回到顶部

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

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
Output Adjust. Method Preset
Resistor
Power Good Signal Yes
# DC-DC Outputs 1
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
1.73
缩小

简化框图

Technical Docs

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心

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
Output Adjust. Method Preset
Resistor
Power Good Signal Yes
# DC-DC Outputs 1
Package/Pins PDIP/8
SOIC (N)/8
Budgetary
Price (See Notes)
1.73

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

Technical Docs

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心