MP28490 4.5-30V, 5A, 420kHz Step-Down Converter SOIC

MP28490 4.5-30V, 5A, 420kHz Step-Down Converter SOIC

The MP28490 is a monolithic step-down switch mode converter with a built in internal power MOSFET.

Key Specifications

Features

• Wide 4.5V to 30V Operating Input Range
• 5A Output Current
• 50mΩ Internal Power MOSFET Switch
• Power Good Indicator
• Fixed 420kHz Frequency
• Synchronizable up to 1.5MHz
• Cycle-by-Cycle Over Current Protection with hiccup
• Thermal Shutdown
• Output Adjustable from 0.8V to 15V
• Stable with Low ESR Output Ceramic Capacitors

Typical Application Circuit

Applications

• 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