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LTC4077 Dataheets PDF



Part Number LTC4077
Manufacturers Linear Technology
Logo Linear Technology
Description Dual Input Standalone Li-Ion Battery Charger
Datasheet LTC4077 DatasheetLTC4077 Datasheet (PDF)

U U FEATURES ■ Charges 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 ■ C/10 Charge Current Termination ■ Thermal Regulation Maximizes Charge Rate Without Risk of Overheating* ■ Preset Charge Voltage with ±0.6% Accuracy ■ 18µA USB Suspend Current in Shutdown ■ Power Present Status Output ■ Charge Status Output ■ Automatic Recharge ■ Available in a Thermally Enhanced, .

  LTC4077   LTC4077


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U U FEATURES ■ Charges 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 ■ C/10 Charge Current Termination ■ Thermal Regulation Maximizes Charge Rate Without Risk of Overheating* ■ Preset Charge Voltage with ±0.6% Accuracy ■ 18µA USB Suspend Current in Shutdown ■ Power Present Status Output ■ Charge Status Output ■ Automatic Recharge ■ Available in a Thermally Enhanced, Low Profile (0.75mm) 10-Lead (3mm × 3mm) DFN Package U APPLICATIO S ■ Cellular Telephones ■ Handheld Computers ■ Portable MP3 Players ■ Digital Cameras LTC4077 Dual Input Standalone Li-Ion Battery Charger DESCRIPTIO The LTC®4077 is a standalone linear charger that is capable of charging a single-cell Li-Ion 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. 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 LTC4077 terminates the charge cycle when the charge current drops below the termination threshold after the final float voltage is reached. The LTC4077 can be put into shutdown mode reducing the DCIN supply current to 20µA, the USBIN supply current to 10µA, and the battery drain current to less than 2µA even with power applied to both inputs. Other features include automatic recharge, undervoltage lockout, charge status output, power present status output to indicate the presence of wall adapter or USB power and high power/low power adjustable mode for USB compatible applications. , 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 TYPICAL APPLICATIO Dual Input Battery Charger for Single-Cell Li-Ion WALL ADAPTER USB PORT 1F LTC4077 DCIN BAT USBIN HPWR 1F IUSB 2k IDC IUSBL 1% 1.24k GND 1% 800mA (WALL) 500mA (USB) + 4.2V SINGLE CELL Li-Ion BATTERY 2k 1% 4077 TA01 DCIN BATTERY CHARGE VOLTAGE (V) VOLTAGE (V) CURRENT (mA) Complete Charge Cycle (1100mAh Battery) 1000 800 600 400 200 0 4.2 4.0 3.8 3.6 3.4 5.0 2.5 0 CONSTANT VOLTAGE USBIN = 5V TA = 25°C RIDC = 1.24k RIUSB = 2k HPWR = 5V 0 0.5 1.0 1.5 2.0 2.5 3.0 TIME (HR) 4077fa 1 U WW W LTC4077 ABSOLUTE AXI U RATI GS (Notes 1, 9) Input Supply Voltage (DCIN, USBIN) ......... –0.3V to 10V EN, CHRG, PWR, HPWR ............................ –0.3V to 10V BAT, IDC, IUSB, IUSBL................................. –0.3V to 7V DCIN Pin Current (Note 6) ..........................................1A USBIN Pin Current (Note 6) .................................700mA BAT Pin Current (Note 6) ............................................1A BAT Short-Circuit Duration............................ Continuous Maximum Junction Temperature .......................... 125°C Operating Temperature Range (Note 2) .. –40°C to 85°C Storage Temperature Range.................. –65°C to 125°C UW U PACKAGE/ORDER I FOR ATIO TOP VIEW USBIN 1 IUSB 2 IUSBL 3 PWR 4 CHRG 5 10 DCIN 9 BAT 11 8 IDC 7 HPWR 6 EN DD PACKAGE 10-LEAD (3mm 3mm) PLASTIC DFN TJMAX = 125°C, θJA = 40°C/W (NOTE 3) EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB ORDER PART NUMBER DD PART MARKING LTC4077EDD LBWD Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VDCIN = 5V, VUSBIN = 5V, HPWR = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VDCIN VUSBIN IDCIN IUSBIN VFLOAT IBAT VIDC VIUSB VIUSBL IC/IO Supply Voltage ● 4.3 8 V Supply Voltage ● 4.3 8 V DCIN Supply Current Charge Mode (Note 4), RIDC = 10k Standby Mode; Charge Terminated Shutdown Mode (EN = 5V) ● 150 700 µA ● 50 100 µA 20 40 µA USBIN Supply Current Regulated Output (Float) Voltage BAT Pin Current IDC Pin Regulated Voltage Charge Mode (Note 5), RIUSB = RIUSBL = 10k, VDCIN = 0V ● Standby Mode; Charge Terminated, VDCIN = 0V ● Shutdown (VDCIN = 0V, EN = 5V) VDCIN > VUSBIN 150 700 µA 50 100 µA 18 36 µA 10 20 µA IBAT = 1mA (Note 9) 4.175 4.2 4.225 V IBAT = 1mA, 0°C < TA < 85°C, 4.3V < VCC < 8V 4.158 4.2 4.242 V RIDC = 1.25k, Constant-Current Mode RIUSB =.


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