4 layers103.5 × 85 mm
LTC3 Charge Controller
psas/launch-tower
CAD files and software for the launch tower computer (LTC)
450 parts19
4 layers205.5 × 152 mm
CAD files and software for the launch tower computer (LTC)
- Size
- 205.5 × 152 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 507
- Nets
- 106
- Pads
- 968
- Tracks, vias
- 1,136, 121
- Pours
- 14
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 23 Feb 2013
- Updated
- 22 May 2026
Overview
LTC3 is an open-source printed circuit board by psas, from the psas/launch-tower repository on GitHub. It is a 4-layer board of 205.5 × 152 mm with 507 parts on 106 nets, routed with 1,136 tracks and 121 vias.
It is built around the PTN78020HAH, PTN78020WAH and CAT24C256LI, with the CD74HC14E, LTC2991IMS and SN65220DBV among its other parts. Its parts include 67 resistors, 28 capacitors, 17 ICs, 15 transistors and 15 connectors.
Main components
11PTN78020HAH
DIP,38.1x22.1mm-40℃~+85℃ 1 11.85V~22V 15V~36V 330uF 550kHz 6A 96% Buck Overheat protection、Over Current Protection、Under Voltage Protection ±2% DIP,38.1x22.1mm DC-DC Power Modules ROHSTexas InstrumentsDC-DC Power Modules
PTN78020WAH
DIP-7DC-DC ConvertersTexas Instruments
CAT24C256LI
PDIP-81,000,000 cycles 1.8V~5.5V 100 Years 256Kbit 400kHz 5ms Hardware write protection function、Noise suppression function、Built-in power-on reset (POR) I2C PDIP-8 EEPROM ROHSonsemiEEPROM
CD74HC14E
PDIP-14-55℃~+125℃ 1.5V~4.2V 23ns@6V,50pF 2V~6V 2uA 300mV~1.2V 5.2mA 5.2mA 6 74HC Noise suppression function Push-pull Schmitt trigger PDIP-14 Inverters ROHSTexas InstrumentsInverters
LTC2991IMS
MSOP16Octal I2C Voltage, Current, and Temperature MonitorAnalog DevicesUncategorised
SN65220DBV
SOT-23-6-40℃~+85℃ 1 1uA 35pF 6V 7V 7V IEC 61000-4-2 TVS SOT-23-6 ESD and Surge Protection (TVS/ESD) ROHSTexas InstrumentsESD And Surge Protection (TVS/ESD)
SN74AHC1G08DBV
SOT-23-5-55℃~+125℃ 1 1.5V~3.85V 1.9V~2V、2.9V~3V、3.8V、4.4V~4.5V 1uA 2 2V~5.5V 440mV 500mV~1.65V 7.9ns@5V,50pF 74AHC Series 8mA 8mA AND Gate SOT-23-5 Logic Gates ROHSTexas InstrumentsLogic Gates
PMV45EN2R
SOT-23-55℃~+150℃ 1 N-channel 1.115W 17pF 209pF 2V 30V 42mΩ@10V 5.1A 6.3nC@10V SOT-23 MOSFETs ROHSNexperiaMOSFETs
CDSU4148
0603-40℃~+125℃ 150mA 150mW 1V@50mA 2.5uA@75V 4ns 75V 0603 Switching Diodes ROHSComchipSwitching DiodesBSS138
SOT-23-55℃~+150℃ 1 N-channel 1.1Ω@10V、1.2Ω@4.5V 1.2V 1.7nC@10V 17.5pF 340mA 350mW 50V 6.5pF N-Channel SOT-23 MOSFETs ROHShongjiachengMOSFETs
RJ45
TH-12PTH-12P SMT ROHSJLCPCB AssemblyUncategorised
Parts
507| Qty | Value | Footprint | References |
|---|---|---|---|
| 20 | 10k | Resistors_SMD:R_0805 | R209, R210, R213, R214, R402, R405, R409, R414, R416, R417, R418, R421, R505, R506, R511, R512 +4 |
| 13 | PMV45EN | TO_SOT_Packages_SMD:SOT-23 | Q401, Q402, Q403, Q404, Q405, Q501, Q502, Q503, Q504, Q601, Q602, Q603, Q604 |
| 12 | TEST | Measurement_Points:Test_Point_2Pads | W201, W203, W205, W301, W302, W401, W402, W403, W404, W405, W406, W407 |
| 9 | 1μ | Capacitors_SMD:C_0805 | C201, C204, C211, C217, C404, C501, C502, C503, C504 |
| 9 | TLP3542 | Housings_DIP:DIP-6_W7.62mm | U404, U501, U502, U503, U504, U601, U602, U603, U604 |
| 8 | 270 | Resistors_SMD:R_0805 | R501, R502, R507, R508, R601, R602, R605, R606 |
| 8 | 4.7μ | Capacitors_SMD:C_0805 | C206, C207, C208, C209, C212, C213, C214, C215 |
| 8 | MOMENTARY | Buttons_Switches_SMD:SW_SPST_EVQQ2 | SW501, SW502, SW503, SW504, SW601, SW602, SW603, SW604 |
| 6 | CDSU4148 | Diodes_SMD:SOD-523 | D201, D202, D203, D401, D402, D404 |
| 5 | 0.1μ | Capacitors_SMD:C_0805 | C205, C301, C403, C405, C406 |
| 5 | 100 | Resistors_SMD:R_0805 | R406, R609, R610, R611, R612 |
| 5 | 5.6k | Resistors_SMD:R_0805 | R301, R302, R303, R304, R410 |
| 4 | 51k | Resistors_SMD:R_0805 | R503, R504, R509, R510 |
| 4 | Pin Head 1x2 | Pin_Headers:Pin_Header_Straight_1x02 | JP301, P204, P205, P206 |
| 4 | Pin Head 1x3 | Pin_Headers:Pin_Header_Straight_1x03 | JP601, JP602, JP603, JP604 |
| 3 | 0 | Resistors_SMD:R_0805 | R423, R424, R425 |
| 3 | 470μ | Capacitors_ThroughHole:C_Radial_D16_L25_P7.5 | C203, C210, C216 |
| 3 | 60m | Resistors_SMD:R_2512 | R201, R203, R205 |
| 3 | MicroFit header | Connectors_Molex:Molex_Microfit3_Header_02x04_Straight_43045-0828 | P501, P502, P601 |
| 3 | XH header | Connectors_JST:JST_XH_B04B-XH-A_04x2.50mm_Straight | P303, P304, P406 |
| 2 | 100k | Resistors_SMD:R_0805 | R403, R415 |
| 2 | 20k | Resistors_SMD:R_0805 | R207, R208 |
| 2 | 240 | Resistors_SMD:R_0805 | R412, R420 |
| 2 | 36k | Resistors_SMD:R_0805 | R211, R212 |
| 2 | 5.1k | Resistors_SMD:R_0805 | R419, R422 |
| 2 | 62k | Resistors_SMD:R_0805 | R401, R411 |
| 2 | BSS138 | TO_SOT_Packages_SMD:SOT-23 | Q202, Q203 |
| 2 | MicroFit header | Connectors_Molex:Molex_Microfit3_Header_02x02_Straight_43045-0428 | P201, P401 |
| 2 | MicroFit header | Connectors_Molex:Molex_Microfit3_Header_02x01_Straight_43045-0228 | P402, P404 |
| 2 | PTN78020H | LTC3:PTN78020W | U203, U204 |
| 2 | RED | LEDs:LED_1206 | D403, D405 |
| 2 | RELAY_1C | LTC3:G5LE-14 | K401, K402 |
| 1 | 1.5k | Resistors_SMD:R_0805 | R413 |
| 1 | 10μ | Capacitors_SMD:C_0805 | C401 |
| 1 | 120 | Resistors_SMD:R_0805 | R404 |
| 1 | 2.2μ | Capacitors_SMD:C_1210 | C202 |
| 1 | 2.87k | Resistors_SMD:R_0805 | R206 |
| 1 | 21k | Resistors_SMD:R_0805 | R202 |
| 1 | 3.3V | Diodes_SMD:SOD-323 | D406 |
| 1 | 383k | Resistors_SMD:R_0805 | R204 |
| 1 | 500k | Resistors_SMD:R_0805 | R407 |
| 1 | BeagleBone_Black_Expansion_Header_P8 | Pin_Headers:Pin_Header_Straight_2x23 | P301 |
| 1 | BeagleBone_Black_Expansion_Header_P9 | Pin_Headers:Pin_Header_Straight_2x23 | P302 |
| 1 | CAT24C256 | Housings_SSOP:TSSOP-8_4.4x3mm_Pitch0.65mm | U301 |
| 1 | CD74HC14 | Housings_SSOP:TSSOP-14_4.4x5mm_Pitch0.65mm | U401 |
| 1 | LTC2991 | LTC3:MSOP-16 | U202 |
| 1 | MicroFit header | Connectors_Molex:Molex_Microfit3_Header_02x05_Straight_43045-1028 | P408 |
| 1 | NP | Capacitors_SMD:C_1206 | C402 |
| 1 | NP | Resistors_SMD:R_0805 | R408 |
| 1 | PTN78020W | LTC3:PTN78020W | U201 |
| 1 | RJ45 | LTC3:RJ45_8_SHIELDED | J401 |
| 1 | SN65220DBV | TO_SOT_Packages_SMD:SOT-23-6 | U402 |
| 1 | SN74AHC1G08 | TO_SOT_Packages_SMD:SC-70-5 | U403 |
| 1 | XH header | Connectors_JST:JST_XH_B02B-XH-A_02x2.50mm_Straight | P202 |
The 181 most common of 507 parts.
Questions
How big is the LTC3 PCB?
It measures 205.5 × 152 mm and has 4 copper layers, 1.6 mm thick.
What parts does the LTC3 use?
507 parts, built around the PTN78020HAH, PTN78020WAH, CAT24C256LI and CD74HC14E. 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 LTC3 KiCad files?
From the psas/launch-tower repository on GitHub, at the commit this page was made from: the board is ltc3/kicad/ltc/LTC3.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the LTC3 design in my own project?
Its repository states no licence, so its author keeps all rights: ask psas before reusing the design.
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