Most relay applications require microprocessors that can control complex systems. These systems require microprocessor logic supply voltages, power-up reset circuits, and watchdog functionality. The Allegro® A2550 combines a voltage regulator, watchdog, reset, and three low-end DMOS relay driver outputs. Primarily targeted for automotive applications, the IC provides reliable performance over a wide range of voltages and temperatures.
Three low-end DMOS drivers can drive inductive loads, such as relay coils. The driver integrates an enhanced voltage clamp that can withstand automotive dump pulses up to 48V. The VBB's 40V rating also ensures that it can withstand the demands of the automotive environment.
The 5 V linear regulator provides 40 mA of output current with a 2% error over the operating temperature range. To extend the life of the IC in automotive applications, overcurrent protection is applied to the 5V regulator outputs and the three low-end driver outputs.
The A2550 also includes a power-on reset circuit (NPOR) and an integrated watchdog circuit. Both are used together to meet the monitoring and reset requirements of the system microprocessor.
The A2550 is available in a 16-pin TSSOP package (package LP) with an external heatsink. The package is lead-free and the pin frame is plated with 100% matte tin.
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三个独立的低端 DMOS 输出驱动器
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驱动器短路保护
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继电器上无需反激二极管
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过热断电功能
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独立式高精度 5 V 稳压器(2%)
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5 V 稳压器电流钳位
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16 针 TSSOP 封装，带有外置散热板。
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可编程复位 (NPOR) 时延
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可编程看门狗
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汽车级电压和温度范围
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满足汽车抛负载要求的有效钳位
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无铅