VA7205

VA7205_100-1.3_En ADVANCED LINEAR CHARGER IC For LITHIUM-ION AND LITHIUM-POLYMER Battery FEATURES Ideal for Single (4.2V) Li-ion or Li-Polymer Packs Better Than ±1% Voltage Regulation Accuracy With Preset Voltage www.DataSheet4U.com Adjustable precharge current with an external resistor Adjustable Charging Current During Constant Current Charging Stage Constant Voltage Charging Automatic Battery-Recharge Feature Cell-Temperature Monitoring Before and During Charge Dynamic compensation of Battery Pack’s Internal Impedance to Reduce Charge Time Charge Status Output for Dual Led Cell Condition Monitoring Automatic Low-Power Sleep Mode When Vcc is Removed or When Voltage Supply is Lower than battery voltage Requires Small Number of External Components Packaging: 8-Pin SOP or MSOP condition the battery. The conditioning charge rate can be adjusted with an external resistor. After the battery is precharged to Vmin, the VA7205 applies a constant current to the battery. An external sense-resistor sets the current. The constant-current phase continues until the battery reaches the charge-regulation voltage (normally at 4.2V) and then the VA7205 begins the constant-voltage phase. The accuracy of the voltage regulation is better than ±1% over the operating-temperature and supply-voltage ranges. Under this stage the charging current will gradually decrease. Charge stops when the current tapers to the charge termination threshold, ITERM. The VA7205 will continue...