MAXREFDES1039: 64W and 48W Dual Output DC-DC Buck Converter Using the MAX17559


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The MAX17559 is a dual-output, synchronous step-down controller that drives nMOSFETs. The device uses a constant- frequency, peak-current-mode architecture. The two outputs can be configured as independent voltage rails. Input capacitor size is minimized by running the two outputs 180° out of phase. The IC supports current sensing using either an external current-sense resistor for accuracy or an inductor DCR for improved system efficiency. Current foldback or latch-off limits MOSFET power dissipation under short-circuit conditions. The IC provides independent adjustable soft-starts/stops for each output and can start up monotonically into a pre-biased output. The IC can be configured in either PWM or DCM modes of operation, depending on whether constant-frequency operation or light-load efficiency is desired. The IC operates over the -40°C to +125°C temperature range and is available in a lead(Pb)-free, 7mm x 7mm, 32-pin TQFP, package.


  • Wide 4.5V to 60V Input Voltage Range
  • Wide 0.8V to 24V Output Voltage Range
  • RSENSE or Inductor DCR Current-Sensing
  • Fixed 180° Out-of-Phase Operation
  • Adjustable 100kHz to 2.2MHz Switching Frequency
  • Independent Enable and PGOOD
  • Available in a Lead(Pb)-Free 7mm x 7mm, 32-Pin TQFP 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
  • Independent Adjustable Soft-Start/Stop or Tracking
  • Current Selectable Foldback or Latch-off Limits
  • MOSFET Heat Dissipation During a Short-Circuit Condition
  • Operates Over the -40°C to +125°C Temperature Range
  • Output Overvoltage and Overtemperature Protections


Designed, Built, Tested

Board pictured here has been fully assembled and tested. Not available for sale.



Input Type Vin(Min) Vin(Max) Iout(Max) Single/Multiple Output Vout(V) Pout(W) Isolated/Non-Isolated Topology
DC 36 51 4 - 16 - Non-Isolated Synchronous Buck


Input Type DC
Vin(Min) 36
Vin(Max) 51
Iout(Max) 4
Single/Multiple Output -
Vout(V) 16
Pout(W) -
Isolated/Non-Isolated Non-Isolated
Topology Synchronous Buck

Maxim Devices (1)

Part Number Name Product Family Order Design kits and evaluation modules
MAX17559 60V, Dual-Output, Synchronous Step-Down Controller Switching Regulator - Switching Regulators Buy Now Design Kits

Maxim Devices (1)

Part Number Product Family
Switching Regulator - Switching Regulators
60V, Dual-Output, Synchronous Step-Down Controller

Design Files (4)

Title Type Size Date
maxrefdes1039-pcb PDF 2MB 2019-07-09
TTS MAXREFDES Test Results Template_Rev 0_0318 PDF 304KB 2019-07-09
maxrefdes1039-schematic PDF 167KB 2019-07-09
maxrefdes1039-bom PDF 218KB 2019-07-09
Date Type


(PDF, 2MB)


TTS MAXREFDES Test Results Template_Rev 0_0318

(PDF, 304KB)



(PDF, 167KB)



(PDF, 218KB)

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