Because the regulator is floating and receives 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 do not short-circuit output to ground. An output capacitor can be added to improve transient response, while bypassing the adjustment pin increases the ripple rejection of the regulator.īesides replacing fixed regulators or discrete designs, the LM138 is useful in a wide variety of other applications. 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. Overload protection remains functional even if the adjustment (ADJ) pin is accidentally disconnected. Also included on the chip are thermal overload protection and safe area protection for the power transistor. Under sustained loading conditions, the current limit decreases to a safe value protecting the regulator. This allows the LM138 to be used with heavy transient loads and speeds start-up under full-load conditions. The current limit circuitry allows peak currents of up to 12 A to be drawn from the regulator for short periods of time. The LM138 family is supplied in a standard 3-lead transistor package.Ī unique feature of the LM138 family is time-dependent current limiting. Careful circuit design has resulted in outstanding load and line regulation, comparable to many commercial power supplies. They are exceptionally easy to use and require only 2 resistors to set the output voltage. The LM138 series of adjustable 3-terminal positive voltage regulators is capable of supplying in excess of 5 A over a 1.2-V to 32-V output range. Current Limit Constant With Temperature.parametric-filter USB power switches & charging port controllers.parametric-filter Supervisor & reset ICs.parametric-filter Power-supply filter ICs.parametric-filter Power over Ethernet (PoE) ICs.parametric-filter Multi-channel ICs (PMICs).parametric-filter Linear & low-dropout (LDO) regulators.parametric-filter LCD & OLED display power & drivers.parametric-filter Gallium nitride (GaN) ICs.parametric-filter DC/DC switching regulators. parametric-filter Battery management ICs.parametric-filter AC/DC & isolated DC/DC switching regulators.parametric-filter Wireless connectivity.parametric-filter Switches & multiplexers.parametric-filter Microcontrollers (MCUs) & processors.parametric-filter Logic & voltage translation.
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