Datasheet LTC4001-1 (Analog Devices) - 9

LTC4001-1
OPERATION Overvoltage, Chip Overtemperature and Short-Circuit
exceeds approximately 160°C. Battery charging will be
Current Protection
enabled again when temperature drops to approximately 150°C. The LTC4001-1 includes overvoltage, chip overtemperature and several varieties of short-circuit protection. Short-circuit protection is provided in several different ways. First, a hard short on the battery terminals will A comparator turns off both chargers (high rate and cause the charge to enter trickle charge mode, limiting trickle) if battery voltage exceeds the fl oat voltage by ap- charge current to the trickle charge current (typically proximately 5%. This may occur in situations where the 50mA). Second, PWM charging is prevented if the high battery is accidentally disconnected while battery charging rate charge current is programmed far above the 2A is underway. maximum recommended charge current (via the PROG A comparator continuously monitors on-chip temperature pin). Third, an overcurrent comparator monitors the peak and will shut off the battery charger when chip temperature inductor current. 40011fa 9