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Monolithic Power Systems (MPS) MP4323 Synchronous Step-Down Converters

Monolithic Power Systems (MPS) MP4323 Synchronous Step-Down Converters are frequency-configurable (350kHz to 2.5MHz), synchronous, step-down switching converters with integrated internal high-side and low-side power MOSFETs (HS-FET and LS-FET, respectively). The MP4323 delivers up to 3A of highly efficient output current (IOUT) with peak current control mode. The MP4323 offers a 3.3V to 36V wide input voltage (VIN) range and 42V load dump tolerance to adapt to various step-down applications in automotive input environments. The 1μA shutdown current (ISD) enables the device to be used in battery-powered applications.

The MPS MP4323 Synchronous Step-Down Converters provide high power conversion efficiency across a wide load range that is achieved by scaling down the switching frequency (fSW) under light-load conditions to reduce the switching and gate driver losses. An open-drain power good (PG) signal indicates whether the output voltage (VOUT) is between 94.5% and 105.5% of its nominal voltage.

Frequency foldback prevents inductor current (IL) runaway during start-up. Thermal shutdown supplies reliable, fault-tolerant operation.

A high-duty cycle and low-dropout mode are implemented for automotive cold-crank conditions.

The MP4323 is housed in a QFN-12 (2mm x 3mm) package.

Features

  • Designed for automotive applications:
    • 42V Load dump tolerance
    • Supports 3.1V cold crank
    • 3A Continuous Output Current (IOUT)
    • Wide 3V to 36V Operating Input Voltage (VIN) range
    • -40°C to +125°C Junction Temperature (TJ) range
  • Increases Battery Life:
    • 1μA Shutdown current (ISD)
    • 20μA Sleep mode current
    • Advanced Asynchronous Modulation (AAM) mode for increased efficiency under light-load conditions
  • High performance for improved thermals:
    • Integrated 70mΩ HS-FET and 50mΩ LS-FET
    • 65ns Minimum On Time (tON_MIN) and 50ns Minimum Off Time (tOFF_MIN)
  • Optimized for EMC/EMI reduction:
    • Frequency Spread Spectrum (FSS) modulation
    • Symmetric VIN Pins (Pin 2 and Pin 10)
    • CISPR25 Class 5 compliant
    • 350kHz to 2.5MHz Configurable Switching Frequency (fSW)
    • MeshConnect™ Flip-Chip package
  • Additional features:
    • Power Good (PG) output
    • Low-Dropout (LDO) mode
    • Over-Current Protection (OCP) with hiccup mode
    • Available in a QFN-12 (2mm x 3mm) package
    • Available in a wettable flank package

Applications

  • USB Chargers
  • Automotive applications
  • Battery-powered systems
  • General consumer applications

Typical Applications

Application Circuit Diagram - Monolithic Power Systems (MPS) MP4323 Synchronous Step-Down Converters

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Paskelbta: 2022-08-10 | Atnaujinta: 2024-02-18