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Linear Technology Electronic Components Datasheet

LM138K Datasheet

5A Positive Adjustable Voltage Regulator

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LM138K pdf
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
138afd
1



Linear Technology Electronic Components Datasheet

LM138K Datasheet

5A Positive Adjustable Voltage Regulator

No Preview Available !

LM138K pdf
LT138A/LT339A
LM138/LM338
Absolute Maximum Ratings (Note 1)
Power Dissipation............................... Internally Limited
Input-to-Output Voltage Differential.......................... 35V
Operating Junction Temperature Range
LT138A/LM138.................................. – 55°C to 150°C
LT338A/LM338..................................... 0°C to 125°C
Storage Temperature Range.................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C
Preconditioning
100% Thermal Limit Burn-In
Pin Configuration
BOTTOM VIEW
VIN
2
1
CASE
IS OUTPUT
ADJ (GND*)
K PACKAGE
2-LEAD TO-3 METAL CAN
TJMAX = 150°C, θJA = 35°C/W, θJA = 1°C/W (LT138A/LT138)
TJMAX = 125°C, θJA = 35°C/W, θJA = 1°C/W (LT338A/LT338)
OBSOLETE PACKAGE
FRONT VIEW
3
2
1
P PACKAGE
3-LEAD PLASTIC TO-3P
TJMAX = 125°C, θJA = 45°C/W
OBSOLETE PACKAGE
VIN
VOUT
ADJ
138afd
2 For more information www.linear.com/LT138A



Linear Technology Electronic Components Datasheet

LM138K Datasheet

5A Positive Adjustable Voltage Regulator

No Preview Available !

LM138K pdf
LT138A/LT338A
LM138/LM338
E lectrical Characteristics The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 2)
SYMBOL PARAMETER
CONDITIONS
LT138A
MIN TYP MAX
LM138
MIN TYP MAX
VREF Reference Voltage
ΔVOUT
ΔVIN
ΔVOUT
ΔVOUT
Line Regulation
Load Regulation
Thermal Regulation
IOUT = 10mA, TJ = 25°C
3V ≤ (VIN – VOUT) ≤ 35V,
10mA ≤ IOUT ≤ 5A, P ≤ 50W
3V ≤ (VIN – VOUT) ≤ 35V, (Note 3)
10mA ≤ IOUT ≤ 5A, (Note 3)
VOUT ≤ 5V
VOUT ≥ 5V
VOUT ≤ 5V
VOUT ≥ 5V
20ms Pulse
l
l
l
l
1.238
1.225
1.250
1.250
0.005
0.02
5
0.1
20
0.3
0.002
1.262
1.270
1.119
1.24
0.01 0.005
0.04 0.02
15 5
0.3 0.1
30 20
0.6 0.3
0.01 0.002
1.29
0.01
0.04
15
0.3
30
0.6
0.01
IADJ
ΔIADJ
ISC
Ripple Rejection
Adjust Pin Current
Adjust Pin Current Change
Minimum Load Current
Current Limit
VOUT = 10V, f = 120Hz
CADJ = 0µF
CADJ = 10µF
10mA ≤ IOUT ≤ 5A,
3V ≤ (VIN – VOUT) ≤ 35V
(VIN – VOUT) = 35V
(VIN – VOUT) ≤ 10V
DC
0.5ms Peak
l
l 60
60
75
60
60 75
l 45 100
45 100
l 0.2 5
0.2 5
l 3.5 5
3.5 5
l5
l6
8
12
58
6 12
ΔVOUT
ΔTemp
Temperature Stability
(VIN – VOUT) = 30V, TJ = 25ºC
l
12
12
1
1
ΔVOUT
ΔTime
Long-Term Stability
TA = 125ºC, 1000 Hours
0.3 1
0.3 1
en RMS Output Noise (% of VOUT) 10HZ ≤ f ≤ 10kHz
θJC Thermal Resistance
Junction-to-Case
K Package
0.001
1
0.003
1
UNITS
V
V
%/V
%/V
mV
%
mV
%
%/W
dB
dB
µA
µA
mA
A
A
A
%
%
%
ºC/W
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
SYMBOL PARAMETER
CONDITIONS
LT138A
LM138
MIN TYP MAX MIN TYP MAX UNITS
VREF Reference Voltage
ΔVOUT
ΔVIN
ΔVOUT
ΔVOUT
Line Regulation
Load Regulation
Thermal Regulation
IOUT = 10mA
1.238 1.250 1.262
3V ≤ (VIN – VOUT) ≤ 35V,
10mA ≤ IOUT ≤ 5A, P ≤ 50W
l 1.225 1.250 1.270 1.19 1.24 1.29
3V ≤ (VIN – VOUT) ≤ 35V, (Note 3)
l
0.005 0.01
0.02 0.04
0.005 0.03
0.02 0.06
10mA ≤ IOUT ≤ 5A, (Note 3)
VOUT ≤ 5V
VOUT ≥ 5V
VOUT ≤ 5V
VOUT ≥ 5V
20ms Pulse
l
l
5
0.1
20
0.3
0.002
15
0.3
30
0.6
0.02
5
0.1
20
0.3
0.002
25
0.5
50
1
0.02
V
V
%/V
%/V
mV
%
mV
%
%/W
For more information www.linear.com/LT138A
138afd
3




Part Number LM138K
Description 5A Positive Adjustable Voltage Regulator
Maker Linear Technology
Total Page 14 Pages
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