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Reference Design for a High-Current Power Supply with Lossless Current Sensing Using the MAX5060

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Description

Introduction

Today's data processing elements demand higher currents from power supplies to achieve higher speed. Lossless current sensing and ground bouncing are key challenges for accurate control of output voltage and current in these applications.

The MAX5060 PWM buck power-supply controller uses an average-current-mode control technique to track the load current, and it employs differential sensing to accurately control the output voltage. In this reference design, the series resistance (DCR) of the inductor is used for current sensing to avoid power loss in the current-sense resistor.

This design shows a solution for implementing a high-current (30A) power supply with high system efficiency and good load regulation. The complete schematic, bill of materials (BOM), efficiency measurements, and test results are included below.

Specifications and Design Setup

This reference design achieves the following specifications.

  • Input voltage: 12V ±10%
  • Output voltage: 1.5V
  • Output current: 30A
  • Output ripple: ±15mV
  • Input ripple: ±250mV
  • Efficiency: > 88% with half of full load (15A)
  • Switching frequency: 275kHz
  • Footprint size: 5cm × 3.3cm

The schematic for this reference design is shown in Figure 1, and the BOM is given in Table 1. In this design, the MAX5060 is used in a buck configuration.

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Designed, Built, Tested

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

 

Maxim Devices (1)

Part Number Name Product Family Order Design kits and evaluation modules
MAX5060 0.6V to 5.5V Output, Parallelable, Average-Current-Mode DC-DC Controllers Switching Regulator - Switching Regulators Buy Now Design Kits

Maxim Devices (1)

Part Number Product Family
Switching Regulator - Switching Regulators
0.6V to 5.5V Output, Parallelable, Average-Current-Mode DC-DC Controllers

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