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LTC4230

4230f

µA PULL-UP

LOAD CURRENT > 150mV/RSENSEn

4230 F08

CHECK FOR FILTER LOW (< VREF)

CHECK FOR FAULT HIGH (> VREF + 50mV)

CHECK FOR GATE

n < 0.25V

FAST COMPARATOR

ARMED

SLOW COMPARATOR

ARMED

CIRCUIT BREAKER TRIPS,

ALL GATE

n PINS PULL

LOW IMMEDIATELY

TIMER

FAULT

GATE

VOUTn

IOUTn

FILTER

1.6

µA PULL-DOWN

CHECK FOR TIMER < 0.3V

LOAD CURRENT < 50mV/RSENSEn

Figure 8. Output Short Circuit Causes Fast Comparator to Trip the Circuit Breaker

APPLICATIO S I FOR ATIO

RESETTING THE ELECTRONIC CIRCUIT BREAKER

Once the LTC4230’s circuit breaker is tripped, FAULT is

asserted low and the GATE

n pin is pulled to ground. The

LTC4230 remains latched OFF in this fault state until the

external fault is cleared. To clear the internal fault detect

circuitry and to restart the LTC4230, its ON pin must be

driven low (VON < 1.234V) for at least 30µs, after which

time FAULT goes high. Toggling the ON pin from low to

high (VON > 1.314V) initiates a restart sequence in the

LTC4230. The timing diagram in Figure 10 illustrates a

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