LMR51420XDDCR

The LMR51420 is a wide-V_IN, easy-to-use SIMPLE SWITCHER power converter synchronous buck converter capable of driving up to 2-A load current. With a wide input range of 4.5 V to 36 V, the device is suitable for a wide range of industrial applications for power conditioning from an unregulated source. The LMR51420 operates at 500-kHz and 1.1-MHz switching frequency to support use of relatively small inductors for an optimized solution size. The device has a PFM version to realize high efficiency at light load and 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 allows the device to be used with minimum 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. The LMR51420 is available in a 6-pin SOT-23 package.

Applications

• Appliances
• Building automation
• Motor drives
• General purpose wide V_IN power supplies

Key features

• Functional Safety-Capable Documentation available to aid functional safety system design
• Configured for rugged industrial applications
• 4.5-V to 36-V input voltage range
• 2-A continuous output current
• 70-ns minimum switching on time
• 500-kHz and 1.1-MHz fixed switching frequency options
• -40°C to 150°C junction temperature range
• 98% maximum duty cycle
• Start-up with prebiased output
• Internal short circuit protection with hiccup mode
• ±1.5% tolerance voltage reference
• Precision enable
• Small solution size and ease of use
• Integrated synchronous rectification
• Internal compensation for ease of use
• SOT-23 package
• Pin-to-pin compatible with the TPS54202 and TPS54302
• PFM and forced PWM (FPWM) options available
• Create a custom design using the LMR51420 with the WEBENCH Power Designer