3083 Просмотр технического описания (PDF) - Linear Technology

Номер в каталоге

Компоненты Описание

производитель

3083

Adjustable 3A Single Resistor Low Dropout Regulator

Linear Technology 

LT3083

PIN FUNCTIONS (DF/FE/Q/T Packages)

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 Sup-

ply. 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 voltage

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

voltage (see dropout specifications in the Electrical Char-

acteristics 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 Stabil-

ity 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.

BLOCK DIAGRAM

IN

VCONTROL

50µA

+

–

SET

3083 BD

OUT

3083fa

9

Share Link: