LM5145-Q1
- AEC-Q100 qualified
for automotive applications:
- Device temperature grade 1: –40°C to +125°C ambient temperature range
- Functional Safety-Capable
- Versatile synchronous buck DC/DC controller
- Wide input voltage range of 5.5 V to 75 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 25 Class 5 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
- 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 LM5145-Q1 with WEBENCH Power Designer
The LM5145-Q1 75-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 LM5145-Q1 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-power automotive DC/DC regulators, automotive motor drives, and HEV/EV power compliant to LV-148.
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.
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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 | LM5145-Q1 Automotive 75-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range datasheet (Rev. A) | PDF | HTML | 2021/6/8 | ||
| 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 | LM5145-Q1 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 | ||||
| 應用說明 | Creating a Dual USB Universal Car Charger From the TPS40170 and Two TPS2511 | 2012/5/22 |
設計與開發
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Welcome to the LM5145 Quickstart Design Tool. This standalone tool facilitates and assists the power supply engineer with the design of a DC/DC buck regulator based on the LM5145 75V synchronous buck controller. As such, the user can expeditiously arrive at an optimized design to meet the (...)
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| VQFN (RGY) | 20 | Ultra Librarian |
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