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3.3V-3A-step down converter powered by-USB-C

maudeve-it·3.3V-3A-step-down-converter-powered-by-USB-C·KiCad/USB power port.kicad_pcb

3.3V-3A-step down converter powered by-USB-C PCB layout, top view — open source board by maudeve-it

About the 3.3V-3A-step down converter powered by-USB-C PCB

3.3V-3A-step down converter powered by-USB-C is an open source PCB design by maudeve-it, published on GitHub under the MIT license. It is a 2-layer board measuring 45.9 × 21.9 mm, with 53 components from 37 distinct parts.

Other key parts include the TPS54331 and LM358. By type, the board carries 21 resistors, 9 capacitors, 7 test points, 5 transistors, 5 connectors and 3 diodes.

It belongs with the power & battery designs in this gallery.

From the project

Without using a USB-C PD controller chip, handling communication over the USB cable, USB-C standard allows to get 5V up to 3A through a hardware availability detection. Here I show a design developed on KiCad and made through JLCPCB, powering from a USB-PD source and providing 5V and 3.3 (through a step-down converter) up to 3A.

PLEASE NOTE Seeing the video is strongly suggested. Project stored here is what developed and tested on YouTube. Once connected to a USB-C PD source it shows a "transient" for about 12 seconds. Avoiding it, a filtering caoacitor should be added. Again as shown in the video.

NOTA BENE Vedere il video è fortemente suggerito. Il progetto archiviato qui è quello sviluppato e testato su YouTube. Connesso ad una alimentazione USB-C PD, mostra un "transitorio" di circa 12 secondi e per evitarlo si deve aggiungere un condensatore di filtro. Ancora come mostrato nel video.

3.3V-3A-step down converter powered by-USB-C, from the project README
From the project README

Main components on the 3.3V-3A-step down converter powered by-USB-C

TPS54331LM358

3.3V-3A-step down converter powered by-USB-C bill of materials (BOM)

53 components, 37 distinct parts.

QtyPartRefs
1
TPS54331
U1
1
LM358
U2
1
SS8050
Q1
1
AO3401A
Q2
3
2N7002
Q4, Q5, Q6
1
USB port
J1
2
Selector
J2, J3
1
3.3V conn.
J4
1
5V conn.
J5
1
CC2
TP1
1
CC1
TP2
1
GND
TP3
1
T1
TP4
1
T2
TP5
1
T3
TP6
1
T4
TP7
1
SS34
D1
1
RED
D2
1
GREEN
D3
1
3.3uH
L1
Show 17 more
QtyPartRefs
2
4.7 uF
C1, C2
3
0.1uF
C3, C4, C7
1
1.5nF
C5
1
27pF
C6
2
47uF
C8, C9
1
47k
R1
5
5.1k
R2, R3, R12, R13, R19
1
1.2k
R4
1
820
R5
1
180
R6
1
330
R7
2
10k
R8, R22
1
3.3K
R9
2
6.8k
R10, R11
4
100
R14, R16, R17, R18
1
2k
R20
1
1.1k
R21

3.3V-3A-step down converter powered by-USB-C design files

The KiCad project lives in the maudeve-it/3.3V-3A-step-down-converter-powered-by-USB-C repository on GitHub; these links point at the commit this page was built from.

3.3V-3A-step down converter powered by-USB-C: common questions

How big is the 3.3V-3A-step down converter powered by-USB-C PCB?

The 3.3V-3A-step down converter powered by-USB-C measures 45.9 × 21.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the 3.3V-3A-step down converter powered by-USB-C?

53 components, from 37 distinct parts. The full bill of materials is listed on this page.

Where can I download the 3.3V-3A-step down converter powered by-USB-C design files?

From the maudeve-it/3.3V-3A-step-down-converter-powered-by-USB-C repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the 3.3V-3A-step down converter powered by-USB-C design in my own project?

Yes, under the terms of its MIT license, which maudeve-it chose for the repository.

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