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Monolithic Power Systems (MPS) MPQ4321 Synchronous Step-Down Converters

Monolithic Power Systems (MPS) MPQ4321 Synchronous Step-Down Converters feature a 3.3V to 36V input range with 42V load dump tolerance and 1A continuous output current. These converters are frequency-configurable (350kHz to 2.5MHz) with integrated internal high-side and low-side power MOSFETs. The MPQ4321 step-down converters offer 1μA shutdown mode quiescent current that allows the device to be used in battery-powered applications. These step-down converters achieve high power conversion efficiency by scaling down the switching frequency (fSW) under light-load conditions to reduce the switching and gate-driving losses. The MPQ4321 step-down converters provide high-duty cycles and low-dropout modes for automotive cold-crank conditions. Typical applications include automotive infotainment, Advanced Driver Assistance Systems (ADAS), industrial power systems, and automotive clusters.

Features

  • Designed for automotive applications:
    • Survives 42V load dump
    • Supports 3.1V cold crank
    • Low-dropout mode
    • 1A of continuous output current
    • Up to 36V continuous operation
    • -40°C to 150°C operating junction temperature range
    • 65ns minimum on time and 50ns minimum off time
  • Increases battery life:
    • 1μA shutdown supply current
    • 20μA sleep mode quiescent current
    • Advanced Asynchronous Mode (AAM) increases efficiency under light loads
  • High performance for improved thermal performance:
    • Integrated 70mΩ high-side and 50mΩ low-side MOSFETs
  • Optimized for EMC/EMI:
    • Frequency spread spectrum modulation
    • Symmetric VIN pinout
    • CISPR25 class 5 compliant
    • 350kHz to 2.5MHz configurable switching frequency
    • MeshConnect™ flip-chip package
  • Additional features:
    • Power Good Output
    • Hiccup Over-Current Protection (OCP)
    • Available in a QFN-12 (2mm x 3mm) package
    • Available in a QFN-12 (3mm x 4mm) package with wettable flanks
    • Available in AEC-Q100 Grade-1

Applications

  • Automotive infotainment
  • Automotive clusters
  • Advanced Driver Assistance Systems (ADAS)
  • Industrial power systems

Block Diagram

Block Diagram - Monolithic Power Systems (MPS) MPQ4321 Synchronous Step-Down Converters

Application Circuit Diagram

Application Circuit Diagram - Monolithic Power Systems (MPS) MPQ4321 Synchronous Step-Down Converters

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Monolithic Power Systems (MPS) MPQ4321 Synchronous Step-Down Converters