# UL66A Linear Constant Current LED Driver

## Description
· Linear constant current IC with built-in power MOSFET
· Output current adjustable from 5mA to 30mA
· Constant current accuracy up to ±4%
· Simple application scheme, low cost
· Includes temperature compensation and thermal shutdown

## Features
· Output Current: 5mA - 30mA
· Accuracy: ±4%
· No EMC issues
· Temperature Compensation
· Thermal Shutdown

## Ordering Information
· UL66AL-xx-AA3-R: SOT-223, Tape Reel
· UL66AG-xx-AA3-R: SOT-223, Tape Reel
· UL66AL-xx-AB3-R: SOT-89, Tape Reel
· UL66AG-xx-AB3-R: SOT-89, Tape Reel
· UL66AL-xx-TN3-R: TO-252, Tape Reel
· UL66AG-xx-TN3-R: TO-252, Tape Reel
- Note: "xx" refers to Output Voltage (see Marking Information)

## Marking Information
· SOT-223: 0.6V / 0.3V
· SOT-89: (No specific marking info given)
· TO-252: (No specific marking info given)

## Pin Description
· PIN 1 (OUT): Current Output
· PIN 2 (GND): Ground
· PIN 3 (REXT): Output Current Setting

## Absolute Maximum Ratings
· OUT Pin Voltage (VOUT): -0.5V ~ 500V
· OUT Pin Current (IOUT): 5mA ~ 30mA
· Operating Junction Temperature (TOPT): -40°C ~ +150°C
· Storage Junction Temperature (TSTG): -50°C ~ +150°C

## Electrical Characteristics
· OUT Pin Voltage (VOUT) @ IOUT=30mA: 6.5V
· Output Current (IOUT): 5mA - 30mA
· Quiescent Current (IQ) @ VOUT=10V, REXT No Collection: 0.16mA - 0.25mA
· REXT Pin Voltage (VREXT) @ VOUT=10V: 0.3V / 0.6V
· Output Current Error @ IOUT=5~30mA: ±4%
· Temperature Compensate Point (TCP): 140°C