LM39300/39301/39302 is a 3A low-voltage low-dropout regulator with a minimum guaranteed output current of 3A and a typical dropout of 500mV (at 3A). It is ideal for 3.0V to 2.5V, 2.5V to 1.8V, or 1.5V conversions. Additionally, it features 1% initial accuracy, low ground current, current limiting and thermal shutdown, reversed-battery protection, reversed-leakage protection, fast transient response, etc.
The LM39300/39301/39302 family are 3 A low‑voltage low‑dropout (LDO) linear regulators offered in TO‑263 and TO‑220 packages. They deliver fixed output voltages of 1.5 V, 1.8 V, 2.5 V, 3.3 V and 5.0 V, with an adjustable version covering 1.25 V to 16 V. Typical dropout is 500 mV at full load, making them suitable for PC add‑in cards and battery‑powered systems.
Key features include 1 % initial accuracy, low ground current, current limiting, thermal shutdown, reversed‑battery and reversed‑leakage protection, and a TTL/CMOS‑compatible enable pin on the LM39301. The LM39301 also provides an open‑collector error‑flag output, while the LM39302 offers programmable output voltage.
| Typical dropout voltage | 500 mV at 3 A |
|---|---|
| Maximum output current | 3 A |
| Ground current (typical) | 36 mA at 3 A |
| Input voltage range | +2.25 V to +16 V |
| Enable voltage (logic high) | 2.25 V |
| Package types | TO‑263‑3L / TO‑220‑3L (fixed) and TO‑263‑5L / TO‑220‑5L (adjustable) |
| Fixed output voltages | 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5.0 V |
| Adjustable output range | 1.25 V to 16 V |
It is typically 500 mV when delivering 3 A.
The devices provide over‑current limiting, thermal shutdown, reversed‑battery protection, reversed‑leakage protection, and reversed‑lead insertion.
It is an open‑collector output that signals when the output voltage drops 5 % below the nominal value.
A minimum load current of 10 mA is required.