LTC1879 is a high efficiency synchronous step-down regulator from Linear Technology Corporation. It features a low quiescent current of 15µA and can be used in applications such as cellular telephones, portable computers, and wireless modems.
The LTC1879 is a high‑efficiency synchronous buck regulator featuring a constant‑frequency, current‑mode architecture. It operates from 2.65 V to 10 V input, delivers up to 1.2 A output, and achieves up to 95 % efficiency. The device includes burst‑mode and pulse‑skipping operation, a shutdown mode drawing less than 1 µA, and a soft‑start function.
The datasheet provides absolute maximum ratings, detailed electrical characteristics, pin descriptions, typical performance graphs, and a typical application circuit. The part is supplied in a 16‑lead SSOP package and is suitable for portable devices such as cellular phones, laptops, and wireless modems.
| Input Voltage Range | 2.65 V to 10 V |
|---|---|
| Output Voltage Range | 0.8 V to Vout |
| Maximum Output Current | 1.2 A |
| Quiescent Current (no load) | 15 µA |
| Shutdown Current | <1 µA |
| Switching Frequency | 550 kHz |
| Efficiency | Up to 95 % |
| Package | 16‑lead SSOP |
| Peak Switching Current | 3 A |
The device draws only 15 µA of quiescent current when there is no load.
Apply an external clock between 350 kHz and 750 kHz to the SYNC/MODE pin to synchronize the regulator.
The RUN/SS pin provides both soft‑start and shutdown capabilities.
The absolute maximum input voltage rating is 11 V.