MP8772CGQ-Z 3-17V, 12A, 700kHz Synchronous Step-Down Converter QFN-16

MP8772CGQ-Z 3-17V, 12A, 700kHz Synchronous Step-Down Converter QFN-16

The MP8772C is a fully integrated, high- frequency, synchronous, rectified, step-down switch-mode converter with internal power MOSFETs.

Key Specifications

Features

• Forced Continuous Conduction Mode (FCCM)
• Fixed 700kHz Switching Frequency (fSW)
• Adjustable Output Voltage (VOUT) from 0.6V
• Wide 3V to 17V Operating Input Voltage (VIN) Range
• 12A Output Current (IOUT)
• 16mΩ/5.5mΩ Low On Resistance (RDS(ON)) Internal Power MOSFETs
• 100μA Quiescent Current (IQ)
• High-Efficiency Synchronous Mode
• Pre-Biased Start-Up
• Externally Configurable Soft-Start Time (tSS)

Typical Application Circuit

Applications

• Security Cameras
• Portable Devices and xDSL Devices
• Digital Set-Top Boxes (STBs)
• 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