Company news--Karmin Electronic (HK) Limited

Dior’s high PSRR LDO can reduce noise and ripple in noise sensitive applications
2025-08-14

Dior Inc. (Nasdaq: DIOD) announced the launch of AP7372 Low Noise Low Dropout (LDO) voltage regulator for powering precision components such as data converters (ADC, DAC), voltage controlled oscillators (VCO), and phase-locked loops (PLL).

AP7372 has a power ripple suppression (PSRR) of up to 90dB over a wide frequency range, and its output noise is extremely low, only 8 μ Vrms. This can help designers reduce the impact of input source noise and meet strict output ripple and noise targets. This is crucial for testing and measurement, communication, industrial automation, and medical equipment.

AP7372 provides an output current of up to 200mA with a voltage difference (VDO) of 120mV. There are five types of output voltages: 1.8V, 2.5V, 3.3V, and 5.0V fixed voltages, as well as adjustable voltages as low as 1.2V. AP7372 has a dedicated pin that is connected to an external resistor voltage divider, allowing for fine tuning of the fixed output. The input voltage range of AP7372 is 2.7V to 20V, which can be powered by common bus standards such as 12V and 5V or as low as the battery voltage of a single lithium-ion battery (VBAT).

AP7372 also provides adjustable soft start time, which can be easily set through external capacitors, allowing designers to optimize the power rail ramp up, thereby reducing surge currents and generating consistent and stable power. The current limiter can prevent short circuits and overcurrent, and has built-in thermal protection. A small 2.2 μ F ceramic output capacitor ensures stability and only requires an input capacitor and a soft start capacitor to form a complete circuit. The material list cost of AP7372 is low, and it is packaged in a 1.2mm x 1.0mm U-WLB1012-6 (Type A1) ball grid array, resulting in a compact circuit size and high power density.

In addition, AP7372 provides a startup pin that can be used for system level control (such as power on sorting) and can be turned off for energy-saving when not in use. The shutdown current is about 3 µ A, and the static current is 66 µ A, which ensures that AP7372 has a very low impact on the overall system power budget.

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