Linear LT138A LT338A LM138 LM338 Data Handbook
Summary
The LT138A/LT338A series is a high-performance adjustable voltage regulator designed for demanding power applications requiring superior stability and reliability. This device guarantees stable output current up to 5A across a wide range of voltages while excelling at handling large transient load spikes. The technical manual provides comprehensive specifications, detailed electrical characteristics, thermal parameters, and typical application guidelines, making it an essential component for engineers designing circuits such as lighting controllers or high-power drivers who require precise, regulated voltage output.
Page 1 Text Content
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LT138A/LT338A LM138/LM338 5A Positive Adjustable Voltage Regulator
FEATURES DESCRIPTIO Guaranteed 1% Initial Tolerance The LT®138A series of adjustable regulators provide 5A Guaranteed 0.3% Load Regulation output current over an output voltage range of 1.2V to 32V. Guaranteed 5A Output Current The internal voltage reference is trimmed to less than 1%, 100% Thermal Limit Burn-In enabling a very tight output voltage. In addition to excel- 12A Transient Output Current 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
APPLICATIO S
short periods. Transient load currents of up to 12A can be High Power Linear Regulator supplied without limiting, eliminating the need for a large Battery Chargers output capacitor.
Power Driver
The LT138A is an improved version of the popular LM138
Constant-Current Regulator
with improved circuit design and advanced process tech-
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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.
TYPICAL APPLICATIO
Parallel Regulators for Higher Current* Output Voltage Error
LT338A
VINVIN VOUT
2% RESISTORS
LM338
1% RESISTORS
LT350A LM338
LT338A
VIN VOUT
ADJ 121Ω 2% RESISTORS 1% LT338A
1% RESISTORS
365Ω 1% 138/338 TA01
OUTPUT VOLTAGE (V)
THIS CIRCUIT WILL NOT WORK WITH LM VERSION DEVICES
138A/338A TA02
CURRENT SHARING RESISTORS DEGRADE REGULATION TO 1%
Page Summary Contents For Linear LT138A LT338A LM138 LM338 Data Handbook
Manual Details
| Brand | Linear |
|---|---|
| Pages | 12 |
| File Size | 188.63 KB |
| Published | June 06, 2026 |
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Frequently Asked Questions
What is the maximum transient load current this regulator can handle?
It can supply transient load currents of up to 12A without limiting.
Does this regulator require a large output capacitor compared to older models?
No, the new current limiting circuitry eliminates the need for a larger output capacitor when handling transient loads.
What is the required minimum input-to-output voltage difference?
The Input-to-Output Voltage Differential must be at least 3.5V.
Which operating range should I consider if my system needs flexibility in cold weather?
The LT138A/LM138 offers a precondition operating junction temperature range from -55°C to 150°C.