High current LDO addresses noise-sensitive power conversion
A 3A-rated low dropout (LDO) voltage regulator, the AP7179D, by Diodes supports 4.4 microV RMS operation (at 0.8V output). It delivers a clean supply and is optimised for powering noise-sensitive components – such as the high-performance SerDes, RF components and data converters in high speed communications, test and measurement, medical, and video applications. It can be incorporated into remote radio units (RRUs), outdoor backhaul units, mMIMO active antenna systems, ultrasound scanners, radar systems, and lab/field instrumentation, advised Diodes.
The AP7179D has a ± one per cent 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. The low noise reference and error amplifier enables a minimal noise floor, added the company. Its 40dB power supply rejection ratio (PSRR) at 500kHz substantially lowers the coupling of input supply noise to the output.
There are two output voltage selection modes for this LDO, which are pin-programmable between 0.8V and 3.95V, or adjustable using an external resistor divider from 0.8V to 5.5V.
The low output noise mitigates both power supply generated phase noise and clock jitter which, coupled with its high-current capabilities, means this device is compatible with high performance processors, such as FPGAs, ASICs, and DSPs.
The AP7179D is housed in a compact 20-pin W-QFN3535 (Type A1) package.
Diodes provides semiconductor products to companies in the automotive, industrial, computing, consumer electronics and communications markets. Its portfolio consists of discrete, analogue and mixed-signal products and packaging technology. The company has operations in 23 sites around the world, including engineering, testing, manufacturing, and customer service.
