35VIN & VOUT battery charge controller delivers up to 20A
It provides advanced system monitoring and management functionality, including battery Coulomb counting and health monitoring. While a host microcontroller is required to access the most advanced features of the LTC4015, the use of an I²C port is optional. The main charging features of the product can be adjusted using pin-strap configurations and programming resistors.
The device offers precision ±5% charge current regulation up to 20A, ±0.5% charge voltage regulation and operation over a 4.5V to 35V input voltage range. Applications include portable medical instruments, military equipment, battery backup applications, industrial handhelds, industrial lighting, ruggedised notebooks/tablet computers, and remote powered communication and telemetry systems.
The LTC4015 contains an accurate 14-bit analogue-to-digital converter (ADC) as well as a high precision Coulomb counter. The ADC continuously monitors numerous system parameters, including input voltage, input current, battery voltage, battery current, and reports battery temperature and battery series resistance (BSR) on command. By monitoring these parameters, the LTC4015 can report on the state of health of the battery, as well as its state of charge. All system parameters can be monitored via a 2-wire I²C interface, while programmable and maskable alerts ensure that only the information of interest causes an interrupt.
The LTC4015’s onboard charging profiles are optimised for each of a variety of battery chemistries including Li-Ion/Polymer, LiFePO4, and lead-acid. Configuration pins allow the user to select between several predefined charge algorithms for each battery chemistry, as well as several algorithms whose parameters can be adjusted via I²C. Both charge voltage and charge current can be automatically adjusted based on battery temperature to comply with JEITA guidelines, or custom settings.
The LTC4015 is housed in a 5 x 7 mm QFN package with an exposed metal pad for thermal performance. E- and I-grade devices are guaranteed for operation from -40°C to 125°C. Pricing starts at $5.95 for the E-grade (1000).
Linear Technology; www.linear.com/product/LTC4015
next page; feature list…
Summary of Features: LTC4015
Multichemistry Li-ion/polymer, LiFePO4 lead-acid battery charger with termination
High efficiency synchronous step-down controller charger
14-Bit ADC for monitoring VBAT, IBAT, VIN, IIN, VSYSTEM & die temperature
Battery capacity & health monitor
Precision Coulomb counter
14-bit ADC for monitoring bsr & battery temperature
Wide charging input voltage range: 4.5V to 35V
Wide battery voltage range up to 35V
Advanced maximum power point tracking algorithm
Optional I²C Serial port control
Ship-and-store feature maximizes battery shelf life
Input & output ideal diodes provide low loss PowerPath
Thermally enhanced 38-lead
5mm x 7mm QFN package
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