Datasheet

LTC3374
12
3374fa
For more information www.linear.com/LTC3374
pin FuncTions
(QFN/TSSOP)
V
IN5
(Pin 21/Pin 24): Buck Regulator 5 Input Supply.
Bypass to GND with a 10µF or larger ceramic capacitor.
May be driven by an independent supply or must be
shorted to V
IN4
when buck regulator 5 is combined with
buck regulator 4 for higher current.
SW5 (Pin 22/Pin 25): Buck Regulator 5 Switch Node.
External inductor connects to this pin.
SW6 (Pin 23/Pin 26): Buck Regulator 6 Switch Node.
External inductor connects to this pin.
V
IN6
(Pin 24/Pin 27): Buck Regulator 6 Input Supply.
Bypass to GND with a 10µF or larger ceramic capacitor.
May be driven by an independent supply or must be
shorted to V
IN5
when buck regulator 6 is combined with
buck regulator 5 for higher current.
FB6 (Pin 25/Pin 28): Buck Regulator 6 Feedback Pin.
Receives feedback by a resistor divider connected across
the output. Connecting FB6 to V
IN6
combines buck regula-
tor 6 with buck
regulator 5 for higher current. Up to four
converters may be combined in this way.
FB7 (Pin 26/Pin 29): Buck Regulator 7 Feedback Pin.
Receives feedback by a resistor divider connected across
the output. Connecting FB7 to V
IN7
combines buck regula-
tor 7 with buck
regulator 6 for higher current. Up to four
converters may be combined in this way.
V
IN7
(Pin 27/Pin 30): Buck Regulator 7 Input Supply.
Bypass to GND with a 10µF or larger ceramic capacitor.
May be driven by an independent supply or must be
shorted to V
IN6
when buck regulator 7 is combined with
buck regulator 6 for higher current.
SW7 (Pin 28/Pin 31): Buck Regulator 7 Switch Node.
External inductor connects to this pin.
SW8 (Pin 29/Pin 32): Buck Regulator 8 Switch Node.
External inductor connects to this pin.
V
IN8
(Pin 30/Pin 33): Buck Regulator 8 Input Supply.
Bypass to GND with a 10µF or larger ceramic capacitor.
May be driven by an independent supply or must be
shorted to V
IN7
when buck regulator 8 is combined with
buck regulator 7 for higher current.
FB8 (Pin 31/Pin 34): Buck Regulator 8 Feedback Pin.
Receives feedback by a resistor divider connected across
the output. Connecting FB8 to V
IN8
combines buck regula-
tor 8 with buck
regulator 7 for higher current. Up to four
converters may be combined in this way.
EN8 (Pin 32/Pin 35): Buck Regulator 8 Enable Input.
Active high.
EN7 (Pin 33/Pin 36): Buck Regulator 7 Enable Input.
Active high.
MODE (Pin 34/Pin 37): Logic Input. MODE enables Burst
Mode functionality for all the buck switching regulators
when the pin is set
low. When the pin is set high, all the
buck
switching regulators will operate in forced continu-
ous mode.
V
CC
(Pin 35/Pin 38): Internal Bias Supply. Bypass to GND
with a 10µF or larger ceramic capacitor.
TEMP (Pin 36/Pin 1): Temperature Indication Pin. TEMP
outputs a voltage of 150mV (typical) at room tempera-
ture. The TEMP voltage will change by 6.75mV/°C (typical)
giving an external indication of the LTC3374 internal die
temperature.
EN2 (Pin 37/Pin 2): Buck Regulator 2 Enable Input.
Active high.
EN
1 (
Pin 38/Pin 3): Buck Regulator 1 Enable Input.
Active high.
GND
(Exposed Pad Pin 39/Exposed Pad Pin 39): Ground.
The exposed pad must be connected to a continuous
ground plane on the printed circuit board directly under
the LTC3374 for electrical contact and rated thermal
performance.