LM338P#PBF [Linear]
IC VREG 1.2 V-32 V ADJUSTABLE POSITIVE REGULATOR, PSFM3, LEAD FREE, PLASTIC, TO-247, TO-3P, 3 PIN, Adjustable Positive Single Output Standard Regulator;
| 型号： | LM338P#PBF |
| 厂家： | 
Linear |
| 描述： | IC VREG 1.2 V-32 V ADJUSTABLE POSITIVE REGULATOR, PSFM3, LEAD FREE, PLASTIC, TO-247, TO-3P, 3 PIN, Adjustable Positive Single Output Standard Regulator 局域网 输出元件 调节器 |
| 文件： | 总12页 (文件大小：150K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT138A/LT338A
LM138/LM338
5A Positive Adjustable
Voltage Regulator
FEATURES
DESCRIPTION
The LT®138A series of adjustable regulators provide 5A
output current over an output voltage range of 1.2V to
32V. The internal voltage reference is trimmed to less
than 1%, enabling a very tight output voltage. In addition
to excellent line and load regulation, with full overload
protection, the LT138A incorporates new current limit-
ing circuitry allowing large transient load currents to be
handled for short periods. Transient load currents of up
to 12A can be supplied without limiting, eliminating the
need for a large output capacitor.
n
Guaranteed 1% Initial Tolerance
n
Guaranteed 0.3% Load Regulation
n
Guaranteed 5A Output Current
n
100% Thermal Limit Burn-In
n
12A Transient Output Current
APPLICATIONS
n
High Power Linear Regulator
n
Battery Chargers
n
Power Driver
Constant-Current Regulator
The LT138A is an improved version of the popular LM138
with improved circuit design and advanced process tech-
niques to provide superior performance and reliability.
n
The graph below shows the significant improvement in
output voltage tolerance achieved by using the LT138A
or LT338A.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Parallel Regulators for Higher Current*
Output Voltage Error
12
11
10
LT338A
0.01Ω∗∗
5V
8A
V
IN
V
IN
V
OUT
9
ADJ
2% RESISTORS
8
7
6
5
4
3
2
1
0
LM338
1% RESISTORS
LM338
LT338A
LT350A
ADJ
0.016Ω**
V
V
OUT
IN
2% RESISTORS
1% RESISTORS
121Ω
LT338A
1%
365Ω
1%
1
10
100
138/338 TA01
OUTPUT VOLTAGE (V)
*THIS CIRCUIT WILL NOT WORK WITH LM VERSION DEVICES
**CURRENT SHARING RESISTORS DEGRADE REGULATION TO 1%
138A/338A TA02
138afc
1
LT138A/LT339A
LM138/LM338
(Note 1)
ABSOLUTE MAXIMUM RATINGS
Storage Temperature Range.................. –65°C to 150°C
Power Dissipation.............................. Internally Limited
Input-to-Output Voltage Differential........................ 35V
Operating Junction Temperature Range
Lead Temperature (Soldering, 10 sec) ..................300°C
PRECONDITIONING
LT138A/LM138 ................................ –55°C to 150°C
LT338A/LM338 ..................................... 0°C to 125°C
100% Thermal Limit Burn-In
PIN CONFIGURATION
BOTTOM VIEW
V
IN
FRONT VIEW
2
1
CASE
IS OUTPUT
3
2
1
V
V
IN
OUT
ADJ
ADJ (GND*)
K PACKAGE
P PACKAGE
2-LEAD TO-3 METAL CAN
3-LEAD PLASTIC TO-3P
T
JMAX
T
JMAX
= 150°C, θ = 35°C/W, θ = 1°C/W (LT138A/LT138)
JA JA
T
= 125°C, θ = 45°C/W
JMAX
JA
= 125°C, θ = 35°C/W, θ = 1°C/W (LT338A/LT338)
JA
JA
OBSOLETE PACKAGE
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
LM338P#TRPBF
TAPE AND REEL
LM338P#TR
PART MARKING
LM338P
PACKAGE DESCRIPTION
3-Lead Plastic TO-3P
PACKAGE DESCRIPTION
3-Lead Plastic TO-3P
TEMPERATURE RANGE
0°C to 125°C
LM338P#PBF
LEAD BASED FINISH
LM338P
PART MARKING
LM338P
TEMPERATURE RANGE
0°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
138afc
2
LT138A/LT338A
LM138/LM338
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 2)
LT138A
TYP
LM138
TYP
SYMBOL
PARAMETER
CONDITIONS
= 10mA, T = 25°C
MIN
1.238
1.225
MAX
1.262
1.270
MIN
MAX UNITS
V
Reference Voltage
I
1.250
1.250
V
REF
OUT
J
l
l
3V ≤ (V – V ) ≤ 35V,
1.119
1.24
1.29
V
IN
OUT
OUT
10mA ≤ I
≤ 5A, P ≤ 50W
ΔV
Line Regulation
Load Regulation
3V ≤ (V – V ) ≤ 35V, (Note 3)
0.005
0.02
0.01
0.04
0.005
0.02
0.01
0.04
%/V
%/V
OUT
IN
IN
OUT
ΔV
ΔV
10mA ≤ I
≤ 5A, (Note 3)
OUT
OUT
OUT
≤ 5V
≥ 5V
ΔV
V
V
5
0.1
15
0.3
5
0.1
15
0.3
mV
%
OUT
OUT
l
l
V
OUT
V
OUT
≤ 5V
≥ 5V
20
0.3
30
0.6
20
0.3
30
0.6
mV
%
Thermal Regulation
Ripple Rejection
20ms Pulse
0.002
0.01
0.002
0.01
%/W
V
= 10V, f = 120Hz
= 0μF
OUT
C
C
l
l
60
75
60
75
dB
dB
ADJ
ADJ
= 10μF
60
60
l
l
I
Adjust Pin Current
45
100
5
45
100
5
μA
μA
ADJ
ΔI
Adjust Pin Current Change
10mA ≤ I
≤ 5A,
OUT
0.2
0.2
ADJ
OUT
3V ≤ (V – V ) ≤ 35V
IN
l
Minimum Load Current
Current Limit
(V – V ) = 35V
3.5
5
3.5
5
mA
IN
OUT
I
(V – V ) ≤ 10V
IN OUT
SC
l
l
DC
0.5ms Peak
5
6
8
12
5
6
8
12
A
A
(V – V ) = 30V, T = 25ºC
1
1
2
2
1
1
A
IN
OUT
J
l
ΔV
Temperature Stability
Long-Term Stability
%
OUT
ΔTemp
ΔV
ΔTime
T = 125ºC, 1000 Hours
0.3
1
0.3
1
1
%
OUT
A
e
n
RMS Output Noise (% of V
)
10HZ ≤ f ≤ 10kHz
K Package
0.001
0.003
%
OUT
θ
JC
Thermal Resistance
Junction-to-Case
1
ºC/W
The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
LT138A
TYP
LM138
TYP
SYMBOL
PARAMETER
CONDITIONS
= 10mA
MIN
1.238
1.225
MAX
1.262
1.270
MIN
MAX UNITS
V
Reference Voltage
I
1.250
1.250
V
REF
OUT
l
l
3V ≤ (V – V ) ≤ 35V,
1.19
1.24
1.29
V
IN
OUT
10mA ≤ I
≤ 5A, P ≤ 50W
OUT
ΔV
Line Regulation
Load Regulation
3V ≤ (V – V ) ≤ 35V, (Note 3)
0.005
0.02
0.01
0.04
0.005
0.02
0.03
0.06
%/V
%/V
OUT
IN
IN
OUT
ΔV
ΔV
10mA ≤ I
≤ 5A, (Note 3)
OUT
OUT
OUT
≤ 5V
≥ 5V
ΔV
V
V
5
0.1
15
0.3
5
0.1
25
0.5
mV
%
OUT
OUT
l
l
V
OUT
V
OUT
≤ 5V
≥ 5V
20
0.3
30
0.6
20
0.3
50
1
mV
%
Thermal Regulation
Ripple Rejection
20ms Pulse
0.002
0.02
0.002
0.02
%/W
V
= 10V, f = 120Hz
= 0μF
OUT
C
C
l
l
60
75
60
75
dB
dB
ADJ
ADJ
= 10μF
60
60
138afc
3
LT138A/LT339A
LM138/LM338
ELECTRICAL CHARACTERISTICS
LT138A
TYP
LM138
TYP
SYMBOL
PARAMETER
CONDITIONS
MIN
MAX
100
5
MIN
MAX UNITS
l
l
I
Adjust Pin Current
Adjust Pin Current Change
45
45
100
5
μA
μA
ADJ
ΔI
10mA ≤ I
≤ 5A,
OUT
0.2
0.2
ADJ
OUT
3V ≤ (V – V ) ≤ 35V
IN
l
Minimum Load Current
Current Limit
(V – V ) = 35V
3.5
10
3.5
10
mA
IN
OUT
I
(V – V ) ≤ 10V
IN OUT
SC
l
l
DC
0.5ms Peak
5
6
8
12
5
6
8
12
A
A
(V – V ) = 30V, T = 25ºC
1
1
2
2
1
1
A
IN
OUT
J
l
ΔV
Temperature Stability
Long-Term Stability
%
OUT
ΔTemp
ΔV
ΔTime
T = 125ºC, 1000 Hours
0.3
1
0.3
1
1
%
OUT
A
e
n
RMS Output Noise (% of V
)
10HZ ≤ f ≤ 10kHz
K Package
0.001
0.003
%
OUT
θ
Thermal Resistance
Junction-to-Case
1
ºC/W
JC
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 3: 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.
Note 2: Unless otherwise specified, these specifications apply: V – V
IN
OUT
= 5V and I
= 2.5A. These specifications are applicable for power
OUT
dissipations up to 50W.
TYPICAL PERFORMANCE CHARACTERSITICS
Load Regulation
Dropout Voltage
Adjustment Current
65
60
55
50
45
40
35
30
0.2
0.1
4
3
V
V
= 15V
ΔV
OUT
= 100mV
IN
OUT
= 10V
PRELOAD = 50mA
0
I
I
= 3A
= 5A
OUT
OUT
I
= 5A
OUT
–0.1
–0.2
I
= 3A
OUT
2
I
= 1A
OUT
0
–0.3
–0.4
1
–75 –50 –25
0
25 50 75 100 125 150
–75
–25
25
TEMPERATURE (°C)
125
75
–75 –50 –25
25 50 75 100 125 150
TEMPERATURE (°C)
TEMPERATURE (°C)
138/338 G01
138A/338A G03
138/338 G02
138afc
4
LT138A/LT338A
LM138/LM338
TYPICAL PERFORMANCE CHARACTERISTICS
Temperature Stability
Output Impedance
Minimum Operating Current
10
1
5
4
3
2
1
0
1.270
1.260
1.250
1.240
V
V
= 15V
IN
= 10V
OUT
OUT
I
= 500mA
T
= 150°C
J
T = 25°C
J
C
= C
= 0μF
OUT
ADJ
0.1
T
J
= –55°C
0.01
0.001
0.0001
C
= C
= 10μF
OUT
ADJ
1.230
10
100
1k
10k
100k
1M
0
5
10 15
20
25 30 35 40
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
FREQUENCY (Hz)
INPUT-OUTPUT DIFFERENTIAL (V)
138/338 G05
138A/338A G06
138A/338A G04
Ripple Rejection
Ripple Rejection
Ripple Rejection
100
80
60
40
20
0
80
70
60
50
40
100
80
60
40
20
0
C
= 10μF
ADJ
C
= 10μF
= 0μF
ADJ
C
= 10μF
ADJ
C
ADJ
C
= 0μF
ADJ
C
ADJ
= 0μF
V
I
– V
= 5V
OUT
V
V
= 15V
OUT
f = 120Hz
IN
IN
= 500mA
= 10V
OUT
V
V
I
= 15V
IN
OUT
f = 120Hz
= 10V
T
= 25°C
T
= 25°C
J
= 0.2A
CASE
OUT
0.1
1
10
0
5
10
15
20
25
30
35
10
100
1k
10k
100k
1M
OUTPUT CURRENT (A)
OUTPUT VOLTAGE (V)
FREQUENCY (Hz)
138/338 G09
138A/338A G07
138A/338A G08
Current Limit
Current Limit
Current Limit
14
12
10
8
14
12
10
8
16
12
8
PRELOAD CURRENT = 0
PEAK CURRENT LIMIT
DC CURRENT LIMIT
CASE
T
= 25°C
CASE
T
= 25°C
PRELOAD = 0A
PRELOAD = 0A
V
V
– V
– V
= 10V
= 15V
IN
IN
OUT
PRELOAD = 5A
PRELOAD = 5A
OUT
6
6
V
V
– V
– V
= 20V
= 30V
IN
IN
OUT
PRELOAD = 1A
4
4
4
V
V
CASE
= 10V
IN
OUT
2
2
= 5V
OUT
T
= 25°C
0
0.1
0
0.1
0
1
10
100
1
10
100
20
INPUT-OUTPUT DIFFERENTIAL (V)
0
10
30
40
TIME (ms)
TIME (ms)
138A/338A G12
138A/338A G11
138A/338A G10
138afc
5
LT138A/LT339A
LM138/LM338
TYPICAL PERFORMANCE CHARACTERISTICS
Line Transient Response
Load Transient Response
3
2
1.5
1.0
V
I
J
= 10V
OUT
OUT
= 50mA
C
L
= 1μF
= 10μF
C
= 0
= 0
L
T
= 25°C
C
C
ADJ
ADJ
1
C
L
= 1μF
L
0.5
C
= 10μF
0
0
–1
–2
–3
6
–0.5
–1.0
–1.5
1.0
V
V
T
= 15V
IN
OUT
= 10V
C
C
= 0
= 0
OUT
ADJ
= 25°C
CASE
PRELOAD = 100mA
4
0.5
2
0
0
0
10
20
TIME (μs)
30
40
0
10
40
20
TIME (μs)
30
138A/338A G14
138A/338A G13
APPLICATIONS INFORMATION
General
For example, using 2% resistors and 4% tolerance for
, calculations will show that the expected range of a
V
REF
TheLT138Adevelopsa1.25Vreferencevoltagebetweenthe
output and the adjustable terminal (see Figure 1). By plac-
ing a resistor, R1, between these two terminals, a constant
current is caused to flow through R1 and down through
R2 to set the overall output voltage. Normally this current
is the specified minimum load current of 5mA or 10mA.
5V regulator design would be 4.66V ≤ V
≤ 5.36V or
OUT
approximately 7%. If the same example were used for a
15V regulator, the expected tolerance would be 8%. With
these results most applications required some method of
trimming,usuallyatrimpot.Thissolutionisbothexpensive
and not conductive to volume production.
Because I
is very small and constant when compared
ADJ
withthecurrentthroughR1,itrepresentsasmallerrorand
can usually be ignored. It is easily seen from the output
voltage equation, that even if the resistors were of exact
value, the accuracy of the output is limited by the accu-
One of the enhancements of Linear Technology’s adjust-
ableregulatorsoverexistingdevicesisthetightenedinitial
tolerance of V . This allows relatively inexpensive 1%
REF
or 2% film resistors to be used for R1 and R2 to set the
output voltage within an acceptable tolerance.
racy of V . Earlier adjustable regulators had a reference
REF
tolerance of 4% which is dangerously close to the 5%
supply tolerance required in many logic and analog sys-
tems.Further,even1%resistorscandrift0.01%/°C,adding
additional error to the output voltage tolerance.
With a guaranteed 1% reference, a 5V power supply
design, using 2% resistors, would have a worst-case
manufacturing tolerance of 4%. If 1% resistors are used,
the tolerance will drop to 2.5%. A plot of the worst-case
outputvoltagetoleranceasafunctionofresistortolerance
is shown on the front page of this data sheet.
LT338A
V
I
V
OUT
V
IN
V
OUT
IN
ADJ
For convenience, a table of standard 1% resistor values
is shown in Table 1.
V
REF
R1
R2
+
ADJ
50μA
138A/338A F01
R2
R1
V
OUT
= V
1 +
+ I • R2
ADJ
REF
(
)
Figure 1. Basic Adjustable Regulator
138afc
6
LT138A/LT338A
LM138/LM338
APPLICATIONS INFORMATION
Table 1. 0.5% and 1% Standard Resistance Values
If a very large output capacitor is used, such as a 100μF
shown in Figure 2, the regulator could be damaged or
destroyed if the input is accidentally shorted to ground
or crowbarred, due to the output capacitor discharging
into the output terminal of the regulator. To prevent this, a
diode D1 as shown, is recommended to safely discharge
the capacitor.
1.00
1.02
1.05
1.07
1.10
1.13
1.15
1.18
1.21
1.24
1.27
1.30
1.33
1.37
1.40
1.43
1.47
1.50
1.54
1.58
1.62
1.65
1.69
1.74
1.78
1.82
1.87
1.91
1.96
2.00
2.05
2.10
2.15
2.21
2.26
2.32
2.37
2.43
2.49
2.55
2.61
2.67
2.74
2.80
2.87
2.94
3.01
3.09
3.16
3.24
3.32
3.40
3.48
3.57
3.65
3.74
3.83
3.92
4.02
4.12
4.22
4.32
4.42
4.53
4.64
4.75
4.87
4.99
5.11
5.23
5.36
5.49
5.62
5.76
5.90
6.04
6.19
6.34
6.49
6.65
6.81
6.98
7.15
7.32
7.50
7.68
7.87
8.06
8.25
8.45
8.66
8.87
9.09
9.31
9.53
9.76
D1
1N4002
LT338A
V
IN
V
OUT
V
IN
V
OUT
NOT
ADJ
R1
R2
NEEDED
+
C
C
OUT
100μF
ADJ
10μF
138A/338A F02
Figure 2
Standard resistance values are obtained from the Decade Table by
multiplying by multiples of 10. As an example, 1.21 can represent
1.21Ω, 12.1Ω, 121Ω, 1.21k etc.
Load Regulation
Because the LT138A is a three-terminal device, it is not
possibletoprovidetrueremoteloadsensing.Loadregula-
tion will be limited by the resistance of the wire connecting
the regulator to the load. The data sheet specification for
load regulation is measured at the bottom of the package.
Negative side sensing is a true Kelvin connection, with the
bottom of the output divider returned to the negative side
of the load. Although it may not be immediately obvious,
best load regulation is obtained when the top of the resis-
tor divider, R1, is connected directly to the case not to the
load. This is illustrated in Figure 3. If R1 were connected
to the load, the effective resistance between the regulator
and the load would be:
Bypass Capacitors
Input bypassing using a 1μF tantalum or 25μf electrolytic
is recommended when the input filter capacitors are more
than 5 inches from the device. Improved ripple rejection
(80dB) can be accomplished by adding a 10μF capacitor
from the ADJ pin to ground. Increasing the size of the
capacitor to 20μF will help ripple rejection at low output
voltage since the reactance of this capacitor should be
small compared to the voltage setting resistor, R2. For
improved AC transient response and to prevent the pos-
sibility of oscillation due to unknown reactive load, a 1μF
capacitor is also recommended at the output. Because of
their low impedance at high frequencies, the best type of
capacitor to use is solid tantalum.
R2+R1
ꢀ
ꢃ
R
,R = Parasitic Line Resistance
P
ꢂ
ꢅ
P ꢁ
ꢄ
R1
Connected as shown, R is not multiplied by the divider
P
Protection Diodes
ratio.R isabout0.004Ωperfootusing16gaugewire.This
P
The LT138A/LT338A do not require a protection diode
from the adjustment terminal to the output (see Figure
2). Improved internal circuitry eliminates the need for
this diode when the adjustment pin is bypassed with a
capacitor to improve ripple rejection.
translatesto4mV/ftat1Aloadcurrent, soitisimportantto
keep the positive lead between regulator and load as short
as possible, and use large wire or PC board traces.
138afc
7
LT138A/LT339A
LM138/LM338
APPLICATIONS INFORMATION
R
P
PARASITIC
LINE RESISTANCE
LT338A
V
IN
V
OUT
V
IN
ADJ
CONNECT
R1 TO CASE
R1
R
L
R2
CONNECT
R2 TO LOAD
138A/338A F03
Figure 3. Connections for Best Load Regulation
TYPICAL APPLICATIONS
Improving Ripple Rejection
LT338A
V
IN
V
OUT
V
5V
IN
R1
121Ω
1%
+
ADJ
1μF
R2
365Ω
1%
+
C *
L
10μF
138A/338A TA03
*C1 IMPROVES RIPPLE REJECTION, X
C
SHOULD BE SMALL COMPARED TO R2
1.2V to 25V Adjustable Regulator
LT338A
†
V
IN
V
OUT
V
IN
V
OUT
R1
240Ω
ADJ
+
+
C1*
1μF
R2
5k
C2**
1μF
138A/338A TA04
*NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS
**OPTIONAL, IMPROVES TRANSIENT RESPONSE
R2
R1
†V
= 1.25V 1 +
OUT
(
)
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8
LT138A/LT338A
LM138/LM338
TYPICAL APPLICATIONS
5V Regulator with Shutdown
LT338A
V
IN
V
OUT
V
IN
5V
121Ω
1%
+
ADJ
1μF
1k
TTL
2N3904
365Ω
1%
1k
138A/338A TA05
Temperature Compensated Lead Acid Battery Charger
LT338A
3A
V
IN
V
OUT
243Ω
1%
ADJ
10k
50Ω
2N3906
12V
2k
50k
138A/338A TA07
Remote Sensing
R
P
(MAX DROP
300mV)
LT338A
V
OUT
V
IN
V
V
OUT
IN
5V
ADJ
V
IN
–
2
3
7
25Ω
6
LM301A
R
1k
L
+
121Ω
365Ω
1
8
5μF
4
100pF
25Ω
RETURN
RETURN
138A/338A TA06
138afc
9
LT138A/LT339A
LM138/LM338
SCHEMATIC DIAGRAM LT138A/LT338A
138afc
10
LT138A/LT338A
LM138/LM338
PACKAGE DESCRIPTION
K Package
2-Lead TO-3 Metal Can
(Reference LTC DWG # 05-08-1310)
0.760 – 0.775
(19.30 – 19.69)
0.320 – 0.350
(8.13 – 8.89)
0.060 – 0.135
(1.524 – 3.429)
0.420 – 0.480
(10.67 – 12.19)
0.038 – 0.043
(0.965 – 1.09)
1.177 – 1.197
(29.90 – 30.40)
0.655 – 0.675
(16.64 – 17.15)
0.210 – 0.220
(5.33 – 5.59)
0.151 – 0.161
(3.86 – 4.09)
DIA, 2PLCS
0.167 – 0.177
(4.24 – 4.49)
R
0.425 – 0.435
(10.80 – 11.05)
0.067 – 0.077
(1.70 – 1.96)
0.490 – 0.510
(12.45 – 12.95)
R
K2 (TO-3) 1098
OBSOLETE PACKAGE
P Package
3-Lead Plastic TO-3P (Similar to TO-247)
(Reference LTC DWG # 05-08-1450)
.560
.187 – .207
(4.75 – 5.26)
(14.224)
.620 – .64O
(15.75 – 16.26)
.325
(8.255)
.275
(6.985)
.060 – .080
(1.52 – 2.03)
MOUNTING HOLE
18° – 22°
.115 – .145
(2.92 – 3.68)
DIA
.580
(14.732)
.830 – .870
.170 – .2OO
(21.08 – 22.10)
(4.32 – 5.08)
.700
(17.780)
EJECTOR PIN MARKS
.105 – .125
.580 – .6OO
(14.73 – 15.24)
(2.67 – 3.18)
DIA
.098
(2.489)
3° – 7°
.170
(4.32)
MAX
.124
(3.149)
.780 – .800
(19.81 – 20.32)
.042 – .052
(1.07 – 1.32)
.215
(5.46)
BSC
.087 – .102
(2.21 – 2.59)
BOTTOM VIEW OF TO-3P
HATCHED AREA IS SOLDER PLATED
COPPER HEAT SINK
.020 – .040
(0.51 – 1.02)
P3 0801
.074 – .084
(1.88 – 2.13)
.113 – .123
(2.87 – 3.12)
138afc
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
LT138A/LT339A
LM138/LM338
TYPICAL APPLICATION
Lamp Flasher
Automatic Light Control
LT338A
LT338A
15V
V
V
OUT
IN
V
IN
V
OUT
+
ADJ
10μF
10μF
10μF
1μF
ADJ
1.2k
12V
12k
12k
12k
OFF
1k
138A/338A TA09
2N3904
138A/338A TA08
Protected High Current Lamp Driver
15V
12V
5A
LT338A
V
OUT
V
IN
ADJ
TTL OR
CMOS
10k
138A/338A TA10
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1083/LT1084/LT1085 3A/5A/7.5A Low Dropout Regulators
Fixed Outputs, V Up to 30V
IN
LT1580
LT1581
7A Fast Transient Response Regulator with 0.7V Dropout
10A Fast Transient Response Regulator
For 3.3V to 2.xxV Applications
For 3.3V to 2.xxV Applications
LT1584/LT1585/LT1587 7A/4.6A/3A Low Dropout Fast Transient Response Regulator For 1.2V to 3.3V Outputs from 5V
LT1764
3A Fast Transient Response Regulator
Dropout Voltage 340mV, Low Noise: 40μV
RMS
138afc
LT 0907 REV C • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
12
●
●
© LINEAR TECHNOLOGY CORPORATION 1991
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
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