MAX776:-5V/-12V/-15V或可调、高效率、低IQ、反相、DC-DC控制器

负压LCD偏置电源,可产生极高的负电源电压,输出电流高达1A

The MAX774/MAX775/MAX776 inverting switching regulators deliver high efficiency over three decades of load current. A unique current-limited, pulse-frequency modulated (PFM) control scheme provides the benefits of pulse-width modulation (high efficiency with heavy loads), while using less than 100µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads. These ICs also use tiny external components; their high switching frequency (up to 300kHz) allows for less than 5mm diameter surface-mount magnetics. The MAX774/MAX775/MAX776 accept input voltages from 3V to 16.5V, and have preset output voltages of -5V, -12V, and -15V, respectively. Or, the output voltage can be user-adjusted with two resistors. Maximum VIN - VOUT differential voltage is limited only by the break-down voltage of the chosen external switch transistor. These inverters use external P-channel MOSFET switches, allowing them to power loads up to 5W. If less power is required, use the MAX764/MAX765/MAX766 inverting switching regulators with on-board MOSFETs.

关键特性
  • 85% Efficiency for 5mA to 1A Load Currents
  • Up to 5W Output Power
  • 100µA (max) Supply Current
  • 5µA (max) Shutdown Current
  • 3V to 16.5V Input Range
  • -5V (MAX774), -12V (MAX775), -15V (MAX776), or Adjustable Output Voltage
  • Current-Limited PFM Control Scheme
  • 300kHz Switching Frequency
功能框图
MAX774、MAX775、MAX776:典型工作电路
产品应用
  • 电池供电应用
  • 数据通信
  • 高效DC-DC转换器
  • LCD偏置发生器
关键参数
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
IOUT1
(A)
Output Adjust. MethodDC-DC OutputsOper. Freq.
(kHz)
Switch TypePackage/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX774316.50-100-5.01Resistor1300External
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
$2.42 @1k
MAX775-12
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
$2.42 @1k
MAX776-15
CDIP(N)/8
PDIP(N)/8
SOIC(N)/8
$2.37 @1k
数据手册DataSheet
英文MAX774-MAX776.pdfRev 2; 04/2003
开发工具
订购型号
型号状况推荐替代产品封装温度RoHS/无铅
MAX776C/D停止供货DICE SALES,;NA引脚;DICE;参考数据资料
MAX776CPA停止供货MAX776CPA+PDIP(N),;8引脚;79.7mm²0°C至+70°CRoHS/无铅:否
MAX776CPA+生产中PDIP(N),;8引脚;79.7mm²0°C至+70°CRoHS/无铅:无铅
MAX776CSA生产中SOIC(N),;8引脚;30.9mm²0°C至+70°CRoHS/无铅:否
MAX776CSA+生产中SOIC(N),;8引脚;30.9mm²0°C至+70°CRoHS/无铅:无铅
MAX776CSA+T生产中SOIC(N),;8引脚;30.9mm²0°C至+70°CRoHS/无铅:无铅
MAX776CSA-T停止供货MAX776CSA+TN.SO;8引脚0°C至+70°C参考数据资料
MAX776EPA停止供货PDIP(N),;8引脚;79.7mm²-40°C至+85°CRoHS/无铅:否
MAX776ESA最后一次购买MAX776ESA+SOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:否
MAX776ESA+生产中SOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/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?
MAX776ESA+T生产中SOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX776ESA-T停止供货MAX776ESA+TN.SO;8引脚-40°C至+85°C参考数据资料
MAX776MJA停止供货CDIP(N),;8引脚;82.6mm²-55°C至+125°CRoHS/无铅:否
MAX774-MAX776.pdf MAX776
MAX774-MAX776.pdf MAX776