MAX857：3.3V/5V或可调输出、升压型DC-DC转换器 _ BDTIC 中国领先电子元器件代理商

MAX857：3.3V/5V或可调输出、升压型DC-DC转换器

The MAX856-MAX859 are high-efficiency, CMOS, step-up, DC-DC switching regulators for small, low input voltage or battery-powered systems. The MAX856/MAX858 accept a positive input voltage between 0.8V and VOUT and convert it to a higher, pin-selectable output voltage of 3.3V or 5V. The MAX857/MAX859 adjustable versions accept 0.8V to 6.0V input voltages and generate higher adjustable output voltages in the 2.7V to 6.0V range. Typical efficiencies are greater than 85%. Typical quiescent supply current is 25µA (1µA in shutdown). The MAX856-MAX859 combine ultra-low quiescent supply current and high efficiency to give maximum battery life. An internal MOSFET power transistor permits high switching frequencies. This benefit, combined with internally set peak inductor current limits, permits the use of small, low-cost inductors. The MAX856/MAX857 have a 500mA peak inductor current limit. The MAX858/MAX859 have a 125mA peak inductor current limit.

关键特性

0.8V to 6.0V Input Supply Voltage
0.8V Typ Start-Up Supply Voltage
85% Efficiency at 100mA
25µA Quiescent Current
1µA Shutdown Mode
125mA and 500mA Switch-Current Limits Permit Use of Low-Cost Inductors
Up to 500kHz Switching Frequency
±1.5% Reference Tolerance Over Temperature
Low-Battery Detector (LBI/LBO)
8-Pin SO and µMax Packages

MAX856、MAX857、MAX858、MAX859：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	MAX856-MAX859.pdf	Rev 4; 05/1996

关键参数

Part Number	V_IN (V)	V_IN (V)	V_OUT1 (V)	V_OUT1 (V)	Preset V_OUT (V)	I_OUT1 (A)	Output Adjust. Method	Switch Type	Power Good Signal	I_CC (mA)	Shutdown Mode Supply Current (µA)	Shutdown Mode Supply Current (µA)	DC-DC Outputs	Oper. Freq. (kHz)	Package/Pins	Budgetary Price
Part Number	min	max	min	max	Preset V_OUT (V)	max	Output Adjust. Method	Switch Type	Power Good Signal	typ	typ	max	DC-DC Outputs	Oper. Freq. (kHz)	Package/Pins	See Notes
MAX856	0.8	6	3.3	5	3.3 5	0.15	Preset	Internal	Yes	0.025	1	5	1	500	µMAX/8 PDIP(N)/8 SOIC(N)/8	$2.30 @1k
MAX857			2.7	6	-	0.15	Resistor								µMAX/8 PDIP(N)/8 SOIC(N)/8	$2.30 @1k
MAX858			3.3	5	3.3 5	0.06	Preset								µMAX/8 PDIP(N)/8 SOIC(N)/8	$2.30 @1k
MAX859			2.7	6	-	0.06	Resistor								µMAX/8 PDIP(N)/8 SOIC(N)/8	$2.38 @1k

开发工具

MAX856EVKIT

订购型号

型号	状况	推荐替代产品	封装	温度	RoHS/无铅
MAX857C/D	停止供货		DICE SALES,；NA引脚；DICE；	0°C至+70°C	参考数据资料
MAX857CPA	停止供货	MAX857CSA	PDIP(N),；8引脚；79.7mm²	0°C至+70°C	RoHS/无铅：否
MAX857CSA	停止供货	MAX857CSA+	SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：否
MAX857CSA+	生产中		SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：无铅
MAX857CSA+T	生产中		SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：无铅
MAX857CSA-T	停止供货	MAX857CSA+T	SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：否
MAX857CUA	停止供货		µMAX,；8引脚；15.6mm²	0°C至+70°C	RoHS/无铅：否
MAX857CUA-T	停止供货		µMAX,；8引脚；15.6mm²	0°C至+70°C	RoHS/无铅：否
MAX857EPA	停止供货		PDIP(N),；8引脚；79.7mm²	-40°C至+85°C	RoHS/无铅：否
MAX857ESA	停止供货	MAX857ESA+	SOIC(N),；8引脚；30.9mm²	-40°C至+85°C	RoHS/无铅：否
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？
MAX857ESA+	生产中		SOIC(N),；8引脚；30.9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX857ESA+T	生产中		SOIC(N),；8引脚；30.9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX857ESA-T	停止供货	MAX857ESA+T	SOIC(N),；8引脚；30.9mm²	-40°C至+85°C	RoHS/无铅：否

MAX856-MAX859.pdf MAX859

典型工作电路 MAX859