ACT4910QW
Rev 1.0, 15-Sept-2017
settings. See the Storage Boost Converter section for
more information.
operation. The IC exits softstart ~10ms after the
programmed softstart time ends.
PLI_VOUT_READY function. Set PLI_FUNC_SEL = 11
to configure PLI for this function. With this setting, PLI
ISET
ISET sets the eFuse current limit with a resistor
connected to VSS. See the eFuse section for more
information.
performs
a dual function. It starts out as the
VOUT_READY function at turn-on. After PLI goes from
low to high after softstart, it then acts as the Power Loss
Indicator function.
SS
The SS pin uses a capacitor to VSS to control the eFuse
softstart timing. See the eFuse section for more
information.
The PLI pin is an open-drain output and is 24V
compliant.
FB
PGND
The FB pin is used to regulate the buck converter output
voltage when the IC is in supplement mode.
The PGND pin is the buck and boost converters’ power
ground. The internal FETs connect directly to the PGND
pins. The power supply input and output capacitors
should connect to the PGND pins.
HSB
HSB provides power to the internal high-side MOSFET
gate driver circuitry. Connect a 47nF capacitor from
HSB pin to SW pin.
COMP
COMP is the output of a transconductance amplifier that
is used to compensate the internal buck converter. The
compensation components, which are typically a
standard type-2 compensation should be grounded to
the VSS pin. See the Application section for more
information on compensating the internal buck
converter.
SW
SW is the switch node for the internal buck and boost
converters.
VOUT
VOUT is the output of the eFuse and connects to the
system load. VOUT powers the boost converter when
it charges up the storage capacitors. It is the output of
the buck converter when the IC is in supplement
mode. The eFuse connects VOUT to VIN in normal
operation, and it disconnects it in supplement mode.
PLI
The PLI pin has four possible functions which are set by
the internal I2C registers.
Power Loss Indicator function. Set register bits
PLI_FUNC_SEL[1:0] in 0x19h to 00 to configure PLI for
this function. With this setting, PLI goes high after
softstart and stays high in normal operation. PLI
immediately goes low when the IC enters supplement
mode. This setting is used to let the system uP know
that power loss is imminent.
PG_STR function. Set PLI_FUNC_SEL = 01 to
configure PLI for this function. With this setting, PLI
starts low during softstart and then goes high when the
storage capacitor voltage is in regulation. It goes low if
the storage voltage drops below 95% of its programmed
output voltage.
VOUT_READY function. Set PLI_FUNC_SEL = 10 to
configure PLI for this function. With this setting, PLI
starts low during softstart and then goes high when the
IC exits the softstart mode and goes into normal
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