LTC4242IUHF#PBF Linear Technology, LTC4242IUHF#PBF Datasheet - Page 9

• Manufacturer Part Number: LTC4242IUHF#PBF
• Description: IC CTRLR HOTSWAP DUAL-SLOT 38QFN
• Manufacturer: Linear Technology
• Type: Hot-Swap Controllerr

Specifications of LTC4242IUHF#PBF

• Applications: General Purpose, PCI Express
• Internal Switch(s): No
• Voltage - Supply: 2.7 V ~ 6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 38-WFQFN, Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PI FU CTIO S
AUXPGOOD1/AUXPGOOD2 (QFN): AUX Supply Power
Status Output. This open-drain pin is pulled high by an
internal 9µA pull-up when AUXOUTn is below power good
threshold, when ENn is high, during thermal shutdown,
AUXONn is low or when V
EN1/EN2: Card Presence/Slot Insert Detect Input. ENn
pin must be pulled below 1.235V to enable the system.
An internal 9µA pull-up current source is present on this
pin.
Exposed Pad (QFN): Power Ground. PCB electrical con-
nection is optional.
FAULT1/FAULT2: Main Supplies Fault Status Output.
FAULTn is pulled high by an internal 9µA pull-up. When an
overcurrent fault occurs at either the 12V or 3.3V supply,
FAULTn is latched low.
FON1/FON2: Force On Digital Input. For diagnostic pur-
poses, a high input overrides undervoltage and overcurrent
faults on 12V, 3.3V and AUX channels and input commands
U
U
U
CC
or AUXINn are in UVLO.
on the ONn and AUXONn pins. However, UVLO on V
would shut off the switches. Caution! There is no current
limit mechanism in this mode. Connect FONn to ground
to disable the fault override feature.
GND: Device Ground. Connect to a ground plane.
ON1/ON2: Main Supply On Control Input. A rising edge
turns on the external MOSFETs for the 12V and 3.3V sup-
plies, while a falling edge turns them off. Pull this pin below
0.6V to clear the faults on 12V and 3.3V channels.
PGOOD1/PGOOD2: Main Supply Power Status Output. This
open-drain pin is pulled high by an internal 9µA pull-up
when 12V
when ENn is high, ONn is low or when V
main supplies are in UVLO.
V
internal undervoltage lockout circuit disables the part until
the voltage at V
CC
: Device Supply Input. Operates from 2.7V to 6V. An
OUTn
or 3V
CC
exceeds 2.45V.
OUTn
is below power good threshold,
LTC4242
CC
or any of the
9
4242f
CC