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Part Number: LM338
Description: The LM138 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 5A over a 1....
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LM338
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DataSheet
General Description
LM338 General Description
The LM138 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 5A over a 1.2V to 32V output range. They are exceptionally easy to use and require only 2 resistors to set the output voltage. Careful circuit design has resulted in outstanding load and line regulation-comparable to many commercial power supplies. The LM138 family is supplied in a standard 3-lead transistor package.
A unique feature of the LM138 family is time-dependent current limiting. The current limit circuitry allows peak currents of up to 12A to be drawn from the regulator for short periods of time. This allows the LM138 to be used with heavy transient loads and speeds start-up under full-load conditions. Under sustained loading conditions, the current limit decreases to a safe value protecting the regulator. Also included on the chip are thermal overload protection and safe area protection for the power transistor. Overload protection remains functional even if the adjustment pin is accidentally disconnected.
Normally, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors in which case an input bypass is needed. An output capacitor can be added to improve transient response, while bypassing the adjustment pin will increase the regulator's ripple rejection.
Besides replacing fixed regulators or discrete designs, the LM138 is useful in a wide variety of other applications. Since the regulator is "floating" and sees only the input-to-output differential voltage, supplies of several hundred volts can be regulated as long as the maximum input to output differential is not exceeded, i.e., do not short-circuit output to ground. The part numbers in the LM138 series which have a K suffix are packaged in a standard Steel TO-3 package, while those with a T suffix are packaged in a TO-220 plastic package. The LM138 is rated for −55 TJ +150°C, and the LM338 is rated for 0 TJ +125.
LM338 Maximum Ratings
Power Dissipation Internally limited
Input/Output Voltage Differential +40V, −0.3V
Storage Temperature −65 to +150
Lead Temperature
Metal Package (Soldering, 10 seconds) 300
Plastic Package (Soldering, 4 seconds) 260
ESD Tolerance TBD
Input/Output Voltage Differential +40V, −0.3V
Storage Temperature −65 to +150
Lead Temperature
Metal Package (Soldering, 10 seconds) 300
Plastic Package (Soldering, 4 seconds) 260
ESD Tolerance TBD
LM338 Features
Guaranteed 7A peak output current
Guaranteed 5A output current
Adjustable output down to 1.2V
Guaranteed thermal regulation
Current limit constant with temperature
P+ Product Enhancement tested
Output is short-circuit protected
Guaranteed 5A output current
Adjustable output down to 1.2V
Guaranteed thermal regulation
Current limit constant with temperature
P+ Product Enhancement tested
Output is short-circuit protected
LM338 Typical Application
Adjustable power supplies
Constant current regulators
Battery chargers
Constant current regulators
Battery chargers
LM338
PDF/DataSheet Download
- Datasheet: LM338
- File Size: 190717 KB
- Manufacturer: STMicro
- Click here to Download
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LM338 Relative Products
LM337TG
IC REG NEG 1.5A ADJ TO220AB
LM337T/NOPB
IC REGULATOR NEG ADJ TO-220
LM337T
IC REG NEG 1.5A ADJ TO220AB
LM337SP
IC VOLT REG NEG 1.5A ADJ TO-220
LM337M
LM337LZ/NOPB
IC REGULATOR NEG ADJ TO-92
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