LM5121
- AEC-Q100 Qualified with the following results:
- Device Temperature Grade 1: –40°C to +125°C
Ambient Operating Temperature Range - Device HBM ESD Classification Level 2
- Device CDM ESD Classification Level C6
- Device Temperature Grade 1: –40°C to +125°C
- Maximum Input Voltage: 65 V
- Min Input Voltage: 3.0 V (4.5 V for startup)
- Output Voltage Up to 100 V
- Bypass (VOUT = VIN) Operation
- 1.2-V Reference with ±1.0% Accuracy
- Free-Run/Synchronizable up to 1 MHz
- Peak Current Mode Control
- Robust Integrated 3-A Gate Drivers
- Adaptive Dead-Time Control
- Optional Diode Emulation Mode
- Programmable Cycle-by-Cycle Current Limit
- Programmable Line UVLO
- Programmable Soft-Start
- Thermal Shutdown Protection
- Low Shutdown Quiescent Current: 9 µA
- Programmable Slope Compensation
- Programmable Skip Cycle Mode Reduces
Standby Power - Supports External VCC Bias Supply Option
- Load Disconnection in Shutdown Mode (True
Shutdown) - Inrush Current Limiting
- Hiccup Mode Short Circuit/Overload Protection
- Circuit Breaker Function
- Capable of Input Transient Suppression
- Capable of Reverse Battery Protection
- Thermally Enhanced 20-Pin HTSSOP
The LM5121 is a synchronous boost controller intended for high-efficiency, high-power boost regulator applications. The control method is based upon peak current mode control. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation.
The switching frequency is programmable up to 1 MHz. Higher efficiency is achieved using two robust N-channel MOSFET gate drivers with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions.
The LM5121 provides disconnection switch control which completely disconnects the output from the input during an output short or a shutdown condition. During start-up sequence, inrush current is limited by the disconnection switch control.
An internal charge pump allows 100% duty cycle operation of the high-side synchronous switch (Bypass operation). Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout.
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 | LM5121/-Q1 Wide Input Synchronous Boost Controller with Disconnection Switch Control datasheet (Rev. C) | PDF | HTML | 2016/6/14 | ||
| 類比設計期刊 | Designing the front-end DC/DC conversion stage to withstand automotive transient | 2017/1/18 | ||||
| 應用說明 | Designing Fault Protection Circuits Using Wide VIN LM5121 | 2015/1/12 | ||||
| 白皮書 | How to design boost, SEPIC or flyback regulators with wide VIN power ICs | 2014/7/29 | ||||
| 應用說明 | Practical Feedback Loop Analysis for Current-Mode Boost Converter | 2014/3/7 | ||||
| 應用說明 | Automated Frequency Response Analyzer | 2013/10/9 |
設計與開發
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LM5121EVM — 具有中斷連線切換的廣泛 Vin 同步升壓控制器評估模組
PMP11422 — 高密度 72W 電池供電同步升壓參考設計
PMP11422 是使用 LM5121 控制器的同步升壓電源供應器。此設計接受 5Vin 至 8.6Vin 的輸入電壓，並升壓至可提供 6A 連續電流的 12Vout 電壓軌。LM5121 整合輸入斷開開關功能，可提供升壓短路保護，裝置會在發生短路事件時關閉開關。
PMP8673 — 採用 LM5121 的 150W 升壓轉換器參考設計
PMP8673 參考設計為針對高效率進行最佳化，同時維持精巧外型尺寸的同步升壓轉換器。此參考設計具有 34.5-37.5V（額定值為 35V）的電壓輸入範圍，並提供 55.5V 的輸出電壓。同步升壓拓撲在 2-3A 負載範圍內實現了高於 97% 的效率。切換頻率設定為 400kHz，允許使用較小的外部元件和總面積小於 60 平方公分的電路板。
PMP9297 — 適用於 GaN 音訊應用的 150W 雙通道同步升壓
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| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| HTSSOP (PWP) | 20 | Ultra Librarian |
訂購與品質
建議產品可能具有與此 TI 產品相關的參數、評估模組或參考設計。