Designed to deliver enhanced power regulation it is a key solution for applications requiring stable, low-noise power supply.
The NR1644 is a 2 A output voltage regulator with a minimum output voltage as low as 0.4 V. It incorporates advanced features such as a high ripple rejection ratio of 110 dB at 1 kHz and ultra-low output noise voltage of just 5µVrms. It’s suitable for power-sensitive applications, including CMOS image sensors, RF communication devices, high-precision ADC/DACs, and SoC/FPGA power supplies.
A special feature is its automatic mode selection feature, which enables the NR1644 to dynamically switch between fast response mode and low-power consumption mode based on the application’s output current requirements. The main benefit is that the enlarged current consumption in fast mode only occurs when needed and maintaining power efficiency.
The NR1644 has a separated input terminal for the regulator driver and internal control circuitry. This results in a Bias pin to connect a supply voltage for the internal error amplifier, reference voltage circuit, and gate control voltage for the N-channel driver, the other VIN pin connects the N-channel driver. This design allows the LDO to regulate very low input and output voltages, even beyond limitations for typical P-Channel driver LDOs.
With an ultra-low dropout voltage of just 90 mV at 1 A output current and 180 mV at 2 A, the NR1644 ensures minimal power loss, making it particularly useful for battery-operated and IoT devices where power efficiency is crucial. It also features multiple built-in protection functions, including thermal shutdown, undervoltage lockout (UVLO), soft-start control, and a discharge function, ensuring reliable and safe operation under varying conditions.
An additional N-Channel open drain output provides a Power Good signal indicating that all protection circuits are in the safe mode.
The NR1644 minimises PCB space usage and is available in an ultra-compact DFN2020-8-GA package measuring just 2.0 × 2.0 mm typ., with a maximum thickness of 0.8 mm.
For rapid prototyping and development, evaluation boards featuring the device are available.
