The MAX722 and MAX723 are CMOS switch‑mode power‑supply regulators designed for small, battery‑operated systems such as palmtop computers and portable data‑collection equipment. Each device delivers a selectable main output (3.3 V or 5 V) and a negative auxiliary output adjustable for LCD contrast, with high efficiency and low quiescent current.
The datasheet details electrical characteristics, pin functions, typical operating curves, and design equations for both the main and auxiliary regulators. It also includes ordering information, package dimensions, and application notes for implementing the ICs in portable devices.
| Battery input voltage range | 0.9 V to 5.5 V |
|---|---|
| Unregulated DC input range | 7 V to 20 V |
| Main output voltage | 3.3 V or 5 V (selectable) |
| Efficiency at 200 mA | 87 % |
| Maximum switching frequency | 500 kHz |
| Package type | 16‑Pin Narrow SO |
The device operates from a battery input of 0.9 V to 5.5 V and can also accept an unregulated DC source from 7 V to 20 V.
The MAX722 achieves 87 % efficiency at a 200 mA load.
The MAX722 is offered in a 16‑pin narrow SO package.