LTC3822-1_15 Datasheet, PDF (7/24 Pages) Linear Technology – No RSENSE, Low Input Voltage, Synchronous Step-Down DC/DC Controller

LTC3822-1
PIN FUNCTIONS (DD/GN)
BG (Pin 8/Pin 11): Bottom Gate Driver Output. This pin
drives the gate of the external bottom-side MOSFET. This
pin has an output swing from GND to BOOST.
TG (Pin 9/Pin 12): Top Gate Driver Output. This pin drives
the gate of the external topside MOSFET. This pin has an
output swing from GND to BOOST.
BOOST (Pin 10/Pin 13): Positive Supply Pin for the Gate
Driver Circuitry. A bootstrapped capacitor, charged with
an external Schottky diode and a boost voltage source, is
connected between the BOOST and SW pins. Voltage swing
at the BOOST pin is from boost source voltage (typically
V_IN) to this boost source voltage + V_IN.
V_IN (Pin 11/Pin 14): This pin powers the control circuitry
and serves as the positive input to the differential current
comparator.
SW (Pin 12/Pin 16): Switch Node Connection to Inductor.
This pin is also the negative input to the differential current
comparator(DFN only) and an input to the reverse current
comparator. Normally this pin is connected to the source
of the external topside MOSFET, the drain of the external
bottom-side MOSFET, and the inductor.
Exposed Pad (Pin 13, DD Only): Ground. The Exposed
Pad is ground and must be soldered to the PCB ground
for electrical contact and optimal thermal performance.
GND (Pins 1, 9 GN Only): Ground.
PGOOD (Pin 4, GN Only): Power Good Output Voltage
Monitor Open-Drain Logic Output. This pin is pulled to
ground when the voltage on the feedback pin V_FB is not
within ±13.3% of its nominal set point.
SENSE^– (Pin 15, GN Only): Negative Input to the Differential
Current Comparator. Normally this pin is connected to the
source of the external topside MOSFET.
38221f
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