MAX649:5V/3.3V/3V或可调、高效率、低IQ、降压型DC-DC控制器

在较宽负载范围内具有低电源电流、高转换效率

The MAX649/MAX651/MAX652 BiCMOS, step-down DC-DC switching controllers provide high efficiency over three decades of load current. A unique, current-limited pulse-frequency-modulated (PFM) control scheme gives these devices the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using only 100µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over loads ranging from 10mA to more than 2.5A. These devices use miniature external components. Their high switching frequency (up to 300kHz) allows for less than 9mm diameter surface-mount inductors. The MAX649/MAX651/MAX652 have dropout voltages less than 1V and accept input voltages up to 16.5V. Output voltages are preset at 5V (MAX649), 3.3V (MAX651), and 3V (MAX652). These controllers can also be adjusted to any voltage from 1.5V to the input voltage by using two resistors. These step-down controllers drive external P-channel MOSFETs at loads greater than 10W. If less power is required, use the MAX639/MAX640/MAX653 step-down converters with on-chip FETs, which allow up to a 225mA load current.

关键特性
  • More than 90% Efficiency (10mA to 1.5A Loads)
  • More than 12.5W Output Power
  • 100µA Max Quiescent Supply Current
  • 5µA Max Shutdown Supply Current
  • Less than 1.0V Dropout Voltage
  • 16.5V Max Input Voltage
  • 5V (MAX649), 3.3V (MAX651), 3V (MAX652), or Adjustable Output Voltage
  • Current-Limited Control Scheme
  • Up to 300kHz Switching Frequency
MAX649、MAX651、MAX652:典型工作电路
MAX649、MAX651、MAX652:典型工作电路
应用
  • 5V至3.3V绿色PC应用
  • 电池供电应用
  • 高效降压转换器
  • 元件数最少的DC-DC转换器
数据手册DataSheet
语言下载文件备注
英文MAX649-MAX652.pdfRev 3; 08/1997
关键参数
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX649416.51.516.55
  • Preset
  • Resistor
2.5External1300
  • CDIP(N)/8
  • PDIP(N)/8
  • SOIC(N)/8
-
MAX6513.3
  • CDIP(N)/8
  • PDIP(N)/8
  • SOIC(N)/8
$2.74 @1k
技术资料
质量和环境数据
相关产品
  • MAX639:5V/3.3V/3V/可调、高效率、低IQ、降压型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
MAX649CPA停止供货PDIP(N),;8引脚;79.7mm²0°C至+70°CRoHS/无铅:否
MAX649CSA停止供货SOIC(N),;8引脚;30.9mm²0°C至+70°CRoHS/无铅:否
MAX649CSA+停止供货SOIC(N),;8引脚;30.9mm²0°C至+70°CRoHS/无铅:无铅
MAX649CSA+T停止供货SOIC(N),;8引脚;30.9mm²0°C至+70°CRoHS/无铅:无铅
MAX649CSA-T停止供货N.SO;8引脚0°C至+70°C参考数据资料
MAX649EPA停止供货PDIP(N),;8引脚;79.7mm²-40°C至+85°CRoHS/无铅:否
MAX649EPA+停止供货PDIP(N),;8引脚;79.7mm²-40°C至+85°CRoHS/无铅:无铅
MAX649ESA停止供货MAX649ESA+SOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:否
MAX649ESA+生产中SOIC(N),;8引脚;30.9mm²-40°C至+85°CRoHS/无铅:无铅
MAX649ESA+T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?
MAX649ESA-T停止供货MAX649ESA+TN.SO;8引脚-40°C至+85°C参考数据资料
MAX649MJA停止供货CDIP(N),;8引脚;82.6mm²-55°C至+125°CRoHS/无铅:否
MAX649-MAX652.pdf MAX651
Energy Management for Small Portable Systems MAX604
MAX649.pdf MAX649