2 layers99.8 × 99.8 mm
Stmbl 5.0
freakontrol/stmbl
THE AUTHORS OF THIS SOFTWARE ACCEPT ABSOLUTELY NO LIABILITY FOR ANY HARM OR LOSS RESULTING FROM ITS USE. IT IS EXTREMELY UNWISE TO RELY ON SOFTWARE ALONE FOR SAFETY.
432 parts53GPL-3.0
2 layers40 × 38.1 mm
Dc dc-3-3V RT8259GE
Fescron/Project-LabAnalogDesign2Project-LabAnalogDesign2
- Size
- 40 × 38.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 27
- Nets
- 8
- Pads
- 47
- Tracks, vias
- 25, 1
- Pours
- 7
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 23 Nov 2019
- Updated
- 15 Oct 2021
Overview
Dc dc-3-3V RT8259GE is an open-source printed circuit board by Fescron, from the Fescron/Project-LabAnalogDesign2 repository on GitHub. It is a 2-layer board of 40 × 38.1 mm with 27 parts on 8 nets, routed with 25 tracks and 1 via.
It is built around the RT8259GE. Its parts include 5 capacitors, 3 resistors, 2 connectors, 1 IC and 1 diode. It belongs with the power and interfaces and adapters boards of this library.
Main components
1README
README.mdProject-LabAnalogDesign2
The goal of this lab was to design a 5 - 9V to 3,3V (500 mA min) buck converter from the ground up. We had to start from a given chip (RT8259GE) and create the rest ourselves.
Careful layout considerations were taken to lead to an optimal design. The 0Ω resistor is not on the schematic but only on the board layout. It's footprint was used to jump over the feedback track so everything is on the top layer. A via to GND is placed around it as well for redundancy.
JP1can be used to disable the buck converter.JP2can be used to bypass the sense resistorR3(measures the diode current).- A lot of test points (
TPx) are given to be able to measure different voltages. C4andC5are footprints for extra capacitors if the signals have too much ripple.
- VIN: 4,5 - 24 V
- VOUT: 3,3 V @ 1,2 A max
BOM
| Component | Value | Footprint | Other | Ordering |
|---|---|---|---|---|
| U1 | RT8259GE | SOT-23-6 | Richtek | |
| C1, C4 | 10 µF | 1206 | (X7R), 50V, 10% | Mouser.be |
| C2, C5 | 22 µF | 1206 | X7R, 10V, 10% | Mouser.be |
| C3 | 10 nF = 0,01 µF | 0805 | X7R, 50V, 10% | Mouser.be |
| D1 | If = 2A Vr = 40V Vf = 0,43V | SMA/SMB | Mouser.be | |
| L1 | 4,7 µH | NR8040 | Taiyo Yuden | Mouser.be |
| R1 | 62 kΩ | 0805 | 0,5% | Mouser.be |
| R2 | 19,6 kΩ | 0805 | 0,5% | Mouser.be |
| R3 | 0,1 Ω = 100 mΩ | 1206 | 1% | Mouser.be |
| 0Ω | 0 Ω | 1206 | Mouser.be | |
| J1, J2 | PTSA_1,5/_2-3,5-Z_BK | Pitch: 3,5 mm | 2 contacts, 250V 2A | Mouser.be |
WARNING: The pinout of J1 and J2 is reversed due to a footprint error (wrong top/bottom view). The Phoenix Contact connectors can however be manually separated and put back together in a way that they do fit on the board.
Parts
27| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | M3 | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 3 | TestPoint | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | TP2, TP3, TP5 |
| 2 | 10 µF | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C1, C4 |
| 2 | 22 µF | Capacitor_SMD:C_1206_3216Metric_Pad1.42x1.75mm_HandSolder | C2, C5 |
| 2 | Conn_01x02 | Connector_Phoenix_PTSA_extra:PhoenixContact_PTSA_1,5_2-G-3,5_1x02_P3.50mm_Angled | J1, J2 |
| 2 | TestPoint_2Pole | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | TP1, TP4 |
| 1 | 0,1 Ω | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | R3 |
| 1 | 10 nF | Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C3 |
| 1 | 19,6 kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R2 |
| 1 | 4,7 µH | Inductor_SMD:L_Taiyo-Yuden_NR-80xx_HandSoldering | L1 |
| 1 | 62 kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R1 |
| 1 | D_Schottky_Small_ALT | Diode_SMD:D_SMA-SMB_Universal_Handsoldering | D1 |
| 1 | Jumper_NC_Small | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP2 |
| 1 | Jumper_NO_Small | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | JP1 |
| 1 | RT8259GE | Package_TO_SOT_SMD:SOT-23-6_Handsoldering | U1 |
| 1 | R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | Resistor_SMD:R_1206_3216Metric_Pad1.42x1.75mm_HandSolder | 0Ω |
| 1 | Symbol_OSHW-EEVBLOG_SPFMDBC_10mm | BrechtVE_Aesthetics:OSHW-Logo_5.7x6mm_SolderMask | G1 |
The 26 most common of 27 parts.
Questions
How big is the Dc dc-3-3V RT8259GE PCB?
It measures 40 × 38.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Dc dc-3-3V RT8259GE use?
27 parts, built around the RT8259GE. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Dc dc-3-3V RT8259GE KiCad files?
From the Fescron/Project-LabAnalogDesign2 repository on GitHub, at the commit this page was made from: the board is hardware/dc-dc-3-3V-RT8259GE/dc-dc-3-3V-RT8259GE.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Dc dc-3-3V RT8259GE design in my own project?
Its repository states no licence, so its author keeps all rights: ask Fescron before reusing the design.
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