SC194B

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
17页	549K
描述
Selectable 3.6V/3.3V/3.0V/2.5V 1A Synchronous Buck Converter

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SC194B 数据手册

SC194B

Selectable 3.6V/3.3V/3.0V/2.5V

1A Synchronous Buck Converter

POWER MANAGEMENT

Description

Features

The SC194B is a synchronous step-down converter with Up to 95% efﬁciency

integrated power devices. Four selectable output voltages PSAVE operation to maximize efﬁciency

suitable for portable device interface, memory function Output current — 1A

blocks, and 5V to 3.3V voltage conversion are available.

Input range — 2.7V to 5.5V

Four selectable output voltages

Automatic selection of Power Save Mode (PSAVE) is Quiescent current — 17μA in PSAVE

supported which enhances efﬁciency. A 100% duty cycle Dynamic voltage positioning capability

mode allows operation for input voltages close to the Fixed 1MHz frequency or 750kHz to 1.25MHz syn-

required output voltage.

chronized operation

Current mode operation for excellent line and load

transient response

The need for external components is minimized by

providing internal feedback compensation, and allowing 100% duty cycle in dropout

selection of the required output voltage by hard wiring VID Soft-start

code inputs. The maximum current rating of the internal Over-temperature and short-circuit protection

MOSFET switches allows a DC output current of 1A.

Lead-free package — 3mm x 3mm MLPD

The switching frequency is nominally set to 1MHz, allowing

the use of small inductors and capacitors. A ﬂexible

clocking scheme is used that allows synchronization to an

external oscillator or control by the internal oscillator.

Applications

PDA

Pocket PC and Smart Phones

USB Powered Modems

CPUs and DSPs

PC Cards and Notebooks

xDSL Applications

The device can operate in either forced PWM mode or

in PSAVE mode. If PSAVE mode is enabled the part will

automatically enter PSAVE at light loads to maintain

maximum efﬁciency across the full load range. For noise

sensitive applications, PSAVE mode can be disabled by

synchronizing to an external oscillator, or pulling the SYNC/

PWM pin high. Shutdown turns off all the control circuitry

to achieve a typical shutdown current of 0.1μA.

Standard 5-V to 3.3-V Conversion

Typical Application Circuit

SC194B

V_OUT

3.3V

VIN

V_IN

4.7μH

3.6V to 5.5V

SYNC/PWM

VID0

VOUT

C_OUT

C_IN

VID1

MODE

PGND

GND

10μF

22μF

August 24, 2006

www.semtech.com

12 3 4 5 6 7...17

中文翻译

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与SC194B相关器件

型号	品牌	获取价格	描述	数据表
SC194BEVB	SEMTECH	获取价格	Selectable 3.6V/3.3V/3.0V/2.5V 1A Synchronous Buck Converter
SC194BMLTRT	SEMTECH	获取价格	Selectable 3.6V/3.3V/3.0V/2.5V 1A Synchronous Buck Converter
SC195	SEMTECH	获取价格	3.5MHz, 500mA Synchronous Step Down DC-DC Regulator
SC195_10	SEMTECH	获取价格	3.5MHz, 500mA Synchronous Step Down DC-DC Regulator
SC1959	ETC	获取价格	Mini size of Discrete semiconductor elements
SC195B	SEMTECH	获取价格	3.5MHz, 500mA Synchronous Step Down DC-DC Regulator
SC195BCSTRT	SEMTECH	获取价格	3.5MHz, 500mA Synchronous Step Down DC-DC Regulator
SC195BEVB	SEMTECH	获取价格	3.5MHz, 500mA Synchronous Step Down DC-DC Regulator
SC195EVB	SEMTECH	获取价格	3.5MHz, 500mA Synchronous Step Down DC-DC Regulator
SC195F	SEMTECH	获取价格	3.5MHz, 500mA Synchronous Step Down DC-DC Regulator

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