A4490Powers printers, office automation, industrial and portable equipment with three high-current, high-performance, switching regulator outputs with independent soft-start.
High-frequency switching enables the use of low-cost inductors and small ceramic output capacitors. The turn-on cycles of the regulators are interleaved to minimize stresses on the input capacitors and to reduce EMI. The charge pump is used to supply power to the power switch, ensuring stable operation during large run duty cycles and avoiding the use of power-sinking clamp circuitry.
When the activation regulator is within the required specifications, indicates a power-on reset flag with a user-configurable delay. When the input voltage drops below specification, a power-on reset flag is indicated and a system controller is given advance warning when the switch continues to operate to the shutdown state.
Internal diagnostics provide comprehensive overload, input undervoltage, and overtemperature protection. The A4490 is available in a 20-contact, 4 mm × 4 mm, 0.75 mm nominal total height QFN package with exposed pads for enhanced heat dissipation. The packaging is lead-free and 100% matte tin plating.
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- Pictures, inkjet and portable printers
- For industrial use
- Handheld devices
- Portable applications
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- Three buck converters
- Input voltage range 4.5 to 34 V
- 550 kHz fixed frequency
- Multiphase switching
- Each converter is controlled independently
- Power-on reset flag
- Internal compensation
- 4 × 4 mm QFN package, small form factor PCB