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LR1117A_15 Datasheet, PDF (1/9 Pages) Leshan Radio Company – Fixed Low Dropout Linear Regulator | |||
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LESHAN RADIO COMPANY, LTD.
LR1117A
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 ï¬xed 1.8V, 2.5V, 2.85V,
3.3V, 5V
Applications
⢠Active SCSI terminators
⢠High efï¬ciency linear regulators
⢠Post regulators for switching supplies
⢠Battery chargers
⢠12V to 5V linear regulators
⢠Motherboard clock supplies
Description
The LR1117A and LR1117A-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 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 LR1117A ï¬ows into the load, increasing efï¬ciency.
The LR1117A series regulators are available in the
industry-standard SOT-223, TO-220, and TO-252 (DPAK)
power packages.
Typical Applications
VIN = 12V
+
10µF
LR1117A
VIN
VOUT
ADJ
VOUT = VREF(1 + R2/R1) + IADJ ⢠R2
R1
124â¦
+
9V at 1A
22µF
R2
768â¦
VIN = 12V
+
10µF
LR1117A-5
VIN
VOUT
GND
+
5V at 1A
22µF
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