STPIC44L02 datasheet(16/21 Pages) STMICROELECTRONICS

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STPIC44L02

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Figure 19 : Open Load ConditionTime

OVER-BATTERY-VOLTAGE SHUTDOWN

The STPIC44L02 monitors the battery voltage to

prevent the power FETs turning on in the event

that the battery voltage is too high. This condition

may occur due to voltage transients resulting from

a loose battery connection. The TPIC44L02 turns

the power FET off when the battery voltage is

above 34V to prevent possible damage to the load

and the FET. GATE(0-3) output goes back to

normal operation after the overvoltage condition

has been corrected. An over-battery-voltage fault

is flagged to the controller through FLT.The

over-battery-voltage fault is not reported in the

serial fault word. When an over voltage condition

occurs, the device reports the battery fault, but

disables fault reporting for open and shorted-load

conditions.

Fault

reporting

for

open

and

shorted-load conditions are re-enabled after the

battery fault condition has been corrected. When

the fault condition is removed before the CS signal

transitates low, the fault condition is not captured

in the serial fault register. The fault flag resets on a

high-to-low transition of CS providing that no other

faults are present in the device. Figure 21

illustrates the operation of the over-battery voltage

detection circuit.

Figure 20 : Under Battery Shutdown

UNDER-BATTERY-VOLTAGE SHUTDOWN

The STPIC44L02 monitors the battery voltage to

prevent the power FETs from being turned on in

the event that the battery voltage is too low. When

the

battery

voltage

below

4.8V,

then

GATE0-GATE3 may not provide sufficient gate

voltage to the power FETs to minimize the

on-resistance that could result in a thermal stress

on the FET. The output goes back to normal

operation after the under voltage condition has

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