LTC3416 datasheet(5/16 Pages) LINER

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LTC3416

3416f

PI FU CTIO S

PGND (Pins 1, 10, 11, 20): Power Ground. Connect this

pin closely to the (–) terminal of CIN and COUT.

RT (Pin 2): Oscillator Resistor Input. Connecting a resistor

to ground from this pin sets the switching frequency.

TRACK (Pin 3): Tracking Voltage Input. Applying a voltage

that is less than 0.8V to this pin enables tracking. During

tracking, the VFB pin will regulate to the voltage on this pin.

Do not float this pin.

RUN/SS (Pin 4): Run Control and Soft-Start Input. Forcing

this pin below 0.5V shuts down the LTC3416. In shutdown

all functions are disabled, drawing <1

µAofsupplycurrent.

A capacitor to ground from this pin sets the ramp time to

full output current.

SGND (Pin 5): Signal Ground. All small-signal compo-

nents and compensation components should connect to

this ground, which in turn connects to PGND at one point.

NC (Pins 6, 15): No Connect.

PVIN (Pins 7, 14): Power Input Supply. Decouple this pin

to PGND with a capacitor.

SW (Pins 8, 9, 12, 13): Switch Node Connection to

Inductor. This pin connects to the drains of the internal

main and synchronous power MOSFET switches.

SVIN (Pin 16): Signal Input Supply. Decouple this pin to

the SGND capacitor.

PGOOD (Pin 17): Power Good Output. Open-drain logic

output that is pulled to ground when the output voltage is

not within

±7.5% of the regulation point.

ITH (Pin 18): Error Amplifier Compensation Point. The

current comparator threshold increases with this control

voltage. Nominal voltage range for this pin is from 0.2V to

1.4V with 0.4V corresponding to the zero-sense voltage

(zero current).

VFB (Pin 19): Feedback Pin. Receives the feedback voltage

from a resistive divider connected across the output.

Exposed Pad (Pin 21): Ground. Connect to SGND.

LTC3416 Datasheet(PDF) 5 Page - Linear Technology