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MAX8536 Evaluation Kit
Reverse Current
The IC controller detects reverse current during normal
operation by monitoring the voltage difference between
PS_OUT+ and VBUS+ using the on-resistance
(R DS(ON) ) of both N-channel MOSFETs, N1 and N2. N1
and N2 have a combined on-resistance of 7m Ω (typ).
The IC controller detects a reverse-current fault condi-
tion when VBUS+ voltage minus PS_OUT+ voltage is
greater than 0.03V (typ), after a 500ms blanking period
when the gate drive first turns on. The EV kit detects a
reverse-current fault condition if 4.3A (typ) (4.3A x 7m Ω
> 0.03V) are sourced from V BUS+ to PS_OUT+. During
a reverse-current condition, the IC controller turns off
the MOSFETs, asserts a logic low on the FAULT output,
and latches off.
F A U L T Conditions
The FAULT PCB pad is connected to the IC’s FAULT
pin. The FAULT pin is pulled to VBUS+ by R2 during
normal operation. During an overvoltage, undervoltage,
or reverse-current fault condition, the IC enters the fault-
condition state where the FAULT pin is pulled low and
the GATE pin is discharged to ground. This turns off
both MOSFETs. The fault condition does not latch dur-
ing an undervoltage condition. The IC latches off during
a reverse-current or overvoltage fault condition. Cycle
the input power supply or enter shutdown mode using
JU1 to clear the latch (see Table 2 for the fault states’
descriptions).
Capacitors C4 and C5
Install ceramic capacitors on C4 and C5 to filter input
and output bus noise. Select a ceramic capacitor with a
value between 1μF and 4.7μF in a 0805 case size with
a voltage rating of 6.3V (min).
Table 2. MAX8356 Fault States
FAULT STATE
Undervoltage Lockout
Undervoltage Protection
Overvoltage Protection
Reverse-Current Protection
CONDITIONS
PS_OUT+ < 2.7V (typ)
PS_OUT+ < 2.9V
VBUS+ > 5.75V and PS_OUT+ > (VBUS+) + 0.01V
PS_OUT+ < (VBUS+) - 0.03V and MOSFETs ON for
t > 0.5s
MOSFETs
Off
Off
Off
Off
FAULT
OUTPUT
VBUS+
Low
Low
Low
LATCHING
No
No
Yes
Yes
4
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