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MAXREFDES1221: Boosting the Single-Output, 2.6V to 4.5V Input, 12V/833mA Output DC-DC Converter Using the MAX669

MAXREFDES1221

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Description

Introduction

This reference design boosts a single-cell battery voltage to a 10W output using the MAX669 controller in the bootstrapped mode. The bootstrap on the input allows the circuit to continue regulating for very low-input voltages.

This circuit boosts to 12V, 0.833A on the output for a 2.6V to 4.5V input. The MAX669 IC in this design is a constant-frequency, pulse-width modulating (PWM), and current-mode DC-DC controller. It can be used for a wide range of DC-DC conversion applications including step-up, SEPIC, flyback, and isolated-output configurations. Power levels of 20W or more can be controlled with conversion efficiencies of over 90%.

Key Features

  • Tiny 10-pin μMAX package
  • Low-input voltage range
  • Current-mode PWM and idle-mode operation
  • 220μA quiescent current
  • Logic-level shutdown
  • Soft-start
  • High efficiency

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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

Maxim Devices (1)

Part Number Name Product Family Order Design kits and evaluation modules
MAX669 1.8V to 28V Input, PWM Step-Up Controllers in µMAX Switching Regulator - Switching Regulators Buy Now Design Kits

Maxim Devices (1)

Part Number Product Family
Switching Regulator - Switching Regulators
1.8V to 28V Input, PWM Step-Up Controllers in µMAX

Design Files (4)

Title Type Size Date
MAXREFDES1221 Test Results PDF 515KB 2021-11-21
MAXREFDES1221 BOM CSV 2KB 2021-11-21
MAXREFDES1221 PCB Layout PDF 457KB 2021-11-21
MAXREFDES1221 Schematic PDF 16KB 2021-11-21
Date Type
2021-11-21

MAXREFDES1221 Test Results

(PDF, 515KB)

2021-11-21

MAXREFDES1221 BOM

(CSV, 2KB)

2021-11-21

MAXREFDES1221 PCB Layout

(PDF, 457KB)

2021-11-21

MAXREFDES1221 Schematic

(PDF, 16KB)

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