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5V/3.3V/3V/可调、高效率、低IQ、降压型DC-DC转换器

在较宽负载范围内具有低电源电流、高转换效率

产品详情

主要特征

应用/用途

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4
VIN (V) (max) 11.5
VOUT1 (V) (min) 1.3
VOUT1 (V) (max) 11.5
IOUT1 (A) (max) 0.225
Switch Type Internal
Preset VOUT (V) 3.3
Output Adjust. Method Preset
Resistor
Power Good Signal Yes
# DC-DC Outputs 1
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
3.55
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技术文档

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参量

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 4
VIN (V) (max) 11.5
VOUT1 (V) (min) 1.3
VOUT1 (V) (max) 11.5
IOUT1 (A) (max) 0.225
Switch Type Internal
Preset VOUT (V) 3.3
Output Adjust. Method Preset
Resistor
Power Good Signal Yes
# DC-DC Outputs 1
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
3.55

主要特征

  • High Efficiency for a Wide Range of Load Currents
  • 10µA Quiescent Current
  • Output Currents Up to 225mA
  • Preset or Adjustable Output Voltage:
    • 5.0V (MAX639)
    • 3.3V (MAX640)
    • 3.0V (MAX653)
  • Low-Battery Detection Comparator
  • Current-Limiting PFM Control Scheme

应用/用途

  • 5V至3.3V转换
  • 9V电池至5V、3.3V或3V转换
  • 替代高效线性稳压器
  • 便携式仪表与手持终端

描述

The MAX639/MAX640/MAX653 step-down switching regulators provide high efficiency over a wide range of load currents, delivering up to 225mA. A current-limiting pulse-frequency-modulated (PFM) control scheme gives the devices the benefits of pulse-width-modulated (PWM) converters (high efficiency at heavy loads), while using only 10µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads.

The MAX639/MAX640/MAX653 input range is 4V to 11.5V, and the devices provide lower preset output voltages of 5V, 3.3V, and 3V, respectively. Or, the output can be user-adjusted to any voltage from 1.3V to the input voltage.

The MAX639/MAX640/MAX653 have an internal 1A power MOSFET switch, making them ideal for minimum-component, low- and medium-power applications. For increased output drive capability, use the MAX649/MAX651/MAX652 step-down controllers, which drive an external P-channel FET to deliver up to 5W.

简化框图

MAX639、MAX640、MAX653:典型工作电路 MAX639、MAX640、MAX653:典型工作电路 Zoom icon

技术文档

支持和培训

在Maxim的知识库中搜索技术问题的答案

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