LM34919
- Integrated N-Channel buck switch
- Integrated start-up regulator
- Input Voltage Range: 8V to 40V
- No loop compensation required
- Ultra-Fast transient response
- Operating frequency remains constant with load current and input voltage
- Maximum switching frequency: 2.0 MHz
- Maximum Duty Cycle Limited During Start-Up
- Adjustable output voltage
- Valley Current Limit At 0.64A
- Precision internal reference
- Low bias current
- Highly efficient operation
- Thermal shutdown
- 10-Pin DSBGA Package
The LM34919 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying 0.6A to the load. This buck regulator contains an N-Channel Buck Switch, and is available in a 10-pin DSBGA package. The constant on-time 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 lockout, thermal shutdown, gate drive under-voltage lockout, and maximum duty cycle limiter.
技术文档
| 顶层文档 | 类型 | 标题 | 格式选项 | 下载最新的英语版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 数据表 | LM34919 Ultra Small 40V, 600 mA Constant On-Time Buck Switching Regulator 数据表 (Rev. E) | 2013-2-19 | |||
| 选择指南 | 电源管理指南 2018 | 2018-7-31 |
设计与开发
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LM34919EVAL — 用于 LM34919 的评估板
The LM34919 evaluation board provides the design engineer with a fully functional buck regulator, employing the constant on time (COT) operating principle. This evaluation board provides a 5V output over an input range of 8V to 40V. The circuit delivers load currents to 600 mA, with current limit (...)
| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| DSBGA (YPA) | 10 | Ultra Librarian |