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
| 類型 | 標題 | 日期 | ||
|---|---|---|---|---|
| * | Data sheet | LM5146 100-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range datasheet (Rev. A) | PDF | HTML | 2021年 6月 23日 |
| Application note | Controller to Converter – Design Considerations for 24V and 48V Systems | PDF | HTML | 2024年 10月 2日 | |
| Functional safety information | LM5146 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA | PDF | HTML | 2021年 6月 23日 | |
| E-book | An Engineer’s Guide to Low EMI in DC/DC Regulators | 2021年 4月 21日 | ||
| EVM User's guide | LM5146-Q1EVM User's Guide | 2018年 8月 10日 | ||
| White paper | An overview of radiated EMI specifications for power supplies | 2018年 6月 5日 | ||
| White paper | An overview of conducted EMI specifications for power supplies | 2018年 2月 1日 | ||
| Application brief | Improve DC/DC Regulator EMI for Free with Optimized Power Stage Layout | 2017年 11月 13日 | ||
| EVM User's guide | LM5145EVM-HD-20A High Density Evaluation Module (Rev. A) | 2017年 6月 7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)。
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
The LM5146-Q1-EVM12V high density evaluation module (EVM) is designed to showcase the performance of the LM5146-Q1 high performance, synchronous buck DC-DC buck controller with wide input voltage range. The design is packaged in a miniature footprint with low component count. It operates over a (...)
LM5146DESIGN-CALC — LM5146-Q1 同步降壓控制器快速入門設計工具
| 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
- 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
- 晶圓廠位置
- 組裝地點