System Board 6791

MAXREFDES1200: Two-Layer Board, 3.3V/2.5A, Synchronous Buck DC-DC Converter Using the MAX17244

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Input Type VIN (MIN)
Isolated/Non-Isolated Topology
DC 12 32 2.5 Single 3.3 8.25 Non-Isolated Buck

The MAXREFDES1200 demonstrates how to build a lowcost buck DC-DC converter using the step-down converter MAX17244 for 3.3V DC output applications from a 12V to 32V input. This reference design delivers up to 2.5A at 3.3V. This design uses a two-layer board and minimizes component count to reduce cost. An overview of the design specification is shown in table above.

The MAX17244 high-efficiency, synchronous step-down DC-DC converter with integrated MOSFETs operates over a 3.5V to 36V input voltage range with 42V input transient protection. It uses a current-mode control architecture and can operate in the pulse-width modulation (PWM) or pulse-frequency modulation (PFM) control schemes. The device can operate in dropout conditions by running at 98% duty cycle. Under light-load applications, the external sync pin FSYNC logic input allows the device to operate either in PFM mode for reduced current consumption or fixed-frequency FPWM (forced-PWM) mode to eliminate frequency variation to minimize EMI. This converter delivers up to 2.5A and generates fixed output voltages of 3.3V/5V, along with the ability to program the output voltage between 1V to 10V. This device is available in a compact 16-pin (5mm x 5mm) TQFN package with exposed pad and 16-pin TSSOP.

MAXREFDES1200 Board Enlarge+

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Designed, Built, Tested

This reference design describes the hardware shown above. It provides a detailed systematic technical guide to design a buck converter using Maxim’s MAX17244 step-down controller. The power supply has been built and tested, details of which follow later in this document.

Design Resources


3.5V–36V, 2.5A, Synchronous Buck Converter With 28μA Quiescent Current and Reduced EMI

  • Eliminates External Components and Reduces Total Cost
  • Increases Design Flexibility
  • Reduces Power Dissipation