www.fairchildsemi.com

REV. 1.3.2 10/16/03

Features

• Low dropout voltage

• Load regulation: 0.05% typical

• Trimmed current limit

• On-chip thermal limiting

• Standard SOT-223, TO-263, and TO-252 packages

• Three-terminal adjustable or fixed 2.5V, 2.85V, 3.3V, 5V

Applications

• Active SCSI terminators

• High efficiency linear regulators

• Post regulators for switching supplies

• Battery chargers

• 5V to 3.3V linear regulators

• Motherboard clock supplies

Description

The RC1117 and RC1117-2.5, -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 RC1117 flows into the load, increasing efficiency.

The RC1117 series regulators are available in the industry-

standard SOT-223, TO-263 (D2PAK), and TO-252 (DPAK)

power packages.

Typical Applications

ADJ

1.5V at 1A

RC1117

10

µF22µF

R1

124

Ω

R2

24.9

Ω

GND

2.85V at 1A

RC1117-2.85

10

µF

++

+

+

22

µF

RC1117

1A Adjustable/Fixed Low Dropout Linear Regulator