ADP3804

= Preliminary Technical Data FEATURES Li-Ion Battery Charger Fixed 12,525 V, 12.600 V, or Adjustable Battery Voltage High End-of-Charge Voltage Accuracy ؎ 0.4% @ +25 ؇ C ؎ 0.6% @ 5 ؇ C to 55؇ C ؎ 0.75% @ 0؇ C to 85 ؇ C Programmable Charge Current with Rail-to-Rail Sensing System Current Sense with Reverse Input Protection Softstart Charge Current Undervoltage Lockout Boosted Synchronous Drive For External NMOS Programmable Oscillator Frequency Oscillator SYNC Pin Constant Current/Constant Voltage Flag Trickle Charge APPLICATIONS Portable Computers Fast Chargers High Frequency Switch Mode Li-Ion Battery Charger ADP3804 GENERAL DESCRIPTION Y R A N I L M A I L C I E PR CHN A TE DAT FUNCTIONAL BLOCK DIAGRAM BST DRVH SW DRVL PGND CS+ CS BOOSTED SYNCHRONOUS DRIVER AMP 1 The ADP3804 is a complete Li-Ion battery charging IC. The device combines high output voltage accuracy with constant current control to simplify the implementation of ConstantCurrent, Constant-Voltage (CCCV) chargers. The ADP3804 is available in two options. The ADP3804-12.6 guarantees the final battery voltage to 12.6 V ± 0.6%, the ADP3804-12.5 guarantees 12.525 V ± 0.6% and the ADP3804 is adjustable using two external resistors to set the battery voltage. The current sense amplifier has rail-to-rail inputs to accurately operate under low drop out and short circuit conditions. The charge current is programmable with a DC voltage on ISET. A second differential amplifier senses the system current across an externa...