2 layers74 × 69 mm
2 layers10 × 13.9 mm
Step down
aNThiCu/step-down-moduleA configurable step down module built to be placed on a pcb.
- Size
- 10 × 13.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 15
- Nets
- 7
- Pads
- 30
- Tracks, vias
- 24, 0
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 14 Jul 2025
- Updated
- 14 Jul 2025
Overview
Step down is an open-source printed circuit board by aNThiCu, from the aNThiCu/step-down-module repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 10 × 13.9 mm with 15 parts on 7 nets, routed with 24 tracks and 0 vias.
It is built around the AP5100WG, CL31A106KBHNNNE and CL21A226MAQNNNE, with the CL21C101JBANNNC, 0603WAF1002 and BCIHP0420SC-100M among its other parts. Its parts include 6 capacitors, 4 connectors, 2 resistors, 1 diode and 1 inductor.
Main components
9
AP5100WG
SOT-26-25℃~+85℃ 1 1.2A 1.4MHz 4.75V~24V 400uA 810mV~15V Adjustable Buck Buck Built-in SOT-26 DC-DC Converters ROHSDiodes IncorporatedDC-DC Converters
CL31A106KBHNNNE
120610uF 50V X5R ±10% 1206 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
CL21A226MAQNNNE
080522uF 25V X5R ±20% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMTCL21C101JBANNNC
0805100pF 50V C0G ±5% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
0603WAF1002
0603-55℃~+155℃ 100mW 10kΩ 75V Thick Film Resistor ±1% ±100ppm/℃ 0603 Chip Resistor - Surface Mount ROHSUNI-ROYALChip Resistor - Surface MountBCIHP0420SC-100M
SMD,4.4x4.2mm1.3A 10uH 282mΩ 2A Molded Inductor ±20% SMD,4.4x4.2mm Molding Power Inductors ROHSBCInductors (SMD)
CL10B223KB8NNN
060322nF 50V X7R ±10% 0603 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT0603WAF2001
0603-55℃~+155℃ 100mW 2kΩ 75V Thick Film Resistor ±1% ±100ppm/℃ 0603 Chip Resistor - Surface Mount ROHSUNI-ROYALChip Resistor - Surface Mount
B340A
SMA(DO-214AC)-55℃~+150℃ 1 Independent 3A 40V 500uA@40V 550mV@3A 80A SMA(DO-214AC) Schottky Diodes ROHSFUXINSEMISchottky Diodes
Parts
15| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | Conn_01x01_Pin | Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical | J1, J2, J3, J4 |
| 2 | 10u/1206 | Capacitor_SMD:C_0603_1608Metric | C1, C2 |
| 2 | 22u | Capacitor_SMD:C_0603_1608Metric | C4, C5 |
| 1 | 100p | Capacitor_SMD:C_0603_1608Metric | C6 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 10u/C2921170 | Inductor_SMD:L_Chilisin_BMRA00040420 | L1 |
| 1 | 22n | Capacitor_SMD:C_0603_1608Metric | C3 |
| 1 | 3.3k | Resistor_SMD:R_0603_1608Metric | R4 |
| 1 | AP5100WG-7 | SamacSys:SOT95P285X140-6N | PS1 |
| 1 | B340A | Diode_SMD:D_SMA | D1 |
Questions
How big is the Step down PCB?
It measures 10 × 13.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Step down use?
15 parts, built around the AP5100WG, CL31A106KBHNNNE, CL21A226MAQNNNE and CL21C101JBANNNC. 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 Step down KiCad files?
From the aNThiCu/step-down-module repository on GitHub, at the commit this page was made from: the board is step-down/step-down.kicad_pcb and its schematic step-down/step-down.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Step down design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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