FAN1117A

www.fairchildsemi.com

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www.fairchildsemi.com

FAN1117A
1A Adjustable/Fixed Low Dropout Linear Regulator

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 combination 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 10 F ADJ R1 124 VIN VOUT 22 F 9V at 1A

VOUT VREF(1 R2/R1) IADJ R2

R2 768

FAN1117A-5 VIN 12V 10 F GND VIN VOUT 22 F 5V at 1A

REV. 1.1.0 11/7/03