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Número de pieza | LR1117A | |
Descripción | 1A Adjustable/Fixed Low Dropout Linear Regulator | |
Fabricantes | LRC | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de LR1117A (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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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
124Ω
+ 9V at 1A
22µF
R2
768Ω
VIN = 12V
10µF
+
LR1117A-5
VIN VOUT
GND
+ 5V at 1A
22µF
1/9
1 page LESHAN RADIO COMPANY, LTD.
LR1117A
Typical Performance Characteristics (continued)
2.0
1.75
1.5
1.25
1.0
-75 -50 -25 0 25 50 75 100 125 150 175
JUNCTION TEMPERATURE (°C)
Figure 8. Short-Circuit Current vs. Temperature
90
80
70
60
50
40
30
20 (VIN - VOUT) = 3V
0.5 < VRIPPLE < 2V
10 IOUT = 1A
0
10 100
1K
10K
FREQUENCY (Hz)
100K
Figure 9. Ripple Rejection vs. Frequency
10
7.5
TO-252, TO-220
5
SOT-223
2.5
0
25 45 65 85 105 125
CASE TEMPERATURE (°C)
Figure 10. Maximum Power Dissipation
5000
4000
VIN = 12V
10ma < IOUT < IMAX
3000
VIN = 5V
2000
Instability
region
1000
Region of Stability
(SOA)
0
0 1 2 3 4 5 6 7 8 9 10
VOUT (V)
Figure 11. Stability Region (SOA) vs. ESR of the COUT
5/9
5 Page |
Páginas | Total 9 Páginas | |
PDF Descargar | [ Datasheet LR1117A.PDF ] |
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