Datasheet > SC453_09

SC453_09

更新时间： 2024-11-19 09:33:23

品牌	Logo	应用领域
商升特 - SEMTECH		控制器
页数	文件大小	规格书
26页	338K
描述
Portable, VID Programmed Single Phase Power Supply Controller

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SC453_09 数据手册

SC453

Portable, VID Programmed Single

Phase Power Supply Controller

POWER MANAGEMENT

Description

Features

ꢀ High Speed Hysteretic Controller

ꢀ Single Phase Operation

The SC453 IC is a single chip high-performance Hysteretic

PWM controller. With its integrated SmartDrive™ it pow-

ers advanced graphics and core processors. It provides

sleep mode and boot voltage support. Automatic power-

save is present to prevent negative current flow in the low-

side FET during light loading conditions saving even more

power. The high side driver initially turns on with a weak

drive to reduce ringing, EMI, and capacitive turn-on of the

low side.

ꢀ Selectable Analog or VID Controlled Sleep Setting

ꢀ

6 Bit VID programmable Output

Integrated Drivers with SmartDrive™

Programmable Soft-Start

Programmable Boot Voltage

Programmable Sleep Voltage with Sleep Mode

Under-Voltage Lockout on V_CCAand V₅

Over-voltage Protection on V_CORE

Current Limit Protection on V_CORE

Thermal Protection

Power Good Flag with Blanking During

V_COREChanges

A 6-bit DAC (accurate to 0.85%) sets the output voltage

reference and implements the 0.700V to 1.708V range

required by the processor. The hysteretic converter uses

a comparator without an error amplifier to provide fast

transient response while avoiding the stability issues in-

herent to classical PWM controllers. The DAC is externally

slew rate limited to minimize transient currents and au-

dible noise.

ꢀ

Automatic Power Save at Light Load

Package Types — TSSOP-28, MLPQ-32

The SC453 operates from a 5V supply and also features

soft-start, an open-drain power good signal with V_COREtran-

sition blanking, and an enable input. Programmable cur-

rent limiting shuts down the SC453 after 32 current limit

pulses.

Applications

ꢀ

Low Power Notebook and Laptop Computers

Embedded Applications

ꢀ

PowerStep IV™ and Smart Driver™ are trademarks

of Semtech Corporation.

Typical Application Circuit

VIN

V₅

V_CCA

VCORE

0.700V – 1.708V

Smart

Driver

SC453 Single Phase

Power Supply

PWM

Controller

VID Logic

and DAC

VID (5:0)

www.semtech.com

June 22, 2009

12 3 4 5 6 7...26

中文翻译

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SC4538ULTRT	SEMTECH	获取价格	High Effi ciency Boost Converter for up to 10 LEDs
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