MP9447 5A, 200kHz Step-Down Converter QFN-25

MP9447 5A, 200kHz Step-Down Converter QFN-25

Key Specifications

Features

• Wide 4.5V-to-36V Operating Input Range
• Guaranteed 5A, Continuous Output Current
• Internal 65mΩ High-Side, 30mΩ Low-Side Power MOSFETs
• Proprietary Switching-Loss-Reduction Technology
• 1.5% Reference Voltage
• Programmable Soft-Start Time
• Low Drop-out Mode
• 200kHz-to-650kHz Switching Frequency
• SCP, OCP, UVP, and Thermal Shutdown
• Output Adjustable from 0.8V to 0.9×VIN

Applications

• General Consumer
• USB Power Supplies
• Cigarette Lighter Adapters

Design Notes

• The step-down topology needs an inductor and output capacitor sized for the ripple at the switching frequency, not just the DC load.
• Keep the input loop short — high di/dt at the switch node sets conducted EMI.
• Power switches are integrated, so the thermal path is the PCB copper under the pad.
• Package QFN-25 — check the land pattern in the datasheet before layout.

Common Questions