The LT138A/LT338A 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 excel- 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 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 LT138A and LT338A are 5 A positive adjustable voltage regulators offering a guaranteed 1% initial tolerance and 0.3% load regulation. They operate over an output voltage range of 1.2 V to 32 V and include a 100% Thermal Limit Burn‑In for tight output voltage control.
Typical applications include high‑power linear regulation, battery chargers, and lamp drivers. The devices are supplied in a 3‑lead plastic TO‑3P package, support up to 35 V input‑to‑output differential, and feature internal current limiting for transient load currents up to 12 A.
| Maximum Output Current | 5 A |
|---|---|
| Output Voltage Range | 1.2 V to 32 V |
| Reference Voltage | 1.25 V (typical) |
| Input‑to‑Output Differential | 35 V |
| Operating Junction Temperature Range | 55 °C to 150 °C (LT138A) |
| Package Type | 3‑Lead Plastic TO‑3P |
| Thermal Limit Burn‑In | 100 % (enabled) |
The LT138A provides a guaranteed 1% initial tolerance.
Both devices are rated for a maximum output current of 5 A.
They can handle up to a 35 V input‑to‑output differential.
The LT138A is supplied in a 3‑lead plastic TO‑3P package.