A4490EESTR-T

• Product Introduction

The A4490 can power printers, office automation, industrial and portable devices with three high-current, high-performance, switching regulator outputs with independent soft-start.

High-frequency switches support 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 under large operating cycles and avoiding the use of power draw-in clamping circuits.

When the activation regulator is within the required specification range, it indicates a power-on reset sign with a user-configurable delay. When the input voltage drops below specification, the power-on reset sign is indicated, and the system controller is warned in advance 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 plated.

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• 图片、喷墨及便携式打印机
• 工业用
• 手持式设备
• 便携式应用
• • 三个降压转换器
  • 输入电压范围 4.5 至 34 V
  • 550 kHz 固定频率
  • 多相切换
  • 各转换器独立控制
  • 上电复位标志
  • 内部补偿
  • 4 × 4 mm QFN 封装, 小型 PCB