LMR54406FDBVR

The LMR544xx is a simple, easy-to-use wide VIN synchronous buck converter capable of driving load currents up to 1A and 0.6A. The device features a wide input voltage range of 4V to 36V, making it suitable for a variety of industrial applications requiring power regulation from unregulated sources. The LMR544xx operates at a switching frequency of 1.1MHz, supporting the use of relatively small inductors for an optimized solution size. It is available in a PFM version for high efficiency at light loads and an FPWM version for constant-frequency operation with low output voltage ripple across the full load range. Soft-start and compensation circuitry are implemented internally, minimizing the number of external components required. The device incorporates built-in protection features, including cycle-by-cycle current limiting, discontinuous mode short-circuit protection, and thermal shutdown under excessive power dissipation conditions.

Applications

• Large Appliances
• PLC, DCS, and PAC
• Smart Meters
• Universal Wide Input Voltage Power Supplies

Key features

• Documentation supporting functional safety system design
• Functional safety compliant
• Designed for harsh industrial applications
• 4V to 36V input voltage range with up to 50V VIN transient voltage tolerance
• 0.6A/1A continuous output current
• Minimum on-time: 60ns
• 1.1MHz fixed switching frequency
• -40°C to 150°C junction temperature range
• 98% maximum duty cycle
• Monotonic startup with pre-biased output
• Short-circuit protection with hiccup mode
• Precision enable pin
• ±1% tolerance voltage reference
• Compact, easy-to-use solution
• Integrated synchronous rectification
• Built-in compensation for ease of use
• SOT-23 package