LTC3719 LINER [Linear Technology], LTC3719 Datasheet - Page 9

• Manufacturer Part Number: LTC3719
• Description: 2-Phase, High Efficiency, Step-Down Controller for AMD Opteron CPUs
• Manufacturer: LINER [Linear Technology]

PI FU CTIO S
SW2, SW1 (Pins 25, 34): Switch Node Connections to
Inductors. Voltage swing at these pins is from a Schottky
diode (external) voltage drop below ground to V
BOOST2, BOOST1 (Pins 26, 33): Bootstrapped Supplies
to the Topside Floating Drivers. External capacitors are con-
nected between the BOOST and SW pins, and Schottky
diodes are connected between the BOOST and INTV
BG2, BG1 (Pins 27, 31): High Current Gate Drives for
Bottom N-Channel MOSFETS. Voltage swing at these pins
is from ground to INTV
PGND (Pin 28): Driver Power Ground. Connect to sources
of bottom N-channel MOSFETS and the (–) terminals of C
INTV
Dropout Regulator and the EXTV
U
CC
(Pin 29): Output of the Internal 5V Linear Low
U
U
CC
.
CC
Switch. The driver and
IN
CC
.
pins.
IN
.
control circuits are powered from this voltage source.
Decouple to power ground with a 1 F ceramic capacitor
placed directly adjacent to the IC and minimum of 4.7 F
additional tantalum or other low ESR capacitor.
EXTV
Switch. This switch closes and supplies INTV
ing the internal low dropout regulator whenever EXTV
higher than 4.7V. See EXTV
tions Information section. Do not exceed 7V on this pin
and ensure V
V
coupled to the IC’s signal ground pin.
PGOOD (Pin 36): Open-Drain Logic Output. PGOOD is
pulled to ground when the voltage on the EAIN pin is not
within 10% of its set point.
IN
(Pin 32): Main Supply Pin. Should be closely de-
CC
(Pin 30): External Power Input to an Internal
EXTVCC
V
INTVCC
CC
.
Connection in the Applica-
LTC3719
CC,
sn3719 3719fs
bypass-
CC
9
is