ADP5065ACBZ-1-R7 datasheet(15/40 Pages) AD

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Data Sheet

ADP5065

Rev. D | Page 15 of 40

THEORY OF OPERATION

INTRODUCTION

The ADP5065 is a fully I2C-programmable charger for single-

cell lithium-ion or lithium-polymer batteries suitable for a wide

range of portable applications.

The highly efficient switcher dc-to-dc architecture enables higher

charging currents as well as a lower temperature charging

operation that results in faster charging times because of the

following features:

•

3 MHz switch mode charger.

•

1.25 A charge current from dedicated charger.

•

Up to 680 mA of charging current from a 500 mA

USB host.

The ADP5065 operates from an input voltage from 4 V to 5.5 V

but is tolerant of voltages of up to 20 V. This alleviates the concern

about USB bus spiking during disconnection or connection

scenarios.

The ADP5065 features an internal FET between the dc-to-dc

charger output and the battery. This permits battery isolation

and, hence, system powering in a dead battery or no battery

scenario, which allows for immediate system function on

connection to a USB power supply.

The ADP5065 is fully compliant with the USB 3.0 battery charging

specification and enables charging via the mini USB VBUS pin

from a wall charger, car charger, or USB host port. Based on the

type of USB source, which is detected by an external USB

detection device, the ADP5065 can be set to apply the correct

current limit for optimal charging and USB compliance. The USB

charger permits correct operation under all USB compliant

sources such as, wall chargers, host chargers, hub chargers, and

standard hosts and hubs.

A processor is able to control the USB charger using the I2C to

program the charging current and numerous other parameters

including

•

Trickle charge current level.

•

Trickle charge voltage threshold.

•

Weak charge (constant current) charge current level.

•

Fast charge (constant current) charge current level.

•

Fast charge (constant voltage) charge voltage level at 1%

accuracy.

•

Fast charge safety timer period.

•

Watchdog safety timer parameters.

•

Weak battery threshold detection.

•

Charge complete threshold.

•

Recharge threshold.

•

Charge enable/disable.

•

Battery pack temperature detection and automatic charger

shutdown.

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