The LM3355 is a CMOS switched capacitor DC/DC converter that produces a regulated output voltage by automatically stepping up (boost) or stepping down (buck) the input voltage. It accepts an input voltage between 2.5V and 5.5V. The LM3355 is available with a standard output voltage of 4.1V (ideal for white LED applications).
The LM3355 is a CMOS switched‑capacitor DC/DC converter that can step up (boost) or step down (buck) an input voltage of 2.5 V to 5.5 V, providing a regulated output between 1.8 V and 4.1 V at up to 50 mA. It is offered in a compact 10‑pin MSOP package, making it suitable for battery‑powered, portable, and hand‑held applications.
The datasheet includes electrical characteristics, absolute maximum ratings, typical performance graphs, pin descriptions, ordering information, and design guidelines such as capacitor selection, layout considerations, and thermal protection. It also contains regulatory and life‑support policy statements.
| Input Voltage Range | 2.5 V to 5.5 V |
|---|---|
| Output Voltage Options | 1.8 V to 4.1 V (selectable) |
| Maximum Output Current | 50 mA |
| Efficiency | >75 % (average) |
| Switching Frequency | 1 MHz (typical) |
| Package | MSOP‑10 |
| Package Dimensions | see Physical Dimensions section |
The LM3355 can supply up to 50 mA of output current.
It accepts an input voltage from 2.5 V to 5.5 V.
The standard output voltage is 4.1 V.