LM34914
- Input Voltage Range: 8V to 40V
- Integrated N-Channel Buck Switch
- Valley Current Limit Varies with VIN and VOUT to Reduce Excessive Inductor Current
- On-time is Reduced when in Current Limit
- Integrated Start-Up Regulator
- No Loop Compensation Required
- Ultra-Fast Transient Response
- Maximum Switching Frequency: 1.3 MHz
- Operating Frequency Remains Nearly Constant with Load Current and Input Voltage Variations
- Programmable Soft-Start
- Precision Internal Reference
- Adjustable Output Voltage
- Thermal Shutdown
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The LM34914 Step-Down Switching Regulator features all the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying at least 1.25A to the load. To reduce excessive switch current due to the possibility of a saturating inductor the valley current limit threshold changes with input and output voltages, and the on-time is reduced when current limit is detected. This buck regulator contains a 44V N-Channel Buck Switch, and is available in the thermally enhanced 3 mm x 3 mm WSON-10 package. The feedback regulation scheme requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The valley current limit results in a smooth transition from constant voltage to constant current mode when current limit is detected, reducing the frequency and output voltage, without the use of foldback. Additional features include: VCC under-voltage lock-out, thermal shutdown, gate drive under-voltage lock-out, and maximum duty cycle limit.
技术文档
类型 | 标题 | 下载最新的英语版本 | 日期 | |||
---|---|---|---|---|---|---|
* | 数据表 | LM34914 Ultra Small 1.25A Step-Dwn Switching Reg w/Intelligent Current Limit 数据表 (Rev. B) | 2013年 3月 21日 | |||
EVM 用户指南 | AN-1549 LM34914 Evaluation Board (Rev. B) | 2013年 4月 25日 |
设计和开发
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封装 | 引脚 | 下载 |
---|---|---|
WSON (DSC) | 10 | 查看选项 |
订购和质量
- RoHS
- REACH
- 器件标识
- 引脚镀层/焊球材料
- MSL 等级/回流焊峰值温度
- MTBF/时基故障估算
- 材料成分
- 鉴定摘要
- 持续可靠性监测
- 制造厂地点
- 封装厂地点