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


点击查看特定型号的库存状况。

说明

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.
MAX649、MAX651、MAX652:典型工作电路 MAX649、MAX651、MAX652:典型工作电路 放大+

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

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

请查看具体的参数规格 Step-Down Switching Regulators (404)


Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
IOUT1
(A)
Switch TypeOper. Freq.
(kHz)
FeaturesPackage/PinsBudgetary
Price
minmaxminmaxmaxSee Notes
MAX651 416.51.516.52.5External300Current Limit
DICE SALES/N
SOIC (N)/8
$2.24 @1k

Pricing Notes:
价格仅供参考,用于同类产品的比较。所提供报价为美元,需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题,请参考:价格与供货网站或与指定代理商联系。

技术资料

设计指南 671 Energy Management for Small Portable Systems
产品可靠性报告: MAX649.pdf 
型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C   Material Composition  

备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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类型 编号 标题
设计指南 671 Energy Management for Small Portable Systems