数据手册：MAX1672 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 .pdf [英文Rev.2(PDF,288kB)]
{状况：生产中。}
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.
产品关键特性
- 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
| 应用与使用范围
- 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
|
典型工作电路
芯片订购型号
| 订购型号 | 产品状态 | 封装形式 | 工作温度 | RoHS/无铅 |
| MAX1672C/D | 生产中 | DICESALES；NA引脚；DICE；封装信息 | | 参考数据资料 |
| MAX1672EEE | 生产中 | QSOP；16引脚；30.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1672EEE+ | 生产中 | QSOP；16引脚；30.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1672EEE+T | 生产中 | QSOP；16引脚；30.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1672EEE-T | 生产中 | QSOP；16引脚；30.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1672MEE/PR2 | 生产中 | QSOP；16引脚；30.9mm²封装信息 | -55°C至+125°C | RoHS/无铅：否材料分析 |
| MAX1672MEE/PR2-T | 生产中 | QSOP；封装信息 | -55°C至+125°C | 参考数据资料 |
功能接近器件
评估板与开发套件
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