LTC4088-1/LTC4088-2 High Efficiency Battery Charger/USB Power Manager with Regulated Output Voltage Fea T Descrip T n Switching Regulator Makes Optimal Use of Limited The LTC 4088-1/LTC4088-2 is a high efficiency USB Power Available from USB Port to Charge Battery PowerPath controller and Li-Ion/Polymer battery char- and Power Application ger. It includes a synchronous switching input regulator, n 180m Internal Ideal Diode Plus External Ideal Diode a full-featured battery charger and an ideal diode. De- Controller Seamlessly Provide Low Loss Power Path signed specifically for USB applications, the LTC4088-1/ When Input Power is Limited or Unavailable LTC4088-2s switching regulator automatically limits its n Automatic Charge Current Reduction Maintains 3.6V input current to either 100mA, 500mA or 1A via logic Minimum V control. The LTC4088-1 powers-up with the charger off OUT n Full Featured Li-Ion/Polymer Battery Charger the LTC4088-2 powers-up with the charger on. n V Operating Range: 4.25V to 5.5V (7V Absolute BUS The switching input stage provides power to V where OUT MaximumTransient) power sharing between the application circuit and the n 1.2A Maximum Input Current Limit battery charger is managed. Charge current is automati- n 1.5A Maximum Charge Current with Thermal Limiting cally reduced to maintain a regulated 3.6V V during OUT n Bat-Track Adaptive Output Control low-battery conditions. As the battery is charged, V OUT n Slew Control Reduces Switching EMI tracks V for high efficiency charging. This feature al- BAT n Low Profile (0.75mm) 14-Lead 4mm 3mm DFN Package lows the LTC4088-1/LTC4088-2 to provide more power to the application and eases thermal issues in constrained a T applications. n Media Players An ideal diode ensures that system power is available n Digital Cameras from the battery when the input current limit is reached n GPS or if the USB or wall supply is removed. n PDAs n Smart Phones The LTC4088-1/LTC4088-2 is available in the low profile 14-Lead 4mm 3mm 0.75mm DFN surface mount L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and PowerPath and Bat-Track are tradmearks of Linear Technology Corporation. All other trademarks package. are the property of their respective owners. Protected by U.S. Patents, including 6522118. Typical a T Switching Regulator Efficiency to System Load (P /P ) OUT BUS High Efficiency Battery Charger/USB Power Manager 100 90 3.3H WALL 80 SYSTEM BAT = 4.2V USB V SW V 70 BUS OUT LOAD D0 V 10F OUTS 60 D1 GATE BAT = 3.3V LTC4088-1/LTC4088-2 50 D2 40 CHRG BAT CLPROG PROG C/X GND NTC 10F 30 + 20 8.2 Li-Ion V = 5V BUS 2.94k 499 0.1F I = 0mA 10 BAT 408812 TA01a 10x MODE 0 0.01 0.1 1 I (A) 408812 TA01b OUT 40881fc 1 EFFICIENCY (%) ion pplica ions pplica ion uresLTC4088-1/LTC4088-2 a Te Maxi Mu M r a T p c F T (Note 1) TOP VIEW V (Transient) t < 1ms, Duty Cycle < 1% .. 0.3V to 7V BUS NTC 1 14 D1 V (Static), BAT, CHRG, NTC, D0, BUS CLPROG 2 13 D0 D1, D2 .......................................................... 0.3V to 6V V 3 12 SW OUTS I ....................................................................3mA CLPROG 15 D2 4 11 V BUS I , I ................................................................2mA C/X 5 10 V PROG C/X OUT PROG 6 9 BAT I ......................................................................75mA CHRG CHRG 7 8 GATE I .............................................................................2A OUT I ..............................................................................2A DE PACKAGE SW 14-LEAD (4mm 3mm) PLASTIC DFN I .............................................................................2A BAT T = 125C, = 37C/W JMAX JA Maximum Operating Junction Temperature .......... 125C EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB Operating Temperature Range .................40C to 85C Storage Temperature Range .................. 65C to 125C o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4088EDE-1 PBF LTC4088EDE-1 TRPBF 40881 14-Lead (4mm x 3mm x 0.75mm) Plastic DFN 40C to 85C LTC4088EDE-2 PBF LTC4088EDE-2 TRPBF 40882 14-Lead (4mm x 3mm x 0.75mm) Plastic DFN 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on nonstandard lead based finish parts. For more information on lead free part markings, go to: