55V, 1.5A, 2MHz(Adj.) Industrial-Grade Buck Converter With AEC-Q100 Qualified

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Product Description

The MPQ4559 is a high frequency step-down switching regulator with integrated internal high-side high voltage power MOSFET. It provides 1.5A output with current mode control for fast loop response and easy compensation. The wide 3.8V to 55V input range accommodates a variety of step-down applications, including those in automotive input environment. A 12µA shutdown mode supply current allows use in battery-powered applications. High power conversion efficiency over a wide load range is achieved by scaling down the switching frequency at light load condition to reduce the switching and gate driving losses. The frequency foldback helps prevent inductor current runaway during startup and thermal shutdown provides reliable, fault tolerant operation. By switching at 2MHz, the MPQ4559 is able to prevent EMI (Electromagnetic Interference) noise problems, such as those found in AM radio and ADSL applications. The MPQ4559 is available in small 3mm x 3mm QFN10 and  SOIC8 with exposed pad packages.


Product Features

  • Guaranteed Industrial Temp Range Limits
  • Wide 3.8V to 55V Operating Input Range
  • 250mΩ Internal Power MOSFET
  • Up to 2MHz Programmable Switching Frequency
  • 140μA Quiescent Current
  • Ceramic Capacitor Stable
  • Internal Soft-Start
  • Up to 95% Efficiency
  • Output Adjustable from 0.8V to 52V
  • Available in QFN (3mm x 3mm) and SOIC8E with Exposed Pad Packages
  • AEC-Q100 Qualified


  • fsw (max) (kHz)2000
  • Vin (min) (V)3.8
  • Vin (max) (V)55
  • Iout (max) (A)1.5
  • Isw Limit (typ) (A)2.3
  • Vfb (typ) (V)0.8
  • Iq (typ) (mA)0.14
  • Regulated Outputs1
  • Vout (max) (V)52
  • Vout (min) (V)0.8
  • GradeIndustrial
  • PackageQFN-10 (3x3), SOIC-8E
  • Control ModeCurrent Mode
  • Common FeaturesLight-Load Efficiency
  • Special FeaturesProgrammable Frequency

Evaluation Kit


Kit details

The EVQ4559DN-00A is an evaluation board for the MPQ4559, a high frequency step-down regulator with an integrated power MOSFET.

The MPQ4559 integrates a 250mΩ  MOSFET that provides 1.5A load current over a wide operating input voltage of 4.5V to 55V.

Current mode control provides fast transient response and eases loop stabilization. An internal soft-start prevents inrush current at turn-on.

The EVQ4559DN-00A is a fully assembled and tested PCB. It generates a +3.3V output voltage at load current up to 1.5A from an 8V to 55V input range. Switching frequency is set at 500kHz.

US$ 50.00 + tax