Industrial Grade, 36V, 1A, Low Quiescent Current, Synchronous, Step-Down Converter AEC-Q100 Qualified

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Product Description

The MPQ4431 is a frequency-programmable (350kHz to 2.5MHz), synchronous, step-down switching regulator with integrated, internal, high-side and low-side power MOSFETs. It provides up to 1A of highly efficient output current with current mode control for fast loop response. 
The wide 3.3V to 36V input range accommodates a variety of step-down applications in automotive input environments and is ideal for battery-powered applications due to its extremely low quiescent current.
The MPQ4431 employs advanced asynchronous mode (AAM), which helps achieve high efficiency in light-load condition by scaling down the switching frequency to reduce switching and gate driving losses.
Standard features include soft start (SS), external clock synchronization, enable (EN) control, and a power good (PG) indicator. High-duty cycle and low dropout mode are provided for automotive cold-crank condition.
Over-current protection (OCP) with valley-current detection is employed to prevent the inductor current from running away. Hiccup mode reduces the average current in short-circuit condition greatly. Thermal shutdown provides reliable and fault-tolerant operation.
The MPQ4431 is available in a QFN-16 (3mmx4mm) package.


Product Features

  • Wide 3.3V to 36V Operating Input Range
  • 1A Continuous Output Current
  • 1μA Low Shutdown Mode Current
  • 10μA Sleep Mode Quiescent Current
  • Internal 90mΩ High-Side and 80mΩ Low-Side MOSFETs
  • 350kHz to 2.5MHz Programmable Switching Frequency
  • Fixed Output Options: 3.3V, 3.8V, 5V
  • Synchronize to External Clock
  • Selectable In-Phase or 180° Out-of-Phase
  • Power Good (PG) Indicator
  • Programmable Soft-Start (SS) Time
  • 80ns Minimum On Time
  • Selectable Forced CCM or AAM
  • Low Dropout Mode
  • Over-Current Protection (OCP) with Valley-Current Detection and Hiccup
  • Available in a QFN-16 (3mmx4mm) Package
  • Available with Wettable Flank
  • AEC-Q100 Grade-1


  • fsw (max) (kHz)2500
  • Vin (min) (V)3.3
  • Vin (max) (V)36
  • Iout (max) (A)1
  • Vfb (V)0.8
  • Iq (typ) (mA)0.01
  • GradeIndustrial
  • PackageQFN-16 (3x4)
  • Control ModeCurrent Mode
  • Common FeaturesExternal Soft Start, Power Good, Synchronous Rectification
  • Special FeaturesProgrammable Frequency

Reference Materials

Quality Policy, Certificates & Reliability Reports
All MPS parts are lead-free, halogen-free and adhere to the RoHS directive. See Environmental section for details.