LTC4260
9
4260fc
For more information
pin FuncTions
SDAO: Serial Bus Data Output. Open-drain output used for
sending data back to the master controller or acknowledg-
ing a write operation. Normally tied to SDAI to form the
SDA line. An external pull-up resistor or current source
is required.
SENSE: Current Sense Input. Connect this pin to the out-
put of the current sense resistor. The current limit circuit
controls the GATE pin to limit the sense voltage between
the V
DD
and SENSE pins to 50mV or less depending on
the voltage at the FB pin. This pin is used as an input to
the 8-bit ADC.
SOURCE: N-Channel MOSFET Source Connection and
ADC Input. Connect this pin to the source of the external
N-channel MOSFET switch. This pin also serves as the
ADC input to monitor output voltage. The pin provides a
return for the gate pull-down circuit and as a supply for
the charge pump circuit.
TIMER: Timer Input. Connect a capacitor between this pin
and ground to set a 12ms/µF duration for current limit
before the switch is turned off. The duration of the off
time is 518ms/µF when autoretry during current limit is
enabled. A minimum value of 0.1nF must be connected
to this pin.
UV: Undervoltage Comparator Input. Connect this pin
to an external resistive divider from V
DD
. If the voltage
at this pin falls below 3.12V, an undervoltage fault is
detected and the switch turns off. Pulling this pin below
1.2V resets all faults and allows the switch to turn back
on. Tie to INTV
CC
if unused.
V
DD
: Supply Voltage and Current Sense Input. This pin
has an undervoltage lockout threshold of 7.45V.
V
DDK
(UH Package): Same as V
DD
. Connect this pin to
V
DD
. V
DDK
tied to V
DD
internally with 18Ω.
