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LR1117A Schematic ( PDF Datasheet ) - LRC

Teilenummer LR1117A
Beschreibung 1A Adjustable/Fixed Low Dropout Linear Regulator
Hersteller LRC
Logo LRC Logo 




Gesamt 9 Seiten
LR1117A Datasheet, Funktion
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 fixed 1.8V, 2.5V, 2.85V,
3.3V, 5V
Applications
• Active SCSI terminators
• High efficiency 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 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 LR1117A flows into the load, increasing efficiency.
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
124
+ 9V at 1A
22µF
R2
768
VIN = 12V
10µF
+
LR1117A-5
VIN VOUT
GND
+ 5V at 1A
22µF
1/9






LR1117A Datasheet, Funktion
Mechanical Dimensions
4-Lead SOT-223 Package
Symbol
A
A1
B
c
D
E
e
F
H
I
J
K
L
M
N
Inches
Min. Max.
.025
.248
.130
.115
.033
.264
.012
10°
.0008
10°
.010
.071
.181
.033
.090
.264
.148
.124
.041
.287
10°
16°
.0040
16°
.014
Millimeters
Min. Max.
.640
6.30
3.30
2.95
.840
6.71
.310
10°
.0203
10°
.250
1.80
4.80
.840
2.29
6.71
3.71
3.15
1.04
7.29
10°
16°
.1018
16°
.360
Notes
D
e
HE
A
cF
LESHAN RADIO COMPANY, LTD.
LR1117A
K
J
BI
A1
N
M
L
6/9

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