2 layers254.5 × 176.8 mm
2 layers50 × 20 mm
Charger2
bentomo/Voltorb_R41Custom 7.4v Lithium Ion Charger + Battery Indicator and 1.9v, 3.3v and 5v Buck Regulator
- Size
- 50 × 20 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 81
- Nets
- 44
- Pads
- 198
- Tracks, vias
- 629, 219
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 18 Aug 2015
- Updated
- 18 Aug 2015
Overview
Charger2 is an open-source printed circuit board by bentomo, from the bentomo/Voltorb_R4 repository on GitHub, published under the GPL-2.0 licence. It is a 2-layer board of 50 × 20 mm with 81 parts on 44 nets, routed with 629 tracks and 219 vias.
It is built around the RT7258GQW. Its parts include 27 capacitors, 15 resistors, 8 transistors, 4 inductors and 3 ICs. It belongs with the power boards of this library.
Main components
1README
README.mdThis is a custom Lithium Ion Charger and Power board for a Nintendo Gamecube Portable. The board design was made in KiCad and can be downloaded and edited with the open source KiCad software.
This may or may not be the final version of the board, it's struggling with heat issues right now and while it works with a heatsink it can push up to 100 degrees celcius without it. The operating temperature is 85 degrees celcius max so this is not the desired operating temperature. (Who would want to deal with it being that hot anyway!)
The charger IC is a Linear Technologies LTC4006-6 which charges a 7.4v Li-ION pack at 3 amperes. The charger also has smart load switching to power a load while chargin the batteries by limiting the charge current and prioritizing the load.
The board has an adjustable low battery LED on the back that can turn on when a battery voltage is reached, this is not accurate but it is simple for an important feature.
There are 2 switching regulators on the PCB. There is a RichTek RT7258 and a Texas Instruments TPS542951 on the board. The Richtek regulator is suppying the 1.9v line to power a gamecube and can source up to 10 amperes. The TI regulator is a dual output regulator for the 3.3v logic line and a 5v line that can each source 2 amperes for miscellaneous components such as fans, rumble motors, screens etc.
As I said before this project is a work in progress and still has heat issues. It will charge a battery and power a gamecube as long as you are heatsinking the inductors.
I am not responsible for any damages to yourself or your properties. Batteries are nothing to fool with and if you're not careful and don't respect them then you do not deserve to work with this project.
Parts
81| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | SolderWirePad_single_2mmDrill | Wire_Pads:SolderWirePad_single_2mmDrill | , , 1.8v, 3.3v, 5v, 12v, B-, B+, CLED, GND, GND, GND, LL-, LL+, SW1, SW2 |
| 8 | 22u | Capacitors_SMD:C_0603 | C4, C9, C10, C11, C15, C17, C25, C26 |
| 5 | 100k | Resistors_SMD:R_0402 | R1, R10, R11, R14, R16 |
| 3 | 10u | Capacitors_SMD:C_0603 | C13, C19, C23 |
| 3 | 1u | Capacitors_SMD:C_0402 | C5, C6, C21 |
| 3 | 22.1k | Resistors_SMD:R_0402 | R3, R6, R9 |
| 3 | 4.7n | Capacitors_SMD:C_0402 | C8, C20, C22 |
| 3 | NPN | footprints:SOT-23 | Q5, Q6, Q7 |
| 3 | Q_PMOS | footprints:SOT-23 | Q1, Q3, Q4 |
| 2 | .1u | Capacitors_SMD:C_0402 | C18, C24 |
| 2 | 15p | Capacitors_SMD:C_0402 | C16, C27 |
| 2 | 1k | Resistors_SMD:R_0402 | R15, RL |
| 2 | 309k | Resistors_SMD:R_0402 | RT, RTH |
| 1 | footprints:logo_4_text | ||
| 1 | footprints:LOGO_4 | ||
| 1 | .033 | footprints:1206_Kelvin | RSEN |
| 1 | .036 | footprints:1206_Kelvin | RCL |
| 1 | .12u | Capacitors_SMD:C_0402 | C7 |
| 1 | .1u | footprints:nichicon_electrolytic | C1 |
| 1 | 1.5u | footprints:SRP1038A | L2 |
| 1 | 10u | Capacitors_SMD:C_1206 | C12 |
| 1 | 10v | footprints:SOT-23 | D1 |
| 1 | 124k | Resistors_SMD:R_0402 | R7 |
| 1 | 150u | Capacitors_SMD:C_1206 | C2 |
| 1 | 15n | Capacitors_SMD:C_0402 | C14 |
| 1 | 15u | footprints:Vishay_ER_inductor_15uH | L1 |
| 1 | 2.2u | footprints:abracon-aspi-4020hi | L3 |
| 1 | 22u | Capacitors_SMD:C_1206 | C3 |
| 1 | 28.7k | Resistors_SMD:R_0402 | R2 |
| 1 | 3.3u | footprints:bourns-SRP4020TA | L4 |
| 1 | 5.1k | Resistors_SMD:R_0402 | R8 |
| 1 | 6.04k | Resistors_SMD:R_0402 | R4 |
| 1 | 73.2k | Resistors_SMD:R_0402 | R5 |
| 1 | LTC4006 | footprints:SOP-16 | U1 |
| 1 | NMOS_vishay | Transistors_SMD:SO-8_PowerPAK_Vishay_Single | Q8 |
| 1 | POT | footprints:murata-pvz3a-pvz3g-pvz3h | RV1 |
| 1 | Q_NMOS | footprints:SOT-23 | Q2 |
| 1 | RT7258 | footprints:8-SOP+pad | U2 |
| 1 | TPS54295PWPR | footprints:PDSO-16 | U3 |
Questions
How big is the Charger2 PCB?
It measures 50 × 20 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Charger2 use?
81 parts, built around the RT7258GQW. 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 Charger2 KiCad files?
From the bentomo/Voltorb_R4 repository on GitHub, at the commit this page was made from: the board is charger2.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Charger2 design in my own project?
Its repository publishes it under the GPL-2.0 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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