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Design of a Lithium-ion Battery Charger IC

Author: PengYing
Tutor: YingJianHua
School: Huazhong University of Science and Technology
Course: Microelectronics and Solid State Electronics
Keywords: Lithium ion battery Charger Quick charging technology Constant current charging Constant voltage charging Thermal limit Bandgap reference
CLC: TN492
Type: Master's thesis
Year: 2005
Downloads: 580
Quote: 3
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Abstract


The lithium-ion battery has a small size , light weight, high specific energy , long life , fast charge , etc. . Compared to other types of batteries , significantly superior overall performance , competitive advantage can not be ignored . It is characterized by the decision it requires the performance of a complete charge management chip . This paper discusses the design of a lithium-ion battery charger chip . The operating voltage of the charger for 5 V. The battery charging voltage is fixed at 4.2 V, the charging current can be externally set by a resistor . Programmable charge current up to 800 mA . For the charging characteristics of the battery , the chip design uses a lithium-ion fast charging technology : every stage of a charge based on the battery charger function , in order to achieve the purpose of rapid charging of battery safety . Based on this technology , the paper discusses in detail the system design of the charger chip : undervoltage lockout circuit detection charging conditions are met , the first low voltage battery trickle charge . When the battery voltage reaches a safe electrical usually constant current - constant voltage charging battery fast charging . When the final battery float voltage reaches 4.2 V , the charging process is terminated . The chip uses the termination of the minimum current constant voltage control to achieve high accuracy , thus effective use of the battery capacity and to prevent the battery from overcharge damage . The design integrates a the trickle / constant current charging , constant voltage charging technology and thermal limiting , and the design of the end-of-charge , and manually shut down the automatic restart function . Chip is designed in a BiCMOS bandgap reference voltage source generates a reference voltage of 1.21 V reference voltage , as in other parts of the circuit . Corresponds to a technology or function , the paper describes the structure and working principle of the circuit module . The chip design 0. 6μm BiCMOS mixed-signal model . Spectre simulator , by each module and the overall function of the circuit to verify the feasibility of the design .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Microelectronics, integrated circuit (IC) > ASIC
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