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| LTC4079高效高壓線性充電解決方案 |
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| 文章來源： 更新時間：2015/2/2 12:35:00 |
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Linear公司的LTC4079是低靜態電流的高效高壓線性充電器,輸入電壓2.7V-60V,可調電池電壓從1.2V到60V,可調充電電流從10mA到250A,適用于大多數電池如鋰電池,鉛酸或鎳錳電池等.主要用在嵌入汽車電子和工業,能量收集充電器,薄膜電池產品和備用電池充電器.本文介紹了LTC4079主要特性,框圖,多種電池的典型應用電路以及演示板DC2133主要特性,電路圖和材料清單.
The LTCR4079 is a low quiescent current, high voltage linear charger for most battery chemistry types including Li-Ion/Polymer, Lead-Acid or NiMH battery stacks up to 60V. The maximum charge current is adjustable from 10mA to 250mA with an external resistor. The battery charge voltage is set using an external resistor divider.
With an integrated power device, current sensing and reverse current protection, a complete charging solution using the LTC4079 requires very few external components.
Thermal regulation ensures maximum charge current up to the specified limit without the risk of overheating. Charging can be terminated by either C/10 or adjustable timer.
Input voltage regulation reduces charge current when the input voltage falls to an adjustable level or the battery voltage, making it well suited for energy harvesting applications. Other features include temperature qualified charging, bad battery detection, automatic recharge with sampled feedback in standby for negligible battery drain, and an open-drain CHRG status output. The device is offered in a compact, thermally enhanced 10-lead (3mm× 3mm) DFN package.
LTC4079主要特性:
Wide Input Voltage Range: 2.7V to 60V
Adjustable Battery Voltage: 1.2V to 60V
Adjustable Charge Current: 10mA to 250mA
Low Quiescent Current While Charging: IIN = 4μA
Ultralow Battery Drain When Shutdown or Charged: IBAT < 0.01μA
Auto Recharge
Input Voltage Regulation for High Impedance Sources
Thermal Regulation Maximizes Output Current without Overheating
Constant Voltage Feedback with ±0.5% Accuracy
NTC Thermistor Input for Temperature Qualified Charging
Adjustable Safety Timer
Charging Status Indication
Thermally Enhanced 10-Lead (3mm × 3mm) DFN Package
LTC4079應用:
Embedded Automotive and Industrial
Backup Battery Charging from Another Battery
Energy Harvesting Charger
Thin Film Battery Products
圖1. LTC4079框圖
圖2. LTC4079采用24V AC整流的鉛酸電池涓流充電電路圖
圖3. LTC4079具有差分電壓穩壓的鋰電池充電電路圖
圖4. LTC4079具有定時端的鋰電池充電電路圖
圖5. LTC4079具有C/19端的超級電容充電器電路圖
圖6. LTC4079具有定時端的NiMH涓流充電器電路圖
演示板DC2133
Demonstration circuit 2133A features a simple battery charger circuit using the LTC®4079 high-voltage monolithic linear charger. The DC2133 has an input voltage range from 2.7V to 60V and is capable of supplying up to 250mA charge current. The charge voltage is jumperselectable to 4.2V or 8.4V. Charge current is adjustable via the PROG pin and initially programmed for 99mA. In shutdown or when unpowered, LTC4079 consumes only 10nA from the battery.
DC2133A is initially configured to enable charging from application of VIN above the LTC4079 UVLO threshold.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
演示板DC2133主要特性:
The NTC input is connected to an on-board resistance to enable charging with only a 2-wire battery connection; however an external thermistor may be used with the NTC test point.Termination is accomplished by timer method. Charging status is reflected by the CHRG LED.
圖7. 演示板DC2133測量建立圖
圖8. 演示板DC2133電路圖
演示板DC2133材料清單:
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