LM2662/LM2663 switched capacitor voltage converter inverts a positive voltage in the range of 1.5V to 5.5V to the corresponding negative voltage. The LM2662/LM2663 uses two low cost capacitors to provide 200 mA of output current without the cost, size, and EMI related to inductor based converters. With an operating current of only 300 µA and operating efficiency greater than 90% at most loads, the LM2662/LM2663 provides ideal performance for battery powered systems. The LM2662/LM2663 may also be used as a positive voltage doubler.
The LM2662 and LM2663 are CMOS charge‑pump voltage converters that invert or double an input voltage from 1.5 V to 5.5 V, delivering up to 200 mA of output current with high efficiency. They use two low‑cost external capacitors and offer selectable oscillator frequencies and a shutdown mode for ultra‑low quiescent current.
The document provides absolute maximum ratings, electrical characteristics, typical performance curves, application circuits, capacitor selection guidance, and physical dimensions for the SO‑8 package (LM2662M/LM2663M).
| Input voltage range | 1.5 V to 5.5 V |
|---|---|
| Maximum output current | 200 mA |
| Typical efficiency | >90 % at most loads |
| Quiescent supply current (LM2662) | 300 pA |
| Shutdown quiescent current (LM2663) | 10 pA |
| Oscillator frequency (LM2662) | 20 kHz or 150 kHz (selected by FC pin) |
| Typical output resistance | 3.5 Ω |
The converters operate with an input voltage from 1.5 V to 5.5 V.
Both devices can deliver up to 200 mA of output current.
The LM2662 can be set to 20 kHz (FC open) or 150 kHz (FC tied to V+).