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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 158

Supply 2A pulses for GSM transmission from 500mA USB or PCMCIA ports

Dongyan Zhou

Abstract

The LTC3440 synchronous buck-boost converter that provides an optimal solution for GSM modems and USB OTG devices is described.

Keywords

Synchronous buck-boost controller

GSM modem

OTG USB

LTC3440

Introduction

GSM modems have become popular as a wireless data transfer solution; however, they frequently require large bursts of current that exceed the maximum input current available to the voltage regulator. Many can be powered from a USB port (4.5V to 5.5V input) or a PCMCIA port (3V to 3.6V input), where 3.xV is required to supply the RF power amplifier that draws current pulses up to 2A. Since the input from the USB or PCMCIA port ...

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