LTC4070

• Product Introduction

LTC4070 parallel lithium-ion/lithium-polymer battery charger system

peculiarity

• 低工作电流 (450nA)
• 在整个温度和并联电流范围内实现 1% 的浮置电压准确度
• 50mA 最大内部并联电流 (采用外部 PFET 时可达 500mA)
• 可通过引脚来选择的浮置电压：4.0V、4.1V、4.2V
• 用于提供锂离子 / 锂聚合物电池保护的超低功率脉动 NTC 浮置电压调节
• 适合于间歇、连续和非常低功率充电电源
• 低和高电池状态输出
• 简单的低电压负载断接应用
• 耐热性能增强型、扁平 (高度仅 0.75mm) 8 引脚 (2mm x 3mm) DFN 封装和 MSOP 封装

description

The LTC®4070 enables simple charging of lithium-ion/lithium-polymer batteries from very low-current, intermittent or continuous charging sources. Operating currents from 450nA to 50mA enable charging from previously unusable power sources. By adding an external path device, the shunt current can be increased to 500mA. When parallel charging is used, the inherent balance of the high-voltage battery pack of the stacked battery is achieved. With its low operating current, LTC4070 is well-suited for charging thin-film batteries in energy harvesting applications, where the charging power supply may be intermittent or very low-power. LTC4070's unique architecture results in an extremely simple battery charger solution; Only one external resistor is required.

LTC4070 provides a pin-selectable float voltage with an accuracy of up to 1% over the entire operating temperature and parallel current range. The device's integrated battery thermal suitability regulator extends battery life by automatically reducing the battery float voltage when the NTC thermistor temperature is above 40ºC. LTC4070 also offers low and high battery state outputs. For applications requiring package protection, refer to LTC4071.

The device is available in two thermally enhanced packages, a compact and low profile (only 0.75mm height) 8-pin (2mm x 3mm) DFN package, and an 8-pin MSOP package.