The ATLSXA201D series diode laser drivers are designed for driving laser diodes with low noise constant current at high efficiency.
The "XA" in the part number specifies the maximum output current of the modules, which can be: 500mA, 1A, 2A, 3A, 4A and 6A respectively and the maximum output voltage is up to 2.7V when powered by a 3.3V power supply and 4.2V by a 5V power supply.

High Efficiency: ≥90%
Maximum Output Current: 500mA, 1A, 2A, 3A, 4A, 6A
Current Output Noise: 0.05%
High Stability: 100ppm/°C
High Reliability and Zero EMI
Compact Size
DIP Package Available
100 % lead (Pb)-free and RoHS compliant

For more detailed information, please check:

http://www.analogtechnologies.com/ATLSXA201D.html

For more types of laser drivers, please check:

http://www.analogtechnologies.com/laserdriver.html