MP8773 3A, 500kHz Synchronous Step-down Converter SOIC

MP8773 3A, 500kHz Synchronous Step-down Converter SOIC

The MP8773 is a monolithic high frequency synchronous rectified step-down switch mode converter with built in internal power MOSFETs.

Key Specifications

Features

• Wide 4.5 to 23V Operating Input Range
• 3A Output Current
• 19mΩ LS FET
• Proprietary Switching Loss Reduction Technique
• Fixed 500kHz Switching Frequency
• Internal Compensation
• OCP Protection and Thermal Shutdown
• Output Adjustable from 0.8V
• Available in 14-pin QFN3x4 and SOIC8E packages

Typical Application Circuit

Applications

• Notebook Systems and I/O Power
• Networking Systems
• Digital Set Top Boxes
• Personal Video Recorders
• Flat Panel Television and Monitors

Design Notes

• Size the inductor for the ripple current at the actual switching frequency, typically 30% of the DC load — not for the DC rating alone.
• The hot loop from input capacitor through the switch to ground sets conducted EMI. Keep that copper area as small as the layout allows.
• Output ripple is set by the capacitor ESR and its DC-bias derating; a 10 µF ceramic often behaves like 4 µF at the rated output voltage.
• Route the feedback divider from the output capacitor terminals, away from the switch node.

Common Questions