SA1117 is a positive voltage output low dropout three-terminal linear regulator, with a dropout of 1.2V under 1A output current. SA1117 is divided into two versions, fixed voltage output version and adjustable voltage output version. The fixed output voltage of 1.5V, 1.8V, 2.5V, 3.3V, 5.0V and the adjustable version have an accuracy of 1%, and the fixed voltage of 1.2V has an output voltage accuracy of 2%. SA1117 integrates over-temperature protection and current limiting circuits, and is suitable for various electronic products.
The SA1117 is a positive‑voltage, low‑dropout three‑terminal linear regulator designed for 1 A output current. It is offered in fixed‑voltage versions (1.5 V, 1.8 V, 2.5 V, 3.3 V, 5.0 V) and an adjustable version, with a 1.2 V version that has 2 % voltage accuracy. The device includes internal over‑temperature shutdown and current‑limit circuitry and is suitable for laptops, handheld computers, battery chargers, mobile phones, cordless phones, battery‑powered systems and portable equipment.
Key features include low dropout voltage (1.2 V at 1 A), selectable output voltages, wide operating temperature range (‑40 °C to +125 °C), various package options (SOT‑223, SOT‑89, TO‑220, TO‑252, etc.), and detailed electrical characteristics such as PSRR, quiescent current, and ripple suppression. This manual is written in Chinese.
| Dropout voltage (1 A) | 1.2 V |
|---|---|
| Operating temperature range | ‑40 °C ~ +125 °C |
| Fixed output voltages | 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5.0 V (1.2 V version 2 % accuracy) |
| PSRR (120 Hz) | 75 dB |
The dropout voltage is 1.2 V at a 1 A output current.
It operates from –40 °C to +125 °C.
The device includes over‑temperature shutdown and current‑limit protection.
Fixed outputs are 1.5 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V, with a 1.2 V version that has 2 % accuracy.