LTC1798 Series

5

DNC (Pins 1, 5, 7, 8): Do Not Connect. Connected

internally for post package trim. These pins must be left

unconnected.

IN (Pin 2): Positive Supply. Bypassing with a 0.1

µF

capacitor is recommended if the output loading changes.

DNC (Pin 3): (LTC1798-2.5/LTC1798-3/LTC1798-4.1/

LTC1798-5) Do Not Connect. Connected internally for

post package trim. This pin must be left unconnected.

FB (Pin 3): (LTC1798) Resistor Divider Feedback Pin.

Connect a resistor divider from OUT to GND and the center

tap to FB. This pin sets the output potential.

VV

RR

R

+









2 385

12

2

to FB and R2 from FB to GND. Selecting R2

≥ 10k will

GND (Pin 4): Negative Supply or Ground Connection.

OUT (Pin 6): Reference Output. The output can source up

to 10mA and sink up to 2mA. It is stable with output bypass

capacitor ranging from 0

µF to 1µF.

–

+

IN

6

1798 BD

2

4

OUT

3 (LTC1798)

FB

2.385V

GND

R1

R2

NOTE: R1 AND R2 ARE NOT CONNECTED FOR LTC1798

BLOCK DIAGRA

PI FU CTIO S