The LM2931 series low dropout regulators are adjustable output regulators with ON/OFF pin. It has very low quiescent current and extremely low input-output differential, which makes it ideal for standby power systems. Applications include memory standby circuits, CMOS and other low power micro processor power supplies as well as systems demanding as much as 100mA of output current. The series includes a fixed 5V output (±3.8% tolerance, A grade) or an adjustable output, which is available in a TO-220 power package, TO-263 surface mount package and an 8-lead surface mount package.
The LM2931 series low‑dropout regulators are designed for low‑power standby and automotive applications. They feature a very low quiescent current, low input‑output differential, and built‑in protections such as reverse‑battery and load‑dump protection.
The document includes a general description, features, connection diagrams, ordering information, typical applications, absolute maximum ratings, detailed electrical characteristics, performance graphs, physical dimensions, and compliance notices.
| Quiescent current | ≤ 1 mA (at 10 mA load) |
|---|---|
| Maximum output current | > 100 mA |
| Input‑output differential | ≤ 0.6 V |
| Reverse battery protection | Enabled |
| Load‑dump protection | 60 V |
| Dropout voltage (10 mA load) | 0.05 V typical |
| Fixed 5 V output voltage (typical) | 5.19 V |
The LM2931 has a very low quiescent current of 1 mA or less when supplying a 10 mA load.
It includes reverse‑battery protection, 60 V load‑dump protection, short‑circuit protection, internal thermal overload protection, and mirror‑image insertion protection.
The device can deliver output currents in excess of 100 mA.
The typical dropout voltage at a 10 mA load is 0.05 V.