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Features and Benefits

  • Wide Input Voltage Range: 3.6 V to 30 V
  • Adjustable and Fixed (3.3 V, 5 V) Output Options
  • Integrated 1 A Power Switch
  • Uses Small Surface-Mount Components
  • Cycle-By-Cycle Current Limiting
  • Peak Input Voltage (100 ms): 60 V
  • Configurable as a buck, buck-boost, and SEPIC regulator
  • Available in 8-lead SOIC package
  • Supported by ADIsimPower™ design tool

Product Details

The ADP3050 is a current mode monolithic buck (step down) PWM switching regulator that contains a high current 1 A power switch and all control, logic, and protection functions. It uses a unique compensation scheme allowing the use of any type of output capacitor (tantalum, ceramic, electrolytic, OS-CON). Unlike some buck regulators, the design is not restricted to using a specific type of output capacitor or ESR value.

A special boosted drive stage is used to saturate the NPN power switch, providing a system efficiency higher than conventional bipolar buck switchers. Further efficiency improvements are obtained by using the low voltage regulated output to provide the internal operating current of the device. A high switching frequency allows the use of small external surface-mount components. A wide variety of standard off-the-shelf devices can be used, providing a great deal of design flexibility. A complete regulator design requires only a few external components.

The ADP3050 includes a shutdown input that places the device in a low power mode, reducing the total supply current to under 20 µA. Internal protection features include thermal shutdown circuitry and a cycle-by-cycle current limit for the power switch to provide complete device protection under fault conditions.

The ADP3050 provides excellent line and load regulation, maintaining typically less than ±3% output voltage accuracy over temperature and under all input voltage and output current conditions.

The ADP3050 is specified over the industrial temperature range of −40°C to +85°C and is available in a thermally enhanced 8-lead (not Pb-free only) SOIC package and a standard 8-lead (Pb-free only) RoHS-compliant SOIC package.


  • Industrial power systems
  • PC peripheral power systems
  • Preregulator for linear regulators
  • Distributed power systems
  • Automotive systems
  • Battery chargers

Product Lifecycle icon-not-recommended Not Recommended for New Designs

This designates products ADI does not recommend broadly for new designs.

Evaluation Kits (1)

Tools & Simulations

Design Tools

ADP3050 Buck Regulator Design Tool

Microsoft Excel download tool from ADIsimPower to generate a power supply design complete with a schematic, bill of materials, and performance specifications.

Design Resources

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