Datasheet > SG1577_10

SG1577_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	858K
描述
Dual Synchronous DC/DC Controller

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SG1577_10 数据手册

August 2010

SG1577

Dual Synchronous DC/DC Controller

Features

Description

The SG1577 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. 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 0.55mA. The fixed-

frequency is programmable from 60kHz to 320kHz. The

Over-Current Protection (OCP) level can be

programmed by an external current sense resistor. It

has two integrated sets of internal MOSFET drivers.

SG1577 is available in 20-pin SOP and DIP packages.

Integrated Two Sets of MOSFET Drivers

Two Independent PWM Controllers

Constant Frequency Operation: Free-running Fixed

Frequency Oscillator Programmable: 60kHz to

320kHz

Wide Range Input Supply Voltage: 8~15V

Programmable Output as Low as 0.7V

Internal Error Amplifier Reference Voltage:

0.7V±1.5%

Two Soft-Start / EN Functions

Programmable Over-Current Protection (OCP)

30V HIGH Voltage Pin for Bootstrap Voltage

Output Over-Voltage Protection (OVP)

SOP and DIP 20-pin

Applications

CPU and GPU Vcore Power Supply

Power Supply Requiring Two Independent Outputs

Ordering Information

Operating

Temperature Range

Part Number

Package

Packing Method

SG1577SZ

SG1577SY

SG1577DY

-40°C to +85°C

20-Lead, Small Outline Package (SOP-20)

20-Lead, Dual In-Line Package (DIP-20)

Tape & Reel

Tube

-40°C to +85°C

SG1577 • Rev. 1.0.5

www.fairchildsemi.com

12 3 4 5 6 7...15

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