Datasheet > MAX639

MAX639

更新时间： 2023-12-20 18:46:21

品牌	Logo	应用领域
亚德诺 - ADI		DC-DC转换器
页数	文件大小	规格书
13页	772K
描述
5V/3.3V/3V/可调、高效率、低IQ、降压型DC-DC转换器

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

MAX639 数据手册

19-4505; Rev 4; 7/05

5V/3.3V/3V/Adjustable, High-Efficiency,

Low I_Q, Step-Down DC-DC Converters

_______________General Description

____________________________Features

♦ High Efficiency for a Wide Range of Load Currents

♦ 10µA Quiescent Current

The MAX639/MAX640/MAX653 step-down switching

regulators provide high efficiency over a wide range of

load currents, delivering up to 225mA. A current-limiting

pulse-frequency-modulated (PFM) control scheme gives

the devices the benefits of pulse-width-modulated

(PWM) converters (high efficiency at heavy loads), while

using only 10µA of supply current (vs. 2mA to 10mA for

PWM converters). The result is high efficiency over a

wide range of loads.

♦ Output Currents Up to 225mA

♦ Preset or Adjustable Output Voltage:

5.0V (MAX639)

3.3V (MAX640)

3.0V (MAX653)

The MAX639/MAX640/MAX653 input range is 4V to

11.5V, and the devices provide lower preset output volt-

ages of 5V, 3.3V, and 3V, respectively. Or, the output

can be user-adjusted to any voltage from 1.3V to the

input voltage.

♦ Low-Battery Detection Comparator

♦ Current-Limiting PFM Control Scheme

______________Ordering Information

The MAX639/MAX640/MAX653 have an internal 1A power

MOSFET switch, making them ideal for minimum-compo-

nent, low- and medium-power applications. For increased

output drive capability, use the MAX649/MAX651/MAX652

step-down controllers, which drive an external P-channel

FET to deliver up to 5W.

PART

TEMP RANGE

0°C to +70°C

PIN-PACKAGE

8 Plastic DIP

8 SO

MAX639CPA

MAX639CSA

MAX639C/D

MAX639EPA

MAX639ESA

MAX639MJA

0°C to +70°C

Dice*

-40°C to +85°C

-55°C to +125°C

8 Plastic DIP

8 SO

________________________Applications

9V Battery to 5V, 3.3V, or 3V Conversion

High-Efficiency Linear Regulator Replacement

Portable Instruments and Handy-Terminals

5V-to-3.3V Converters

8 CERDIP

Ordering Information continued on last page.

*Contact factory for dice specifications.

__________Typical Operating Circuit

__________________Pin Configuration

TOP VIEW

INPUT

5.5V TO 11.5V

OUTPUT

V+

225mA

VOUT

LBO

SHDN

VFB

MAX639

MAX640

MAX653

MAX639

SHDN

LBI

ON/OFF

VOUT

LBO

LBI

V+

LOW-BATTERY

DETECTOR

OUTPUT

LOW-BATTERY

DETECTOR

INPUT

GND

DIP/SO

VFB

GND

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...13

中文翻译

下载PDF

与MAX639相关器件

型号	品牌	获取价格	描述	数据表
MAX639_05	MAXIM	获取价格	5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Conver
MAX6390	MAXIM	获取价格	SC70, Single/Dual Low-Voltage, Low-Power レP R
MAX6390	ADI	获取价格	SC70/μDFN封装、单/双路、低电压、低功耗、微处理器复位电路
MAX6390LT	MAXIM	获取价格	SC70/μDFN, Single/Dual Low-Voltage, Low-Power
MAX6390LT__D_+T	MAXIM	获取价格	SC70/Î¼DFN, Single/Dual Low-Voltage, Low-Powe
MAX6390LT16D7+T	MAXIM	获取价格	Power Supply Support Circuit, Fixed, 1 Channel, BICMOS, PDSO6, 1.50 X 1 MM, 0.80 MM HEIGHT
MAX6390LT17D7+	MAXIM	获取价格	Power Supply Support Circuit, MICRO, DFN-6
MAX6390LT18D4+	MAXIM	获取价格	Power Supply Support Circuit, MICRO, DFN-6
MAX6390LT18D7+	MAXIM	获取价格	Power Supply Support Circuit, MICRO, DFN-6
MAX6390LT19D4+	MAXIM	获取价格	Power Supply Support Circuit, MICRO, DFN-6

与MAX639相关文章

BSS138LT3G：一款高效能N沟道MOSFET的全面解析
2024-07-04

6
解读EGP10B二极管资料手册：产品特性、参数分析
2024-07-04

6
RT9164AGG手册资料详解：引脚信息、设计指南
2024-07-04

8
2SA1037KPT资料详解：产品特性、电气参数、设计指南
2024-07-04

8

产品中心

服务支持

精选活动

关于我们

帮助中心

MAX639

MAX639 数据手册

与MAX639相关器件

与MAX639相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

MAX639

MAX639 数据手册

与MAX639相关器件

与MAX639相关文章

您还可以找

您在本页遇到什么问题？