LTC4085-1 USB Power Manager with Ideal Diode Controller and 4.1V Li-Ion Charger FEATURES DESCRIPTIO Seamless Transition Between Input Power Sources: The LTC 4085-1 is a USB power manager and Li-Ion Li-Ion Battery, USB and 5V Wall Adapter battery charger designed for portable battery-powered 215m Internal Ideal Diode Plus Optional External applications. The part controls the total current used by TM Ideal Diode Controller Provide Low Loss PowerPath the USB peripheral for operation and battery charging. When Wall Adapter/USB Input Not Present The total input current can be limited to 20% or 100% Load Dependent Charging Guarantees Accurate USB of a programmed value up to 1.5A (typically 100mA or Input Current Compliance 500mA). Battery charge current is automatically reduced 4.1V Float Voltage Improves Battery Life Span and such that the sum of the load current and charge current High Temperature Safety Margin does not exceed the programmed input current limit. Constant-Current/Constant-Voltage Operation with The LTC4085-1 includes a complete constant-current/ Thermal Feedback to Maximize Charging Rate Without constant-voltage linear charger for single cell Li-Ion batter- Risk of Overheating* ies. This 4.1V version of the standard LTC4085 is intended Selectable 100% or 20% Input Current Limit for applications which will be operated or stored above (e.g., 500mA/100mA) approximately 60C. Under these conditions, a reduced Battery Charge Current Independently Programmable float voltage will trade-off initial cell capacity for the benefit Up to 1.2A of increased capacity retention over the life of the battery. A Preset 4.1V Charge Voltage with 0.8% Accuracy reduced float voltage also minimizes swelling in prismatic C/10 Charge Current Detection Output and polymer cells, and avoids open CID (pressure fuse) Tiny (4mm 3mm 0.75mm) 14-Lead DFN Package in cylindrical cells. U APPLICATIO S The LTC4085-1 also includes a programmable termina- tion timer, automatic recharging, an end-of-charge status Portable USB Devices: Cameras, MP3 Players, PDAs output and an NTC thermistor. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the The LTC4085-1 is available in a 14-lead low profile 4mm property of their respective owners. Protected by U.S. Patents, including 6522118, 6700364. Other patents pending. 3mm DFN package. TYPICAL APPLICATIO I LOAD Input and Battery Current vs Load Current 5V WALL TO LDOs, ADAPTER R = 100k, R = 2k PROG CLPROG REGs, ETC INPUT 4.7F 600 1k I 510 IN 5V (NOM) I IN FROM USB 500 IN WALL CABLE V BUS SUSPEND USB POWER SUSP ACPR 4.7F 400 I LOAD 100mA 500mA SELECT HPWR OUT 300 LTC4085-1 I PROG GATE BAT 200 * (CHARGING) 100 CLPROG BAT NTC CHRG 0 I BAT GND I WALL = 0V (DISCHARGING) V TIMER BAT NTC 100 + 0 100 200 300 400 500 600 10k I (mA) LOAD * OPTIONAL - TO LOWER 40851 TA01b 0.1F IDEAL DIODE IMPEDANCE 100k 2k 10k 40851 TA01 40851fa 1 CURRENT (mA) U ULTC4085-1 PI CO FIGURATIO ABSOLUTE AXI U RATI GS (Notes 1, 2, 3, 4, 5) Terminal Voltage TOP VIEW IN, OUT IN 1 14 BAT t < 1ms and Duty Cycle < 1% ................... 0.3V to 7V OUT 2 13 GATE Steady State ............................................. 0.3V to 6V CLPROG 3 12 PROG HPWR 4 15 11 CHRG BAT, CHRG, HPWR, SUSP, WALL, ACPR ..... 0.3V to 6V SUSP 5 10 ACPR NTC, TIMER, PROG, CLPROG .......0.3V to (V + 0.3V) CC TIMER 6 9 V NTC Pin Current (Steady State) WALL 7 8 NTC IN, OUT, BAT (Note 6) ..............................................2.5A DE PACKAGE Operating Temperature Range .................40C to 85C 14-LEAD (4mm 3mm) PLASTIC DFN Maximum Operating Junction Temperature ...........110C T = 125C, = 40C/W JMAX JA EXPOSED PAD (PIN 15) IS GND, MUST BE CONNECTED TO PCB Storage Temperature Range .................. 65C to 125C UUW ORDER I FOR ATIO LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4085EDE-1 PBF LTC4085EDE-1 TRPBF 40851 14-Lead (4mm 3mm) Plastic DFN 40C to 85C 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: