description
The LTC4000 is a high voltage, high performance controller that converts many externally compensated DC/DC power supplies into a full-featured battery charger.
The LTC4000's battery charger features include: accurate (±0.25%) programmable floating voltage, optional timer or current charge termination, NTC thermistor for proper temperature charging, automatic recharge, for deep discharge C/10 trickle charge, dead battery detection, and status indicator output for the battery. In addition, the battery charger has precise current sensing capability to provide a low detection voltage for high current applications.
The LTC4000 supports intelligent PowerPath control. An external PFET is used to provide low loss reverse current protection. Another external PFET is responsible for providing low-loss charging or discharging of the battery. This second PFET also facilitates an “on-the-fly†feature that provides immediate downstream system power even when connected to a battery that is severely discharged or short-circuited.
The LTC4000 is available in a low profile 28-pin 4mm x 5mm QFN package and SSOP package.
Characteristics
Complete high performance battery charger wide input and output voltage range when used with a DC/DC converter: 3V to 60V
Input ideal diode for low loss reverse isolation and load sharing output Ideal diode for low loss PowerPathTM control and load sharing with battery for "on-the-fly" operation programmable input with severely discharged battery And charge current: ±1% Accuracy with ±0.25% programmable floating voltage programmable C/x or timer-based charge termination for NTC input for temperature charging
28-pin 4mm x 5mm QFN package or SSOP package
application
High-power battery charger system high-performance portable instrument battery-equipped industrial equipment laptop / small laptop
LTC4000 application circuit
See the PDF document for details!
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