LTC3554/LTC3554-1/ LTC3554-2/LTC3554-3 Micropower USB Power Manager with Li-Ion Charger and Two Step-Down Regulators Fea T Descrip T n 10A Standby Mode Quiescent Current (All Outputs On) The LTC 3554 family* are micropower, highly integrated n Seamless Transition Between Input Power Sources: power management and battery charger ICs for single-cell Li-Ion/Polymer Battery and USB Li-Ion/Polymer battery applications. They include a n 240m Internal Ideal Diode PowerPath manager with automatic load prioritization, n Dual High Efficiency Step-Down Switching Regulators a battery charger, an ideal diode and numerous internal (200mA I ) with Adjustable Output Voltages protection features. Designed specifically for USB applica- OUT n Pushbutton On/Off Control with System Reset tions, the LTC3554 power managers automatically limit n Reset Time: 5 sec (LTC3554/LTC3554-1), input current to a maximum of either 100mA or 500mA. 14 sec (LTC3554-2/LTC3554-3) Battery charge current is automatically reduced such that n Full Featured Li-Ion/Polymer Battery Charger the sum of the load current and the charge current does n Programmable Charge Current with Thermal Limiting not exceed the selected input current limit. n Instant-On Operation with Discharged Battery The LTC3554 also includes two synchronous step-down n Battery Float Voltage: 4.2V (LTC3554/LTC3554-2/ switching regulators as well as a pushbutton controller. LTC3554-3), 4.1V (LTC3554-1) With all supplies enabled in standby mode, the quiescent n 3mm 3mm 0.75mm 20-Lead QFN Package current drawn from the battery is only 10A. The LTC3554 family are available in a 3mm 3mm 0.75mm 20-lead a T QFN package. n USB-Based Handheld Products L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and PowerPath, Hot Swap and Bat-Track are trademarks of Linear Technology Corporation. n Portable Li-Ion/Polymer Based Electronic Devices All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6522118, 6700364, 5481178, 6304066, 6570372, 6580258, 7511390. n Fitness Computers *See table on page 2 for available options. n Low Power Medical Devices Typical a T 4.35V TO 5.5V SYSTEM V V BUS OUT USB INPUT LOAD 10F 10F 100k Battery Drain Current NTC CHRG LTC3554 vs Temperature PROG BAT 100k T 14 + Li-Ion V = 3.8V BAT 1.87k BATTERY STBY = 3.8V 12 REGULATORS LOAD = 0mA BOTH REGULATORS HPWR BVIN 10 ENABLED 2.2F SUSP 8 4.7H ONE REGULATOR ENABLED 3.3V PWR ON1 SW1 6 200mA 2.05M 10pF 10F BOTH REGULATORS DISABLED 4 FSEL FB1 649k 2 STBY HARD RESET PGOOD 10H 0 1.2V 75 50 25 0 25 50 75 100 125 SW2 PWR ON2 200mA TEMPERATURE (C) 10pF 332k 10F PBSTAT 3554 TA01b FB2 ON 649k 3554 TA01a ON/OFF 3554123ff 1 BATTERY DRAIN CURRENT (A) ion pplica ions pplica ion uresLTC3554/LTC3554-1/ LTC3554-2/LTC3554-3 a Te Maxi Mu M r a T p in c F T (Notes 1, 2, 3) V , V , BVIN TOP VIEW BUS OUT t < 1ms and Duty Cycle < 1% ................... 0.3V to 7V Steady State ............................................ 0.3V to 6V 20 19 18 17 16 NTC HPWR 1 15 BAT, NTC, CHRG, SUSP, PBSTAT, CHRG FSEL 2 14 ON, PGOOD, FB1, FB2 .................................. 0.3V to 6V 21 SW1 PBSTAT 3 13 GND PWR ON1, PWR ON2, STBY BVIN PGOOD 4 12 HPWR, FSEL (Note 4) ......................0.3V to V + 0.3V CC SW2 ON 5 11 I .............................................................................1A 6 7 8 9 10 BAT I , I (Continuous) ...................................... 300mA SW1 SW2 I , I I ............................................75mA CHRG PGOOD, PBSTAT Operating Junction Temperature Range ...40C to 85C UD PACKAGE 20-LEAD (3mm 3mm) PLASTIC QFN Junction Temperature ............................................110C T = 110C, = 58.7C/W JMAX JA EXPOSED PAD (PIN 21) IS GND, AND MUST BE SOLDERED TO PCB GND Storage Temperature Range .................. 65C to 125C o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3554EUD PBF LTC3554EUD TRPBF LDYS 20-Lead (3mm 3mm) Plastic QFN 40C to 85C LTC3554EUD-1 PBF LTC3554EUD-1 TRPBF LGFG 20-Lead (3mm 3mm) Plastic QFN 40C to 85C LTC3554EUD-2 PBF LTC3554EUD-2 TRPBF LFZX 20-Lead (3mm 3mm) Plastic QFN 40C to 85C LTC3554EUD-3 PBF LTC3554EUD-3 TRPBF LGHK 40C to 85C 20-Lead (3mm 3mm) Plastic QFN LTC3554EPD PBF LTC3554EPD TRPBF FDPT 20-Lead (3mm 3mm) Plastic UTQFN 40C to 85C (OBSOLETE) 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: