Buck battery charger handles multiple chemistries

Features

• Multichemistry Li-Ion/Polymer, LiFePO₄, or Lead- Acid Battery Charger with Termination
• High Efficiency Synchronous Buck Battery Charger
• Digital Telemetry System Monitors V_BAT, I_BAT, R_BAT,NTC Ratio (Battery Temperature), V_IN, I_IN, V_SYSTEM, Die Temperature
• Coulomb Counter and Integrated 14-Bit ADC
• Wide Charging Input Voltage Range: 4.5V to 35V
• Wide Battery Voltage Range: Up to 35V
• Input Undervoltage Charge Current Limit Loop
• Maximum Power Point Tracking
• Optional I²C Serial Port Control
• Input Current Limit Prioritizes System Load Output
• Input and Output Ideal Diodes Provide Low Loss PowerPath™ Operation
• Instant-On Operation with Discharged Battery

Description

The LTC®4015 is a complete synchronous buck controller/ charger with pin selectable, chemistry specific charging and termination algorithms.
The LTC4015 can charge Li-Ion/Polymer, LiFePO₄, or leadacid batteries. Battery charge voltage is pin selectable and I²C adjustable. Input current limit and charge current can be accurately programmed with sense resistors and can be individually adjusted via the I²C serial port. A digital telemetry system monitors all system power parameters.
Safety timer and current termination algorithms are supported for lithium chemistry batteries. The LTC4015 also includes automatic recharge, precharge (Li-Ion) and NTC thermistor protection. The LTC4015’s I²C port allows user customization of charger algorithms, reading of charger status information, configuration of the maskable and programmable alerts, plus use and configuration of the Coulomb counter.
Available in a 38-Lead 5mm × 7mm QFN package.