Automotive LDO packs watchdog timer

Nisshinbo’s NP4271 LDO regulator features a high-precision watchdog timer and reset functions through window-type output voltage monitoring. Designed for automotive functional safety, the series meets the need for external MCU monitoring and reliable voltage-based reset functions in electronic control units (ECUs).

The LDO operates across a broad input voltage range of 4.0 V to 40 V and offers two output voltage options of 3.3 V or 5.0 V. Output voltage is accurate to within ±2.0% over a range of conditions, including input voltages from 6 V to 40 V, load currents from 5 mA to 500 mA, and temperatures ranging from -40°C to +125°C.

Two reset function options are available based on output voltage monitoring. Version A monitors both the low and high sides, while Version B monitors only the low side. Detection voltage accuracy is ±2.0% for the low side and ±5.0% for the high side, across the full temperature range. Additionally, the NP4271 provides high timing accuracy for both watchdog timer monitoring and reset times.

The NP4271 automotive LDO regulator is available through Nisshinbo authorized distributors, including DigiKey and Mouser.

NP4271 product page

Nisshinbo Micro Devices 

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