MPQ4583-AEC1 4.5-90V, 3.5A, 400kHz Step-Down Converter QFN-19

MPQ4583-AEC1 4.5-90V, 3.5A, 400kHz Step-Down Converter QFN-19

Key Specifications

Features

• 4.5V to 90V Input Voltage (VIN) Range
• 9μA Quiescent Current (IQ)
• Fixed 400kHz Switching Frequency (fSW) with Frequency Dithering
• Selectable Power-Save Mode (PSM) or Forced Continuous Conduction (FCCM) Mode
• 0.8V to 35V Output Voltage (VOUT) Range
• ±1% FB Reference Accuracy at Junction Temperature (TJ) = 25°C
• Supports Internal FB Resistor Divider for 5V/12V VOUT via Factory Trimming
• VOUT Discharge Function during Output Over-Voltage Protection (OVP) and EN Shutdown
• 170mΩ/80mΩ Internal MOSFETs
• Power Good (PG) Indication

Applications

• Automotive 48V Systems
• Automotive DC/DC Converters
• Automotive HVAC Compressors and PTC Heaters
• Automotive Braking Systems

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.
• AEC-Q100 qualification suits this part to automotive rails.
• Package QFN-19 — check the land pattern in the datasheet before layout.

Common Questions