LTC3890EGN-1 LINER [Linear Technology], LTC3890EGN-1 Datasheet - Page 9

• Manufacturer Part Number: LTC3890EGN-1
• Description: 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
• Manufacturer: LINER [Linear Technology]

BG1, BG2 (Pin 23, Pin 18): High Current Gate Drives for
Bottom (Synchronous) N-Channel MOSFETs. Voltage
swing at these pins is from ground to INTV
BOOST1, BOOST2 (Pin 24, Pin 17): Bootstrapped Supplies
to the Topside Floating Drivers. Capacitors are connected
between the BOOST and SW pins and Schottky diodes are
tied between the BOOST and INTV
at the BOOST pins is from INTV
SW1, SW2 (Pin 25, Pin 16): Switch Node Connections
to Inductors.
TG1, TG2 (Pin 26, Pin 15): High Current Gate Drives for
Top N-Channel MOSFETs. These are the outputs of fl oat-
ing drivers with a voltage swing equal to INTV
superimposed on the switch node voltage SW.
PIN FUNCTIONS
CC
CC
to (V
pins. Voltage swing
IN
+ INTV
CC
.
CC
CC
– 0.5V
).
PGOOD1 (Pin 27): Open-Drain Logic Output. PGOOD1 is
pulled to ground when the voltage on the V
within ±10% of its set point.
TRACK/SS1, TRACK/SS2 (Pin 28, Pin 14): External
Tracking and Soft-Start Input. The LTC3890-1 regulates
the V
on the TRACK/SS1,2 pin. An internal 1μA pull-up current
source is connected to this pin. A capacitor to ground at
this pin sets the ramp time to fi nal regulated output volt-
age. Alternatively, a resistor divider on another voltage
supply connected to this pin allows the LTC3890-1 output
to track the other supply during start-up.
FB1,2
voltage to the smaller of 0.8V or the voltage
LTC3890-1
FB1
pin is not
38901f
9