MAX757：3.3V/5V/可调输出、升压型DC-DC转换器 _ BDTIC 中国领先电子元器件代理商

MAX757：3.3V/5V/可调输出、升压型DC-DC转换器

对于新设计推荐使用性能更好的器件：MAX1674/MAX1675/MAX1676

The MAX756/MAX757 are CMOS step-up DC-DC switching regulators for small, low input voltage or battery-powered systems. The MAX756 accepts a positive input voltage down to 0.7V and converts it to a higher pin-selectable output voltage of 3.3V or 5V. The MAX757 is an adjustable version that accepts an input voltage down to 0.7V and generates a higher adjustable output voltage in the range from 2.7V to 5.5V. Typical full-load efficiencies for the MAX756/MAX757 are greater than 87%. The MAX756/MAX757 provide three improvements over previous devices. Physical size is reduced-the high switching frequencies (up to 0.5MHz) made possible by MOSFET power transistors allow for tiny (< 5mm diameter) surface-mount magnetics. Efficiency is improved to 87% (10% better than with low-voltage regulators fabricated in bipolar technology). Supply current is reduced to 60µA by CMOS construction and a unique constant-off-time pulse-frequency modulation control scheme.

关键特性

Operates Down to 0.7V Input Supply Voltage
87% Efficiency at 200mA
60µA Quiescent Current
20µA Shutdown Mode with Active Reference and LBI Detector
500kHz Maximum Switching Frequency
±1.5% Reference Tolerance Over Temperature
Low-Battery Detector (LBI/LBO)
8-Pin DIP and SO Packages

MAX756、MAX757：典型工作电路

应用

2节和3节电池供电设备
3.3V至5V升压转换
血糖表
医疗仪表
掌上电脑
个人数据通信/计算机
便携式数据收集设备

数据手册DataSheet

语言	下载文件	备注
英文	MAX756-MAX757.pdf	Rev 2; 01/1995

关键参数

Part Number	V_IN (V)	V_IN (V)	V_OUT1 (V)	V_OUT1 (V)	I_OUT1 (A)	Output Adjust. Method	Switch Type	Power Good Signal	Shutdown Mode Supply Current (µA)	DC-DC Outputs	Oper. Freq. (kHz)	Package/Pins	Budgetary Price
Part Number	min	max	min	max	max	Output Adjust. Method	Switch Type	Power Good Signal	typ	DC-DC Outputs	Oper. Freq. (kHz)	Package/Pins	See Notes
MAX757	0.7	5.5	2.7	5.5	0.3	Resistor	Internal	Yes	0.02	1	500	PDIP(N)/8 SOIC(N)/8	$2.06 @1k

开发工具

MAX756EVKIT

技术资料

Energy Management for Small Portable Systems

订购型号

型号	状况	推荐替代产品	封装	温度	RoHS/无铅
MAX757C/D	停止供货		DICE SALES,；NA引脚；DICE；	0°C至+70°C	参考数据资料
MAX757CPA	停止供货	MAX757CPA+	PDIP(N),；8引脚；79.7mm²	0°C至+70°C	RoHS/无铅：否
MAX757CPA+	生产中		PDIP(N),；8引脚；79.7mm²	0°C至+70°C	RoHS/无铅：无铅
MAX757CSA	停止供货	MAX757CSA+	SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：否
MAX757CSA+	生产中		SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：无铅
MAX757CSA+T	生产中		SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：无铅
MAX757CSA-T	停止供货	MAX757CSA+T	N.SO；8引脚	0°C至+70°C	参考数据资料
MAX757EPA	停止供货		PDIP(N),；8引脚；79.7mm²	-40°C至+85°C	RoHS/无铅：否
MAX757ESA	停止供货	MAX757ESA+	SOIC(N),；8引脚；30.9mm²	-40°C至+85°C	RoHS/无铅：否
MAX757ESA+	生产中		SOIC(N),；8引脚；30.9mm²	-40°C至+85°C	RoHS/无铅：无铅
型号	状况	推荐替代产品	封装：类型引脚占位面积封装图编码/变更 *	温度	RoHS/无铅？
MAX757ESA+T	生产中		SOIC(N),；8引脚；30.9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX757ESA-T	停止供货	MAX757ESA+T	N.SO；8引脚	-40°C至+85°C	参考数据资料

MAX756-MAX757.pdf MAX757

Energy Management for Small Portable Systems MAX604

典型工作电路 MAX757