SC4602A

更新时间： 2024-11-26 03:58:51

品牌	Logo	应用领域
商升特 - SEMTECH		控制器
页数	文件大小	规格书
18页	354K
描述
High Efficiency Synchronous, Step Down Controller

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SC4602A 数据手册

SC4602A/B

High Efficiency Synchronous,

Step Down Controller

POWER MANAGEMENT

Description

Features

BICMOS Voltage mode PWM controller

2.75V to 5.5V Input voltage range

Output voltages as low as 0.8V

+/-1% Reference accuracy

The SC4602A/B is a voltage mode step down (buck) regu-

lator controller that provides accurate high efficiency

power conversion from an input supply range of 2.75V

to 5.5V. A high level of integration reduces external com-

ponent count and makes it suitable for low voltage appli-

cations where cost, size and efficiency are critical.

Sleep Mode (Icc = 10µA typ)

Lossless short circuit current limiting

Combination pulse by pulse & hiccup mode current

limit

High efficiency synchronous switching

Up to 100% Duty cycle range

Synchronization to external clock

8-Pin MSOP surface mount package. Lead-free pack-

age available, fully WEEE and RoHS compliant

The SC4602A/B 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 MOSFET

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. Voltage drop across the P-

channel MOSFET during its conduction is sensed for

lossless short circuit current limiting.

Applications

Distributed power system

RF power supply

Local microprocessor core power supplies

DSP and I/O power supplies

Battery powered applications

Servers and 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 soft start (2.4ms for

the SC4602A and 1.2ms for the SC4602B) is internally

provided to prevent output voltage overshoot during start-

up. A 100% maximum duty cycle allows the SC4602A/B

to operate as a low dropout regulator in the event of a

low battery condition. The SC4602A/B has fixed switch-

ing frequency (300KHz for the SC4602A and 550KHz

for the SC4602B).

The SC4602A/B is an ideal choice for 3.3V, 5V or other

low input supply sytems. It’s available in a 8 pin MSOP

package.

Typical Application Circuit

R15

Vin = 2.75V ~ 5.5V

C10

22u

C11

C12

C13

22u

1.0

VCC

PDRV

Vo = 1.5V (as low as 0.8V )/6A

SYNC/SLEEP NDRV

4.7u

1.6u

COMP

GND

150u

22u

VSENSE

PHASE

3.3n

1.0

SC4602B

4.64k

6.8n

470p

5.11k

169

5.36k

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

Revision: January 20, 2006

www.semtech.com

12 3 4 5 6 7...18

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与SC4602A相关器件

型号	品牌	获取价格	描述	数据表
SC4602AEVB	SEMTECH	获取价格	High Efficiency Synchronous, Step Down Controller
SC4602AIMSTR	SEMTECH	获取价格	High Efficiency Synchronous, Step Down Controller
SC4602AIMSTRT	SEMTECH	获取价格	High Efficiency Synchronous, Step Down Controller
SC4602BEVB	SEMTECH	获取价格	High Efficiency Synchronous, Step Down Controller
SC4602BIMSTR	SEMTECH	获取价格	High Efficiency Synchronous, Step Down Controller
SC4602BIMSTRT	SEMTECH	获取价格	High Efficiency Synchronous, Step Down Controller
SC4603	SEMTECH	获取价格	Very Low Input, MHz Operation, High Efficiency Synchronous Buck
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

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