LT3083MPDF datasheet(9/28 Pages) AD

9 / 28 page

LT3083

Rev. B

For more information www.analog.com

PIN FUNCTIONS

OUT (Pins 1-5,13/Pins 1-6,8,9,16,17/Pin 3, Tab/Pin 3,

Tab): Output. The exposed pad of the DF package (Pin 13)

and the FE package (Pin 17) and the Tab of the DD-PAK

and TO-220 packages is an electrical connection to OUT.

Connect the exposed pad of the DF and FE packages and

the Tab of the DD-PAK package directly to OUT on the

PCB and the respective OUT pins for each package. There

must be a minimum load current of 1mA or the output

may not regulate.

SET (Pin 6/Pin 7/Pin 2/Pin 2): Set Point. This pin is the

non-inverting input to the error amplifier and the regula-

tion set point. A fixed current of 50μA flows out of this

pin through a single external resistor, which programs

the output voltage of the device. Output voltage range is

zero to the VIN(MAX) – VDROPOUT. Transient performance

can be improved by adding a small capacitor from the

SET pin to ground.

VCONTROL (Pins 7,8/Pins 10,11/Pin 4/Pin 4): Bias

Supply. This is the supply pin for the control circuitry of

the device. Minimum input capacitance is 2.2µF (see Input

Capacitance and Stability in the Applications Information

section). The current flow into this pin is about 1.7% of

the output current. For the device to regulate, this volt-

age must be more than 1.2V to 1.4V greater than the

output voltage (see dropout specifications in the Electrical

Characteristics section).

IN (Pins 9-12/Pins 12-15/Pin 5/Pin 5): Power Input.

This is the collector to the power device of the LT3083.

The output load current is supplied through this pin.

Minimum IN capacitance is 10µF (see Input Capacitance

and Stability in Applications Information section). For the

device to regulate, the voltage at this pin must be more

than 0.1V to 0.5V greater than the output voltage (see

dropout specifications in the Electrical Characteristics

section).

NC (NA/NA/Pin 1/Pin 1): No Connection. No Connect

pins have no connection to internal circuitry and may be

tied to VIN, VCONTROL, VOUT, GND, or floated.

(DF/FE/Q/T Packages)

BLOCK DIAGRAM

–

VCONTROL

50µA

3083 BD

OUT

SET

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