LTC4156 Dual-Input Power Manager/ 3.5A LiFePO Battery Charger 4 2 with I C Control and USB OTG Fea T Descrip T 2 n High Efficiency Charger Capable of 3.5A The LTC 4156 is a 15 watt I C controlled power manager Charge Current with PowerPath instant-on operation, high efficiency n Charge Control Algorithm Specifically Designed for switching battery charging and USB compatibility. The LiFePO Batteries (Lithium Iron Phosphate) LTC4156 seamlessly manages power distribution from 4 n Monolithic Switching Regulator Makes Optimal Use two 5V sources, such as a USB port and a wall adapter, to of Limited Power and Thermal Budget a single-cell rechargeable lithium iron phosphate battery n Dual Input Overvoltage Protection Controller and a system load. n Priority Multiplexing for Multiple Inputs The LTC4156s switching battery charger automatically 2 n I C/SMBus Control and Status Feedback limits its input current for USB compatibility, or may n NTC Thermistor ADC for Temperature Dependent draw up to 3A from a high power wall adapter. The high Charge Algorithms (JEITA) efficiency step-down switching charger is designed to n Instant-On Operation with Low Battery provide maximum power to the application and reduced n Battery Ideal Diode Controller for Power heat in high power density applications. Management 2 n I C adjustability of input current, charge current, battery USB On-The-Go Power Delivery to the USB Port n float voltage, charge termination, and many other param- Four Float Voltage Settings (3.45V, 3.55V, 3.6V, 3.8V) 2 n eters allows maximum flexibility. I C status reporting of 28-Lead 4mm 5mm QFN Package key system and charge parameters facilitates intelligent control decisions. USB On-The-Go support provides 5V a T power back to the USB port without any additional com- n ponents. A dual-input, priority multiplexing, overvoltage Portable Medical Devices n protection circuit guards the LTC4156 from high voltage Portable Industrial Devices n damage on the V pin. Backup Devices BUS L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and The LTC4156 is available in the low profile (0.75mm) PowerPath and Bat-Track are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 28-lead 4mm 5mm QFN surface mount package. Typical a T Switching Regulator Efficiency 2 100 I C Controlled High Power Battery Charger/USB Power Manager 90 1H TO WALLSNS SW SYSTEM 80 WALLGT LOAD V OUT 70 60 CHGSNS V V IN BUS 50 10F 22F BATGATE LTC4156 40 USBGT BATSNS 3.6k 100k 30 NTCBIAS USBSNS ID NTC 20 3 2 CLPROG2 CLPROG1 PROG V OVGCAP I C IRQ GND C 10 V = 3.3V BAT 0 1.21k 499 47nF 0 0.5 1.0 1.5 2.0 2.5 3.0 LOAD CURRENT (A) 4156 TA01b 4156 TA01a 4156fa 1 EFFICIENCY (%) ion pplica ions pplica ion uresLTC4156 Table o F c T Ts Features ............................................................................................................................ 1 Applications ....................................................................................................................... 1 Typical Application ............................................................................................................... 1 Description......................................................................................................................... 1 Absolute Maximum Ratings ..................................................................................................... 3 Order Information ................................................................................................................. 3 Pin Configuration ................................................................................................................. 3 Electrical Characteristics ........................................................................................................ 4 Typical Performance Characteristics .......................................................................................... 9 Pin Functions .....................................................................................................................12 Block Diagram ....................................................................................................................15 Timing Diagrams ................................................................................................................16 Operation..........................................................................................................................17 2 I C ........................................................................................................................................................................ 17 Applications Information .......................................................................................................40 Typical Applications .............................................................................................................47 Package Description ............................................................................................................50 Revision History .................................................................................................................51 Typical Application ..............................................................................................................52 Related Parts .....................................................................................................................52 4156fa 2 en on