2 layers95.9 × 90.2 mm
2 layers99.5 × 99.5 mm/Charge%20Controller.kicad_pcb.jpg)
Charge Controller
UWCubeSat/BMS-EPS-HS2Repository of the HS-2 Battery Management System
- Size
- 99.5 × 99.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 55
- Nets
- 39
- Pads
- 174
- Tracks, vias
- 461, 41
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 5 Oct 2025
- Updated
- 21 May 2026
Overview
Charge Controller is an open-source printed circuit board by UWCubeSat, from the UWCubeSat/BMS-EPS-HS2 repository on GitHub. It is a 2-layer board of 99.5 × 99.5 mm with 55 parts on 39 nets, routed with 461 tracks and 41 vias.
It is built around the BQ25756RRVR, TMK325ABJ476MM-P and AONS66614, with the ESR25JZPJ104, HRG3216P-1002-B-T1 and CL21A475KAQNNNE among its other parts. Its parts include 6 resistors, 4 transistors, 3 capacitors, 3 diodes and 2 connectors.
Main components
12
BQ25756RRVR
VQFN-36(5x6)-40℃~+125℃ 17uA 1~14 20A 4.2V~70V Charging IC I2C Lithium Battery、LiFePO4 Battery Support VQFN-36(5x6) Battery Management ROHSTexas InstrumentsBattery Management
TMK325ABJ476MM-P
121025V 47uF X5R ±20% 1210 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSTaiyo YudenMultilayer Ceramic Capacitors MLCC - SMD/SMTAONS66614
DFN-8(5x6)1 N-channel 1.8V 2.4mΩ@10V 3.31nF 30pF 51nC 60V 745pF 78W 85A N-Channel Standalone ±20V DFN-8(5x6) MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
ESR25JZPJ104
1210-55℃~+155℃ 100kΩ 200V 667mW Thick Film Resistor ±200ppm/℃ ±5% 1210 Chip Resistor - Surface Mount ROHSROHM SemiconductorChip Resistor - Surface Mount
HRG3216P-1002-B-T1
1206-55℃~+155℃ 10kΩ 1W 200V Thin Film Resistor ±0.1% ±25ppm/℃ 1206 Chip Resistor - Surface Mount ROHSSusumuChip Resistor - Surface Mount
CL21A475KAQNNNE
080525V 4.7uF X5R ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMTESR25JZPJ100
1210-55℃~+155℃ 10Ω 200V 667mW Thick Film Resistor ±200ppm/℃ ±5% 1210 Chip Resistor - Surface Mount ROHSROHM SemiconductorChip Resistor - Surface MountMCS1632R005FER
12061W 5mΩ Current Sense Resistor SMD ±1% ±100ppm/℃ 1206 Current Sense Resistors / Shunt Resistors ROHSOhmiteCurrent Sense Resistors/Shunt Resistors
103AT-2
ThroughholeThroughhole NTC Thermistors ROHSSEMITECNTC ThermistorsCL21B105KAFNNNE
08051uF 25V X7R ±10% 0805 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSSamsung Electro-MechanicsMultilayer Ceramic Capacitors MLCC - SMD/SMT
CPF0805B25KE1
0805-55℃~+155℃ 100V 100mW 25kΩ Thin Film Resistor ±0.1% ±25ppm/℃ 0805 Chip Resistor - Surface Mount ROHSTE ConnectivityChip Resistor - Surface MountESR25JZPJ105
1210-55℃~+155℃ 1MΩ 667mW Thick Film Resistor ±200ppm/℃ ±5% 1210 Chip Resistor - Surface Mount ROHSROHM SemiconductorChip Resistor - Surface Mount
README
README.mdBMS-EPS-HS2
Repository of the HS-2 Battery Management System
Parts
55| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | CL05B104KA5NNNC | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C-BTST1, C-BTST2, C1, C2, C8, C9 |
| 6 | TMK325ABJ476MM-P | Capacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolder | C-IN1, C-IN2, C-IN3, C-IN4, C-OUT1, C-OUT2 |
| 4 | AONS66614 | SamacSys_Parts:AON6482 | Q1, Q2, Q3, Q4 |
| 3 | ESR25JZPJ104 | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R-CE1, R-LOW1, R-Pull_Down1 |
| 3 | HRG3216P-1002-B-T1 | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R2, R3 |
| 3 | RMCP2010FT100R | Resistor_SMD:R_2010_5025Metric_Pad1.40x2.65mm_HandSolder | R-DRV_REGN1, R7, R8 |
| 2 | CL05A474KA5NNNC | Capacitor_SMD:C_0402_1005Metric_Pad0.74x0.62mm_HandSolder | C3, C7 |
| 2 | CL21A475KAQNNNE | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C-DRV_SUP1, C-REGN1 |
| 2 | ESR25JZPJ100 | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R4, R5 |
| 2 | MCS1632R005FER | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R_BAT_SNS1, R-AC_SNS1 |
| 1 | 103AT-2 | SamacSys_Parts:103AT2 | Thermistor1 |
| 1 | 61300211121 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | Bat_Input1 |
| 1 | 61300211121 | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | Solar_Panel_Input1 |
| 1 | 61300311121 | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | J1 |
| 1 | 860020473008 | Capacitor_THT:CP_Radial_D6.3mm_P2.50mm | C_Sys1 |
| 1 | BQ25756RRVR | BQ25756:VQFN36_RRV_TEX | U1 |
| 1 | CL21B105KAFNNNE | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C4 |
| 1 | CPF0805B25KE1 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R-FB_Bot1 |
| 1 | CRCW080540K0FKEA | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R-FSW1 |
| 1 | Conn_01x02_Pin | Connector_PinSocket_2.54mm:PinSocket_1x02_P2.54mm_Vertical | J2 |
| 1 | ERA-3AEB302V | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R-I_Out1 |
| 1 | ERA-3AEB303V | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R-T2 |
| 1 | ERJ-2RKF5231X | Resistor_SMD:R_0402_1005Metric_Pad0.72x0.64mm_HandSolder | R-T1 |
| 1 | ESR25JZPJ105 | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R-AC1 |
| 1 | ESR25JZPJ204 | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R-AC2 |
| 1 | ESR25JZPJ2R4 | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R6 |
| 1 | ESR25JZPJ753 | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R-AC3 |
| 1 | IHLP6767GZER100M01 | SamacSys_Parts:INDPM172172X700N | L1 |
| 1 | KB EELP41.12-P1R2-36-3X4X-5-R18 | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D2 |
| 1 | KO EELP41.22-Q1S2-25-A8J8-020-R18 | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1 |
| 1 | RNCF0805BTE250K | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R-FB_Top1 |
| 1 | SMLD12EN1WT86 | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D3 |
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Questions
How big is the Charge Controller PCB?
It measures 99.5 × 99.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Charge Controller use?
55 parts, built around the BQ25756RRVR, TMK325ABJ476MM-P, AONS66614 and ESR25JZPJ104. 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 Charge Controller KiCad files?
From the UWCubeSat/BMS-EPS-HS2 repository on GitHub, at the commit this page was made from: the board is hardware/Charge Controller Files (Parsa)/Charge Controller.kicad_pcb and its schematic hardware/Charge Controller 3.0 Files (Michael_Sky)/ChargeController3.0/BQ25756E.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Charge Controller design in my own project?
Its repository states no licence, so its author keeps all rights: ask UWCubeSat before reusing the design.