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A4450：带集成降压 MOSFET 的降压-升压控制器

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A4450 ECAD Model
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Description

Top Features

A4450 是一种电源管理 IC，它能被设置成降压或升降压稳压器，用于将汽车蓄电池的电压高效地转换为精确稳压电压，并提供控制、诊断和保护功能。
A4450 的启用输入兼容高压电池级 (ENB)。
A4450 的诊断输出包括加电重置输出 (NPOR) 信号。
保护功能包括逐脉冲电流限制、打嗝模式短路保护、丢失续流二极管（A4450 的 LX 节点的降压二极管）保护和热关机功能。
A4450 最适合输入电压可能小于或大于稳压输出电压的应用。
A4450 采用 4 × 4 mm QFN（后缀 “ES”）封装，并带外露电源板。

 

应用

  • 资讯娱乐
  • 仪表组
  • 控制模块
  • 通过 AEC-Q100 汽车电子测试标准的认证
  • 3 至 36 VIN 宽工作范围，最大输入电压 40 V，涵盖汽车启动/停车、冷车发动、双电池和负载突降
  • 稳压输出范围最高 2 A DC
  • 可调节 PWM 开关频率：250 kHz 至 2.2 MHz
  • PWM 频率可与外部时钟同步：250 kHz 至 2.4 MHz
  • 频率抖动可减少 EMI/EMC
  • 欠压保护
  • 每个引脚都具有引脚对引脚和引脚对地防短路功能
  • 过热保护
  • 工作结温范围为 −40°C 到 150°C
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An Efficient Voltage-Optimized LED Driver (A80804) with Buck-Boost Controller (A4450)
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A4450 Design Tool