LR1117AT18 [LRC]
1A Adjustable/Fixed Low Dropout Linear Regulator;
| 型号： | LR1117AT18 |
| 厂家： | 
LESHAN RADIO COMPANY |
| 描述： | 1A Adjustable/Fixed Low Dropout Linear Regulator |
| 文件： | 总9页 (文件大小：148K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LESHAN RADIO COMPANY, LTD.
LR1 1 1 7 A
1 A Ad ju s t a b le /Fix e d Lo w Dro p o u t Lin e a r Re g u la t o r
Features
Description
• Low dropout voltage
• Load regulation: 0.05% typical
• Trimmed current limit
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.
• 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
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.
Applications
• Active SCSI terminators
• High efficiency linear regulators
• Post regulators for switching supplies
• Battery chargers
• 12V to 5V linear regulators
• Motherboard clock supplies
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
LR1117A
VIN = 12V
VIN
VOUT
9V at 1A
+
+
10µF
22µF
R1
124Ω
ADJ
R2
768Ω
VOUT = VREF(1+R2/R1) + IADJ • R2
LR1117A-5
VIN = 12V
VIN
VOUT
5V at 1A
+
+
10µF
22µF
GND
1/9
LESHAN RADIO COMPANY, LTD.
LR1 1 1 7 A
Front View
Tab is VOUT
Pin Assignments
Front View
Tab is VOUT
1
2
3
Front View
3
IN
Tab is
VOUT
1
2
3
2
OUT
1
ADJ/GND
ADJ/ OUT IN
GND
ADJ/ OUT IN
GND
4-Lead Plastic SOT-223
3-Lead Plastic TO-252
3-Lead Plastic TO-220
ΘJC = 15°C/W*
ΘJC = 3°C/W*
ΘJC = 3°C/W*
*With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane, ΘJA can vary from
30°C/W to more than 50°C/W. Other mounting techniques may provide better thermal resistance than 30°C/W.
Absolute Maximum Ratings
Parameter
Min.
Max.
18
Unit
VIN
V
(VIN – VOUT) * IOUT
See Figure 1
125
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 sec.)
0
°C
°C
°C
-65
150
300
1.2
1.0
0.8
0.6
0.4
0.2
0
0
2
4
6
8
10
12
14
16
18
20
V
IN – VOUT (V)
Figure 1. Absolute Maximum Safe Operating Area
2/9
LESHAN RADIO COMPANY, LTD.
LR1 1 1 7 A
Electrical Characteristics
Operating Conditions: VIN ≤ 7V, TJ = 25°C unless otherwise specified.
The • denotes specifications which apply over the specified operating temperature range.
Parameter
Conditions
Min.
Typ.
Max. Units
Reference Voltage3
1.5V ≤ (VIN – VOUT) ≤ 7V,
10mA ≤ IOUT ≤ 1A
•
1.225
(-2%)
1.250
1.275
(+2%)
V
Output Voltage4
10mA ≤ IOUT ≤ 1A
LR1117A-1.8, 3.3V ≤ VIN ≤ 8.8V
LR1117A-2.5, 4V ≤ VIN ≤ 9.5V
LR1117A-2.85, 4.35V ≤ VIN ≤ 9.85V
LR1117A-3.3, 4.8V ≤ VIN ≤ 10.3V
LR1117A-5, 6.5V ≤ VIN ≤ 12V
•
•
•
•
•
1.764
2.450
2.793
3.234
4.900
1.8
2.5
2.85
3.3
1.836
2.550
2.907
3.366
5.100
V
V
V
V
V
5.0
Line Regulation1,2
Load Regulation1,2
Dropout Voltage
Current Limit
Adjust Pin Current3
Adjust Pin Current Change3,4 1.5V ≤ (VIN – VOUT) ≤ 7V,
10mA ≤ IOUT ≤ 1A
(VOUT + 1.5V) ≤ VIN ≤ 12V, IOUT = 10mA
(VIN – VOUT) = 2V, 10mA ≤ IOUT ≤ 1A
∆VREF = 1%, IOUT = 1A
•
•
•
•
•
•
0.005
0.05
1.100
1.5
0.2
0.5
%
%
V
1.200
(VIN – VOUT) = 2V
1.1
A
35
120
5
µA
µA
0.2
Minimum Load Current
Quiescent Current
Ripple Rejection
1.5V ≤ (VIN – VOUT) ≤ 15V
•
•
10
60
mA
mA
dB
VIN = VOUT + 1.25V
4
13
f = 120Hz, COUT = 22µF Tantalum,
(VIN – VOUT) = 3V, IOUT = 1A
72
Thermal Regulation
Temperature Stability
Long-Term Stability
RMS Output Noise
TA = 25°C, 30ms pulse
0.004
0.5
0.02
1.0
%/W
%
•
TA = 125°C, 1000hrs.
0.03
0.003
%
TA = 25°C, 10Hz ≤ f ≤ 10kHz
%
(% of VOUT
)
Thermal Resistance, Junction SOT-223
to Case
15
3
°C/W
°C/W
°C
TO-252, TO-220
Thermal Shutdown
Junction Temperature
155
10
Thermal Shutdown
Hysteresis
°C
Notes:
1. See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are
measured at a constant junction temperature by low duty cycle pulse testing.
2. Line and load regulation are guaranteed up to the maximum power dissipation (18W). Power dissipation is determined by
input/output differential and the output current. Guaranteed maximum output power will not be available over the full input/
output voltage range.
3. LR1117A only.
4. Output current must be limited to meet the absolute maximum ratings of the part.
3/9
LESHAN RADIO COMPANY, LTD.
LR1 1 1 7 A
Typical Performance Characteristics
1.5
1.4
0.10
∆I = 1A
0.05
0
1.3
1.2
1.1
T
= 0°C
1.0
0.9
0.8
0.7
0.6
0.5
0
J
-0.05
-0.10
T
= 25°C
J
T
= 125°C
J
-0.15
-0.20
0
0.2
0.4
0.6
0.8
1.0
-75 -50 -25
0
25 50 75 100 125150 175
OUTPUT CURRENT (A)
JUNCTION TEMPERATURE (°C)
Figure 2. Dropout Voltage vs. Output Current
Figure 3. Load Regulation vs. Temperature
1.260
1.255
1.250
1.245
1.240
1.235
1.230
1.225
1.220
1.215
1.210
3.70
VOUT SET WITH 1% RESISTORS
3.65
VOUT = 3.6V1
3.60
3.55
3.50
3.45
3.40
3.35
VOUT = 3.3V
3.30
3.25
3.20
Note:
1. LR1117A Only
-75 -50 -25
0
25 50 75 100 125150 175
-75 -50 -25
0
25 50 75 100 125150 175
JUNCTION TEMPERATURE (°C)
JUNCTION TEMPERATURE (°C)
Figure 4. Reference Voltage vs. Temperature
Figure 5. Output Voltage vs. Temperature
5
4
3
2
1
0
100
Note:
90
1. LR1117A Only
80
70
60
50
40
30
20
10
0
-75 -50 -25
0
25 50 75 100 125150 175
-75 -50 -25
0
25 50 75 100 125150 175
JUNCTION TEMPERATURE (°C)
JUNCTION TEMPERATURE (°C)
Figure 6. Minimum Load Current vs. Temperature
Figure 7. Adjust Pin Current vs. Temperature
4/9
LESHAN RADIO COMPANY, LTD.
LR1 1 1 7 A
Typical Performance Characteristics (continued)
2.0
1.75
1.5
90
80
70
60
50
40
30
1.25
(VIN - VOUT) = 3V
0.5 < VRIPPLE < 2V
20
10
0
I
OUT = 1A
1.0
-75 -50 -25
0
25 50 75 100 125150 175
10
100
1K
10K
100K
JUNCTION TEMPERATURE (°C)
FREQUENCY (Hz)
Figure 8. Short-Circuit Current vs. Temperature
Figure 9. Ripple Rejection vs. Frequency
10
5000
4000
3000
2000
VIN = 12V
10ma < I
< I
MAX
OUT
7.5
TO-252, TO-220
VIN = 5V
Region of Stability
(SOA)
5
Instability
region
SOT-223
2.5
1000
0
0
25
45
65
85
105
125
0
1
2
3
4
5
6
7
8
9
10
CASE TEMPERATURE (°C)
V
(V)
OUT
Figure 11. Stability Region (SOA) vs. ESR of the C
Figure 10. Maximum Power Dissipation
OUT
5/9
LESHAN RADIO COMPANY, LTD.
LR1 1 1 7 A
Mechanical Dimensions
4-Lead SOT-223 Package
Inches
Millimeters
Symbol
Notes
Min.
Max.
Min.
Max.
A
A1
B
c
—
—
.071
.181
.033
.090
.264
.148
.124
.041
.287
—
—
—
1.80
4.80
.840
2.29
6.71
3.71
3.15
1.04
7.29
—
.025
—
.640
—
D
E
e
.248
.130
.115
.033
.264
.012
—
6.30
3.30
2.95
.840
6.71
.310
—
F
H
I
10°
10°
J
10°
16°
10°
16°
K
L
.0008
10°
.0040
16°
.0203
10°
.1018
16°
M
N
.010
.014
.250
.360
D
e
K
A
E
H
N
J
I
M
L
B
A1
c
F
6/9
LESHAN RADIO COMPANY, LTD.
LR1 1 1 7 A
Mechanical Dimensions (continued)
3-Lead TO-220 Package
Inches
Millimeters
Symbol
Notes
Min.
Max.
Min.
Max.
A
.140
.015
.045
.014
.139
.560
.380
.090
.190
.045
.190
.040
3.56
.38
4.83
1.02
b
b1
c1
øP
D
1.14
.36
.070
.022
.161
1.78
.56
3.53
14.22
9.65
2.29
4.83
1.14
4.09
.650
.420
.110
.210
—
16.51
10.67
2.79
5.33
—
E
e
e1
e3
F
.020
.230
.080
.055
.270
.115
.51
1.40
6.87
2.92
H1
J1
L
5.94
2.04
.500
.580
12.70
14.73
L1
Q
α
.250 BSC
6.35 BSC
.100
.135
2.54
3.43
Notes:
3°
7°
3°
7°
1. Dimension c1 apply for lead finish.
H1
Q
L
b1
e3
e
e1
E
b
L1
E-PIN
øP
α (5X)
c1
A
J1
F
D
7/9
LESHAN RADIO COMPANY, LTD.
LR1 1 1 7 A
Mechanical Dimensions (continued)
3-Lead TO-252 Package
A
6.73
6.35
6.00 MIN
5.46
5.21
L3
4
6.50 MIN
D
6.25
1.02
0.84
C
3.00 MIN
2
1
3
1
3
1.14
0.78
2.30
1.40 MIN
(0.59)
0.89
4.80
2.29
0.54
4.57
E1
M
M
A
0.25
C
LAND PATTERN RECOMMENDATION
B
2.38
2.18
SEE
NOTE D
0.58
0.48
4
D1
10.41
9.40
SEE
DETAIL A
2
1
3
0.10
B
NOTES: UNLESS OTHERWISE SPECIFIED
0.51
GAGE PLANE
A) ALL DIMENSIONS ARE IN MILLIMETERS.
B) THIS PACKAGE CONFORMS TO JEDEC, TO-252,
ISSUE C. VARIATION AA & AB, DATED NOV. 1999.
0.61
0.48
(1.54)
C) DIMENSIONING AND TOLERANCING PER
10°
0°
ASME Y14.5–1994.
D) HEAT SINK TOP EDGE COULD BE IN CHAMFERED
CORNERS OR EDGE PROTRUSION.
1.78
1.40
E) DIMENSIONS L3, D, E1 & D1 TABLE:
0.127 MAX
SEATING PLANE
OPTION AA OPTION AB
L3 0.89 – 1.27 1.52 – 2.03
2.90
D
5.97 – 6.22 5.33 – 5.59
DETAIL A
E1 4.32 MIN
D1 5.21 MIN
3.81 MIN
4.57 MIN
(ROTATED –90°
SCALE 12X
8/9
LESHAN RADIO COMPANY, LTD.
LR1 1 1 7 A
Ordering Information
Product Number
LR1117ADX
Package
TO-252 in tape and reel
SOT-223 in tape and reel
TO-252 in tape and reel
SOT-223 in tape and reel
TO-252 in tape and reel
SOT-223 in tape and reel
TO-252
LR1117ASX
LR1117AD18X
LR1117AS18X
LR1117AD25X
LR1117AS25X
LR1117AD285
LR1117AS285
LR1117AD33X
LR1117AS33X
LR1117AT
SOT-223
TO-252 in tape and reel
SOT-223 in tape and reel
TO-220
LR1117AT18
LR1117AT25
LR1117AT33
LR1117AD5X
LR1117AS5X
TO-220
TO-220
TO-220
TO-252 in tape and reel
SOT-223 in tape and reel
9/9
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