LTC4162-S 35V/3.2A Lead-Acid Step-Down Battery Charger with 2 PowerPath and I C Telemetry FEATURES DESCRIPTION n Lead-Acid Battery Charger with Absorb and Equalize The LTC 4162-S is an advanced monolithic synchronous n Wide Charging Input Voltage Range: 4.5V to 35V step-down switching battery charger and PowerPath n High Efficiency Synchronous Operation manager that seamlessly manages power distribution n 16-Bit Digital Telemetry System Monitors V , between input sources such as wall adapters, backplanes, BAT I , R , T , T , V , I , V solar panels, etc., and a lead-acid battery. BAT BAT BAT DIE IN IN OUT n Charges 6V, 12V, 18V and 24V Lead-Acid Batteries A high resolution measurement system provides exten- n Input Undervoltage Charge Current Limit Loop sive telemetry information for circuit voltages, currents, n Input MPPT for Solar Panel Inputs battery resistance and temperature which can all be read n Input Current Limit Prioritizes System Load Output 2 2 back over the I C port. The I C port can also be used to n Low Loss PowerPath configure many charging parameters including charging n Instant-On Operation with Discharged or Missing voltages and currents, termination algorithms and numer- Battery ous system status alerts. n Temperature Controlled Charging n The LTC4162-S can charge 6V, 12V, 18V and 24V lead- Pin Compatible with Li-Ion and LiFePO Versions 4 acid batteries with as much as 3.2A of charge current. The power path topology decouples the output voltage APPLICATIONS from the battery allowing a portable product to start up instantly under very low battery voltage conditions. n Medical Instruments n USB-C Power Delivery The LTC4162-S is available in a thermally enhanced 28- n Industrial Handhelds pin 4mm 5mm 0.75mm QFN surface mount package. n Ruggedized Notebook All registered trademarks and trademarks are the property of their respective owners. n Tablet Computers TYPICAL APPLICATION 9V to 35V, 3.2A Step-Down Switching Battery Charger with PowerPath Charging Current vs Battery Voltage V V IN OUT 3.6 V = 18V, 12V BATTERY IN 3.2 V INFET CLP CLN V IN OUT 2.8 BATFET 2 I C 2.4 SW 2.0 CSP 1.6 LTC4162-S CSN 1.2 + BATSENS CELL 0.8 COUNT NTCBIAS CCCV ABSORB NTC 0.4 EQUALIZE 0.0 T GND 6.0 7.2 8.4 9.6 10.8 12.0 13.2 14.4 15.6 16.8 BATTERY VOLTAGE (V) 4162S TA01a 4162S TA01b Rev B 1 Document Feedback For more information www.analog.com CHARGE CURRENT (A)LTC4162-S TABLE OF CONTENTS 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 .......................................................................................... 7 Pin Functions .....................................................................................................................10 Block Diagram ....................................................................................................................12 ESD Diagram .....................................................................................................................13 Timing Diagram ..................................................................................................................14 Operation..........................................................................................................................15 Applications Information .......................................................................................................27 Register Descriptions ...........................................................................................................34 Typical Applications .............................................................................................................44 Package Description ............................................................................................................46 Revision History .................................................................................................................47 Typical Application ..............................................................................................................48 Related Parts .....................................................................................................................48 Rev B 2 For more information www.analog.com