MAX8725ETI+

Series:	--
Packaging:	Tube
Part Status:	Active
Battery Chemistry:	Multi-Chemistry
Number of Cells:	--
Current - Charging:	Constant - Programmable
Programmable Features:	--
Fault Protection:	--
Charge Current - Max:	4A
Battery Pack Voltage:	17.65V (Max)
Voltage - Supply (Max):	28V
Interface:	--
Operating Temperature:	-40°C ~ 85°C (TA)
Package / Case:	28-WFQFN Exposed Pad
Supplier Device Package:	28-TQFN (5x5)
Base Part Number:	MAX8725

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Introduction

The MAX8725ETI+ is a programmable precision DC-to-DC battery charger with integrated high-efficiency current-limited buck converters and Li-Ion/Li-polymer battery pack controllers. This device offers a configurable charging cycle, including cut-off current, and is designed for a very wide range of battery applications from 2.5V to 5.5V. It is the ideal solution for achieving fast and safe charging of portable electronic applications such as cellular phones, PDAs, and digital cameras.

PMIC - Battery Chargers

PMIC (Power Management Integrated Circuits) are specialized devices that provide the means to control, manage, monitor and protect the power supply of electronic systems. Battery chargers are a subset of PMICs which are used to provide power to the system through charging of a variety of battery chemistries. In the case of the MAX8725ETI+, it is an integrated battery charger capable of charging a wide variety of battery chemistries, ranging from Li-Ion/Li-polymer to NiMH and NiCd cell chemistries.

MAX8725ETI+ Application Field

The MAX8725ETI+ offers a wide range of features and functions which make it an ideal solution for various applications. It offers a configurable charging cycle which allows for the selection of charging currents and voltages to match the battery chemistry. It also provides over voltage, short circuit, and thermal protection for improved safety and reliability. In addition, the device provides a low battery lockout function which prevents charge current from entering the battery in case of low battery voltages. The charger is suitable for use in portable devices such as cellular phones, PDA’s and digital cameras, as well as a variety of home appliances and industrial applications.

MAX8725ETI+ Working Principle

At its core, the MAX8725ETI+ is a programmable precision DC-to-DC battery charger. It operates by charging a wide variety of battery chemistries including Li-Ion/Li-polymer, NiMH and NiCd cell. The charger operates in two modes depending on the type of battery connected.In the Li-Ion/Li-polymer mode, the charger operates in two steps. In the first step, it charges the battery with a constant current up to a certain maximum voltage. In the second step, the charge voltage is held constant, and the charge current is then ramped down to a minimum level. In the NiMH/NiCd mode, the charge voltage is held constant, and the charge current is maintained constant until the battery reaches the programmed maximum voltage.The charger includes a number of safety features including an over-voltage and an over-temperature protection, as well as a low battery lockout feature to prevent the charge current from entering the battery in case of low battery voltages.

Conclusion

The MAX8725ETI+ is a programmable precision DC-to-DC battery charger with integrated high-efficiency current-limited buck converters and Li-Ion/Li-polymer battery pack controllers. It offers a configurable charging cycle for a wide range of battery chemistries, including Li-Ion/Li-polymer and NiMH/NiCd cell chemistries. It also provides over-voltage, short circuit, and thermal protection for improved safety and reliability. The device is suitable for use in a variety of portable, home and industrial applications.

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