LM25117
- LM25117-Q1 is Qualified for Automotive Applications
- AEC-Q100
Qualified With the Following Results:
- Device Temperature Grade 1: -40°C to 125°C Ambient Operating Temperature Range
- Emulated Peak Current Mode Control
- Wide Operating Range from 4.5 V to 42 V
- Robust 3.3 A Peak Gate Drives
- Adaptive Dead-time Output Driver Control
- Free-run or Synchronizable Clock up to 750 kHz
- Optional Diode Emulation Mode
- Programmable Output from 0.8 V
- Precision 1.5% Voltage Reference
- Analog Current Monitor
- Programmable Current Limit
- Hiccup Mode Over Current Protection
- Programmable Soft-start and Tracking
- Programmable Line Undervoltage Lockout
- Programmable Switch-over to External Bias Supply
- Thermal Shutdown
The LM25117 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.
The operating frequency is programmable from 50 kHz to 750 kHz. The LM25117 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator that allows external bias supply further improves efficiency. The LM25117’s unique analog telemetry feature provides average output current information. Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout.
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 | LM25117/Q1 Wide Input Range Synchronous Buck Controller With Analog Current Monitor 数据表 (Rev. F) | PDF | HTML | 2015-8-27 | ||
| 白皮书 | Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) | 2019-4-10 | ||||
| 选择指南 | 电源管理指南 2018 | 2018-7-31 | ||||
| 白皮书 | Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) | 2018-7-3 | ||||
| 应用手册 | How to Design a Simple Constant Current/Constant Voltage Buck Converter | 2018-6-26 | ||||
| 模拟设计期刊 | Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics | 2016-7-21 | ||||
| 模拟设计期刊 | 2015 年第 3 季度模拟应用期刊 | 英语版 | 2015-9-8 | |||
| 模拟设计期刊 | 在 DC/DC 转换器中采用陶瓷或电解输出电容器 － 为什么不能兼用呢？ | 英语版 | 2015-9-8 |
设计与开发
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LM25117EVAL — LM25117 评估板
The LM25117 evaluation board provides the design engineer with a fully functional synchronous buck converter based on Emulated Current Mode Control to evaluate the LM25117 controller IC. The evaluation board provides 3.3V output with a 9A current capability in addition with average output current (...)
LM25117-5117QUICK-CALC — LM(2)5117 快速入门计算器
PMP10509 — 432W 高效率单相同步降压转换器参考设计
PMP10509 是一款使用 LM25117 控制器 IC 的高效单相同步降压转换器。此设计的输入电压范围为 30.4Vin 至 33.6Vin（标称 32Vin），可提供 24Vout 输出电压，能够为负载提供 18A 的连续电流。
PMP10514 — 300W 高效率单相同步降压转换器参考设计
PMP10514 是一款使用 LM25117 控制器 IC 的高效单相同步降压转换器。此设计的输入电压范围为 30.4Vin 至 33.6Vin（标称 32Vin），可提供 20Vout 输出电压，能够为负载提供 15A 的连续电流。
PMP11114 — 汽车输入双端口 USB Type C 充电器参考设计
PMP11114 是一款双端口 USB Type C 充电器。此设计采用汽车输入电压（7V 至 18V 标称值，负载突降至 40V）。 输出连接到两个 USB Type 端口，这些端口中的每一个都提供 5V 电压。 该设计在一个端口上支持 3A，在另一个端口上支持 1.5A。 该设计的直流/直流部分的额定总电流为 5A。 该设计完全兼容 USB Type C，并向后兼容 BC1.2 和 DCP 配置。
| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| WQFN (RTW) | 24 | Ultra Librarian |
| HTSSOP (PWP) | 20 | Ultra Librarian |
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