SC198A

更新时间： 2024-10-01 04:05:31

品牌	Logo	应用领域
商升特 - SEMTECH		转换器
页数	文件大小	规格书
15页	353K
描述
Dual DC-DC Buck Converter with High Current Capability

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SC198A 数据手册

SC198A

Dual DC-DC Buck Converter

with High Current Capability

POWER MANAGEMENT

Features

Description

Input voltage range — 2.7V to 5.5V

Dual buck converters with independent control

High eﬃciency — over 90% peak

Up to 800mA Load

Programmable output voltages per channel — 8

Fixed-frequency operation — 1MHz

Optional SYNC clock input

Optional power-save under light-load conditions

Shutdown current <1μA

Soft-start to limit in-rush current

4mm x 4mm MLPQ package

The SC198A is a dual high-eﬃciency synchronous buck

converter designed for use in low power applications.

Each converter is capable of supplying up to 800mA of

average current at one of eight programmable output

voltages used as microprocessor supply voltages.

The SC198A uses a single control logic block for the two

converters, but their controls can be set independently.

The device uses a ﬂexible clocking method allowing the

user to set the ﬁxed internal 1MHz oscillator or synchro-

nize the clock to an external source. The device also has an

optional power-save mode that optimizes eﬃciency for

light loads.

Applications

Mobile phones

Cordless phones

MP3 players

Digital cameras

The SC198A provides output voltage ﬂexibility while con-

serving board space by using control pins to select the

output voltage. This eliminates at least four parts from the

traditional dual buck converter bill of materials.

PDAs

Single Li-Ion cell or (3) NiMH/NiCd cell devices

Digital multimedia broadcast (DMB) devices

Portable gaming systems

Typical Application Circuit

SC198A

4.7μH

VOUTA

VOUTB

VINA

LXA

VOUTA

GNDA

VBATT

VINR

VINB

C_OUTA

ENA

C_IN

CTLA0

CTLA1

CTLA2

ENB

4.7μH

LXB

VOUTB

GNDB

C_OUTB

CTLB0

CTLB1

CTLB2

GNDR

MODE/SYNC

September 26, 2007

12 3 4 5 6 7...15

中文翻译

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