Linear公司的LTC4000-1是高压高性能转换器,能把许多外部补偿的DC/DC电源转换成全特性的电池充电器,并具有最大功率点控制.其最大功率点控制和太阳能板输入兼容,输入电压3V-36V,可编程充电精度±1%,可编程浮电压精度±0.25%,主要用在太阳能电池充电系统,高阻抗输入源如燃料电池或风能的电池充电器,工业电池设备或手持军用设备.本文介绍了LTC4000-1主要特性,框图和多种应用电路图.
The LTC®4000-1 is a high voltage, high performance controller that converts many externally compensated DC/DC power supplies into full-featured battery chargers with maximum power point control. In contrast to the LTC4000, the LTC4000-1 has an input voltage regulation loop instead of the input current regulation loop.
Features of the LTC4000-1’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 LTC4000-1 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 shorted battery.
The LTC4000-1 is available in a low profile 28-lead 4mmx5mm QFN and SSOP packages.

LTC4000-1主要特性:
Maximum Power Control: Solar Panel Input Compatible
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
Programmable 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 x5mm QFN or SSOP Packages

LTC4000-1应用:
Solar Powered Battery Charger Systems
Battery Charger with High Impedance Input Source, e.g., Fuel Cell or Wind Turbine
Battery Equipped Industrial or Portable Military Equipments

图1.LTC4000-1功能框图

图2.LTC4000-1采用太阳能板对三节LiFePO4电池充电电路:10.8V/10A

图3.LTC4000-1采用太阳能板对六节铅酸电池充电电路

图4.LTC4000-1采用太阳能板,燃料电池或风能对五节锂电池充电电路:21V/5A

图5.LTC4000-1单个锂电池充电电路:输入18V-27V,输出4.2V/2A,2.9小时定时器,充电涓流0.22A