ACT4910QW
Rev 1.0, 15-Sept-2017
SHUTDOWN2 State
current operating state can be determined by reading
the I2C register bits CURRENT_STATE in register
0x00h.
SHUTDOWN2 disables all IC functionality to protect
against extreme over temperature conditions above
155°C. This includes shutting off the eFuse. I2C
functionality not available in this state. The IC transitions
to SOFT-START when the junction temperature drops
and there is no overcurrent fault. Figure 3 shows the
ACT4910 State Diagram. Table 1 shows which
functions are enabled in each state. Note that the
UV/POR
EN UV
Storage cap < 3.6V
Buck output UV/OV
Bu ck OC
EN > UV
& VIN > UVLO
LDO UV
Compensation pin shot to GND
Optional
Timer
125ms
eFuse not in OC
& TJ < 155°C
& 100ms delay
Shutdown2
Soft‐
Start
Supplement
Mode
eFuse
eFuse over current
TJ > 155°C
Mode
eFuse over current
TJ > 155°C
VIN ‐ VOUT < 200mV
Soft‐start done
EN UV/OV
VIN OV
TJ > 155°C
& go to Shutdown2
when TJ > 155°C
eFuse OC
VIN ‐ VOUT > 560mV
TJ < 135° C
& LDO not UV
& Storage cap not OV
Health
Check
Mode
Repeat every 4min
Normal
Mode
Storage Cap
is Filled to
PG_THR
& Boot cap not fail
Shutdown1
Boost
TJ > 135° C
LDO UV
Storage cap OV
Boot cap fail
Figure 3: State Machine Diagram
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