Linear公司的LTC4000是高压高性能电池充电控制器,输入和输出电压宽达3V到60V,输入和充电电流精度在±1%,可编程浮电压精度±0.25%,可选择的定时器和终止充电电流,采用NTC热电阻的温度补偿充电,自动再充电,不良电池检测和用于深度放电电池的C/10涓流充电以及状态指示输出.主要用在大功率电池充电系统,高性能手持仪表,笔记本/亚笔记本电脑等.本文介绍了LTC4000主要特性,方框图, 用于三个LiFePO4电池的48-10.8V/10A降压充电器电路图以及用于单个和多个锂离子电池充电器电路图.

The LTC®4000 is a high voltage, high performance controller that converts many externally compensated DC/DC power supplies into full-featured battery chargers. Features of the LTC4000’s battery charger include: accurate (±0.25%) programmable float voltage, selectable timer or current termination, temperature qualified charging using an NTC thermistor, automatic recharge, C/10 trickle charge for deeply discharged cells, bad battery detection and status indicator outputs. The battery charger also includes precision current sensing that allows lower sense voltages for high current applications.

The LTC4000 supports intelligent PowerPath control. An external PFET provides low loss reverse current protection.Another external PFET provides low loss charging or discharging of the battery. This second PFET also facilitates an instant-on feature that provides immediate downstream system power even when connected to a heavily discharged or short faulted battery.

The LTC4000 is available in a low profile 28-lead 4mmx5mm QFN and SSOP packages.

LTC4000主要特性:

Complete High Performance Battery Charger When Paired with a DC/DC Converter

Wide Input and Output Voltage Range: 3V to 60V

Input Ideal Diode for Low Loss Reverse Blocking and Load Sharing

Output Ideal Diode for Low Loss PowerPath™ and Load Sharing with the Battery

Instant-On Operation with Heavily Discharged Battery

Programmable Input and Charge Current:±1% Accuracy

±0.25% Accurate Programmable Float Voltage

Programmable C/X or Timer Based Charge Termination

NTC Input for Temperature Qualified Charging

28-Lead 4mm 5mm QFN or SSOP Packages

LTC4000应用:

High Power Battery Charger Systems

High Performance Portable Instruments

Industrial Battery Equipped Devices

Notebook/Subnotebook Computers

图1.LTC4000方框图

图2.LTC4000用于三个LiFePO4电池的48-10.8V/10A降压充电器电路图(1)

图3.用于LTC4000的Kelvin检测线的配置框图

图4.LTC4000用于三个LiFePO4电池的48-10.8V/10A降压充电器电路图(2)

图5.LTC4000用于五个锂离子电池的6-12V/5A降压充电器电路图

图6.LTC4000用于单个锂离子电池的18V-72VIN输入的4.2V/5A绝缘反激充电器电路图