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PDF LM138K Data sheet ( Hoja de datos )
| Número de pieza | LM138K | |
| Descripción | 5A Positive Adjustable Voltage Regulator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM138K (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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OBSOLETE:
FOR INFORMATION PURPOSES ONLY
Contact Linear Technology for Potential Replacement
Features
nn Guaranteed 1% Initial Tolerance
nn Guaranteed 0.3% Load Regulation
nn Guaranteed 5A Output Current
nn 100% Thermal Limit Burn-In
nn 12A Transient Output Current
Applications
nn High Power Linear Regulator
nn Battery Chargers
nn Power Driver
nn Constant-Current Regulator
Typical Application
Parallel Regulators for Higher Current*
LT338A
0.01Ω∗∗
VIN VIN VOUT
ADJ
5V
8A
LT350A
VIN VOUT
ADJ
0.016Ω**
121Ω
1%
365Ω
1%
138/338 TA01
*THIS CIRCUIT WILL NOT WORK WITH LM VERSION DEVICES
**CURRENT SHARING RESISTORS DEGRADE REGULATION TO 1%
LT138A/LT338A
LM138/LM338
5A Positive Adjustable
Voltage Regulator
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.
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.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Output Voltage Error
12
11
10
9
8
2% RESISTORS LM338
7
6
1% RESISTORS LM338
5 LT338A
4 2% RESISTORS
3 LT338A
2 1% RESISTORS
1
0
1 10 100
OUTPUT VOLTAGE (V)
138A/338A TA02
For more information www.linear.com/LT138A
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1 page  
Typical Performance Characteristics
LT138A/LT338A
LM138/LM338
Temperature Stability
1.270
1.260
1.250
1.240
Output Impedance
10 VIN = 15V
VOUT = 10V
1 IOUT = 500mA
0.1 CADJ = COUT = 0μF
0.01
0.001
CADJ = COUT = 10μF
1.230
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
138A/338A G04
0.0001
10
100 1k 10k 100k
FREQUENCY (Hz)
1M
138/338 G05
Ripple Rejection
100
CADJ = 10μF
80
CADJ = 0μF
60
40
20
VIN – VOUT = 5V
IOUT = 500mA
f = 120Hz
TJ = 25°C
0
0 5 10 15
20
25
OUTPUT VOLTAGE (V)
30 35
138A/338A G07
Ripple Rejection
100
80 CADJ = 10μF
60
CADJ = 0μF
40
20 VIN = 15V
VOUT = 10V
0 IOUT = 0.2A
10 100
1k 10k
FREQUENCY (Hz)
100k 1M
138A/338A G08
Current Limit
16 PEAK CURRENT LIMIT
DC CURRENT LIMIT
TCASE = 25°C
12 PRELOAD = 0A
PRELOAD = 5A
8
PRELOAD = 1A
4
0
0 10 20 30 40
INPUT-OUTPUT DIFFERENTIAL (V)
138A/338A G10
Current Limit
14
12
PRELOAD = 0A
10
PRELOAD = 5A
8
6
4
2
VVIONU=T
10V
= 5V
0 TCASE = 25°C
0.1 1
10
TIME (ms)
100
138A/338A G11
For more information www.linear.com/LT138A
Minimum Operating Current
5
4
TJ = 150°C
TJ = 25°C
3
2 TJ = –55°C
1
0
0 5 10 15 20 25 30 35 40
INPUT-OUTPUT DIFFERENTIAL (V)
138A/338A G06
Ripple Rejection
80
CADJ = 10μF
70
CADJ = 0μF
60
50 VIN = 15V
VOUT = 10V
f = 120Hz
40 TCASE = 25°C
0.1
1
OUTPUT CURRENT (A)
10
138/338 G09
Current Limit
14
12
PRELOAD CURRENT = 0
TCASE = 25°C
10
VIN – VOUT = 10V
8
6 VIN – VOUT = 15V
4 VIN – VOUT = 20V
2 VIN – VOUT = 30V
0
0.1
1 10
TIME (ms)
100
138A/338A G12
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5 Page 
LT138A/LT338A
LM138/LM338
Package Description
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
K Package
2-Lead TO-3 Metal Can
(Reference LTC DWG # 05-08-1310)
0.320 – 0.350
(8.13 – 8.89)
0.760 – 0.775
(19.30 – 19.69)
0.060 – 0.135
(1.524 – 3.429)
0.420 – 0.480
(10.67 – 12.19)
0.038 – 0.043
(0.965 – 1.09)
0.210 – 0.220
(5.33 – 5.59)
1.177 – 1.197
(29.90 – 30.40)
0.655 – 0.675
(16.64 – 17.15)
0.151 – 0.161
(3.86 – 4.09)
DIA, 2PLCS
0.425 – 0.435
(10.80 – 11.05)
0.067 – 0.077
(1.70 – 1.96)
0.167 – 0.177
(4.24 – 4.49)
R
0.490 – 0.510
(12.45 – 12.95)
R
K2 (TO-3) 1098
OBSOLETE PACKAGE
For more information www.linear.com/LT138A
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11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LM138K.PDF ] | |
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