LTC4001_15 datasheet(9/20 Pages) LINER

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LTC4001

4001f

OPERATIO

Overvoltage, Chip Overtemperature and Short-Circuit

Current Protection

The LTC4001 includes overvoltage, chip overtemperature

and several varieties of short-circuit protection.

A comparator turns off both chargers (high rate and

trickle) if battery voltage exceeds the float voltage by

approximately 5%. This may occur in situations where the

battery is accidentally disconnected while battery charg-

ing is underway.

A comparator continuously monitors on-chip temperature

and will shut off the battery charger when chip temperature

exceeds approximately 160

°C. Battery charging will be

enabled again when temperature drops to approximately

150

°C.

Short-circuit protection is provided in several different

ways. First, a hard short on the battery terminals will

cause the charge to enter trickle charge mode, limiting

charge current to the trickle charge current (typically

50mA). Second, PWM charging is prevented if the high

rate charge current is programmed far above the 2A

maximum recommended charge current (via the PROG

pin). Third, an overcurrent comparator monitors the peak

inductor current.

LTC4001 Datasheet(PDF) 9 Page - Linear Technology