MAX1623

更新时间： 2024-11-25 22:57:59

品牌	Logo	应用领域
美信 - MAXIM		稳压器开关
页数	文件大小	规格书
12页	164K
描述
3A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches

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MAX1623 数据手册

19-1436; Rev 1; 9/99

3A, Low-Voltage, Step-Down Regulator with

Synchronous Rectification and Internal Switches

MAX1623

General Description

____________________________Features

The MAX1623 switch-mode buck regulator with syn-

chronous rectification provides local CPU and bus-ter-

mination power in notebook and desktop computers.

An internal 55mΩ (typ), 3A PMOS power switch and

60mΩ (typ), 3A NMOS synchronous-rectifier switch

deliver continuous load currents up to 3A from a 5V

supply with 95% typical efficiency. Output accuracy is

1%, including line and load regulation.

♦ ±1% Output Accuracy, Including Line and Load

Regulation

♦ 94% Efficiency

♦ Internal Switches

55mΩ PMOS Power Switch

60mΩ NMOS Synchronous-Rectifier Switch

♦ Guaranteed 3A Load Capability

♦ Minimal External Components

The MAX1623 features constant-off-time, current-mode

pulse-width-modulation (PWM) control with switching

frequencies as high as 350kHz. An external resistor at

the TOFF pin sets the off-time, allowing optimum design

flexibility in terms of switching frequency, output switch-

ing noise, and inductor size. This device is available in

a space-saving 20-pin SSOP package.

♦ Pin-Selectable Fixed 3.3V, 2.5V, or

Adjustable (1.1V to 3.8V) Output Voltage

♦ +4.5V to +5.5V Input Voltage Range

♦ 400µA (typ) Supply Current

♦ <1µA Shutdown Supply Current

♦ Constant-Off-Time PWM Operation

♦ Switching Frequencies Up to 350kHz

♦ Idle Mode™ Operation at Light Loads

♦ Thermal Shutdown Protection

♦ Available in 20-Pin SSOP

________________________Applications

5V to 3.3V Conversion

Notebook Computer CPU I/O Supply

Desktop Computer Bus-Termination Supply

CPU Daughter Card Supply

DSP Supply

Ordering Information

PART

TEMP. RANGE

PIN-PACKAGE

MAX1623EAP

-40°C to +85°C

20 SSOP

Typical Operating Circuit

Pin Configuration

TOP VIEW

+2.5V

OUTPUT

+5V

INPUT

20 LX

19 PGND

18 LX

MAX1623

17 PGND

PGND

FBSEL

SHDN

MAX1623

16 LX

15 PGND

SHDN

FBSEL

TOFF

14 V

TOFF

COMP REF

GND

13 COMP

12 REF

FB 10

11 GND

SSOP

Idle Mode is a trademark of Maxim Integrated Products.

________________________________________________________________ Maxim Integrated Products

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

12 3 4 5 6 7...12

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与MAX1623相关器件

型号	品牌	获取价格	描述	数据表
MAX1623EAP	MAXIM	获取价格	3A, Low-Voltage, Step-Down Regulator with Synchronous Rectification and Internal Switches
MAX1623EAP+	MAXIM	获取价格	Switching Regulator, Current-mode, 5.5A, 350kHz Switching Freq-Max, CMOS, PDSO20, SSOP-20
MAX1623EAP+T	MAXIM	获取价格	暂无描述
MAX1623EAP-T	MAXIM	获取价格	Switching Regulator, Current-mode, 5.5A, 350kHz Switching Freq-Max, CMOS, PDSO20, SSOP-20
MAX1623EVKIT	MAXIM	获取价格	Low-Cost.High-Speed.SOT23.Single-Supply Op Amps with Rail-to-Rail Outputs[MAX4012/MAX4016/
MAX1624	MAXIM	获取价格	High-Speed Step-Down Controllers with Synchronous Rectification for CPU Power
MAX1624/1625	MAXIM	获取价格	High-Speed Step-Down Controllers with Synchronous Rectification for
MAX1624/MAX1625	MAXIM	获取价格	High-Speed Step-Down Controllers with Synchronous Rectification
MAX1624EAG	MAXIM	获取价格	High-Speed Step-Down Controllers with Synchronous Rectification for CPU Power
MAX1624EAG+	MAXIM	获取价格	Switching Controller, Current-mode, 1000kHz Switching Freq-Max, BICMOS, PDSO24, 0.200 INCH

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