High accuracy LDO fulfils noise-sensitive power conversion applications

Diodes Incorporated offers a 3A-rated LDO voltage regulator supporting 4.4µVRMS operation (at 0.8V output). Providing a clean supply, the AP7179D is highly optimised for powering noise-sensitive components, including high-performance SerDes, RF components, and data converters needed for high-speed communications, test and measurement, medical, and video applications. RRUs, outdoor backhaul units, mMIMO active antenna systems, ultrasound scanners, radar systems, and lab/field instrumentation are among the types of hardware into which it can be integrated.

The device has a ±1% output accuracy across line, load, and temperature. This device’s 180mV (maximum) dropout voltage at a 3A load current supports a wide voltage conversion range. Its low-noise reference and error amplifier allow a minimal noise floor. Also, its 40dB PSRR at 500kHz substantially lowers the coupling of input supply noise to the output.

This LDO has two output voltage selection modes: pin-programmable between 0.8V and 3.95V or adjustable, utilising an external resistor divider from 0.8V to 5.5V. The resulting flexibility greatly decreases the number of accompanying components required.

The device’s low output noise mitigates power-supply-generated phase noise and clock jitter. Because of this, alongside its high-current capabilities, this device is compatible with high-performance processors, such as FPGAs, ASICs, and DSPs.

The device is housed in a compact 20-pin W-QFN3535 (Type A1) package.