The A4403 is a step-down converter with valley current feedback control. This control method ensures extremely low switching times, making it ideal for applications requiring high switching frequencies and high input and low output voltages.
Support for smaller and lower value inductors and capacitors with high switching frequencies up to 2 MHz for low cost. In addition, due to the high degree of integration, the external components required are minimized. The device uses an optimal drive circuit to minimize switching losses.
The switching frequency remains constant at all times as the input voltage adjusts the switching time. This feedforward control ensures ideal line correction. The switching time is set by an external resistor that controls the input voltage.
When the device is first powered on and started, a user-configurable soft-start function is enabled to minimize inrush current and prevent output overshoot. Installing small ceramic capacitors provides internal management and guidance voltage. In addition, a fast charge pump is provided to ensure proper operation at light loads.
Internal diagnostics provide comprehensive overcurrent, input undervoltage, and overtemperature protection.
The device is available in a 16-contact, 4 mm × 4 mm, 0.75 mm nominal total height QFN package with an exposed heatsink for enhanced thermal functionality. They are all lead-free and 100% matte tin plated.
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打印机、扫描仪
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线缆、DSL 调制解调器/路由器
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网络和电信
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工业控制
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配电系统
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机顶盒
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高功率 LED 电源
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电池充电器
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GPS/车用资讯娱乐系统
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极快负载瞬时响应及最小输出电压变化量
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实现高降压速率及
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用户可编程开关时间，切换频率高达 2 MHz
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需要最少的外部组件
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专为低值滤波电容器及电感器优化
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较宽的输入电压范围：9 至 46 V
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输出电流：3 A
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低待机电流
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采用增强散热功能的 QFN 封装