LTC4085 USB Power Manager with Ideal Diode Controller and Li-Ion Charger FEATURES DESCRIPTION n Seamless Transition Between Input Power Sources: The LTC 4085 is a USB power manager and Li-Ion battery Li-Ion Battery, USB and 5V Wall Adapter charger designed for portable battery-powered applica- n 215m Internal Ideal Diode Plus Optional External tions. The part controls the total current used by the USB Ideal Diode Controller Provide Low Loss PowerPath peripheral for operation and battery charging. The total When Wall Adapter/USB Input Not Present input current can be limited to 20% or 100% of a pro- n Load Dependent Charging Guarantees Accurate USB grammed value up to 1.5A (typically 100mA or 500mA). Input Current Compliance Battery charge current is automatically reduced such that n Constant-Current/Constant-Voltage Operation with the sum of the load current and charge current does not Thermal Feedback to Maximize Charging Rate Without exceed the programmed input current limit. Risk of Overheating* The LTC4085 includes a complete constant-current/ n Selectable 100% or 20% Input Current Limit constant-voltage linear charger for single cell Li-ion bat- (e.g., 500mA/100mA) teries. The float voltage applied to the battery is held to a n Battery Charge Current Independently Programmable tight 0.8% tolerance, and charge current is programmable Up to 1.2A using an external resistor to ground. An end-of-charge n Preset 4.2V Charge Voltage with 0.8% Accuracy status output CHRG indicates full charge. Total charge n C/10 Charge Current Detection Output time is programmable by an external capacitor to ground. n NTC Thermistor Input for Temperature Qualified Charging When the battery drops 100mV below the float voltage, n Tiny (4mm 3mm 0.75mm) 14-Lead DFN Package automatic recharging of the battery occurs. Also featured is an NTC thermistor input used to monitor battery tem- APPLICATIONS perature while charging. n Portable USB Devices: Cameras, MP3 Players, PDAs The LTC4085 is available in a 14-lead low profile 4mm 3mm DFN package. L, 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. TYPICAL APPLICATION Input and Battery Current vs Load Current I LOAD R = 100k, R = 2k PROG CLPROG 5V WALL TO LDOs, ADAPTER REGs, ETC INPUT 600 4.7F I IN 5V (NOM) I IN FROM USB 500 IN WALL CABLE V 510 BUS 1k 4.7F SUSPEND USB POWER SUSP ACPR 400 I LOAD 100mA 500mA SELECT HPWR OUT 300 LTC4085 PROG GATE * I BAT 200 BAT (CHARGING) CLPROG 100 NTC CHRG I V GND TIMER BAT NTC 0 I BAT + 10k WALL = 0V (DISCHARGING) 100 400 600 0 100 200 300 500 * OPTIONAL - TO LOWER I (mA) LOAD 0.1F IDEAL DIODE IMPEDANCE 100k 2k 10k 4085 TA01b 4085 TA01 4085fd 1 CURRENT (mA)LTC4085 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 CLPROG 3 12 PROG Steady State ............................................ 0.3V to 6V HPWR 4 11 CHRG 15 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 WALL 7 8 NTC Pin Current (Steady State) IN, OUT, BAT (Note 6) ..............................................2.5A DE PACKAGE 14-LEAD (4mm s 3mm) PLASTIC DFN Operating Temperature Range .................40C to 85C T = 125C, = 40C/W JMAX JA Maximum Operating Junction Temperature ...........110C EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB Storage Temperature Range .................. 65C to 125C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4085EDE PBF LTC4085EDE TRPBF 4085 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: