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LT1513 Dataheets PDF



Part Number LT1513
Manufacturers Linear Technology
Logo Linear Technology
Description SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger
Datasheet LT1513 DatasheetLT1513 Datasheet (PDF)

LT1513/LT1513-2 SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger FEATURES s s s DESCRIPTION The LT ®1513 is a 500kHz 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 top.

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LT1513/LT1513-2 SEPIC Constant- or Programmable-Current/ Constant-Voltage Battery Charger FEATURES s s s DESCRIPTION The LT ®1513 is a 500kHz 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 completely 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 100mV Current Sense Voltage for High Efficiency (LT1513) 0mV Current Sense Voltage for Easy Current Programming (LT1513-2) Battery Can Be Directly Grounded 500kHz Switching Frequency Minimizes Inductor Size Charging Current Easily Programmable or Shut Down Charging of NiCd, NiMH, 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 0.08Ω LT1513 • TA01 2.4 + C3 22µF 25V 7 VIN LT1513 6 S/S GND 4 TAB VC 1 R5 270Ω C5 0.1µF D1 † 2.2 1.25A CURRENT (A) 2.0 1.8 CHARGE SYNC AND/OR SHUTDOWN SHUTDOWN R1 • R2 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0 5 + C1 22µF 25V ×2 * L1A, L1B ARE TWO 10µH WINDINGS ON A COMMON CORE: COILTRONICS CTX10-4 ** CERAMIC MARCON THCR40EIE475Z OR TOKIN 1E475ZY5U-C304 † MBRD340 OR MBRS340T3. MBRD340 HAS 5µA TYPICAL LEAKAGE, MBRS340T3 50µA TYPICAL Figure 1. SEPIC Charger with 1.25A Output Current INDUCTOR = 10µH ACTUAL PROGRAMMED CHARGING CURRENT WILL BE INDEPENDENT OF INPUT VOLTAGE IF IT DOES NOT EXCEED VALUES SHOWN LT1513 • TA02 U U Maximum Charging Current SINGLE Li-Ion CELL (4.1V) DOUBLE Li-Ion CELL (8.2V) 12V 16V 20V BATTERY VOLTAGE 10 20 15 INPUT VOLTAGE (V) 25 30 1 LT1513/LT1513-2 ABSOLUTE AXI U RATI GS Operating Junction Temperature Range LT1513C ............................................... 0°C to 125°C LT1513I ............................................ – 40°C to 125°C Short Circuit ....


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