LM5146QRGYTQ1

Description

The LM5146QRGYTQ1 100-V synchronous buck controller regulates either a high input voltage source or a high voltage transient-prone input rail, reducing the need for external surge suppression components.

Large step-down ratios are enabled by a high-side switch minimum on-time of 40 ns, allowing direct step-down conversion from a 48-V nominal input to low-voltage rails for decreased system complexity and solution cost.

The LM5146QRGYTQ1 operates at approximately 100 percent duty cycle with input voltage dips as low as 5.5 V, making it a great choice for high-performance 48-V battery automotive applications, ADAS (surround view ECU), and HEV/EV systems.

Features

? 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 LM5146-Q1 with WEBENCH? Power Designer

? AEC-Q100 qualified for automotive applications:

– Device temperature grade 1: –40°C to +125°C ambient temperature range

? Functional Safety-Capable

– Documentation available to aid functional safety system design

? 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 25 Class 5 requirements

? Switching frequency from 100 kHz to 1 MHz

– SYNC In and SYNC Out capability

– Selectable diode emulation or FPWM

Applications

? HEV/EV powertrain systems

? Body electronics and lighting

? Infotainment and cluster

? High-power automotive DC/DC regulator

? Automotive motor drives, ADAS