MAX14691 Datasheet, PDF (14/19 Pages) Maxim Integrated Products – High-Accuracy, Adjustable Power Limiter

MAX14691–MAX14693
High-Accuracy, Adjustable Power Limiter
Latchoff Mode (Figure 4)
In latchoff current-limit mode, when current through the
device reaches the threshold, the t_BLANK timer begins
counting. FLAG asserts when the voltage drop across the
switch rises above V_FA. The timer resets if the overcur-
rent condition disappears before t_BLANK has elapsed. The
switch turns off if the overcurrent condition remains for the
blanking time. The switch remains off until the control logic
(EN or HVEN) is toggled or the input voltage is cycled.
Continuous Mode (Figure 5)
In continuous current-limit mode, when current through
the device reaches the threshold, the device limits the
current to the programmed limit. FLAG asserts when
the voltage drop across the switch rises above V_FA, and
deasserts when it falls below V_FA.
Fault Indicator (FLAG) Output
FLAG is an open-drain fault-indicator output. It requires
an external pullup resistor to a DC supply. FLAG asserts
when any of the following conditions occur:
●● V_IN - V_OUT > V_FA
●● Reverse-current protection is tripped
●● Die temperature exceeds +165ºC
●● SETI is connected to ground
●● UVLO threshold has not been reached
●● OVLO threshold is reached
tDEB
tSTI
tSTO
tSTI
OVLO
IN ^UVLO
IOUT ^ILIMIT
1x /1.5x /2x ILIMIT
THERMAL CURRENT LIMIT
1x /1.5x /2x ILIMIT
VIN
VFA
VOUT _{VOUT_UVLO}
TJMAX
TJ
HVEN
EN
FLAG
NOT DRAWN TO SCALE
Figure 5. Continuous Fault Diagram
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THERMAL CURRENT
LIMIT
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