MAX1771：12V或可调、高效率、低IQ、升压型DC-DC控制器

低压输入时提供高效转换，降低噪声

The MAX1771 step-up switching controller provides 90% efficiency over a 30mA to 2A load. A unique current-limited pulse-frequency-modulation (PFM) control scheme gives this device the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using less than 110µA of supply current (vs. 2mA to 10mA for PWM converters). This controller uses miniature external components. Its high switching frequency (up to 300kHz) allows surface-mount magnetics of 5mm height and 9mm diameter. It accepts input voltages from 2V to 16.5V. The output voltage is preset at 12V, or can be adjusted using two resistors. The MAX1771 optimizes efficiency at low input voltages and reduces noise by using a single 100mV current-limit threshold under all load conditions. A family of similar devices, the MAX770-MAX773, trades some full-load efficiency for greater current-limit accuracy; they provide a 200mV current limit at full load, and switch to 100mV for light loads. The MAX1771 drives an external N-channel MOSFET switch, allowing it to power loads up to 24W. If less power is required, use the MAX756/MAX757 or MAX761/MAX762 step-up switching regulators with on-board MOSFETs. An evaluation kit is available.

关键特性

90% Efficiency for 30mA to 2A Load Currents
Up to 24W Output Power
110µA (max) Supply Current
5µA (max) Shutdown Current
2V to 16.5V Input Range
Preset 12V or Adjustable Output Voltage
Current-Limited PFM Control Scheme
Up to 300kHz Switching Frequency
Evaluation Kit Available

MAX1771：典型工作电路

应用

电池供电应用
闪存编程
大功率射频功放电源
掌上电脑/手持终端
便携式通信装置
LCD正偏置发生器

数据手册DataSheet

语言	下载文件	备注
英文	MAX1771.pdf	Rev 2; 06/2002

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	I_CC (mA)	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	typ	max	DC-DC Outputs	Oper. Freq. (kHz)	Package/Pins	See Notes
MAX1771	2	16.5	2	100	12	2	Preset Resistor	External	0.085	5	1	300	CDIP(N)/8 PDIP(N)/8 SOIC(N)/8	$1.91 @1k

开发工具

MAX1771EVKIT

技术资料

质量和环境数据

MAX1771.pdf

订购型号

型号	状况	推荐替代产品	封装	温度	RoHS/无铅
MAX1771C/D	生产中		DICE SALES,；NA引脚；DICE S；	0°C至+70°C	参考数据资料
MAX1771C/W+	停止供货		DICE SALES,；NA引脚；DICE；	0°C至+70°C	参考数据资料
MAX1771CPA	停止供货	MAX1771CPA+	PDIP(N),；8引脚；79.7mm²	0°C至+70°C	RoHS/无铅：否
MAX1771CPA+	生产中		PDIP(N),；8引脚；79.7mm²	0°C至+70°C	RoHS/无铅：无铅
MAX1771CPA+T	生产中		PDIP(N),；8引脚；79.7mm²	0°C至+70°C	RoHS/无铅：无铅
MAX1771CSA	停止供货	MAX1771CSA+	SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：否
MAX1771CSA+	生产中		SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：无铅
MAX1771CSA+T	生产中		SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：无铅
MAX1771CSA-G05	停止供货		N.SO；	0°C至+70°C	参考数据资料
MAX1771CSA-T	停止供货	MAX1771CSA+T	SOIC(N),；8引脚；30.9mm²	0°C至+70°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？
MAX1771CSA-TG05	停止供货		SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：否
MAX1771EPA	停止供货	MAX1771EPA+	PDIP(N),；8引脚；79.7mm²	-40°C至+85°C	RoHS/无铅：否
MAX1771EPA+	生产中		PDIP(N),；8引脚；79.7mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX1771ESA	停止供货	MAX1771ESA+	SOIC(N),；8引脚；30.9mm²	-40°C至+85°C	RoHS/无铅：否
MAX1771ESA+	生产中		SOIC(N),；8引脚；30.9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX1771ESA+T	生产中		SOIC(N),；8引脚；30.9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX1771ESA-T	停止供货	MAX1771ESA+T	SOIC(N),；8引脚；30.9mm²	-40°C至+85°C	RoHS/无铅：否
MAX1771MJA	NRND		CDIP(N),；8引脚；82.6mm²	-55°C至+125°C	RoHS/无铅：否
MAX1771MPA/PR	停止供货		PDIP(N),；8引脚；79.7mm²	-55°C至+125°C	RoHS/无铅：否
MAX1771MPA/PR+	生产中		PDIP(N),；8引脚；79.7mm²	-55°C至+125°C	RoHS/无铅：无铅