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LTC4075HVX Datasheet(PDF) 1 Page - Linear Technology |
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LTC4075HVX Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LTC4075HVX 1 4075hvxf TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION High Voltage Dual Input Li-Ion/Polymer Battery Charger The LTC®4075HVX is a standalone linear charger that is capable of charging a single-cell Li-Ion/Polymer battery from both wall adapter and USB inputs. The charger can detect power at the inputs and automatically select the appropriate power source for charging. No external sense resistor or blocking diode is required for charging due to the internal MOSFET architecture. The LTC4075HVX features a maximum 22V rating for both wall adapter and USB inputs although charging stops if the selected power source exceeds the overvoltage limit. Internal thermal feedback regulates the battery charge current to maintain a constant die temperature during high power operation or high ambient temperature conditions. The float voltage is fixed at 4.2V and the charge current is programmed with an external resistor. The LTC4075HVX terminates the charge cycle when the charge current drops below the programmed termination threshold after the final float voltage is reached. Other features include automatic recharge, undervoltage lockout, charge status outputs, and “power present” status outputs to indicate the presence of wall adapter or USB power. No trickle charge allows full current from the charger when a load is connected directly to the battery. ■ 22V Maximum Voltage for Wall Adapter and USB Inputs ■ Charge Single-Cell Li-Ion Batteries from Wall Adapter and USB Inputs ■ Automatic Input Power Detection and Selection ■ Charge Current Programmable up to 950mA from Wall Adapter Input ■ Overvoltage Lockout for Wall Adapter and USB Inputs ■ No External MOSFET, Sense Resistor or Blocking Diode Needed ■ Thermal Regulation Maximizes Charge Rate Without Risk of Overheating* ■ Preset Charge Voltage with ±0.35% Accuracy ■ Programmable Charge Current Termination ■ 40μA USB Suspend Current in Shutdown ■ Independent “Power Present” Status Outputs ■ Charge Status Output ■ Automatic Recharge ■ Available in a Thermally Enhanced, Low Profile (0.75mm) 10-Lead (3mm × 3mm) DFN Package ■ Cellular Telephones ■ Handheld Computers ■ Portable MP3 Players ■ Digital Cameras , 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 including 6522118, 6700364. Dual Input Battery Charger for Single-Cell Li-Ion LTC4075HVX DCIN USBIN IUSB IDC BAT ITERM 1.24k 1% 2k 1% 2k 1% WALL ADAPTER USB PORT 1 μF 1 μF + 4.2V SINGLE CELL Li-Ion BATTERY 800mA (WALL) 500mA (USB) 4075hvx TA01 GND SUPPLY VOLTAGE (V) 2 900 800 700 600 500 400 300 200 100 0 19 345678 20 4075hvx TA01b RIDC = 1.24k RIUSB = 2k VBAT = 3.5V CHARGE FROM DCIN CHARGE FROM USBIN Charge Current vs Supply Voltage |
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