設計工具
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
- 3.8-V to 42-V input operating range
- Dynamically programmable VOUT from 5 V to 20 V, or from 15 V to 57 V
- Minimum boost input 0.8 V when BIAS ≥ 3.8 V
- Bypass operation when VSUPPLY > VLOAD
- BIAS shutdown current ≤ 3 µA
- Small solution size
- Maximum switching frequency 2.2 MHz
- Internal boot diode
- QFN-20 with wettable flanks
- EMI mitigation and avoid AM band interference and crosstalk
- Optional clock synchronization
- Switching frequency from 100 kHz to 2.2 MHz
- 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 0.8 V when BIAS is equal to or greater than 3.8 V. 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 100 kHz to 2.2 MHz. Switching at 2.2 MHz 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
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檢視所有 2 | 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | LM51231-Q1 2.2-MHz Wide VIN Synchronous Boost Controller with VOUT Tracking datasheet | PDF | HTML | 2021年 11月 24日 |
| Functional safety information | LM51231-Q1 Functional Safety FIT Rate, FMD and Pin FMA | PDF | HTML | 2022年 9月 13日 |
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)。
開發板
LM5123EVM-BST — LM5123 升壓控制器評估模組
LM5123EVM-BST 評估模組展示 LM5123-Q1 寬輸入電壓同步升壓控制器的功能和性能。標準配置旨在提供 100W 下的 24V 穩壓輸出，輸入電壓為 9V 至 18V，開關頻率為 440 kHz。使用 LM5123-Q1 的 TRK 引腳，可將 100 W 下的輸出電壓動態修改為最高 45V。
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。
計算工具
LM5123-Q1-DESIGNCALC — LM5123-Q1 快速入門計算機
Welcome to the quickstart design tool for LM5123-Q1. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC boost converter based on the above controller. This tool will help the user expeditiously arrive at an optimized design to meet the application (...)
參考設計
TIDA-020033 — 車用 H 類音訊與追蹤電源供應器參考設計
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。
Design guide: PDF
| 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
內含資訊：
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
內含資訊：
- 晶圓廠位置
- 組裝地點