LTC3810EG LINER [Linear Technology], LTC3810EG Datasheet - Page 10

• Manufacturer Part Number: LTC3810EG
• Description: 100V Current Mode Synchronous Switching Regulator Controller
• Manufacturer: LINER [Linear Technology]

LTC3810
PIN FUNCTIONS
BG (Pin 19): Bottom Gate Drive. The BG pin drives the
gate of the bottom N-channel synchronous switch MOSFET.
This pin swings from BGRTN to DRV
BGRTN (Pin 20): Bottom Gate Return. This pin connects to
the source of the pull-down MOSFET in the BG driver and
is normally connected to ground. Connecting a negative
supply to this pin allows the synchronous MOSFET ’s gate
to be pulled below ground to help prevent false turn-on
during high dV/dt transitions on the SW node. See the
Applications Information section for more details.
SENSE
parator Input. The (+) input to the current comparator is
normally connected to SW unless using a sense resistor.
The (–) input is used to accurately kelvin sense the bottom
side of the sense resistor or MOSFET.
10
+
, SENSE
–
(Pin 25, Pin 21): Current Sense Com-
CC
.
SW (Pin 26): Switch Node Connection to Inductor and
Bootstrap Capacitor. Voltage swing at this pin is from a
Schottky diode (external) voltage drop below ground
to V
TG (Pin 27): Top Gate Drive. The TG pin drives the gate of
the top N-channel synchronous switch MOSFET. The TG
driver draws power from the BOOST pin and returns to the
SW pin, providing true fl oating drive to the top MOSFET.
BOOST (Pin 28): Top Gate Driver Supply. The BOOST pin
supplies power to the fl oating TG driver. BOOST should
be bypassed to SW with a low ESR (X5R or better) 0.1μF
capacitor. An additional fast recovery Schottky diode from
DRV
charge-pumped supply at BOOST.
IN
CC
.
to the BOOST pin will create a complete fl oating
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