1117AT33 Datasheet | Fairchild Semiconductor

Features - - - - - - Low dropout voltage Load regulation: 0.05% typical Trimmed current limit On-chip thermal limiting Standard SOT-223, TO-220, and TO-252 packages Three-terminal adjustable or fixed 1.8V, 2.5V, 2.85V, 3.3V, 5V Description The FAN1117A and FAN1117A-1.8, -2.5, -2.85, -3.3 and -5 are low dropout three-terminal regulators with 1A output current capability. These devices have been optimized for low voltage where transient response and minimum input voltage are critical. The 2.85V version is designed specifically to be used in Active Terminators for SCSI bus. Current limit is trimmed to ensure specified output current and controlled short-circuit current. On-chip thermal limiting provides protection against any bination of overload and ambient temperatures that would create excessive junction temperatures. Unlike PNP type regulators where up to 10% of the output current is wasted as quiescent current, the quiescent current of the FAN1117A flows into the load, increasing efficiency. The FAN1117A series regulators are available in the industry-standard SOT-223, TO-220, and TO-252 (DPAK) power packages. Applications - - - - - - Active SCSI terminators High efficiency linear regulators Post regulators for switching supplies Battery chargers 12V to 5V linear regulators Motherboard clock supplies Typical Applications FAN1117A VIN = 12V 10µF + VIN ADJ VOUT R1 124Ω + 9V at 1A 22µF VOUT = VREF(1 + R2/R1) + IADJ - R2 R2 768Ω FAN1117A-5 VIN = 12V 10µF + VIN GND VOUT + 5V at 1A 22µF REV. 1.1.0 11/7/03 PRODUCT SPECIFICATION FAN1117A Pin Assignments .. Front View Tab is VOUT Front View Tab is VOUT Front View 3 Tab is VOUT 2 1 IN OUT ADJ/GND ADJ/ OUT GND 4-Lead Plastic SOT-223 ΘJC = 15°C/W- IN ADJ/ OUT IN GND 3-Lead Plastic TO-220 ΘJC = 3°C/W- 1 2 3 1 2 3 3-Lead Plastic TO-252 ΘJC = 3°C/W- - With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane, ΘJA can vary from 30°C/W to more than 50°C/W. Other mounting...