LinearPi Pro high-current ultra-low noise Linear power supply full SMT

Introduction

LinearPi Pro is a new generation top-quality high current ultra-low noise audiophile grade linear power supply. It can deliver up to 5A continuous output current at extremely low-noise level which is much suitable for Raspberry Pi 5 and other high current noise sensitive applications. It could be the best linear power supply solutions for both digital and analog audio applications.

Multiple LinearPi Pros can be grouped into a big power supply system. LinearPi Pro can also be upgraded to an 5V/3.3V ultra capacitor power supply by integrating with UcConditioner/Pro for even lower noise performance.

LinearPi Pro New Features

• 5A high continuous output current.
• 2.5 mOhm ultra-low output impedance.
• New parallel power output stages architecture.
• 4 layers double copper thickness PCB for higher current density and additional shield layers.
• 29080 uF total filtering capacitance.
• Enhanced Kelvin sense input to lower the output impedance and improve performance.
• Actual noise level superior to LinearPi MkII because of the shield layer and the new parallel architecture.
• New low drop high speed high current soft recovery Schottky rectifiers.
• Bigger size heatsink

Other Specifications and Highlighted Features

• 0.8uV Ultra-low noise level.
• Built-in ON/OFF control logic with on-board or possible external ON/OFF control switch.
• Multiple LinearPi Pros can be grouped into a big power supply system by making use of the built-in isolated master/slave on-off control signal chain.
• Seamlessly integrates with UcConditioner/Pro to be upgraded to an ultracapacitor power supply.
• Optimized for continuous AC input mode to get best possible sound quality.
• Deal with MLCC piezoelectric effect noise.
• 5V, 3.3V and 12V configurations.
• Two stages ultra-low noise soft start up feature great for both digital and analog application.
• Fully SMT high-quality heavy-duty design.

Great Load Transient Response Measurement Result

Real measurement shows that the LinearPi Pro has a super great load transient response performance. The output voltage drop measured is only super low 10mV level when output current changes over very big steps between 1A to 5A. Which means the actual dynamic output impedance is only 2.5mOhm (@1kHz). So the LinearPi Pro could be the best performance among all the low-noise linear power supplies in the market.

Load current steps: 1A to 5A,  Output voltage: 5V
Frequency: 1kHz, Duty cycle: 50%, Probe: 1:1, 10mV/DIV

Upgrade with a UcConditioner Pro to make an even more improvement to the low-noise performance

It’s highly recommended to enable the enhanced Kelvin sensing function when working with a UcConditioner Pro

Difference between LinearPi MkII

#38F. LinearPi Pro Pi5SE

Many people are trying to power a RaspberryPi 5 via GPIO without success unless using a PurePi or UcPi. The Pi5 LED keeps red and they have to press the power button to be able to boot the Pi5. The reason is that there are very special start up requirements to power a RaspberryPi5 through GPIO. That’s why most linear power supplies don’t work for Pi 5 even though they are capable of delivering 5A current, which really limits the using of many low noise linear power supplies for Pi5. 

LinearPiPro Pi5SE is a special edition that can directly power a RaspberryPi5 via GPIO  without any issue. When using this Pi5SE, the RaspberryPi 5 LED will turn green and start to boot immediately. No longer need to press the power button. LinearPi Pro Pi5SE can also be upgraded with a UcConditioner/Pro for an even better performance.

User's manual

Dimensions and other documents

YouTube Video

Optional Accessories to Upgrade

1. #61C External ON/OFF switch
2. UcConditionerPro
3. #34C Standoff/Screw set to stack UcConditioner on top
4. #55A CmChoker to lower the common mode noise
5. Fork spade terminal connectors

Note:

1. Please use AC 6V input if work with a UcConditioner/Pro. Exceed this voltage  may cause fuse blown at the moment of enter conditioning mode.
2. To use an external on/off switch, the on-board on/off switch must be kept at off position.
3. Because of the 5A high output current, when use the USB-C output, please only plug or unplug the USB-C connector (either at power supply or at device side) when LinearPi is at off status and then turn on the LinearPi after the connector is well plugged. Please use the USB-C output for 5V configuration only.