LTC4085-3/LTC4085-4 USB Power Manager with Ideal Diode Controller and 3.95V Li-Ion Charger FEATURES DESCRIPTION Seamless Transition Between Input Power Sources: The LTC 4085-3/LTC4085-4 is a USB power manager Li-Ion/Polymer Battery, USB and 5V Wall Adapter and Li-Ion/Polymer battery charger designed for portable 215m Internal Ideal Diode Plus Optional External battery-powered applications. The part controls the total Ideal Diode Controller Provide Low Loss PowerPath current used by the USB peripheral for operation and When Wall Adapter/USB Input Not Present battery charging. The total input current can be limited to Load Dependent Charging Guarantees Accurate 20% or 100% of a programmed value up to 1.5A (typically USB Input Current Compliance 100mA or 500mA). Battery charge current is automati- 3.95V Float Voltage Improves Battery Life Span and cally reduced such that the sum of the load current and High Temperature Safety Margin charge current does not exceed the programmed input Constant-Current/Constant-Voltage Operation with current limit. Thermal Feedback to Maximize Charging Rate without The LTC4085-3/LTC4085-4 includes a complete constant- Risk of Overheating* current/constant-voltage linear charger for single cell Li-Ion Selectable 100% or 20% Input Current Limit batteries. These 3.95V versions of the standard LTC4085 (e.g., 500mA/100mA) are intended for applications which have extended battery Battery Charge Current Independently Programmable lifetime requirements or those that require high temperature Up to 1.2A (approximately >60C) operation or storage. Under these Automatic Output Undervoltage Charge Current conditions, a reduced oat voltage will trade-off initial cell Reduction (LTC4085-3) capacity for the bene t of increased capacity retention Tiny (4mm 3mm 0.75mm) 14-Lead DFN Package over the life of the battery. A reduced oat voltage also minimizes swelling in prismatic and polymer cells, and APPLICATIONS avoids open CID (pressure fuse) in cylindrical cells. Portable USB Devices The LTC4085-3/LTC4085-4 also includes a programmable L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and termination timer, automatic recharging, an end-of-charge Bat-Track, PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including status output and an NTC thermistor. 6522118, 6700364. Other patents pending. TYPICAL APPLICATION I LOAD Input and Battery Current vs Load Current 5V WALL TO LDOs, ADAPTER R = 100k, R = 2k PROG CLPROG REGs, ETC INPUT 600 4.7F 1k I 510 IN I 5V (NOM) IN 500 FROM USB IN WALL CABLE V BUS SUSPEND USB POWER SUSP ACPR 400 4.7F I LOAD 100mA 500mA SELECT HPWR OUT 300 LTC4085-3/ I BAT PROG LTC4085-4 GATE 200 * (CHARGING) 100 CLPROG BAT NTC CHRG 0 I BAT WALL = 0V (DISCHARGING) I GND V TIMER BAT NTC 100 0 100 200 300 400 500 600 + 10k I (mA) LOAD 408534 TA01b * OPTIONAL - TO LOWER 0.1F IDEAL DIODE IMPEDANCE 100k 2k 10k 408534 TA01 408534fb 1 CURRENT (mA)LTC4085-3/LTC4085-4 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (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 BAT, CHRG, HPWR, SUSP, WALL, ACPR....... 0.3V to 6V HPWR 4 15 11 CHRG 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, = 43C/W JMAX JA EXPOSED PAD (PIN 15) IS GND, MUST BE CONNECTED TO PCB Storage Temperature Range ................... 65C to 125C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4085EDE-3 PBF LTC4085EDE-3 TRPBF 40853 40C to 85C 14-Lead (4mm 3mm) Plastic DFN LTC4085EDE-4 PBF LTC4085EDE-4 TRPBF 40854 14-Lead (4mm 3mm) Plastic DFN 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based nish parts. For more information on lead free part marking, go to: