DatasheetsPDF.com

LTC4085-1 Dataheets PDF



Part Number LTC4085-1
Manufacturers Linear Technology
Logo Linear Technology
Description USB Power Manager
Datasheet LTC4085-1 DatasheetLTC4085-1 Datasheet (PDF)

U U LTC4085-1 FEATURES USB Power Manager with Ideal Diode Controller and 4.1V Li-Ion Charger DESCRIPTIO ■ Seamless Transition Between Input Power Sources: Li-Ion Battery, USB and 5V Wall Adapter ■ 215mΩ Internal Ideal Diode Plus Optional External Ideal Diode Controller Provide Low Loss PowerPathTM When Wall Adapter/USB Input Not Present ■ Load Dependent Charging Guarantees Accurate USB Input Current Compliance ■ 4.1V Float Voltage Improves Battery Life Span and High Temperature Safety Margin.

  LTC4085-1   LTC4085-1


Document
U U LTC4085-1 FEATURES USB Power Manager with Ideal Diode Controller and 4.1V Li-Ion Charger DESCRIPTIO ■ Seamless Transition Between Input Power Sources: Li-Ion Battery, USB and 5V Wall Adapter ■ 215mΩ Internal Ideal Diode Plus Optional External Ideal Diode Controller Provide Low Loss PowerPathTM When Wall Adapter/USB Input Not Present ■ Load Dependent Charging Guarantees Accurate USB Input Current Compliance ■ 4.1V Float Voltage Improves Battery Life Span and High Temperature Safety Margin ■ Constant-Current/Constant-Voltage Operation with Thermal Feedback to Maximize Charging Rate Without Risk of Overheating* ■ Selectable 100% or 20% Input Current Limit (e.g., 500mA/100mA) ■ Battery Charge Current Independently Programmable Up to 1.2A ■ Preset 4.1V Charge Voltage with 0.8% Accuracy ■ C/10 Charge Current Detection Output ■ Tiny (4mm × 3mm × 0.75mm) 14-Lead DFN Package U APPLICATIO S ■ Portable USB Devices: Cameras, MP3 Players, PDAs , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6522118, 6700364. Other patents pending. The LTC®4085-1 is a USB power manager and Li-Ion battery charger designed for portable battery-powered applications. The part controls the total current used by the USB peripheral for operation and battery charging. The total input current can be limited to 20% or 100% of a programmed value up to 1.5A (typically 100mA or 500mA). Battery charge current is automatically reduced such that the sum of the load current and charge current does not exceed the programmed input current limit. The LTC4085-1 includes a complete constant-current/ constant-voltage linear charger for single cell Li-Ion batteries. This 4.1V version of the standard LTC4085 is intended for applications which will be operated or stored above approximately 60°C. Under these conditions, a reduced float voltage will trade-off initial cell capacity for the benefit of increased capacity retention over the life of the battery. A reduced float voltage also minimizes swelling in prismatic and polymer cells, and avoids open CID (pressure fuse) in cylindrical cells. The LTC4085-1 also includes a programmable termination timer, automatic recharging, an end-of-charge status output and an NTC thermistor. The LTC4085-1 is available in a 14-lead low profile 4mm × 3mm DFN package. TYPICAL APPLICATIO 5V WALL ADAPTER INPUT 5V (NOM) FROM USB CABLE VBUS IIN 4.7μF SUSPEND USB POWER 100mA 500mA SELECT IN SUSP HPWR WALL ACPR OUT PROG LTC4085-1 GATE CLPROG BAT NTC CHRG VNTC 10k GND TIMER 100k 2k 10k ILOAD TO LDOs, REGs, ETC 1k 4.7μF 510Ω * + 0.1μF IBAT * OPTIONAL - TO LOWER IDEAL DIODE IMPEDANCE 40851 TA01 Input and Battery Current vs Load Current RPROG = 100k, RCLPROG = 2k 600 IIN 500 CURRENT (mA) 400 ILOAD 300 200 IBAT (CHARGING) 100 0 IBAT WALL = 0V (DISCHARGING) –100 0 100 200 300 400 500 600 ILOAD (mA) 40851 TA01b 40851fa 1 LTC4085-1 U UU U WW W ABSOLUTE AXI U RATI GS (Notes 1, 2, 3, 4, 5) Terminal Voltage IN, OUT t < 1ms and Duty Cycle < 1%................... –0.3V to 7V Steady State............................................. –0.3V to 6V BAT, CHRG, HPWR, SUSP, WALL, ACPR ..... –0.3V to 6V NTC, TIMER, PROG, CLPROG .......–0.3V to (VCC + 0.3V) Pin Current (Steady State) IN, OUT, BAT (Note 6) ..............................................2.5A Operating Temperature Range .................–40°C to 85°C Maximum Operating Junction Temperature ...........110°C Storage Temperature Range .................. –65°C to 125°C PI CO FIGURATIO TOP VIEW IN 1 OUT 2 CLPROG 3 HPWR 4 SUSP 5 TIMER 6 WALL 7 14 BAT 13 GATE 12 PROG 15 11 CHRG 10 ACPR 9 VNTC 8 NTC DE PACKAGE 14-LEAD (4mm × 3mm) PLASTIC DFN TJMAX = 125°C, θJA = 40°C/W EXPOSED PAD (PIN 15) IS GND, MUST BE CONNECTED TO PCB UW U ORDER I FOR ATIO LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION LTC4085EDE-1#PBF LTC4085EDE-1#TRPBF 40851 14-Lead (4mm × 3mm) Plastic DFN Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ TEMPERATURE RANGE –40°C to 85°C ELECTRICAL CHARACTERISTICS The ● indicates specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VBAT = 3.7V, HPWR = 5V, WALL = 0V, RPROG = 100k, RCLPROG = 2k, unless otherwise noted. SYMBOL VIN VBAT IIN IOUT IBAT VUVLO ΔVUVLO Current Limit ILIM IIN(MAX) RON PARAMETER CONDITIONS MIN TYP MAX Input Supply Voltage IN and OUT 4.35 5.5 Input Voltage BAT 4.3 Input.


LTC4085 LTC4085-1 LTC4088


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)