The NCV4279B is a 5.0 V precision micropower voltage regulator with an output current capability of 150 mA. The output voltage is accurate within ±2.0% with a maximum dropout voltage of 0.6 V at 150 mA. It features low quiescent current, drawing only 90 μA with a 100 μA load. This part is ideal for battery operated microprocessor equipment. The microprocessor control logic includes an active RESET (with DELAY) and a FLAG monitor, which provides an early warning signal to the microprocessor of a potential impending RESET signal. The use of the FLAG monitor allows the microprocessor to finish any signal processing before the RESET shuts it down. The active RESET circuit operates correctly at an output voltage as low as 1.0 V. The RESET function is activated during the power up sequence or if the output voltage drops outside the regulation limits during normal operation. The reset threshold voltage can be adjusted by connecting an external resistor divider to the RADJ lead. The regulator is protected against reverse battery, short circuit, and thermal overload conditions. It is suitable for use in automotive environments, as it can withstand load dump transients. The device has also been optimized for EMC conditions.
The NCV4279B is a 5 V precision micropower linear regulator designed for battery‑operated microprocessor equipment. It provides 150 mA output current, low 90 µA quiescent current, active reset with adjustable threshold, and a FLAG monitor for early‑warning of potential resets. The device includes protection against reverse battery, short‑circuit, and thermal overload, making it suitable for automotive and other demanding environments.
The datasheet lists electrical characteristics such as a maximum dropout voltage of 0.6 V at 150 mA, input voltage range –15 V to 45 V (peak transient), and detailed package options (SO‑8, SO‑14, SO‑20L). Application notes cover the use of the FLAG monitor, output capacitor selection, and thermal management, while ordering information and mechanical dimensions are provided for each package.
| Output Voltage | 5.0 V ±2.0% |
|---|---|
| Output Current | 150 mA |
| Quiescent Current | 90 µA |
| Dropout Voltage | 0.6 V at 150 mA |
| Input Voltage Range | –15 V to 45 V (peak transient) |
The regulator draws a low quiescent current of 90 µA.
It is protected against reverse battery, short‑circuit, and thermal overload conditions.
The NCV4279B can deliver up to 150 mA of output current.
The dropout voltage is 0.6 V when delivering 150 mA.