LTC3890IGN-1TRPBF datasheet(9/36 Pages) LINER

Part #	LTC3890IGN-1TRPBF

Description	60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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9 / 36 page

LTC3890-1

9

38901f

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 INTVCC.

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 INTVCC pins. Voltage swing

at the BOOST pins is from INTVCC to (VIN + INTVCC).

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 ﬂoat-

ing drivers with a voltage swing equal to INTVCC – 0.5V

superimposed on the switch node voltage SW.

PIN FUNCTIONS

PGOOD1 (Pin 27): Open-Drain Logic Output. PGOOD1 is

pulled to ground when the voltage on the VFB1 pin is not

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 VFB1,2 voltage to the smaller of 0.8V or the voltage

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 ﬁnal 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.

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