VA7208

VA7208 Advanced Linear Charger IC for Lithium-ion and Lithium-polymer Battery FEATURES 4.5V to 12V input voltage range „ Ideal for single (4.2V) Li-ion or Li-polymer battery packs „ „ „ „ „ „ „ „ „ combines high-accuracy current, voltage regulation, charge termination, and charge status indication in a single 8-pin IC. It is the best suitable device to be used in PDA, mobile phone, and other portable devices. VA7208 monitors the battery charging status by detecting the battery voltage. VA7208 charges the battery in three phases: conditioning, constant current and constant voltage. If the battery voltage (VBAT) is below the preconditioning voltage threshold (VMIN), VA7208 precharges the battery using a low current. When the battery voltage reaches VMIN, VA7208 applies a constant current to charge the battery. An external sense resistor controls the current. The constant current charging continues until the battery voltage reaches the voltage regulation threshold (VREG). And then VA7208 enters the constant voltage charging phase. The accuracy of the voltage regulation is better than ±1% over the operating temperature and supply voltage range. Under the condition, the charging current gradually decreases. Charge stops when the current tapers to the charge termination threshold, ITERM. VA7208 monitors the battery voltage continuously and enters a new cycle of charging if the battery’s voltage falls below the recharge voltage threshold (VRECHG). VA7208 is available in a small 8-...