used)

Typical Application Circuit

2 Channels with Current Sharing

Revision 7/31/2000

1

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