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Monolithic Power Systems (MPS) MPQ4583-AEC1 Synchronous Step-Down DC/DC Converter

Monolithic Power Systems (MPS) MPQ4583-AEC1 Synchronous Step-Down DC/DC Converters are low-quiescent-current power solutions designed for automotive and industrial applications. The converters operate from a 4.5V to 90V input range and deliver up to 3.5A of output current. Integrated high-side and low-side MOSFETs, internal compensation, and a fixed 400kHz switching frequency simplify system design and improve efficiency.

The MPS MPQ4583-AEC1 features a typical quiescent current of only 9μA and supports both Power-Save Mode (PSM) and Forced Continuous Conduction Mode (FCCM) operation. The devices provide accurate output regulation with output voltages ranging from 0.8V to 35V. Comprehensive protection features include over-current, short-circuit, over-voltage, and over-temperature protection, while AEC-Q100 Grade 1 qualification ensures reliability in demanding automotive environments.

Features

  • 4.5V to 90V input voltage (VIN) range
  • 9μA quiescent current
  • Fixed 400kHz switching frequency with frequency dithering
  • Selectable PSM or FCCM
  • 0.8V to 35V output voltage range
  • ±1% Feedback (FB) reference accuracy at +25°C
  • 170mΩ/80mΩ internal MOSFETs
  • Supports internal FB resistor divider for 5V/12V VOUT via factory trimming
  • Power Good (PG) indication
  • VOUT discharge function during output Over-Voltage Protection (OVP) and Enable (EN) shutdown
  • VCC power from BIAS if the BIAS voltage ≥ 4.25V for high efficiency
  • Internal loop compensation and Soft Start (SS)
  • Output Over-Current Protection (OCP), OVP, and thermal shutdown
  • Available in a QFN-19 (3mm x 5mm) package with wettable flanks
  • AEC-Q100 Grade 1 qualified

Applications

  • Automotive 48V systems
  • Automotive DC/DC converters
  • Automotive HVAC compressors and PTC heaters
  • Automotive braking systems
  • Industrial power supplies

Specifications

  • 4.5V to 90V operating supply voltage range
  • 0.8V to 35V operating output voltage range
  • 3.5A operating output current
  • 3.9W maximum continuous power dissipation
  • Power supply
    • 3.75V to 4.15V VIN undervoltage lockout (UVLO) rising threshold range
    • 350mV typical VIN/VCC UVLO threshold hysteresis
    • 3.7V to 4.1V VCC UVLO rising threshold range
    • 4.5V to 5.25V VCC regulation voltage range
    • 4.2V to 4.4V maximum BIAS power supply threshold range
  • Supply current
    • 5µA maximum shutdown, 1µA typical
    • 13µA maximum quiescent
  • Switching frequency
    • 400kHz typical switching frequency (±10%)
    • ±6% typical frequency dithering span
    • 120ns (typical) minimum off time
    • 40ns (typical) minimum on time
  • Power MOSFET
    • 80mΩ typical low-side MOSFET (LS-FET) on-resistance
    • 170mΩ typical high-side MOSFET (HS-FET) on-resistance
  • Thermal protection
    • 160°C typical shutdown rising threshold
    • 20°C typical shutdown hysteresis
  • ESD ratings
    • ±2000V Human Body Model (HBM)
    • ±750V Charged-Device Model (CDM)
  • -40°C to +150°C operating junction temperature range
  • +150°C maximum junction temperature
  • +260°C maximum lead temperature

Typical Application

Application Circuit Diagram - Monolithic Power Systems (MPS) MPQ4583-AEC1 Synchronous Step-Down DC/DC Converter

Functional Block Diagram

Block Diagram - Monolithic Power Systems (MPS) MPQ4583-AEC1 Synchronous Step-Down DC/DC Converter
Published: 2026-10-26 | Updated: 2026-10-26