The A4490 is a triple output step-down switching regulator designed to provide the power supply requirements of printers, office automation, industrial, and portable equipment.
The A4490 is a triple‑output step‑down switching regulator that integrates three independent buck converters. It operates from a 4.5 V to 34 V input range, uses a fixed 550 kHz switching frequency, and includes features such as a power‑on‑reset flag, internal compensation and a charge‑pump for wide duty‑cycle operation. The device is offered in a 20‑contact QFN package (suffix ES) for a compact PCB footprint.
Typical applications include printers, office automation, industrial equipment and portable devices. The regulator provides high‑current outputs with independent soft‑start, overload protection, undervoltage lockout and thermal shutdown, making it suitable for demanding power‑supply designs.
| Input voltage range | 4.5 V to 34 V |
|---|---|
| Switching frequency | 550 kHz |
| Package | 20‑contact QFN (suffix ES) |
| Minimum duty cycle | 5 % |
The A4490 operates from 4.5 V up to 34 V input.
It contains three independent buck converters.
The regulator uses a fixed 550 kHz switching frequency.
It is supplied in a 20‑contact QFN package (suffix ES).