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升/降压型DC-DC转换器,QSOP封装

紧凑的低噪声、无变压器升/降压调节器,仅使用一只电感,具有低输出纹波

产品详情

主要特征

应用/用途

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 1.8
VIN (V) (max) 11
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 0.26
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Power Good Signal Yes
# DC-DC Outputs 1
Package/Pins QSOP/16
Budgetary
Price (See Notes)
3.35
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参量

Parametric specs for Step-Down Switching Regulators
VIN (V) (min) 1.8
VIN (V) (max) 11
VOUT1 (V) (min) 1.25
VOUT1 (V) (max) 5.5
IOUT1 (A) (max) 0.26
Switch Type Internal
Preset VOUT (V) 5
Output Adjust. Method Preset
Resistor
Power Good Signal Yes
# DC-DC Outputs 1
Package/Pins QSOP/16
Budgetary
Price (See Notes)
3.35

主要特征

  • Step-Up/Down Voltage Conversion
  • 1.8V to 11V Input Range
  • 3.3V/5V or Adjustable Output Voltage Range
  • Output Current:
    • 300mA at 5V (VIN > 2.5V)
    • 150mA at 5V (VIN > 1.8V)
  • Smaller Inductor than SEPIC and Flybacks
  • Load Disconnects from Input in Shutdown
  • Supply Current from Battery:
    • 85µA (No-Load)
    • 0.1µA (Shutdown)
  • PGI/PGO-bar Low-Battery Comparator
  • 16-Pin QSOP Package (Same Footprint as 8-pin SO)
  • No External FETs Required
  • Thermal and Short-Circuit Protection

应用/用途

  • 2节至4节AA碱性电池供电的手持设备
  • 3.3V及其它低电压系统
  • 电池供电设备
  • 数码相机
  • 带有交流适配器输入的单节锂电池供电便携设备

描述

The MAX1672 integrates a step-up DC-DC converter with a linear regulator to provide step-up/down voltage conversion. This device provides a constant output voltage for inputs that vary above and below the output voltage. It has a 1.8V to 11V input range and a preset 3.3V or 5V output. The output can also be set from 1.25V to 5.5V using two resistors. Typical efficiency is 85%.

The MAX1672's step-up/linear-regulator configuration permits the use of a single, physically smaller inductor than can be used with competing SEPIC and flyback configurations. Switch current is also selectable, permitting the use of smaller inductors in low-current applications. The linear regulator also acts as a filter to reduce output ripple voltage.

The MAX1672 has a low 85µA quiescent supply current, which is further reduced to 0.1µA in logic-controlled shutdown. The output voltage is disconnected from the input in shutdown. The MAX1672 also has a PGI/PGO-bar low-battery detector.

The MAX1672 comes in a 16-pin QSOP package (same size as a standard 8-pin SO). For a larger device that delivers more output current, refer to the MAX710/MAX711. The preassembled MAX1672 evaluation kit is available to speed designs.

简化框图

MAX1672:典型工作电路 MAX1672:典型工作电路 Zoom icon

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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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