LTC3370_15 Datasheet, PDF (12/24 Pages) Linear Technology – 4-Channel 8A Configurable Buck DC/DCs

LTC3370
Pin Functions
V_INA (Pin 1): Power Stage A Input Supply. Bypass to GND
with a 10µF or larger ceramic capacitor.
SWA (Pin 2): Power Stage A Switch Node. External induc-
tor connects to this pin.
SWB (Pin 3): Power Stage B Switch Node. External induc-
tor connects to this pin.
V_INB (Pin 4): Power Stage B Input Supply. Bypass to GND
with a 10µF or larger ceramic capacitor.
V_INC (Pin 5): Power Stage C Input Supply. Bypass to GND
with a 10µF or larger ceramic capacitor.
SWC (Pin 6): Power Stage C Switch Node. External induc-
tor connects to this pin.
SWD (Pin 7): Power Stage D Switch Node. External induc-
tor connects to this pin.
V_IND (Pin 8): Power Stage D Input Supply. Bypass to GND
with a 10µF or larger ceramic capacitor.
FB2 (Pin 9): Buck Regulator 2 Feedback Pin. Receives
feedback by a resistor divider connected across the output.
In configurations where Buck 2 is not used, FB2 should
be tied to ground.
EN2 (Pin 10): Buck Regulator 2 Enable Input. Active high.
In configurations where Buck 2 is not used, tie EN2 to
ground. Do not float.
C1 (Pin 11): Configuration Control Input Bit. With C2 and
C3, C1 configures the Buck output current power stage
combinations. C1 should either be tied to V_CC or ground.
Do not float.
C2 (Pin 12): Configuration Control Input Bit. With C1 and
C3, C2 configures the Buck output current power stage
combinations. C2 should either be tied to V_CC or ground.
Do not float.
C3 (Pin 13): Configuration Control Input Bit. With C1 and
C2, C3 configures the Buck output current power stage
combinations. C3 should either be tied to V_CC or ground.
Do not float.
PGOODALL (Pin 14): PGOOD Status Pin (Active Low).
Open-drain output. When the regulated output voltage
of any enabled switching regulator is below its PGOOD
threshold level, this pin is driven LOW. This level is 98%
of the programmed output value for Buck 1 and 95% of
the programmed output value for Bucks 2-4. When all
buck regulators are disabled PGOODALL is driven LOW.
EN3 (Pin 15): Buck Regulator 3 Enable Input. Active high.
In configurations where Buck 3 is not used, tie EN3 to
ground. Do not float.
FB3 (Pin 16): Buck Regulator 3 Feedback Pin. Receives
feedback by a resistor divider connected across the output.
In configurations where Buck 3 is not used, FB3 should
be tied to ground.
V_INE (Pin 17): Power Stage E Input Supply. Bypass to GND
with a 10µF or larger ceramic capacitor.
SWE (Pin 18): Power Stage E Switch Node. External
inductor connects to this pin.
SWF (Pin 19): Power Stage F Switch Node. External
inductor connects to this pin.
V_INF (Pin 20): Power Stage F Input Supply. Bypass to GND
with a 10µF or larger ceramic capacitor.
V_ING (Pin 21): Power Stage G Input Supply. Bypass to
GND with a 10µF or larger ceramic capacitor.
SWG (Pin 22): Power Stage G Switch Node. External
inductor connects to this pin.
SWH (Pin 23): Power Stage H Switch Node. External
inductor connects to this pin.
V_INH (Pin 24): Power Stage H Input Supply. Bypass to
GND with a 10µF or larger ceramic capacitor.
FB4 (PIN 25): Buck Regulator 4 Feedback Pin. Receives
feedback by a resistor divider connected across the output.
EN4 (Pin 26): Buck Regulator 4 Enable Input. Active high.
Do not float.
3370f
12
For more information www.linear.com/LTC3370