Packaging information
Package | Pins VQFN (RGY) | 20 |
Operating temperature range (°C) -40 to 150 |
Package qty | Carrier 3,000 | LARGE T&R |
Features for the 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
Description for the LM5145-Q1
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.