LTM4641
PIN FUNCTIONS
handling the input current to LTM4641’s power stage.
SGND to obtain an output voltage soft-start ramp-up rate
whoseturn-ontimeis0.6mspernanofaradofcapacitance.
Alternatively, when a voltage is applied to TRACK/SS
through a resistor-divider network from another rail, the
LTM4641 output is able to track the external voltage to
satisfycoincidentandratiometricrail-voltagesequencing
requirements. See the Applications Information section.
DonotdecoupletheV pinswithanybypasscapacitance
INH
in this case. Instead, place all decoupling capacitance
directly between the drain of MSP to GND.
If not utilizing the advanced OOV protection features of
the LTM4641, do decouple the V
local ceramic and bulk decoupling capacitance (see the
Applications Information section).
pins to GND with
INH
V
(ꢁ9): Gate Drive Output Pin. If utilizing the advanced
ING
output overvoltage (OOV) protection features of the
PGOOD (L1): Output Voltage Power Good Indicator. This
is an open-drain logic output pin that is pulled to ground
whentheoutputvoltage(andaccordingly,thedivided-down
LTM4641, connect V to V and to the gate of the
externalpower-interruptN-channelMOSFETfeedingV
ING
INGP
,
INH
identified on the front page schematic as MSP; otherwise,
leave this pin electrically open circuit.
representation of the output voltage, V , as presented to
FB
the control loop) is outside 10% of the nominal target
for regulation.
V
(ꢁ10): Gate Drive Protection Pin. If utilizing the ad-
INGP
vanced OOV protection features of the LTM4641, connect
TRACK/SS (L2): Output Voltage Tracking and Soft-Start
Programming Pin. This pin has a 1.0μA pull-up current
source, typical. A capacitor can be placed from this pin to
V
toV andtothegateoftheexternalpower-interrupt
INGP
ING
N-channel MOSFET feeding V , MSP; otherwise, leave
INH
this pin electrically open circuit.
4641f
14
Linear [ Linear ]
