STMicroelectronics L4971降压型单片式电源开关稳压器
STMicroelectronics L4971降压型单片式电源开关稳压器具有1.5A输出电流，输出电压可在3.3V至50V范围内调节。通过简单的外部分压器来选择电压。L4971采用RDSON典型值为0.25Ω的内部功率D-MOS晶体管。这样可实现极高的效率和开关速度以及高达300KHz的开关频率。必须遵守封装的最大功耗。由于该器件具有8V至55V的宽输入电压范围以及3.3V至50V的可调输出电压范围，因此适用于当今的大部分应用。
特性
- Up to 1.5a step down converter
- Operating input voltage from 8V to 55V
- Precise 3.3V (±1%) internal reference voltage
- Output voltage adjustable from 3.3V to 50V
- Switching frequency adjustable up to 300kHz
- Zero load current operation
- Voltage feed-forward
- Internal current limiting (pulse by pulse and hiccup mode)
- Inhibit for zero current consumption
- Protection against feedback disconnection
- Thermal shutdown
- Soft-start function
Block Diagram
Development Tool
发布日期: 2017-11-06
| 更新日期: 2022-06-20