LM5146
- Functional Safety-Capable
- Versatile synchronous buck DC/DC controller
- Wide input voltage range of 5.5 V to 100 V
- 150°C maximum junction temperature
- 0.8-V reference with ±1% feedback accuracy
- Adjustable output voltage from 0.8 V to 60 V
- 40-ns tON(min) for high VIN / VOUT ratio
- 140-ns tOFF(min) for low dropout
- Lossless RDS(on) or shunt current sensing
- Optimized for CISPR 11 and CISPR 32 Class B EMI requirements
- Switching frequency from 100 kHz to 1 MHz
- SYNC in and SYNC out capability
- Selectable diode emulation or FPWM
- 7.5-V gate drivers for standard VTH
MOSFETs
- 14-ns adaptive dead-time control
- 2.3-A source and 3.5-A sink capability
- Fast line and load transient response
- Voltage-mode control with line feedforward
- High gain-bandwidth error amplifier
- Inherent protection features for robust design
- Adjustable output voltage soft start
- Hiccup-mode overcurrent protection
- Input UVLO with hysteresis
- VCC and gate-drive UVLO protection
- Precision enable input and open-drain PGOOD indicator for sequencing and control
- Thermal shutdown protection with hysteresis
- 20-pin VQFN package with wettable flanks
- Create a custom design using the LM5146 with WEBENCH Power Designer
The LM5146 100-V synchronous buck controller regulates from a high input voltage source or from an input rail subject to high-voltage transients, minimizing the need for external surge suppression components. A high-side switch minimum on-time of 40 ns gives large step-down ratios, enabling the direct step-down conversion from a 48-V nominal input to low-voltage rails for reduced system complexity and solution cost. The LM5146 continues to operate during input voltage dips as low as 5.5 V, at nearly 100% duty cycle if needed, making it an excellent choice for high-performance industrial controls, robotics, datacom, and RF applications.
Forced-PWM (FPWM) operation eliminates switching frequency variation to minimize EMI, while user-selectable diode emulation lowers current consumption at light-load conditions. The adjustable switching frequency as high as 1 MHz can be synchronized to an external clock source to eliminate beat frequencies in noise-sensitive applications.
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 | LM5146 100-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range datasheet (Rev. A) | PDF | HTML | 2021/6/23 | ||
| 應用說明 | Power Supply Designs for eBike That Meet the New GB42295 National Standard | 2025/7/10 | ||||
| 應用說明 | Controller to Converter – Design Considerations for 24V and 48V Systems | PDF | HTML | 2024/10/2 | |||
| 功能安全資訊 | LM5146 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA | PDF | HTML | 2021/6/23 | |||
| 電子書 | An Engineer’s Guide to Low EMI in DC/DC Regulators | 2021/4/21 | ||||
| 白皮書 | An overview of radiated EMI specifications for power supplies | 2018/6/5 | ||||
| 白皮書 | An overview of conducted EMI specifications for power supplies | 2018/2/1 | ||||
| Application brief | Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout | 2017/11/13 |
設計與開發
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LM5145EVM-HD-20A — LM5145 寬輸入電壓同步降壓控制器高密度評估模組
LM5146-Q1-EVM12V — 同步降壓控制器評估模組
LM5146-Q1-EVM12V 高密度評估模組 (EVM) 可展示具有寬輸入電壓範圍的 LM5146-Q1 高性能同步降壓 DC-DC 降壓控制器的效能。該設計採用微型元件封裝，元件數量少。此評估模組可在 15V 至 85V 的廣泛輸入電壓範圍內運作，提供固定 12V 輸出，設定點準確度優於 1%，且最大輸出電流可達 8A。憑藉 LM5146-Q1 的 40ns 最小開啟時間，就能以極低工作週期進行運作。LM5146-Q1 提供全套防護功能，可確保穩壓器在發生故障時提供防護。其中包括欠電壓鎖定以在電壓暫降情況下確保正常運作、可編程緩啟動以減少突波電流、Hiccup (...)
LM5146DESIGN-CALC — LM5146/-Q1 100V synchronous buck controller quickstart calculator
歡迎使用 LM5146/-Q1 快速入門設計工具。此獨立工具會加速協助電源供應工程師設計採用基於 LM5146/-Q1 100V 同步降壓控制器的 DC/DC 降壓穩壓器進行設計。因此，使用者可以迅速達到最佳化的設計，以符合應用需求。
TIDA-010089 — 雙象限、15V、8A、可編程線性直流電源供應器參考設計
此參考設計展現低雜訊有效率的雙向電源供應器，可實現低於 ±0.02% 全刻度 (FS) 電流與電壓控制準確度。此設計利用類比回饋迴路進行精確電流控制，並實作電壓追蹤電路，將來源模式線性級的功率消耗降到最低。此實作方式可實現 120W 輸出功率，並可在外部冷卻下汲取高達 25W。
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VQFN (RGY) | 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。