MAXREFDES1016: 6.6W Dual-Phase Buck Converter Using MAX17509


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The MAX17509 integrates two 3A internal switch stepdown regulators with programmable features. The device can be configured as two single-phase 3A power supplies or as one dual-phase, single-output 6A power supply. It operates from a 4.5V to 16V input and generates independently adjustable output voltage in the ranges of 0.904V to 3.782V and 4.756V to 5.048V, with ±2% system accuracy. This device provides maximum flexibility to the end-user by allowing to choose multiple programmable options by connecting resistors to the configuration pins. Two key highlights of the device are the self-configured compensation for any output voltage and the ability to program the slew rate of LX switching nodes to mitigate noise and EMI concerns. Noise-sensitive applications, such as high-speed multi-gigabit transceivers in FPGAs, RF, and audio applications, can benefit from this unique slew-rate control. SYNC input is provided for synchronized operation of multiple devices with system clocks.

The MAX17509 offers output overvoltage (OV) and undervoltage (UV) protection, as well as overcurrent (OC) and undercurrent (UC) protection with a selectable hiccup/latch option.


  • Reduces Number of DC-DC Regulators in Inventory
  • Output Voltage (0.904V to 3.782V and 4.756V to 5.048V with 20mV Resolution)
  • Configurable Two Independent Outputs (3A/3A) or a Dual-Phase Single Output (6A)
  • Mitigate Noise Concerns and EMI
  • Adjustable Switching Frequency with Selectable 0/180° Phase Shift
  • External Frequency Synchronization
  • Adjustable Switching Slew Rate
  • Passes EN55022 (CISPR22) Class-B Radiated and Conducted EMI Standard
  • Ease of System Design
  • All Ceramic Capacitors Solution
  • Auto-Configured Internal Compensation Selectable Hiccup or Brick-Wall Mode
  • Adjustable Soft-Start Rise/Fall Time with Soft-Stop Modes and Prebias Startup


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 4.5 16 6 - 1.1 6.6 Non-Isolated Synchronous Buck


Input Type DC
Vin(Min) 4.5
Vin(Max) 16
Iout(Max) 6
Single/Multiple Output -
Vout(V) 1.1
Pout(W) 6.6
Isolated/Non-Isolated Non-Isolated
Topology Synchronous Buck

Maxim Devices (1)

Part Number Name Product Family Order Design kits and evaluation modules
MAX17509 4.5V–16V, Dual 3A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Resistor Programmability Switching Regulator - Switching Regulators Buy Now Design Kits

Maxim Devices (1)

Part Number Product Family
Switching Regulator - Switching Regulators
4.5V–16V, Dual 3A, High-Efficiency, Synchronous Step-Down DC-DC Converter with Resistor Programmability

Design Files (4)

Title Type Size Date
maxrefdes1016-schematic PDF 287KB 2019-07-09
maxrefdes1016-pcb PDF 2MB 2019-07-09
marcom_bom_max17509_maxrefdes1016_demo_p1.csv PDF 208KB 2019-07-09
maxrefdes1016-test-results PDF 208KB 2019-07-09
Date Type


(PDF, 287KB)



(PDF, 2MB)



(PDF, 208KB)



(PDF, 208KB)

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