Datasheet > SG1577A_10

SG1577A_10

更新时间： 2024-11-29 09:27:51

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		控制器
页数	文件大小	规格书
15页	850K
描述
Dual Synchronous DC/DC Controller

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SG1577A_10 数据手册

August 2010

SG1577A

Dual Synchronous DC/DC Controller

Features

Description

The SG1577A is a high-efficiency, voltage-mode, dual-

channel, synchronous DC/DC PWM controller for two

independent outputs. The two channels are operated

out of phase. The internal reference voltage is trimmed

to 0.7V±1.5%. It is connected to the error amplifier’s

positive terminal for voltage feedback regulation.

Integrated Two Sets of MOSFET Drivers

Two Independent PWM Controllers

Constant Frequency Operation: Free-Running

Fixed Frequency Oscillator Programmable:

61kHz to 340kHz

The soft-start circuit ensures the output voltage can be

gradually and smoothly increased from zero to its final

regulated value. The soft-start pin can also be used for

chip-enable function. When two soft-start pins are

grounded, the chip is disabled and the total operation

current can be reduced to under 0.7mA.

Maximum Input Supply Voltage: 15V

Programmable Output as Low as 0.7V

Internal Error Amplifier Reference Voltage:

0.7V±1.5%

Two Soft-Start / EN Functions

The fixed-frequency is programmable from 60kHz to

340kHz. The Over-Current Protection (OCP) level can

be programmed by an external current-sense resistor. It

has two integrated sets of internal MOSFET drivers.

Programmable Over-Current Protection (OCP)

30V HIGH Voltage Pin for Bootstrap Voltage

Output Over-Voltage Protection (OVP)

20-Pin SOP

SG1577A is available in a 20-pin SOP package.

Applications

CPU and GPU Vcore Power Supply

Power Supply Requiring Two Independent Outputs

Ordering Information

Part Number

Operating Temperature Range

-40°C to +105°C

Package

Packing Method

20-Lead, Small Outline Package

(SOP-20)

SG1577ASY

Tape & Reel

SG1577A • Rev. 1.0.2

www.fairchildsemi.com

12 3 4 5 6 7...15

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