LM338P [Linear]
5A Positive Adjustable Voltage Regulator; 5A正，可调式稳压器
| 型号： | LM338P |
| 厂家： | 
Linear |
| 描述： | 5A Positive Adjustable Voltage Regulator |
| 文件： | 总12页 (文件大小：189K) |
| 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
U
FEATURES
DESCRIPTIO
■
Guaranteed 1% Initial Tolerance
The LT®138A series of adjustable regulators provide 5A
outputcurrentoveranoutputvoltagerangeof1.2Vto32V.
The internal voltage reference is trimmed to less than 1%,
enabling a very tight output voltage. In addition to excel-
lent line and load regulation, with full overload protection,
the LT138A incorporates new current limiting 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.
■
Guaranteed 0.3% Load Regulation
■
Guaranteed 5A Output Current
■
100% Thermal Limit Burn-In
■
12A Transient Output Current
U
APPLICATIO S
■
High Power Linear Regulator
■
Battery Chargers
■
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.
■
The graph below shows the significant improvement in
output voltage tolerance achieved by using the LT138A or
LT338A.
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
TYPICAL APPLICATIO
Parallel Regulators for Higher Current*
Output Voltage Error
12
11
10
LT338A
ADJ
0.01Ω**
5V
8A
V
IN
V
IN
V
OUT
9
2% RESISTORS
8
7
6
5
4
3
2
1
0
LM338
1% RESISTORS
LM338
LT350A
ADJ
0.016Ω**
LT338A
V
IN
V
OUT
121Ω
2% RESISTORS
1% RESISTORS
1%
LT338A
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
1
LT138A/LT338A
LM138/LM338
W W W
U
(Note 1)
ABSOLUTE AXI U RATI GS
Power Dissipation.............................. Internally Limited
Input-to-Output Voltage Differential........................ 35V
Operating Junction Temperature Range
Storage Temperature Range ................ –65°C to 150°C
Lead TemperaU ture (Soldering, 10 sec)................. 300°C
U U
PRECONDITIONI G
LT138A/LM138 ............................... –55°C to 150°C
LT338A/LM338 ................................... 0°C to 125°C
100% Thermal Limit Burn-In
W
U
/O
PACKAGE RDER I FOR ATIO
BOTTOM VIEW
ORDER
PART NUMBER
ORDER
PART NUMBER
V
IN
FRONT VIEW
2
1
3
2
1
V
V
OUT
IN
LT138AK
LT338AK
LM138K
LM338K
LM338P
CASE
IS OUTPUT
ADJ
ADJ
P PACKAGE
3-LEAD PLASTIC TO-3P
K PACKAGE
2-LEAD TO-3 METAL CAN
TJMAX = 125°C, θJA = 45°C/ W
TJMAX = 150°C, θJA = 35°C/ W, θJC = 1°C/ W (LT138A/LT138)
TJMAX = 125°C, θJA = 35°C/ W, θJC = 1°C/ W (LT338A/LT338)
Consult factory for Industrial grade parts.
The ● denotes specifications which apply over the full operating
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at TA = 25°C. (Note 2)
LT138A
TYP
LM138
TYP
SYMBOL
PARAMETER
CONDITIONS
= 10mA, T = 25°C
MIN
MAX
MIN
MAX
UNITS
V
Reference Voltage
I
1.238 1.250 1.262
1.225 1.250 1.270
V
V
REF
OUT
J
3V ≤ (V – V ) ≤ 35V,
●
●
1.19
1.24
1.29
IN
OUT
OUT
10mA ≤ I
≤ 5A, P ≤ 50W
∆V
OUT
Line Regulation
Load Regulation
3V ≤ (V – V ) ≤ 35V, (Note 3)
0.005 0.01
0.02
0.005 0.01
0.02
%/V
%/V
IN
OUT
∆V
0.04
0.04
IN
∆V
10mA ≤ I
≤ 5A, (Note 3)
OUT
OUT
OUT
≤ 5V
≥ 5V
∆I
V
V
5
0.1
15
0.3
5
0.1
15
0.3
mV
%
OUT
OUT
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
●
●
60
75
60
75
dB
dB
ADJ
ADJ
= 10µF
60
60
I
Adjust Pin Current
●
●
45
100
5
45
100
5
µA
µA
ADJ
∆I
Adjust Pin Current Change
10mA ≤ I
≤ 5A,
OUT
0.2
0.2
ADJ
3V ≤ (V – V ) ≤ 35V
IN
OUT
Minimum Load Current
Current Limit
(V – V ) = 35V
●
3.5
5
3.5
5
mA
IN
OUT
I
(V – V ) ≤ 10V
SC
IN
OUT
DC
●
●
5
6
8
12
5
6
8
12
A
A
0.5ms Peak
(V – V ) = 30V, T = 25°C
1
2
1
A
IN
OUT
J
2
LT138A/LT338A
LM138/LM338
The ● denotes specifications which apply over the full operating
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at TA = 25°C. (Note 2)
LT138A
TYP
LM138
TYP
SYMBOL
PARAMETER
CONDITIONS
MIN
MAX
MIN
MAX
UNITS
∆V
∆Temp
Temperature Stability
●
1
2
1
%
OUT
∆V
∆Time
Long-Term Stability
T = 125°C, 1000 Hours
0.3
1
1
0.3
1
1
%
OUT
A
e
n
RMS Output Noise (% of V
)
OUT
10Hz ≤ f ≤ 10kHz
0.001
0.003
%
θ
Thermal Resistance
Junction-to-Case
K Package
°C/W
JC
The ● denotes specifications which apply over the full operating temperature range,
otherwise specifications are at TA = 25°C. (Note 2)
LT338A
TYP
LM338
TYP
SYMBOL
PARAMETER
CONDITIONS
= 10mA
MIN
MAX
MIN
MAX
UNITS
V
REF
Reference Voltage
I
1.238 1.250 1.262
1.225 1.250 1.270
V
V
OUT
3V ≤ (V – V ) ≤ 35V,
●
●
1.19
1.24
1.29
IN
OUT
10mA ≤ I
≤ 5A, P ≤ 50W
OUT
∆V
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
OUT
∆V
IN
∆V
10mA ≤ I
≤ 5A, (Note 3)
OUT
OUT
OUT
≤ 5V
≥ 5V
∆I
V
V
5
0.1
15
0.3
5
0.1
25
0.5
mV
%
OUT
OUT
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
●
●
60
75
60
75
dB
dB
ADJ
ADJ
= 10µF
60
60
I
Adjust Pin Current
●
●
45
100
5
45
100
5
µA
µA
ADJ
∆I
Adjust Pin Current Change
10mA ≤ I
≤ 5A,
OUT
0.2
0.2
ADJ
OUT
3V ≤ (V – V ) ≤ 35V
IN
Minimum Load Current
Current Limit
(V – V ) = 35V
●
3.5
10
3.5
10
mA
IN
OUT
I
(V – V ) ≤ 10V
SC
IN
OUT
DC
●
●
5
6
8
12
5
6
8
12
A
A
0.5ms Peak
(V – V ) = 30V, T = 25°C
1
1
2
2
1
1
A
IN
OUT
J
∆V
∆Temp
Temperature Stability
Long-Term Stability
●
%
OUT
∆V
T = 125°C, 1000 Hours
0.3
1
0.3
1
1
%
OUT
A
∆Time
e
n
RMS Output Noise (% of V
)
OUT
10Hz ≤ f ≤ 10kHz
0.001
0.003
%
θ
Thermal Resistance
Junction-to-Case
K Package
1
°C/W
JC
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: Unless otherwise specified, these specifications apply:
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.
V
– V
= 5V and I
= 2.5A. These specifications are applicable for
IN
OUT
OUT
power dissipations up to 50W.
3
LT138A/LT338A
LM138/LM338
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Load Regulation
Dropout Voltage
Adjustment Current
65
60
55
50
45
40
35
30
0.2
0.1
4
3
V
V
= 15V
∆V
= 100mV
OUT
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
–0.3
–0.4
1
–75 –50 –25
0
25 50 75
100 125
150
–75
–25
25
TEMPERATURE (°C)
125
–75 –50 –25
0
25 50 75 100 125 150
75
TEMPERATURE (°C)
TEMPERATURE (°C)
138/338 G01
138/338 G02
138A/338A G03
Temperature Stability
Output Impedance
Minimum Operating Current
1.270
1.260
1.250
1.240
10
1
5
V
V
= 15V
IN
= 10V
OUT
OUT
I
= 500mA
4
3
2
1
0
T = 150°C
J
T = 25°C
C
= C
= 0µF
OUT
J
ADJ
0.1
T = –55°C
J
0.01
0.001
0.0001
C
= C
= 10µF
OUT
ADJ
1.230
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
10
100
1k
10k
100k
1M
0
20
25 30 35 40
INPUT-OUTPUT DIFFERENTIAL (V)
5
10 15
FREQUENCY (Hz)
138A/338A G04
138/338 G05
138A/338A G06
Ripple Rejection
Ripple Rejection
Ripple Rejection
100
80
60
40
20
0
80
100
80
60
40
20
0
C
= 10µF
ADJ
C
ADJ
= 10µF
= 0µF
70
60
50
40
C
= 10µF
ADJ
C
ADJ
C
= 0µF
ADJ
C
= 0µF
ADJ
V
– V
= 5V
IN
OUT
V
V
= 15V
IN
OUT
I
= 500mA
OUT
= 10V
V
V
I
= 15V
IN
OUT
f = 120Hz
f = 120Hz
= 25°C
= 10V
T
J
= 25°C
T
= 0.2A
CASE
OUT
0
5
10
15
20
25
30
35
0.1
1
10
10
100
1k
10k
100k
1M
OUTPUT CURRENT (A)
OUTPUT VOLTAGE (V)
FREQUENCY (Hz)
138A/338A G07
138/338 G09
138A/338A G08
4
LT138A/LT338A
LM138/LM338
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Current Limit
Current Limit
Current Limit
14
12
10
8
14
12
10
8
16
12
8
PEAK CURRENT LIMIT
DC CURRENT LIMIT
CASE
PRELOAD CURRENT = 0
CASE
T
= 25°C
T
= 25°C
PRELOAD = 0A
PRELOAD = 0A
V
V
– V
– V
= 10V
= 15V
IN
OUT
PRELOAD = 5A
PRELOAD = 5A
IN
OUT
6
6
V
V
– V
– V
= 20V
= 30V
IN
OUT
PRELOAD = 1A
4
4
4
V
V
CASE
= 10V
IN
IN
OUT
2
2
= 5V
OUT
T
= 25°C
0
0.1
0
0.1
0
20
INPUT-OUTPUT DIFFERENTIAL (V)
1
10
100
1
10
100
0
10
30
40
TIME (ms)
TIME (ms)
138A/338A G11
138A/338A G12
138A/338A G10
Line Transient Response
Load Transient Response
1.5
1.0
3
2
V
I
J
= 10V
OUT
OUT
= 50mA
C
ADJ
= 1µF
= 10µF
C
= 0
= 0
L
L
T = 25°C
C
C
ADJ
C
L
= 1µF
1
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
C
OUT
C
ADJ
= 0
= 0
= 10V
= 25°C
CASE
PRELOAD = 100mA
4
0.5
2
0
0
0
10
40
20
TIME (µs)
30
0
10
20
TIME (µs)
30
40
138A/338A G13
138A/338A G14
U
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APPLICATIONS INFORMATION
General
tolerance of ±4% which is dangerously close to the ±5%
supply tolerance required in many logic and analog sys-
tems. Further, even 1% resistors can drift 0.01%/°C, add-
ing additional error to the output voltage tolerance.
The LT138A develops a 1.25V reference voltage between
the output and the adjustable terminal (see Figure 1). By
placingaresistor, R1, betweenthesetwoterminals, acon-
stantcurrentiscausedtoflowthroughR1anddownthrough
R2 to set the overall output voltage. Normally this current
is the specified minimum load current of 5mA or 10mA.
Because IADJ is very small and constant when compared
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 accuracy
of VREF. Earlier adjustable regulators had a reference
LT338A
V
IN
V
OUT
V
V
OUT
IN
ADJ
V
R1
R2
REF
+
I
ADJ
50µA
138A/338A F01
R2
R1
V
= V
1 +
+ I • R2
ADJ
OUT
REF
(
)
Figure 1. Basic Adjustable Regulator
5
LT138A/LT338A
LM138/LM338
U
W U U
APPLICATIONS INFORMATION
For example, using 2% resistors and ±4% tolerance for
VREF, calculations will show that the expected range of a
5V regulator design would be 4.66V ≤ VOUT ≤ 5.36V or
approximately ±7%. If the same example were used for a
15Vregulator,theexpectedtolerancewouldbe±8%.With
these results most applications required some method of
trimming, usually a trim pot. This solution is both expen-
sive and not conductive to volume production.
(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 possi-
bility 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.
One of the enhancements of Linear Technology’s adjust-
able regulators over existing devices is the tightened
initial tolerance of VREF. This allows relatively inexpen-
sive 1% or 2% film resistors to be used for R1 and R2 to
set the output voltage within an acceptable tolerance.
Protection Diodes
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 capaci-
tor to improve ripple rejection.
With a guaranteed 1% reference, a 5V power supply
design, using ±2% resistors, would have a worst-case
manufacturingtoleranceof±4%. If1%resistorsareused,
the tolerance will drop to ±2.5%. A plot of the worst-case
outputvoltagetoleranceasafunctionofresistortolerance
is shown on the front page of this data sheet.
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.
For convenience, a table of standard 1% resistor values is
shown in Table 1.
Table 1. 0.5% and 1% Standard Resistance Values
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
V
OUT
IN
NOT
ADJ
R1
R2
NEEDED
+
C
C
OUT
100µF
ADJ
10µF
138A/338A F02
Figure 2
Load Regulation
Standard resistance values are obtained from the Decade Table by
Because the LT138A is a three-terminal device, it is not
possible to provide true remote load sensing. Load regu-
lation will be limited by the resistance of the wire connect-
ing 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 connec-
tion, with the bottom of the output divider returned to the
multiplying by multiples of 10. As an example, 1.21 can represent 1.21Ω,
12.1Ω, 121Ω, 1.21k etc.
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
6
LT138A/LT338A
LM138/LM338
U
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APPLICATIONS INFORMATION
R
P
negative side of the load. Although it may not be immedi-
ately obvious, best load regulation is obtained when the
top of the resistor 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 be-
tween the regulator and the load would be:
PARASITIC
LT338A
LINE RESISTANCE
V
V
OUT
V
IN
IN
ADJ
CONNECT
R1 TO CASE
R1
R
L
R2
R2 +R1
CONNECT
R2 TO LOAD
RP
,RP = ParasiticLineResistance
R1
138A/338A F03
Connected as shown, RP is not multiplied by the divider
ratio. RP is about 0.004Ω per foot using 16 gauge wire.
This translates to 4mV/ft at 1A load current, so it is
important to keep the positive lead between regulator and
load as short as possible, and use large wire or PC board
traces.
Figure 3. Connections for Best Load Regulation
U
TYPICAL APPLICATIONS
Improving Ripple Rejection
LT338A
V
IN
V
OUT
V
IN
5V
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
V
OUT
IN
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
(
)
7
LT138A/LT338A
LM138/LM338
U
TYPICAL APPLICATIONS
5V Regulator with Shutdown
LT338A
V
V
OUT
V
IN
5V
IN
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
IN
V
OUT
5V
ADJ
V
IN
–
2
3
7
25Ω
6
LM301A
R
L
1k
+
121Ω
1
8
5µF
4
100pF
365Ω
25Ω
RETURN
RETURN
138A/338A TA06
8
LT138A/LT338A
LM138/LM338
W
W
SCHE ATIC DIAGRA
LT138A/LT338A
9
LT138A/LT338A
LM138/LM338
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
K Package
2-Lead TO-3 Metal Can
(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
10
LT138A/LT338A
LM138/LM338
U
PACKAGE DESCRIPTION
Dimensions in inches (millimeters) unless otherwise noted.
P Package
3-Lead Plastic TO-3P (Similar to TO-247)
(LTC DWG # 05-08-1450)
0.560
0.187 – 0.207
(4.75 – 5.26)
(14.224)
0.620 – 0.64O
(15.75 – 16.26)
0.325
(8.255)
0.275
(6.985)
0.060 – 0.080
(1.52 – 2.03)
MOUNTING HOLE
0.115 – 0.145
(2.92 – 3.68)
DIA
18° – 22°
0.580
(14.732)
0.830 – 0.870
(21.08 – 22.10)
0.170 – 0.2OO
(4.32 – 5.08)
0.700
(17.780)
EJECTOR PIN MARKS
0.105 – 0.125
(2.67 – 3.18)
DIA
0.580 – 0.6OO
(14.73 – 15.24)
0.098
(2.489)
3° – 7°
0.170
(4.32)
MAX
0.124
(3.149)
0.780 – 0.800
(19.81 – 20.32)
0.042 – 0.052
(1.07 – 1.32)
0.215
(5.46)
BSC
0.087 – 0.102
(2.21 – 2.59)
BOTTOM VIEW OF TO-3P
HATCHED AREA IS SOLDER PLATED
COPPER HEAT SINK
0.020 – 0.040
(0.51 – 1.02)
P3 0996
0.074 – 0.084
(1.88 – 2.13)
0.113 – 0.123
(2.87 – 3.12)
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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
LT138A/LT338A
LM138/LM338
U
TYPICAL APPLICATIONS
Lamp Flasher
Automatic Light Control
LT338A
LT338A
15V
V
V
OUT
V
IN
V
OUT
IN
+
ADJ
ADJ
10µF
10µF
10µF
1µF
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
V
IN
OUT
ADJ
TTL OR
CMOS
10k
138A/338A TA10
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1084
5A Low Dropout
Operates to 30V Input
LT1580
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
For 1.2V to 3.3V Outputs from 5V
LT1581
LT1585/LT1587
7A/4.6A/3A Low Dropout Fast Transient Response Regulator
138afa LT/LT 1199 2K REV A • PRINTED IN THE USA
LINEAR TECHNOLOGY CORPORATION 1991
12 LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
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