Features and Benefits

  • Wide Range of Operation
    • Wide 4.5V to 60V Input Voltage Range
    • Wide 0.8V to 24V Output Voltage Range
    • RSENSE or Inductor DCR Current-Sensing
    • 100kHz to 2.2MHz Adjustable Frequency with External Clock Synchronization
    • Available in a Lead (Pb)-Free 20-Pin, 4mm x 4mm TQFN-EP Package
  • Enhances Power Efficiency
    • Low-Impedance Gate Drives for High Efficiency
    • DCM Operation at Light Loads
    • Auxiliary Bootstrap LDO
  • Operates Reliably in Adverse Industrial Environments
    • Programmable Soft-Stop Enable or Disable Function
    • Adjustable Soft-Start
    • Current Foldback Limits MOSFET Heat Dissipation During a Short-Circuit Condition
    • Overtemperature Protection
    • High Industrial Ambient Operating Temperature Range (-40°C to +125°C) and Junction Tempera- ture Range (-40°C to +150°C)

Product Details

The MAX17557 is a synchronous step-down controller that drives nMOSFETs. The device uses a constant-frequency, peak-current-mode architecture.

The IC supports current sensing using either an external current-sense resistor for accuracy or an inductor DCR for improved system efficiency. Current foldback limits MOSFET power dissipation under short-circuit conditions.

The IC can start up monotonically into a prebiased output. The device can be operated in forced pulse-width modulation (PWM), or discontinuous-conduction mode (DCM) to enable high efficiency under full-load and light-load conditions. The device features a programmable soft-stop enable (SSTPEN) or disable function.

The IC operates over the -40°C to +125°C temperature range and is available in a lead (Pb)-free, 20-pin TQFN, 4mm x 4mm package with an exposed pad.


  • Computerized Numerical Control
  • Distributed DC Power Systems
  • Industrial Power Supplies
  • Motion Control
  • Programmable Logic Controllers

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (2)

Tools & Simulations

EE-Sim® DC-DC Tool

The EE-Sim DC-DC Converter Tool uses your requirements to quickly create a complete power design including a schematic, BOM with commercially available parts, and time and frequency domain simulations. Your customized schematic can be downloaded for further analysis in the standalone EE-Sim OASIS Simulator , featuring SIMPLIS and SIMetrix SPICE engines.



MAX17557 SIMPLIS Schematic

MAX17557 SIMPLIS Schematic

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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