Datasheet > G5728B/C

G5728B/C

更新时间： 2024-04-09 19:01:14

品牌	Logo	应用领域
致新 - GMT		/
页数	文件大小	规格书
2页	179K
描述
EN, GND, LX, VIN, VFB, SS=0.6ms, VFB, GND, VIN, GND, LX, EN, SS=0.6ms

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G5728B/C 数据手册

Global Mixed-mode Technology

G5728B

1.4MHz 1A Synchronous Step-Down Regulator

General Description

Features

The G5728B is a high efficiency monolithic synchro-

nous buck regulator using a constant frequency, cur-

rent mode architecture. Supply current during opera-

tion is only 50µA and drops to <1µA in shutdown. The

2.5V to 6V input voltage range makes the G5728B

ideally suited for single Li-Ion battery-powered applica-

tions. 100% duty cycle provides low dropout operation,

extending battery run time in portable systems.

Switching frequency is internally set at 1.4MHz, allow-

ing the use of small surface mount inductors and ca-

pacitors. The internal synchronous switch increase

efficiency and eliminates the need for an external

Schottky diode. Built-in soft start function eliminates

in-rush current that could damage the system.

High Efficiency: Up to 93%

Low Quiescent Current: Only 50µA During Op-

eration

Internal Soft Start Function

1A Output Current

2.5V to 6V Input Voltage Range

1.4MHz Switching Frequency

No Schottky Diode Required

100% Duty Cycle in Dropout Operation

0.6V Reference Allows Low Output Voltages

<1µA Shutdown Current

Current Mode Operation for Excellent Line and

Load Transient Response

Over Temperature Protected

RoHS Compliant

Applications

Cellular Telephones

Personal Information Appliances

Microprocessors and DSP Core Supplies

Wireless and DSL Modems

Digital Still and Video Cameras

MP3 Players

Portable Instruments

Ordering Information

TEMP.

PACKAGE

(Green)

ORDER

OUTPUT

MARKING

RANGE

NUMBER

VOLTAGE (V)

G5728BT11U

G5728BTO1U

G5728B-12TO1U

G5728BU51D

578Bx

578Dx

578B

Adjustable

1.2

-40°C~ +85°C

SOT-23-5

TSOT-23-5

WDFN2X2-6

Adjustable

Note: T1: SOT-23-5 TO:TSOT-23-5 U5:WDFN2X2-6

1: Bonding Code

U&D: Tape & Reel

Pin Configuration

Typical Application Circuit

G5728B

2.2µH

V_IN

4~6V

V_OUT

3.3V

VIN

G5728B

300mA

C_FB

(option)

GND

VFB

VIN

VFB

C_IN

2.2µF

CER

C_OUT

10µF

CER

VFB

GND

VIN

GND

82k

GND

R2*

18k

GND

V_OUT= 0.6V × (1+

)

SOT-23-5/TSOT-23-5

WDFN2X2-6

* R2≦20kΩ for stability consideration.

TEL: 886-3-5788833

http://www.gmt.com.tw

Ver: 0.7

Jul 12, 2013

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