LTC4162-S 35V/3.2A Lead-Acid Step-Down Battery Charger with PowerPath and I2C Telemetry FEATURESDESCRIPTION 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 VBAT, between input sources such as wall adapters, backplanes, IBAT, RBAT, TBAT, TDIE, VIN, IIN, VOUT solar panels, etc., and a lead-acid battery. 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 back over the I2C port. The I2C 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 Pin Compatible with Li-Ion and LiFePO The LTC4162-S can charge 6V, 12V, 18V and 24V lead- 4 Versions 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 n instantly under very low battery voltage conditions. 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 APPLICATION9V to 35V, 3.2A Step-Down Switching Battery Charger with PowerPathCharging Current vs Battery Voltage VIN VOUT 3.6 VIN = 18V, 12V BATTERY 3.2 VIN INFET CLP CLN VOUT BATFET 2.8 I2C 2.4 SW CSP 2.0 LTC4162-S 1.6 CSN 1.2 CELL BATSENS+ CHARGE CURRENT (A) COUNT 0.8 NTCBIAS CC–CV NTC 0.4 ABSORB EQUALIZE GND T 0.06.0 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 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram ESD Diagram Timing Diagram Operation Applications Information Register Descriptions Typical Applications Package Description Revision History Typical Application Related Parts
