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
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.pdfRev 2; 06/2002
关键参数
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
IOUT1
(A)
Output Adjust. MethodSwitch TypeICC
(mA)
Shutdown Mode Supply Current
(µA)
DC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxmaxtypmaxSee Notes
MAX1771216.52100122
  • Preset
  • Resistor
External0.08551300
  • CDIP(N)/8
  • PDIP(N)/8
  • SOIC(N)/8
$1.91 @1k
开发工具
技术资料
质量和环境数据
相关产品
  • MAX1771:12V或可调、高效率、低IQ、升压型DC-DC控制器
  • MAX756:3.3V/5V/可调输出、升压型DC-DC转换器
  • MAX608:5V或可调、低电压、升压型DC-DC控制器
  • MAX761:12V/15V或可调、高效率、低IQ、升压型DC-DC转换器
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;79.7mm²0°C至+70°CRoHS/无铅:否
MAX1771CPA+生产中PDIP(N),;8引脚;79.7mm²0°C至+70°CRoHS/无铅:无铅
MAX1771CPA+T生产中PDIP(N),;8引脚;79.7mm²0°C至+70°CRoHS/无铅:无铅
MAX1771CSA停止供货MAX1771CSA+SOIC(N),;8引脚;30.9mm²0°C至+70°CRoHS/无铅:否
MAX1771CSA+生产中SOIC(N),;8引脚;30.9mm²0°C至+70°CRoHS/无铅:无铅
MAX1771CSA+T生产中SOIC(N),;8引脚;30.9mm²0°C至+70°CRoHS/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+TSOIC(N),;8引脚;30.9mm²0°C至+70°CRoHS/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;30.9mm²0°C至+70°CRoHS/无铅:否
MAX1771EPA停止供货MAX1771EPA+PDIP(N),;8引脚;79.7mm²-40°C至+85°CRoHS/无铅:否
MAX1771EPA+生产中PDIP(N),;8引脚;79.7mm²-40°C至+85°CRoHS/无铅:无铅
MAX1771ESA停止供货MAX1771ESA+SOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:否
MAX1771ESA+生产中SOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX1771ESA+T生产中SOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX1771ESA-T停止供货MAX1771ESA+TSOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:否
MAX1771MJANRNDCDIP(N),;8引脚;82.6mm²-55°C至+125°CRoHS/无铅:否
MAX1771MPA/PR停止供货PDIP(N),;8引脚;79.7mm²-55°C至+125°CRoHS/无铅:否
MAX1771MPA/PR+生产中PDIP(N),;8引脚;79.7mm²-55°C至+125°CRoHS/无铅:无铅
MAX1771.pdf MAX1771
MAX1771.pdf MAX1771
MAX1771.pdf MAX1771
Two AA Cells Produce Huge Audio Volume MAX1771
Pushbuttons Control Regulated Switching Converter MAX5160
Circuit Connection Adds Current-Mode Operation to PFM Boost Converters MAX933
Step-Up Controller Forms Negative Step-Down Regulator MAX668
Negative Buck Regulator Employs Step-Up Controller MAX1771
Energy Management for Small Portable Systems MAX604
Boost DC-DC Voltage Regulator Converts To Current Source for Battery Charging MAX1771
MAX1771.pdf MAX1771
典型工作电路 MAX1771