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The LM5145QRGYRQ1 75V Synchronous Buck Controller is designed to minimise the need for external surge suppression components by regulating high input voltage sources or input supply rails that are subject to high voltage transients. the ultra-short on-time of the high-side switch of 40ns facilitates a large step-down ratio and supports direct step-down conversions from the 48V nominal input to the low voltage rail, reducing system complexity and solution cost. This reduces system complexity and solution cost. The LM5145-Q1 can continue to operate at nearly 100% duty cycle as needed even when the input voltage dips as low as 5.5V, making it ideally suited for LV-148-compliant high-power automotive DC/DC regulators, automotive motor drives, and HEV/EV power supplies.

Features

Compliant with AEC-Q100 for automotive applications:

Device temperature class 1: -40°C to +125°C ambient temperature range

Functionally safe available

Documentation to aid in functional safety system design

Multifunction Synchronous Step-Down DC/DC Controller

Wide input voltage range of 5.5V to 75V

150°C maximum junction temperature

0.8V reference with ±1% feedback accuracy

Adjustable output voltage range of 0.8V to 60V

40ns tON(min) for high VIN/VOUT ratio

140ns tOFF(min) for low dropouts

Lossless RDS(on) or shunt current sensing

Optimised for CISPR 25 level 5 requirements

Switching frequency range of 100kHz to 1MHz

Synchronous input and synchronous output functions

Optional diode emulation or FPWM

7.5V gate driver for standard VTH MOSFETs

14ns adaptive dead-time control

2.3A pull current and 3.5A sink current capability

Inherent protection features for robust designs

Adjustable output voltage for soft start

Intermittent mode overcurrent protection

Input UVLO with hysteresis

VCC and gate drive UVLO protection

Precision enable inputs and open drain PGOOD indicators (for timing and control)

Thermal shutdown protection with hysteresis

20-pin VQFN package with wettable sides

Use the LM5145-Q1 and create a custom design with WEBENCH Power Designer

Applications

High-power automotive DC/DC regulators

Automotive motor drives, ADAS

HEV/EV powertrain systems

Body electronics and lighting

Infotainment systems and instrument clusters

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