Features for the LMR54410

• Functional Safety-Capable
• Configured for rugged industrial applications
  • 4-V to 36-V input voltage range
  • Withstands up to 50-V short VIN transient
  • 0.6-A/1-A continuous output current
  • 60-ns minimum switching on time
  • 1.1-MHz fixed switching frequency
  • –40°C to 150°C junction temperature range
  • 98% maximum duty cycle
  • Monotonic start-up with pre-biased output
  • Short circuit protection with hiccup mode
  • Precision enable
  • ±1% tolerance voltage reference
• Small solution size and ease of use
  • Integrated synchronous rectification
  • Internal compensation for ease of use
  • SOT-23 package
• Various options in pin-to-pin compatible package
  • PFM and forced PWM (FPWM) options

Description for the LMR54410

The LMR544xx is a wide-VIN, easy-to-use synchronous buck converter capable of driving up to 1-A and 0.6-A load current. With a wide input range of 4 V to 36 V, the device is suitable for a wide range of industrial applications for power conditioning from an unregulated source.

The LMR544xx operates at 1.1-MHz switching frequency to support use of relatively small inductors for an optimized solution size. It has a PFM version to realize high efficiency at light load and a FPWM version to achieve constant frequency and small output voltage ripple over the full load range. Soft-start and compensation circuits are implemented internally, which allow the device to be used with minimal external components.

The device has built-in protection features, such as cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation.