LTC4088 High Efficiency Battery Charger/USB Power Manager Fea T Descrip T n Switching Regulator Makes Optimal Use of Limited The LTC 4088 is a high efficiency USB PowerPath Power Available from USB Port to Charge Battery controller and Li-Ion/Polymer battery charger. It includes and Power Application a synchronous switching input regulator, a full-featured n 180m Internal Ideal Diode Plus Optional External battery charger and an ideal diode. Designed specifically Ideal Diode Controller Seamlessly Provides Low for USB applications, the LTC4088s switching regulator Loss Power Path When Input Power is Limited or automatically limits its input current to either 100mA, Unavailable 500mA or 1A for wall-powered applications via logic n Full Featured Li-Ion/Polymer Battery Charger control. 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. Unlike linear PowerPath n 1.5A Maximum Charge Current with Thermal Limiting controllers, the LTC4088s switching input stage can use n Bat-Track Adaptive Output Control nearly all of the 0.5W or 2.5W available from the USB port n Slew Control Reduces Switching EMI with minimal power dissipation. This feature allows the n Low Profile (0.75mm) 14-Lead 4mm 3mm DFN LTC4088 to provide more power to the application and Package eases thermal issues in space-constrained applications. An ideal diode ensures that system power is available a T from the battery when the input current limit is reached n or if the USB or wall supply is removed. Media Players n Digital Cameras The LTC4088 is available in the low profile 14-lead 4mm n GPS 3mm 0.75mm DFN surface mount package. n PDAs L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n PowerPath, Bat-Track and ThinSOT are trademarks of Linear Technology Corporation. All other Smart Phones trademarks 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 ) High Efficiency Battery Charger/USB Power Manager OUT BUS 100 WALL 3.3H 90 80 SYSTEM USB V SW V BAT = 4.2V BUS OUT 70 LOAD D0 10F 60 D1 GATE BAT = 3.3V 50 D2 LTC4088 BAT CHRG 40 10F 3.3V LDO3V3 30 CLPROG PROG C/X GND NTC 20 V = 5V BUS 1F + I = 0mA 10 BAT 8.2 Li-Ion 10x MODE 2.94k 499 0.1F 0 4088 TA01a 0.01 0.1 1 I (A) OUT 4088 TA01b 4088fb 1 EFFICIENCY (%) ion pplica ions pplica ion uresLTC4088 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 LDO3V3 3 12 SW 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 ...................................................................30mA LDO3V3 CHRG 7 8 GATE I ......................................................................75mA CHRG I ............................................................................2A DE PACKAGE OUT 14-LEAD (4mm 3mm) PLASTIC DFN I ..............................................................................2A SW T = 125C, = 37C/W JMAX JA IBAT ............................................................................2A EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB Maximum Operating Junction Temperature .......... 125C 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 PBF LTC4088EDE TRPBF 4088 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 nonstandard lead based finish parts. For more information on lead free part marking, go to: