This is one Lot (Qty. 2) of New National Semiconductor 3A Step-Up Voltage Regulator. Part Number: LM2577T-ADJ in TO-220-5 Package.

General Spec:

• Input Voltage Range: 3.5V to 40V
• Output Voltage: Adjustable  to 60V
• Output Current: 3A Guaranteed
• Current Limit: 3.7A min.5.3A max.
• Operating Junction Temperature:  to +150C
• Package: TO-220-5

Detail Spec on Web as follows:

http://www.ti.com/lit/ds/symlink/lm1577.pdf