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RC1117 Datasheet, PDF (1/9 Pages) Fairchild Semiconductor – 1A Adjustable/Fixed Low Dropout Linear Regulator | |||
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www.fairchildsemi.com
RC1117
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-263, and TO-252 packages
⢠Three-terminal adjustable or ï¬xed 2.5V, 2.85V, 3.3V, 5V
Applications
⢠Active SCSI terminators
⢠High efï¬ciency 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 speciï¬cally to be
used in Active Terminators for SCSI bus.
Current limit is trimmed to ensure speciï¬ed 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 ï¬ows into the load, increasing efï¬ciency.
The RC1117 series regulators are available in the industry-
standard SOT-223, TO-263 (D2PAK), and TO-252 (DPAK)
power packages.
Typical Applications
VIN = 3.3V
+
10µF
RC1117
VIN
VOUT
ADJ
VOUT = VREF(1 + R2/R1) + IAdj ⢠R2
VIN = 5V
+
10µF
RC1117-2.85
VIN
VOUT
GND
R1
124â¦
+
1.5V at 1A
22µF
R2
24.9â¦
+
2.85V at 1A
22µF
REV. 1.3.2 10/16/03
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