SC4603

更新时间： 2024-11-23 04:05:23

品牌	Logo	应用领域
商升特 - SEMTECH		/
页数	文件大小	规格书
16页	318K
描述
Very Low Input, MHz Operation, High Efficiency Synchronous Buck

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SC4603 数据手册

SC4603

Very Low Input, MHz Operation,

High Efficiency Synchronous Buck

POWER MANAGEMENT

Description

Features

The SC4603 is a voltage mode step down (buck) regula-

tor controller that provides accurate high efficiency power

conversion from input supply range 2.25V 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.

BICMOS voltage mode PWM controller

2.25V to 5.5V Input voltage range

Output voltages as low as 0.5V

Sleep mode (Icc = 10µA typ)

Lossless adjustable overcurrent protection

Combination pulse by pulse & hiccup mode current

limit

High efficiency synchronous switching

0% to 100% Duty cycle range

Synchronization to external clock

Asynchronous start-up

1MHz frequency of operation

10-Pin MSOP surface mount package

The SC4603 drives external complementary power

MOSFETs; P-channel on the high side and N-channel on

the low side. The use of high side P-channel MOSFETs

eliminates the need for an external charge pump and

simplifies the high side gate driver. Non-overlap protec-

tion is provided for the gate drive signals to prevent shoot

through of the MOSFET pair. The voltage drop across the

P-channel MOSFET during its conduction is sensed for

lossless short circuit current limiting.

Applications

Distributed power architecture

Servers/workstations

A low power sleep mode can be achieved by forcing the

SYNC/SLEEP pin below 0.8V. A synchronous mode of op-

eration is activated as the SYNC/SLEEP pin is driven by

an external clock. The quiescent supply current in sleep

mode is typically lower than 10µA. A 1.7ms soft start is

internally provided to prevent output voltage overshoot

during start-up. A 100% maximum duty cycle allows the

SC4603 to operate as a low dropout regulator in the

event of a low battery condition.

Local microprocessor core power supplies

DSP and I/O power supplies

Battery powered applications

Telecommunication equipment

Data processing applications

The SC4603 is an ideal choice for 3.3V, 5V or other low

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

package.

Typical Application Circuit

R15

Vin = 2.25V ~ 5.5V

C14

C10

22u

C11

22u

C12

C13

33n

22u

34.8k

ISET

PDRV

PHASE

NDRV

GND

1.0

4.7u

VCC

2.3u

Vout = 1.5V (as low as 0.5V * ) /6A

SYNC

COMP

VSENSE

150p

150u

1.2n

1.0

22u

14k

SC4603

806

20k

6.98k

* External components can be modified to provide a Vout as low as 0.5V.

Revision: May 5, 2004

www.semtech.com

12 3 4 5 6 7...16

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与SC4603相关器件

型号	品牌	获取价格	描述	数据表
SC4603_08	SEMTECH	获取价格	Very Low Input, MHz Operation,High Efficiency Synchronous Buck
SC4603IMSTRT	SEMTECH	获取价格	Very Low Input, MHz Operation, High Efficiency Synchronous Buck
SC4605	SEMTECH	获取价格	Low Input, High Efficiency Synchronous, Step Down Controller
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

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