The UTC LD1117/A is a low dropout, 3-terminal positive voltage regulator designed to provide output current up to 800mA/1A. There are adjustable version (VREF=1.25V) and various fixed versions.
The LD1117/A is a low‑dropout, 3‑terminal positive voltage regulator from Unisonic Technologies. It is available in fixed and adjustable versions and can deliver up to 800 mA (LD1117) or 1 A (LD1117A). The device includes built‑in current limit and over‑temperature protection and is offered in several surface‑mount and through‑hole packages such as SOT‑223, SOT‑89, TO‑220, TO‑252, TO‑263, TO‑263‑3, and SOP‑8.
Key electrical characteristics include an input voltage range of 3 V to 8 V (recommended 15 V), a typical dropout voltage of about 1.20 V at 800 mA, and a quiescent current of 5‑10 mA. The datasheet also provides absolute maximum ratings, recommended operating conditions, and application notes for adjustable output configurations.
| Maximum output current | 0.8 A (LD1117) / 1 A (LD1117A) |
|---|---|
| Dropout voltage at 800 mA | ≈ 1.20 V |
| Quiescent current | 5 – 10 mA |
| Operating junction temperature range | -40 °C – +125 °C |
The LD1117 version supplies up to 0.8 A, while the LD1117A version can supply up to 1 A.
The typical dropout voltage at 800 mA is about 1.20 V.