SC4605

更新时间： 2024-11-26 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
19页	423K
描述
Low Input, High Efficiency Synchronous, Step Down Controller

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SC4605 数据手册

SC4605

Low Input, High Efficiency

Synchronous, Step Down Controller

POWER MANAGEMENT

Description

Features

BICMOS voltage mode PWM controller

2.8V to 5.5V Input voltage range

Output voltages as low as 0.8V

+/-1% Reference accuracy

Sleep mode (Icc = 10µA typ)

Lossless adjustable short circuit current limiting

Combination pulse by pulse & hiccup mode

current limit

The SC4605 is a voltage mode step down (buck) regula-

tor controller that provides accurate high efficiency power

conversion from a input supply range of 2.8V to 5.5V. A

high level of integration reduces external component

count, and makes it suitable for low voltage applications

where cost, size and efficiency are critical.

The SC4605 drives external N-channel MOSFETs with 1A

peak current. A non-overlap protection is provided for

the gate drive signals to prevent shoot through of the

MOSFET pair. The voltage drop across the high side

MOSFET during its conduction is sensed for lossless short

circuit current limiting.

High efficiency synchronous switching

0% to 97% Duty cycle range

1A Peak current driver

10-Pin MSOP package

The quiescent supply current in sleep mode is typically Applications

lower than 10µA. A 1.8ms soft start is internally provided

to prevent output voltage overshoot during start-up.

Distributed power architecture

Servers/workstations

Local microprocessor core power supplies

DSP and I/O power supplies

Battery powered applications

Telecommunications equipment

Data processing applications

The SC4605 is an ideal choice for 3.3V, 5V or other low

input supply systems. It’s available in 10 pin MSOP pack-

age.

Typical Application Circuit

Vin = 2.8V - 5.5V

C10

C11

C12

C71

22u

220u

C14

0.1u

R13

BST

DRVH

PHASE

DRVL

4.7u

Vout = 1.5V (as low as 0.8V * ) / 12A

VCC

ISET

COMP

1.8u

GND

4.7n

C20

2.2n

22u

330u

22u

FS/SYNC

FSET

VSENSE

10k

470pF

180p

SC4605

200

14.3k

11.5k

* External components can be modified to provide a Vout as low as 0.8V.

Revision: October 14, 2004

www.semtech.com

12 3 4 5 6 7...19

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与SC4605相关器件

型号	品牌	获取价格	描述	数据表
SC4605IMSTR	SEMTECH	获取价格	Low Input, High Efficiency Synchronous, Step Down Controller
SC4605IMSTRT	SEMTECH	获取价格	Low Input, High Efficiency Synchronous, Step Down Controller
SC4607	SEMTECH	获取价格	Very Low Input, MHz Operation, High Efficiency Synchronous Buck
SC4607IMSTR	SEMTECH	获取价格	Very Low Input, MHz Operation, High Efficiency Synchronous Buck
SC4607IMSTRT	SEMTECH	获取价格	Very Low Input, MHz Operation, High Efficiency Synchronous Buck
SC4608	SEMTECH	获取价格	Low Input, MHz Operation, High Efficiency Synchronous Buck
SC4608EVB	SEMTECH	获取价格	Low Input, MHz Operation, High Efficiency Synchronous Buck
SC4608MLTRT	SEMTECH	获取价格	Low Input, MHz Operation, High Efficiency Synchronous Buck
SC4609	SEMTECH	获取价格	Low Input, MHz Operation, High Efficiency Synchronous Buck
SC4609EVB	SEMTECH	获取价格	Low Input, MHz Operation, High Efficiency Synchronous Buck

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