Linear公司的LTC4000是高壓高性能電池充電控制器,輸入和輸出電壓寬達3V到60V,輸入和充電電流精度在±1%,可編程浮電壓精度±0.25%,可選擇的定時器和終止充電電流,采用NTC熱電阻的溫度補償充電,自動再充電,不良電池檢測和用于深度放電電池的C/10涓流充電以及狀態指示輸出.主要用在大功率電池充電系統,高性能手持儀表,筆記本/亞筆記本電腦等.本文介紹了LTC4000主要特性,方框圖, 用于三個LiFePO4電池的48-10.8V/10A降壓充電器電路圖以及用于單個和多個鋰離子電池充電器電路圖.
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應用:
High Power Battery Charger Systems
High Performance Portable Instruments
Industrial Battery Equipped Devices
Notebook/Subnotebook Computers
圖1.LTC4000方框圖
圖2.LTC4000用于三個LiFePO4電池的48-10.8V/10A降壓充電器電路圖(1)
圖3.用于LTC4000的Kelvin檢測線的配置框圖
圖4.LTC4000用于三個LiFePO4電池的48-10.8V/10A降壓充電器電路圖(2)
圖5.LTC4000用于五個鋰離子電池的6-12V/5A降壓充電器電路圖
圖6.LTC4000用于單個鋰離子電池的18V-72VIN輸入的4.2V/5A絕緣反激充電器電路圖 |
