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
