DESCRIPTION

· The LM5146-Q1 is a 100-V synchronous buck controller designed for high input voltage sources or rails with high voltage transients, reducing the need for external surge suppression components.
· It features a high-side switch minimum on-time of 40 ns, enabling large step-down ratios and direct conversion from 48-V nominal input to low-voltage rails.
· It operates during input voltage dips as low as 5.5 V, making it suitable for high-performance 48-V battery automotive applications, ADAS, and HEV/EV systems.
· It supports Forced-PWM (FPWM) operation to minimize EMI and user-selectable diode emulation for lower current consumption at light-load conditions.
· The adjustable switching frequency up to 1 MHz can be synchronized to an external clock source for noise-sensitive applications.

FEATURES

· AEC-Q100 qualified for automotive applications with an ambient temperature range of -40°C to +125°C.
· Functional Safety-Capable with documentation available for functional safety system design.
· Wide input voltage range of 5.5 V to 100 V and adjustable output voltage from 0.8 V to 60 V.
· 40-ns tON(min) for high VIN/VOUT ratio and 140-ns tOFF(min) for low dropout.
· Lossless RDS(on) or shunt current sensing and optimized for CISPR 25 Class 5 requirements.
· Switching frequency from 100 kHz to 1 MHz with SYNC In and SYNC Out capability.
· 7.5-V gate drivers for standard VTH MOSFETs with 14-ns adaptive dead-time control and 2.3-A source and 3.5-A sink capability.
· Inherent protection features including adjustable output voltage soft start, hiccup-mode overcurrent protection, input UVLO with hysteresis, VCC and gate-drive UVLO protection, precision enable input, open-drain PGOOD indicator, and thermal shutdown protection with hysteresis.
· 20-pin VQFN package with wettable flanks.

APPLICATIONS

· High-power automotive DC/DC regulator.
· Automotive motor drives and ADAS.
· HEV/EV powertrain systems.
· Body electronics and lighting.
· Infotainment and cluster.