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MAXREFDES1049: Low EMI, 5V/3.5A, Synchronous Buck DC-DC Converter Using the MAX17504

MAXREFDES1049

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Description

The MAXREFDES1049 is a DC-DC buck power supply that delivers up to 3.5A at 5V from a 7.5V to 60V supply voltage. It is designed for equipment that needs to pass the electromagnetic interference (EMI) compliance testing.

The MAXREFDES1049 employs techniques that use the buck regulators to generate voltage lower than the input voltage. This document explains how the MAX17504 peakcurrent- mode PWM converter can be used to generate 5V from an input voltage of 7.5V to 60V. This document also illustrates how to achieve high EMI performance using a proper filter with good PCB layout and shielding techniques. This reference design passed the conducted emission (CE) test of CISPR 22 class B.

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 generate 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 device is available in a compact (5mm x 5mm) TQFN lead (Pb)-free package with an exposed pad. Simulation models are available.

The MAXREFDES1049 is a DC-DC buck power supply that delivers up to 3.5A at 5V from a 7.5V to 60V supply voltage. It is designed for equipment that needs to pass the electromagnetic interference (EMI) compliance testing.

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Designed, Built, Tested

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

 

Schematic

PCB Layout

Test Results

Parametrics

Input Type Vin(Min) Vin(Max) Iout(Max) Single/Multiple Output Vout(V) Pout(W) Isolated/Non-Isolated Topology
- 7.5 60 3.5 - 4.97 17.5 Non-Isolated -

Parametrics

Input Type -
Vin(Min) 7.5
Vin(Max) 60
Iout(Max) 3.5
Single/Multiple Output -
Vout(V) 4.97
Pout(W) 17.5
Isolated/Non-Isolated Non-Isolated
Topology -

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
maxrefdes1049-pcb PDF 2MB 2019-05-16
maxrefdes1049-schematic PDF 16KB 2019-05-16
MAXREFDES1049 Design Verification Testing PDF 268KB 2019-05-16
maxrefdes1049-bom PDF 91KB 2019-05-16
Date Type
2019-05-16

maxrefdes1049-pcb

(PDF, 2MB)

2019-05-16

maxrefdes1049-schematic

(PDF, 16KB)

2019-05-16

MAXREFDES1049 Design Verification Testing

(PDF, 268KB)

2019-05-16

maxrefdes1049-bom

(PDF, 91KB)

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