Description

Symmetric TPS7A4901/TPS7A3001 LDO PSU V2

PCB design for a bipolar PSU based on the TPS7A4901/TPS7A3001 low noise LDO regulators. It is capable of up to +150mA/-200mA current supply at +33/-33 VDC. The absolute maximum supply voltage to the board is 25 VAC (each rail) or +36/-36 VDC. The board size is 3x8 cm, mounting holes are on the 10 mm grid (2x7cm center-to-center distance). The schematic and images of the bare and assembled boards are attached.

PCB is hand solderable. The only challenge is soldering the thermal pads of the regulator ICs. It requires strong soldering iron to conduct the heat through the vias from the underside to the thermal pads. Using hot air rework station significantly simplifies the assembly.

Schematic and Layout

PSU schematic

SymmetricLDOPSU.V2.sch.png

Apr 11,2026

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Symmetric TPS7A4901/TPS7A3001 LDO PSU V2

2 Layers PCB 80 x 30 mm FR-4, 1.6 mm, 1, HASL lead free, Green Solder Mask, White silkscreen

Published: Apr 11,2026

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