LM25085A
- Wide 4.5V to 42V Input Voltage Range
- Adjustable Current Limit using RDS(ON) or a Current Sense Resistor
- Programmable Switching Frequency to 1MHz
- No Loop Compensation Required
- Ultra-Fast Transient Response
- Nearly Constant Operating Frequency with Line and Load Variations
- Adjustable Output Voltage from 0.9V
- Precision ±2% Feedback Reference
- Capable of 100% Duty Cycle Operation
- Internal Soft-Start Timer
- Integrated High Voltage Bias Regulator
- Thermal Shutdown
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The LM25085A is a functional variant of the LM25085 COT PFET Buck Switching Controller. The functional differences of the LM25085A are: The feedback reference voltage is 0.9V, the forced off-time after current limit detection is longer, and the soft-start time is shorter (1.8 ms).
The LM25085A is a high efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, efficient buck regulator for a wide range of applications. This high voltage controller contains a PFET gate driver and a high voltage bias regulator which operates over a wide 4.5V to 42V input range. The constant on-time regulation principle requires no loop compensation, simplifies circuit implementation, and results in ultra-fast load transient response. The operating frequency remains nearly constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The PFET architecture allows 100% duty cycle operation for a low dropout voltage. Either the RDS(ON) of the PFET or an external sense resistor can be used to sense current for over-current detection.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | 42V Constant On-Time PFET Buck Switching Controller with 0.9V Reference datasheet (Rev. B) | 2013/3/6 | |||
| 選擇指南 | Power Management Guide 2018 (Rev. R) | 2018/6/25 | ||||
| 類比設計期刊 | Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics | 2016/7/21 | ||||
| 應用說明 | Constant Current Constant Voltage Buck Converter w/LM25085 (Rev. A) | 2013/4/23 |
設計與開發
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LM25085AMYEEVAL — 具 0.9V 參考的 LM25085AMYEEVAL 42V 恆定導通時間 PFET 降壓開關控制器
The LM25085AMYE evaluation board provides the design engineer with a fully functional buck regulator, employing the LM25085A PFET switching controller which uses the constant on-time (COT) operating principle. This evaluation board provides a 1V output over an input range of 4.5V to 24V. The (...)
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| HVSSOP (DGN) | 8 | Ultra Librarian |
| VSSOP (DGK) | 8 | Ultra Librarian |
| WSON (NGQ) | 8 | Ultra Librarian |
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