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LTC4078XEDD-TRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LTC4078XEDD-TRPBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page LTC4078X 1 4078xf TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Dual Input Li-Ion Battery Charger with Overvoltage Protection The LTC®4078X 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 LTC4078X 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 LTC4078X terminates the charge cycle when the charge current drops below the programmed termination threshold after the final float voltage is reached. Other features include battery present detection, automatic recharge, undervoltage lockout, charge status outputs, and “power present” status outputs to indicate the presence of wall adapter or USB power. The device is offered in a low profile (0.75mm) 3mm × 3mm 10-lead DFN package. ■ 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 ■ Battery Detection Input Disables Charger When No Battery is Present ■ No External MOSFET, Sense Resistor or Blocking Diode Needed ■ Thermal Regulation Maximizes Charge Rate Without Risk of Overheating* ■ Preset Charge Voltage with ±0.6% Accuracy ■ Programmable Charge Current Termination ■ 40µA USB Suspend Current in Shutdown ■ Charge Status Output ■ Automatic Recharge ■ No Trickle Charge ■ 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. High Voltage Dual Input Battery Charger for Li-Ion Battery Pack LTC4078X DCIN USBIN IUSB IDC BAT ITERM BATDET 1.24k 1% 3.9k 2k 1% 2k 1% WALL ADAPTER USB PORT 1 µF 1 µF + 4.2V Li-Ion BATTERY PACK 800mA (WALL) 500mA (USB) 4078X TA01 GND SUPPLY VOLTAGE (V) 2 900 800 700 600 500 400 300 200 100 0 19 345678 20 4078x TA01b RIDC = 1.24k RIUSB = 2k VBAT = 3.5V VBATDET = 0V CHARGE FROM DCIN CHARGE FROM USBIN Charger Current vs Supply Voltage |
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