The FS8802 is a high efficiency low start-up voltage step-up DC-DC converter that operates from an input voltage as low as 1V.
The FS8802 is a high‑efficiency boost regulator designed for portable devices powered by 1‑ to 4‑cell batteries. It operates from an input as low as 1 V, delivers up to 400 mA load current, and provides a selectable output voltage from 2.5 V to 6 V using two external resistors. The device includes an internal 2 A NMOS power switch, a low‑battery detector (0.86 V threshold), and a fixed 550 kHz switching frequency, all packaged in an 8‑lead SOP case.
Typical applications include digital cameras, MP3 players, PDAs, wireless equipment, and other single‑ or dual‑cell battery‑operated products. The datasheet details pin functions, absolute maximum ratings, electrical characteristics, layout recommendations, and component selection guidelines for inductors and capacitors to achieve optimal performance.
| Low start‑up input voltage | 1.0 V at 1 mA load |
|---|---|
| Output voltage range | 2.5 V to 6 V |
| Switching frequency | 550 kHz (fixed) |
| Efficiency | 90 % (typical) |
| Package | SOP‑8 |
| Low‑battery detector threshold | 0.86 V |
The device can start up with an input of 1.0 V when the load current is 1 mA.
The output voltage is set by two external resistors forming a feedback divider; Vout = (R1/R2) × 1.25 V.
The converter operates at a fixed switching frequency of 550 kHz.
The FS8802 is supplied in an 8‑lead SOP (SOP‑8) package.