LTC4001 UOPERATIOOvervoltage, 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 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 float voltage by charge current to the trickle charge current (typically approximately 5%. This may occur in situations where the 50mA). Second, PWM charging is prevented if the high battery is accidentally disconnected while battery charg- rate charge current is programmed far above the 2A ing 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. 4001f 9
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