MCP73864T-I/ML

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Battery Chemistry:	Lithium-Ion/Polymer
Number of Cells:	2
Current - Charging:	Constant - Programmable
Programmable Features:	Timer
Fault Protection:	--
Charge Current - Max:	1.38A
Battery Pack Voltage:	8.4V
Voltage - Supply (Max):	12V
Interface:	--
Operating Temperature:	-40°C ~ 85°C (TA)
Package / Case:	16-VQFN Exposed Pad
Supplier Device Package:	16-QFN-EP (4x4)
Base Part Number:	MCP73864

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Introduction to MCP73864T-I/ML

TheMCP73864T-I/ML is a high performance battery management and charging IC intended for use in portable, single-cell Li-ion/Li-polymer battery applications, including PDAs, cell phones, digital cameras, and wearable electronics. The MCP73864T-I/ML provides a selectable linear and switch mode charging algorithm, supporting both fast battery charging, as well as smart termination for maximum battery life.The MCP73864T-I/ML is designed to offer low power dissipation charging, by automatically selecting a linear or switch mode charging algorithm that most closely meets the battery\'s charge requirements, while maintaining a low power dissipation profile. The IC also provides selectable input current limits without the need of an external sense resistor and current set resistor.

Application of MCP73864T-I/ML

TheMCP73864T-I/ML is a highly integrated battery charger for single-cell Li-ion/Li-polymer applications. It is specifically designed for applications such as cell phones, PDAs, digital cameras, and other portable electronics. It provides an integrated battery management system that offers robust charging control. The charger features an adjustable charge current, programmable charger termination and a selectable linear or switch mode charging topology. This IC is intended to be used in applications where the 5V source is either USB or AC adapters.In addition to its built-in safety features, such as short-circuit protection and under-voltage protection, the MCP73864T-I/ML includes charging Status and Error indications, as well as Battery Temperature monitoring. The device also includes charge Termination and Trickle Charging capabilities. Additionally, there is an independent Status pin to monitor both charge status and charge current, making the MCP73864T-I/ML ideal for use in a wide range of Li-ion/Li-polymer charging applications.

Features of MCP73864T-I/ML

TheMCP73864T-I/ML offers an integrated battery management system with a highly efficient charging topology and multiple integrated safety features. Some key features of the IC are:• Operating input voltage range from 4.5V to 24V• Selectable linear or switch mode charging• Adjustable charge current• Programmable charge termination• Independent charge status pin• Low power dissipation charging• Withstands reverse-polarity conditions• Built-in short-circuit and under-voltage protection• Battery temperature monitoring• Trickle charging capabilityIn addition to the features already mentioned, the MCP73864T-I/ML also offers an integrated reverse-polarity protection (RPP) circuit, an under-voltage lockout (UVLO) circuit, an op-amp buffer, and a temperature sensor.

Working Principle of MCP73864T-I/ML

The MCP73864T-I/ML implements a selectable linear or switch-mode charging algorithm to charge the battery. The selectable charging algorithm is based on the state of the BAT pin, which is pulled high to force switch-mode charging, or pulled low to enable linear charging. Depending on the algorithm selected, the charger performs different charging functions.At the start of the charge cycle, the charge current is set by the value of a capacitor connected between the input and output of the Charge Current Set pin (CCS). When the BAT pin is pulled high, switch-mode charging is enabled and the Charger generates two phases of pulse width modulation (PWM) pulses, which increase or decrease the charge current based on the battery\'s state of charge.When the BAT pin is pulled low, linear charging is enabled. In this mode, the charge current is set by the resistance between the CCS and ground, and the charger monitors the current by measuring the voltage across the CCS. When the battery reaches a full charge, the charge termination is set by the voltage of the Termination pin (TERM), with a typical voltage of 4.2V. When the Termination voltage is reached, the charger stops supplying current to the battery and switches to the trickle charging mode.

Conclusion

TheMCP73864T-I/ML is a highly integrated battery charger for single-cell Li-ion/Li-polymer applications. The device offers a selectable linear and switch mode charging algorithm for fast and safe battery charging, as well as smart termination for maximum battery life. The charger also features a low power dissipation, selectable input current limits, and integrated safety features, such as short-circuit protection and under-voltage protection. With its wide range of features, the MCP73864T-I/ML is an ideal choice for battery charging applications in various portable electronic devices.

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