LM51231-Q1
- AEC-Q100 qualified for automotive applications
- Temperature grade 1: –40°C to +125°C, TA
- Functional Safety-Capable
- Suited for wide operating range automotive battery powered applications
- 3.8V to 42V input operating range
- Dynamically programmable VOUT from 5V to 20V, or from 15V to 57V
- Minimum boost input 0.8V when BIAS ≥ 3.8V
- Bypass operation when VSUPPLY > VLOAD
- BIAS shutdown current ≤ 3µA
- Small solution size
- Maximum switching frequency 2.2MHz
- Internal boot diode
- QFN-20 with wettable flanks
- EMI mitigation and avoid AM band interference and crosstalk
- Optional clock synchronization
- Switching frequency from 100kHz to 2.2MHz
- Selectable switching mode (FPWM, diode emulation)
- Optional programmable spread spectrum
- Lead-less package
- Programmability and flexibility
- Dynamic VOUT tracking
- Dynamic switching frequency programming
- Supports DCR inductor current sensing
- Programmable input voltage UVLO
- Adjustable soft start
- Adaptive dead-time
- PGOOD indicator
- Integrated protection features
- Constant cycle-by-cycle peak current limit over VSUPPLY
- Overvoltage protection
- HB-SW short protection
- Thermal shutdown
The LM51231-Q1 device is a wide input range synchronous boost controller that employs peak current mode control. The device’s wide input range supports automotive cold-crank and load dump. The minimum input voltage can be as low as 0.8V when BIAS is equal to or greater than 3.8V. The output voltage can be dynamically programmed by using the tracking function. Bypass mode operation is automatically entered when VSUPPLY > VLOAD, eliminating the body diode drop of the high-side MOSFET. The switching frequency is dynamically programmed with an external resistor from 100kHz to 2.2MHz. Switching at 2.2MHz minimizes AM band interference and allows a small solution size and fast transient response.
The device has built-in protection features such as peak current limit, which is constant over VSUPPLY, overvoltage protection, and thermal shutdown. External clock synchronization, programmable spread spectrum modulation, and a lead-less package with minimal parasitic, help to reduce EMI and avoid cross talk. Additional features include line UVLO, FPWM, diode emulation, DCR inductor current sensing, programmable soft start, and a power-good indicator
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 | LM51231-Q1 2.2MHz Wide VIN Synchronous Boost Controller with VOUT Tracking datasheet (Rev. A) | PDF | HTML | 2025/11/6 | ||
| 功能安全資訊 | LM51231-Q1 Functional Safety FIT Rate, FMD and Pin FMA | PDF | HTML | 2022/9/13 |
設計與開發
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此 EVM 旨在簡化配置，讓使用者能夠在同一模組上評估多種不同應用。功能包括：低 IQ 操作、內部回饋電阻、當 VIN 大於 VOUT 時的旁路模式操作、動態輸出電壓追蹤、電源良好 (PGOOD) 指示器、可編程頻率抖動、可編程欠電壓鎖定 (UVLO) 及過電壓保護。
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TIDA-020033-TD-DESIGN — TIDA-020033 測試文件
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此參考設計展示 H 類音訊與追蹤電源供應音訊子系統。TAS6584-Q1 音訊放大器可追蹤數位音訊輸入的包絡線，並調整 LM5123-Q1 升壓輸出電壓以符合電源效率需求，無需使用外部微控制器。此參考設計可提升效率、熱性能，且總體積更小。此外，此參考設計也允許 H 類實作隨插即用，對汽車音訊架構的其他部分只有最少的軟體更動。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VQFN (RGR) | 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。