LT1513 Datasheet | Linear Technology

LT1513/LT1513-2 SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger Features s s s DESCRIPTION The LT ®1513 is a 500k Hz current mode switching regulator specially configured to create a constant- or programmable-current/constant-voltage battery charger. In addition to the usual voltage feedback node, it has a current sense feedback circuit for accurately controlling output current of a flyback or SEPIC (Single-Ended Primary Inductance Converter) topology charger. These topologies allow the current sense circuit to be ground referred and pletely separated from the battery itself, simplifying battery switching and system grounding problems. In addition, these topologies allow charging even when the input voltage is lower than the battery voltage. The LT1513 can also drive a CCFL Royer converter with high efficiency in floating or grounded mode. Maximum switch current on the LT1513 is 3A. This allows battery charging currents up to 2A for a single lithium-ion cell. Accuracy of 1% in constant-voltage mode is perfect for lithium battery applications. Charging current can be easily programmed for all battery types. , LTC and LT are registered trademarks of Linear Technology Corporation. s s s s s U APPLICATIONS s s s s s Charger Input Voltage May Be Higher, Equal to or Lower Than Battery Voltage Charges Any Number of Cells Up to 20V 1% Voltage Accuracy for Rechargeable Lithium Batteries 100m V Current Sense Voltage for High Efficiency (LT1513) 0m V Current Sense Voltage for Easy Current Programming (LT1513-2) Battery Can Be Directly Grounded 500k Hz Switching Frequency Minimizes Inductor Size Charging Current Easily Programmable or Shut Down Charging of Ni Cd, Ni MH, Lead-Acid or Lithium Rechargeable Cells Precision Current Limited Power Supply Constant-Voltage/Constant-Current Supply Transducer Excitation Universal Input CCFL Driver TYPICAL APPLICATION WALL ADAPTER INPUT - L1A- C2- - 4.7µF VSW 5 L1B- VFB IFB 3 2 R4 39Ω C4 0.22µF R3...