MAXREFDES1048: Two-Layer Board, 3.3V/3A, Wide-Input, Synchronous, Step-Down DC-DC Converter Using the MAX17504


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The MAX17504 high-efficiency, high-voltage, synchronously rectified step-down converter with dual integrated MOSFETs operates over a 4.5V to 60V input. The converter can deliver up to 3.5A and generates output voltage from 0.9V to 90% VIN. Built-in compensation across the output voltage range eliminates the need for external components. The feedback (FB) regulation is accurate to within ±1.1% over -40°C to +125°C. The devices are available in a compact (5mm x 5mm) TQFN lead (Pb)- free package with an exposed pad. Simulation models are available. The MAX17504 features a peak-current-mode control architecture with a MODE feature that can be used to operate the device in pulse-width modulation (PWM), pulse-frequency modulation (PFM), or discontinuous mode (DCM) control schemes.

PWM operation provides constant frequency operation at all loads and is useful in applications sensitive to switching frequency. PFM operation disables negative inductor current and skips pulses at light loads for high efficiency, allowing the DCM to feature constant frequency operation down to lighter loads than PFM mode. A programmable soft-start feature allows users to reduce input inrush current. The device also incorporates an output enable/ undervoltage lockout pin (EN/UVLO) that allows the user to turn on the part at the desired input voltage level. An open-drain RESET pin provides a delayed power-good signal to the system upon achieving successful regulation of the output voltage.


  • Eliminates External Components and Reduces Total Cost
  • Reduces Number of DC-DC Regulators to Stock
  • Reduces Power Dissipation
  • Operates Reliably


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 18 36 3 - 3.3 9.9 Non-Isolated Synchronous Buck


Input Type DC
Vin(Min) 18
Vin(Max) 36
Iout(Max) 3
Single/Multiple Output -
Vout(V) 3.3
Pout(W) 9.9
Isolated/Non-Isolated Non-Isolated
Topology Synchronous Buck

Maxim Devices (1)

Part Number Name Product Family Order Design kits and evaluation modules
MAX17504 4.5V–60V, 3.5A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation Switching Regulator - Switching Regulators Buy Now Design Kits

Maxim Devices (1)

Part Number Product Family
Switching Regulator - Switching Regulators
4.5V–60V, 3.5A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Internal Compensation

Design Files (4)

Title Type Size Date
maxrefdes1048-test-results PDF 558KB 2019-07-09
maxrefdes1048-pcb PDF 1MB 2019-07-09
maxrefdes1048-bom PDF 202KB 2019-07-09
maxrefdes1048-schematic PDF 14KB 2019-07-09
Date Type


(PDF, 558KB)



(PDF, 1MB)



(PDF, 202KB)



(PDF, 14KB)

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