BATTERY VOLTAGE (V) LTC4065-4.4 Standalone 750mA Li-Ion Battery Charger in 2 2 DFN FEATURES DESCRIPTIO Complete Linear Charger in 2mm 2mm DFN The LTC 4065-4.4 is a complete constant-current/con- Package stant-voltage linear charger for high capacity single-cell C/10 Charge Current Detection Output lithium-ion batteries with a 4.4V float voltage. Its 2mm Timer Termination 2mm DFN package and low external component count Charge Current Programmable Up to 750mA with make the LTC4065-4.4 especially well-suited for portable 5% Accuracy applications. Furthermore, LTC4065-4.4 is specifically No External MOSFET, Sense Resistor or Blocking designed to work within USB power specifications. Diode Required The CHRG pin indicates when charge current has dropped Preset 4.4V Float Voltage with 0.6% Accuracy to ten percent of its programmed value (C/10). An internal Constant-Current/Constant-Voltage Operation with timer terminates charging according to battery manufac- Thermal Feedback to Maximize Charging Rate turer specifications. Without Risk of Overheating Charge Current Monitor Output for Gas Gauging No external sense resistor or blocking diode is required due Automatic Recharge to the internal MOSFET architecture. Thermal feedback regu- Charges Single-cell Li-Ion Batteries Directly from lates charge current to limit the die temperature during high USB Port power operation or high ambient temperature conditions. 20A Supply Current in Shutdown Mode When the input supply (wall adapter or USB supply) is Soft-Start Limits Inrush Current removed, the LTC4065-4.4 automatically enters a low cur- Tiny 6-Lead (2mm 2mm) DFN Package rent state, dropping battery drain current to less than U 1A. With power applied, LTC4065-4.4 can be put into shut- APPLICATIO S down mode, reducing the supply current to less than 20A. Wireless PDAs The full-featured LTC4065-4.4 also includes automatic Cellular Phones recharge, low-battery charge conditioning (trickle charg- Portable Electronics ing) and soft-start (to limit inrush current). , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, The LTC4065-4.4 is available in a tiny 6-lead, low profile including 6522118, 6700364. (0.75mm) 2mm 2mm DFN package. Complete Charge Cycle (1100mAh Battery) TYPICAL APPLICATIO 550 4.5 CONSTANT-CURRENT Standalone Li-Ion Battery Charger 500 4.4 CONSTANT- 450 4.3 VOLTAGE 500mA V 400 4.2 IN 4.5V TO V BAT CC 350 4.1 5.5V R1 LTC4065-4.4 300 4.0 510 250 3.9 CHRG PROG 4.4V CHRG + TRANSITION Li-Ion 200 3.8 EN GND C1 BATTERY* R3 150 3.7 1F 2k CHARGE 100 3.6 4065 TA01 TERMINATION V = 5V 50 CC 3.5 R = 2K PROG 0 3.4 *E.G. SANYO BATTERIES: UF553436T OR UF553450T 2 4.5 5 0 0.5 1 1.5 2.5 3 3.5 4 TIME (HOURS) 4065 TA01b 406544f 1 CHARGE CURRENT (mA) U ULTC4065-4.4 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW V CC t < 1ms and Duty Cycle < 1% ................. 0.3V to 7V GND 1 6 PROG Steady State ........................................... 0.3V to 6V CHRG 2 7 5 EN BAT, CHRG ................................................. 0.3V to 6V BAT 3 4 V CC EN, PROG ....................................... 0.3V to V + 0.3V CC BAT Short-Circuit Duration ...........................Continuous DC PACKAGE BAT Pin Current ................................................. 800mA 6-LEAD (2mm 2mm) PLASTIC DFN PROG Pin Current ............................................... 800A T = 125C, = 60C/W (NOTE 3) JMAX JA EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB Junction Temperature (Note 6)............................ 125C Operating Temperature Range (Note 2) .. 40C to 85C ORDER PART NUMBER DC PART MARKING Storage Temperature Range ................ 65C to 125C LTC4065EDC-4.4 LCKR Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: