PT6112

PT6112 Standalone Linear Li-Ion Battery Charger with Thermal Regulation GENERAL DESCRIPTION The PT6112 is a highly integrated Li-ion battery linear charging management device targeted at space limited portable applications. The PT6112 offers an integrated MOSFET and current sensor, reverse blocking protection, high accuracy current and voltage regulation, charge status indication, and charge termination in a SOT23 or ESOP8 package. The PT6112 has low external component count. The PT6112 charges a battery in three phases: trickle charging, constant current, and constant voltage. No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. The thermal feedback regulates the charging current to limit the chip temperature during high power operation or high ambient temperature to maximize the charge rate without risk of overheating. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The PT6112 automatically terminates the charge cycle when the charge current drops to 1/10 the programmed value after the final float voltage is reached. The PT6112 automatically re-starts the charge if the battery voltage falls below an internal threshold. FEATURES z z z z z Charges Single Cell Li-Ion Batteries Directly from Programmable Charge Current Up to 800mA No MOSFET, Sense Resistor or Blocking Diode Complete Linear Charger in SOT23-5 or ESOP8 Constant-Current/Constant-Voltage Ope...