MP4473 3.5A, 200kHz Step-Down Converter QFN-20

MP4473 3.5A, 200kHz Step-Down Converter QFN-20

Key Specifications

Features

• Wide 4.5V-to-36V Operating Input Range
• Guaranteed 3.5A, Continuous Output Current
• Internal 40mΩ High-Side, 20mΩ Low-Side Power MOSFETs
• Proprietary Switching-Loss-Reduction Technology
• 1% Reference Voltage
• Programmable Soft-Start Time
• Low Drop-Out Mode
• 200kHz-to-1MHz Switching Frequency
• SCP, OCP, UVP, and Thermal Shutdown
• Output Adjustable from 0.8V to 0.9×VIN

Applications

• Notebook Systems and I/O Power
• Automotive Systems
• Networking Systems
• Industrial Supplies
• Optical Communications Systems

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-20 — check the land pattern in the datasheet before layout.

Common Questions