The A8450 is a multi-output power supply for automotive applications. The A8450 has a wide input power range and is designed for applications with high ambient temperatures.
Four regulated outputs are available with multiple options. 3.3-volt regulators and 1.2 to 3.3-volt adjustable regulators can be used to power a microcontroller or DSP core, or for I/O, sensing, and A-to-D conversion. Two 5-volt outputs, one digital and one analog, enable output tracking over the operating temperature range, ensuring an error of no more than 0.5% of each other. In addition, the analog regulator is not affected by battery short circuits. All four regulators provide listening current limit protection.
The device can be enabled or disabled using two input pins. The high voltage input on the ENBAT pin can be enabled/disabled using the engine ignition or battery switch signal. The logic circuit-level input on the ENB pin allows the microcontroller or DSP signal to be enabled/disabled.
When disabled, the A8450 draws less than 10 μA. A POR (Power-On Reset) reducer monitors the supply voltage and provides a reset signal with an adjustable delay for resetting the microcontroller or DSP. The independent fault pin emits TSD (overheating power loss), 5-volt analog power short, and 5-volt analog or digital undervoltage signals.
The A8450 is available in a 24-pin SOIC package (model suffix LB) with a protective power supply ground pin for enhanced thermal performance. This will provide RθJA at 35°C/W on a 4-layer board.
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6 伏特至 45 伏特的输入范围
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直流－直流降压转换器，提供 5.7 伏特输出
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带监听功能的过电流保护及欠压锁定
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双路 5 伏特输出
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数字 5 伏特 ±2%，200 毫安
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模拟 5 伏特，200 毫安
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模拟稳压器上的电源短路保护
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整个工作温度范围内，模拟至数字稳压器输出跟踪
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3.3 伏特线性稳压器，带监听电流限制
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可调整 1.2 伏特到 3.3 伏特线性稳压器，可调整的监听系统
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启用点火开关；休眠模式
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低输入电压的 100% 工作循环操作
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Power OK（电源工作正常）输出
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-40°C 到 135°C 的工作环境温度范围