LT3694 datasheet(12/34 Pages) LINER

Part #	LT3694

Description	40V 400mA Step-Down Switching Regulator with Dual Fault Protected LDOs

PDF	34 Pages

Scroll/Zoom	100%

Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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12 / 34 page

LT3667

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For more information www.linear.com/LT3667

PIN FUNCTIONS (MSOP/QFN)

IN1 (Pin 15/Pin 20): The IN1 pin supplies current to the

internal regulator and to the internal power switch. This

pin must be locally bypassed.

DA (Pin 16/Pin 23): Connect the anode of the catch diode

(D1inBlockDiagrams)tothispin.Internalcircuitrysenses

the current through the catch diode providing frequency

foldback in overload conditions.

GND (Exposed Pad Pin 17/Exposed Pad Pin 25): This is

the ground of all internal circuitry, as well as the power

ground used by the catch diode (D1). The exposed pad

must be soldered to the PCB.

UVLO1 (Pin 19, QFN Only): The precise 1V threshold volt-

age of this pin can function as an accurate undervoltage

lockout (UVLO). The switching regulator only operates

when the voltage at the UVLO1 pin exceeds this threshold.

The LDOs are not affected by this pin.

NC (Pins 21, 22, QFN only): These pins are not connected

internally and can be left floating or tied to ground.

LT3694 Datasheet(PDF) 12 Page - Linear Technology