MP38874 4.5-21V, 8A, 600KHz Step-Down Converter QFN14

MP38874 4.5-21V, 8A, 600KHz Step-Down Converter QFN14

The MP38874 is a monolithic step-down switch mode converter with a built in internal power MOSFET.

Key Specifications

Features

• Wide 4.5V to 21V Operating Input Range
• 8A Continuous Output Current
• 42mΩ Internal Power MOSFET Switch
• Power Good Indicator
• Synchronous Gate Driver Delivers up to 95% Efficiency
• Fixed 600KHz Frequency
• Synchronizable to >1MHz External Clock
• Cycle-by-Cycle Over Current Protection
• Thermal Shutdown
• Output Adjustable from 0.8V to 15V

Typical Application Circuit

Applications

• Point of Load Regulator in Distributed Power System
• Digital Set Top Boxes
• Personal Video Recorders
• Broadband Communications
• Flat Panel Television and Monitors "MPS" and "The Future of Analog IC Technology" are Registered Trademarks of Monolithic Power Systems, Inc.

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