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SC4508ABUCKEVB

更新时间： 2024-11-19 03:24:31

品牌	Logo	应用领域
商升特 - SEMTECH		控制器
页数	文件大小	规格书
21页	418K
描述
Buck or Buck-Boost (Inverting) Current Mode Controller

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数据手册

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SC4508ABUCKEVB 数据手册

SC4508A

Buck or Buck-Boost (Inverting)

Current Mode Controller

POWER MANAGEMENT

Features

Description

The SC4508A is a low voltage current mode switching

regulator controller that drives a P-channel power

MOSFET with programmable switching frequency. It can

be configured in either buck or buck boost (inverting) con-

verters. 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 di-

vider. The switching frequency is programmable up to

1.5MHz, allowing small inductor and capacitor values to

minimize PCB space. The operating current level is pro-

grammable via an external sense resistor. Accessible ref-

erence voltage 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

Hiccup mode after 32 cycle-by-cycle OCP

4mm x 4mm MLPQ-12 lead free package. This

product is fully WEEE and RoHS compliant

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

V+

VREF

FB+

FB-

SC4508A

FB+

FB-

SC4508A

OUT

COMP

OUT

COMP

Vout

SS/EN

GND

OSC

SS/EN

GND

OSC

www.semtech.com

Revision: July 25, 2007

12 3 4 5 6 7...21

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