LM51770
- Wide input range from 3.5V
to 78V (85V absolute maximum)
- Minimum 2.8V when V(BIAS) > 3.5V
- Output voltage from 3.3V to 78V
- Low shutdown IQ of 3µA
- Low operating IQ of 60µA
- 3% reverse current limit accuracy for precise charging currents
- Average input and output current monitor or limiter
- Dynamic output voltage tracking for PWM or analog input signals
- Power save mode (PSM) selectable for high light load efficiency
- Two integrated high-voltage supply LDOs with automatic selection
- Fixed frequency across all
operating modes (boost, buck-boost, buck)
- Forced PWM mode selectable
- Switching up to 1.8MHz for small solution and component size
- External clock synchronization
- Spread spectrum operation selectable
- Adjustable undervoltage protection
- Hiccup overcurrent and short protection
The LM51770x is a four switch buck-boost controller. The device provides a regulated output voltage if the input voltage is higher, equal, or lower than the adjusted output voltage. In power save mode, the device supports high efficiency with low output loads due to its low quiescence currents. In power save mode, the device supports high efficiency close to 99% efficiency over the full range of the output current. The LM51770x runs at a fixed switching frequency, which is set through the RT or SYNC pin. The switching frequency remains the same during buck, boost, and buck-boost operation. The integrated and optional average current monitor helps monitor and limit input and output current of the LM51770x. This feature also supports charging backup power elements, like batteries or capacitors, with constant current (CC) and constant voltage (CV).
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 | LM51770x 78V Wide VIN Bidirectional 4-Switch Buck-Boost Controller datasheet (Rev. A) | PDF | HTML | 2025/8/20 | ||
| Application brief | Current Monitoring with Positive and Negative Currents on LM5177x Devices (Rev. A) | PDF | HTML | 2024/11/25 | |||
| 應用說明 | Reverse Current Operation of the LM5177 Buck-Boost Converter | PDF | HTML | 2024/7/16 | |||
| 應用說明 | Parallel Operation of the Buck-Boost Converters Using LM5177 Buck-Boost Controller (Rev. A) | PDF | HTML | 2024/2/27 | |||
| Application brief | A Simple Constant Voltage Regulation Using the MODE Pin (Rev. A) | PDF | HTML | 2024/2/15 | |||
| Application brief | Precise Current Limiter Over Wide Operation Voltages in Buck-Boost Converters | PDF | HTML | 2023/9/5 | |||
| 應用說明 | Layout Optimization of 4-Switch Buck-Boost Converters | PDF | HTML | 2023/9/5 | |||
| Application brief | Dynamic Current Tracking With the LM5177 4-Switch Buck Boost Controller | PDF | HTML | 2023/2/24 | |||
| Application brief | Constant Current Operation Using the Internal Current Limiter | PDF | HTML | 2023/1/27 |
設計與開發
如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。
LM51770EVM-HV — LM51770 降壓升壓控制器評估模組
LM5177EVM-HP — 具四開關降壓升壓控制器的 LM5177 評估模組
LM51770-QUICKSTART-CALC — LM51770x BuckBoost Quickstart Calculator Tool
PMP23377 — 四開關降壓升壓 DC/DC 轉換器參考設計
PMP41155 — 開放式運算專案® (OCP)、開放式機架 V3 12KW 電源電池備援單元 (BBU) 設計
此參考設計為四開關、降壓升壓 DC/DC 轉換器，用於電池備援單元 (BBU) 應用，符合開放式運算計畫（Open Compute Project®，OCP）開放式機架 V3 電源 BBU 規範。此設計具備 12KW 功率能力。轉換器可根據 Vin 和 Vout 電壓，以降壓、降壓升壓或升壓模式運作。轉換器在各模式之間順暢暫態。此設計採用峰值電流模式控制，可提供快速負載暫態響應。憑藉 LM51770 的特性，場效電晶體不需要額外驅動器。此設計共有六個相位，其中六個相位會並聯以進行電池放電操作，提供高達 12KW 的放電功率。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| HTSSOP (DCP) | 38 | 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。