LTC4075/LTC4075X Dual Input USB/AC Adapter Standalone Li-Ion Battery Chargers DESCRIPTIO FEATURES Charges Single-Cell Li-Ion Batteries from Wall The LTC 4075/LTC4075X are standalone linear chargers Adapter and USB Inputs that are capable of charging a single-cell Li-Ion battery Automatic Input Power Detection and Selection from both wall adapter and USB inputs. The chargers can Charge Current Programmable up to 950mA from detect power at the inputs and automatically select the Wall Adapter Input appropriate power source for charging. No External MOSFET, Sense Resistor or Blocking No external sense resistor or blocking diode is required Diode Needed for charging due to the internal MOSFET architecture. Thermal Regulation Maximizes Charging Rate Internal thermal feedback regulates the battery charge Without Risk of Overheating* current to maintain a constant die temperature during high Preset Charge Voltage with 0.6% Accuracy power operation or high ambient temperature conditions. Programmable Charge Current Termination The oat voltage is xed at 4.2V and the charge current 18A USB Suspend Current in Shutdown is programmed with an external resistor. The LTC4075 Independent Power Present Status Outputs terminates the charge cycle when the charge current drops Charge Status Output below the programmed termination threshold after the Automatic Recharge nal oat voltage is reached. With power applied to both Available Without Trickle Charge (LTC4075X) inputs, the LTC4075/LTC4075X can be put into shutdown Available in a Thermally Enhanced, Low Pro le mode reducing the DCIN supply current to 20A, the USBIN (0.75mm) 10-Lead (3mm 3mm) DFN Package supply current to 10A, and the battery drain current to less than 2A. U APPLICATIO S Other features include automatic recharge, undervoltage lockout, charge status outputs, and power present Cellular Telephones status outputs to indicate the presence of wall adapter Handheld Computers or USB power. Portable MP3 Players , LTC and LT are registered trademarks of Linear Technology Corporation. Digital Cameras All other trademarks are the property of their respective owners. *Protected by U.S. patents, including 6522118, 6700364 Complete Charge Cycle (1100mAh Battery) TYPICAL APPLICATIO 1000 800 Dual Input Battery Charger for Single-Cell Li-Ion 600 400 200 800mA (WALL) 0 LTC4075 500mA (USB) WALL CONSTANT VOLTAGE 4.2 ADAPTER DCIN BAT 4.0 USBIN = 5V USB USBIN 3.8 4.2V + T = 25C PORT 1F A SINGLE CELL 3.6 IUSB R = 1.25k IDC Li-Ion BATTERY 3.4 R = 2k 2k IUSB IDC ITERM 1F 5.0 1% 1.24k GND 2k 2.5 1% 1% 0 2.5 4075 TA01 0 0.5 1.0 1.5 2.0 2.5 3.0 TIME (HR) 4075 TA01b 4075Xfa 1 DCIN BATTERY CHARGE VOLTAGE (V) VOLTAGE (V) CURRENT (mA) U ULTC4075/LTC4075X UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW Input Supply Voltage (DCIN, USBIN) ........... 0.3 to 10V USBIN 10 DCIN ENABLE, CHRG, PWR, USBPWR ................. 0.3 to 10V 1 IUSB 2 9 BAT BAT, IDC, IUSB, ITERM .................................. 0.3 to 7V ITERM 3 11 8 IDC DCIN Pin Current (Note 7) ..........................................1A PWR 4 7 USBPWR USBIN Pin Current (Note 7) .................................700mA CHRG 5 6 ENABLE BAT Pin Current (Note 7) ............................................1A DD PACKAGE BAT Short-Circuit Duration ............................Continuous 10-LEAD (3mm 3mm) PLASTIC DFN T = 125C, = 40C/W (NOTE 3) JMAX JA Maximum Junction Temperature ..........................125C EXPOSED PAD IS GND (PIN 11) MUST BE SOLDERED TO PCB Operating Temperature Range (Note 2) .. 40C to 85C Storage Temperature Range .................. 65C to 125C ORDER PART NUMBER DD PART MARKING LTC4075EDD LBSC LTC4075XEDD LBRK Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: