LM338T - 5A +ve Adjustable Regulator (SER59H)


The LM338 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. 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 LM338 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 150mm 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 LM338 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.

Features Include:
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

Applications Include:
Adjustable power supplies
Constant current regulators
Battery chargers

We will endeavour to hold stock of all popular semi-conductor products, as well as maintain prices. However, please note that due to the volatility of pricing and availability of certain semi-conductor products, we have the right to amend prices or delete products from our database, without notice.

Add to Cart:

  • Model: SER59H
  • 28 Units in Stock at PLUMSTEAD SHOP
    40 Units in Stock at BELLVILLE SHOP

This product was added to our catalogue on Monday 01 May, 2006.

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