New from Linear Technology is the LTC4000-1, a high-voltage controller and power manager with input maximum power point control (MPPC) that converts virtually any externally compensated DC/DC power supply into a full-featured battery charger.
The IC is capable of driving typical DC/DC converter topologies, including buck, boost, buck-boost, SEPIC, flyback and forward. It offers precision input current monitoring and charge current monitoring and regulation. It operates across a wide 3 V to 60 V input and output voltage range, compatible with a variety of different input voltage sources, battery stacks and chemistries.
The LTC4000-1’s MPPC circuit features an input voltage regulation loop that controls charge current to maintain the input voltage at a programmed level, ideal for solar panels or other high-impedance sources. Applications include high-power battery charger systems, high-performance portable instruments, battery backup systems, and industrial or military battery-equipped devices.
The device features an intelligent PowerPath topology that preferentially provides power to the system load when input power is limited. It controls external PFETs to provide low-loss reverse current protection, efficient charging and discharging of the battery, and instant-on operation to ensure that system power is available at plug-in, even with a deeply discharged battery.
External sense resistors and precision sensing ensure accurate currents at high efficiency, allowing operation with converters that span the power range from milliwatts to kilowatts.
The LTC4000-1’s full-featured controller charges a variety of battery chemistries, including lithium-ion/polymer/phosphate, sealed lead acid (SLA) and nickel-based. The device provides charge status indicators through its FLT and CHRG pins.
Other features of the battery charger include ±0,2% programmable float voltage, selectable timer or C/X current termination, temperature-qualified charging using an NTC thermistor, automatic recharge, C/10 trickle charge for deeply discharged cells and bad battery detection.
The chip is housed in low-profile (0,75 mm) 28-pin 4 x 5 mm QFN and 28-lead SSOP packages, and is guaranteed for operation from -40°C to 125°C.
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