MPQ8643 2.7-16V, 20A, 600kHz Synchronous Step-Down Converter QFN-21

MPQ8643 2.7-16V, 20A, 600kHz Synchronous Step-Down Converter QFN-21

Key Specifications

Features

• Wide Input Voltage (VIN) Range: o 2.7V to 16V with External 3.3V Bias o 4V to 16V with Internal Bias or External 3.3V Bias
• Differential Output Remote Sense
• Configurable Accurate Current Limit (ILIMIT)
• 20A Output Current (IOUT)
• Integrated Low RDS(ON) Power MOSFETs
• Proprietary Switching Loss Reduction Technique
• Adaptive Constant-On-Time (COT) Control for Ultra-Fast Transient Response
• Stable with Zero-ESR Output Capacitor
• Reference Voltage (VREF) Accuracy: o 0.5% VREF Accuracy from 0°C to 70°C o 1% VREF Accuracy from -40°C to +125°C
• Selectable Pulse-Skip Mode (PSM) or Forced Continuous Conduction Mode (FCCM)

Applications

• Telecom and Networking Systems
• Servers, Cloud Computing, and Storage
• Base Stations
• General-Purpose Point-of-Load (PoL)
• 12V Distribution Power Systems
• High-End Televisions

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-21 — check the land pattern in the datasheet before layout.

Common Questions