Datasheet

LTC3675/LTC3675-1
15
36751fc
For more information www.linear.com/LTC3675
pin FuncTions
WAKE (Pin 26): Open Drain Output. When the ONB pin
is pressed and released, the signal is debounced and the
WAKE signal is held HIGH for a minimum time period that
is scaled by the C
T
capacitor.
LED_FS (Pin 27): A resistor connected from this pin to
GND programs full-scale LED current.
ONB (Pin 28): Pushbutton Input. Active low.
LDOFB (Pin 29): LDO Feedback Pin. A resistor divider
from LDO_OUT to GND provides feedback.
LDO_OUT (Pin 30): Output of Always-On LDO. Decouple
with a 10µF capacitor to GND.
V
IN
(Pin 31): Quiet Input Supply Used to Power Non-
Switching Control Circuitry. A 2.2µF decoupling capacitor
to GND is recommended. Must be connected to all other
V
IN
supply pins (Pins 6, 7, 10, 34, 40).
SW5 (Pin 32): Boost Regulator Switch Node. External
inductor connects to this pin.
V
OUT5
(Pin 33): Boost Regulator Output. Connect two
22µF capacitors to GND.
V
IN
(Pin 34): Quiet Input Supply Used to Power Non-
Switching Control Circuitry. A 2.2µF decoupling capacitor
to GND is recommended. Must be connected to all other
V
IN
supply pins (Pins 6, 7, 10, 31, 40).
FB5 (Pin 35): Boost Regulator Feedback Pin. Receives
feedback by a resistor divider connected across the output.
FB6 (
Pin 36): Buck-Boost
Regulator Feedback Pin. Receives
feedback by a resistor divider connected across the output.
ENBB (Pin 37): Buck-Boost Regulator Enable Input. Ac-
tive high. This pin is a high impedance input; do not float.
SWAB6 (Pin 38): Buck-Boost Regulator Switch Pin. Ex-
ternal inductor connects to this pin and SWCD6.
SCL (Pin 39): Clock Line for I
2
C Port.
V
IN
(Pin 40): Buck-Boost Regulator Input Supply. A 10µF
decoupling capacitor to GND is recommended. Must be
connected to all other V
IN
supply pins (Pins 6, 7, 10, 31, 34).
DV
CC
(Pin 41): Supply Pin for I
2
C Port.
V
OUT6
(Pins 42): Buck-Boost Regulator Output. Connect
a 22µF capacitor to GND.
SDA (Pin 43): Serial Data Line for I
2
C Port. Open drain
output during readback.
SWCD6 (Pin 44): Buck-Boost Regulator Switch Pin. Ex-
ternal inductor connects to this pin and SWAB6.
GND (Exposed Pad Pin 45): Ground for Entire Chip. Must
be soldered to PCB for electrical contact and rated thermal
performance.