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SC4508IMLTRT

更新时间： 2024-11-19 04:05:23

品牌	Logo	应用领域
商升特 - SEMTECH		控制器
页数	文件大小	规格书
10页	199K
描述
Buck or Buck-Boost(Inverting) Current Mode Controller

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数据手册

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SC4508IMLTRT 数据手册

SC4508

Buck or Buck-Boost(Inverting)

Current Mode Controller

POWER MANAGEMENT

Features

Description

The SC4508 is a low voltage current mode switching regu-

lator controller that drives a P-channel power MOSFET

with programmable switching frequency. It can be con-

figured in either buck or buck boost (inverting) convert-

ers. The converters can be operated from 2.7V to 15V

input voltage range. The typical operating supply current

is 3mA and a shutdown pin allows the user to turn the

controller off reducing it to less than 200µA. The output

voltage can adjusted by external resistor divider. The

switching frequency is programmable up to 1.5MHz,

allowing small inductor and capacitor values to minimize

PCB space. The operating current level is programmable

via an external sense resistor. Accessible reference volt-

age allows users to make output voltage as low as they

want.

Wide input voltage range 2.7V to 15V

Programmable output voltage

Programmable switching frequency up to 1.5MHz

Buck or buck boost(inverting) configuration

Current mode control with slope compensation

Very low quiescent current in shutdown mode

Accessible reference voltage

MLPQ-12 package

Applications

Low power point of use converters

Single or multiple output low power converters

Positive and/or negative output voltage

DSL cards

Graphic cards

I/O cards

Negative bias supplies

Typical Application Circuits

Vin

VDD

VREF

FB+

FB-

SC4508

FB+

FB-

SC4508

OUT

COMP

OUT

COMP

SS/SHDN

GND

OSC

SS/SHDN

GND

OSC

www.semtech.com

Revision: November 30, 2004

12 3 4 5 6 7...10

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