Datasheet

LTC3780
11
Rev G
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PIN FUNCTIONS
(SSOP/QFN)
BG2, BG1 (Pins 16, 18/Pins 18, 20): Bottom Gate Drive.
Drives the gate of the bottom N-channel MOSFET between
ground and INTV
CC
.
PGND (Pin 17/Pin 19): Power Ground. Connect this pin
closely to the source of the bottom N-channel MOSFET, the
(–) terminal of C
VCC
and the (–) terminal of C
IN
(Figure 11).
INTV
CC
(Pin 19/Pin 21): Internal 6V Regulator Output. The
driver and control circuits are powered from this voltage.
Bypass this pin to ground with a minimum of 4.7µF low
ESR tantalum or ceramic capacitor.
EXTV
CC
(Pin 20/Pin 22): External V
CC
Input. When EXT-
V
CC
exceeds 5.7V, an internal switch connects this pin to
INTV
CC
and shuts down the internal regulator so that the
controller and gate drive power is drawn from EXTV
CC
. Do
not exceed 7V at this pin and ensure that EXTV
CC
< V
IN
.
V
IN
(Pin 21/Pin 23): Main Input Supply. Bypass this pin
to SGND with an RC filter (1Ω, 0.1µF).
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