Ampere

LtBrain·Ampere·ampere/ampere.kicad_pcb

About the Ampere PCB

Ampere is an open source STM32 PCB design by LtBrain, published on GitHub under the MIT license. It is a 4-layer board measuring 100 × 65 mm, with 208 components from 79 distinct parts.

Its main chip is the STM32G474RETX, from the STM32 family. Other key parts include the USBLC6-2P6, TPS26750SRSMR, TPD4S480RUKR, CAT24C256 and TPS55289. By type, the board carries 100 capacitors, 59 resistors, 18 ICs, 11 connectors, 7 transistors and 7 diodes.

It belongs with the power & battery designs in this gallery.

From the project

A variable benchtop power supply

This board was created with the intention of streamlining PCB workflows at home without spending that much money on a laboratory grade power supply. It adds features such as USB communication so that a standard PC can talk to this board and monitor outputs while also changing them and providing some waveform generation.

Ampere relies on a STM32G474 chip to orchestrate and control all the power path devices via I2C. This is very useful because it allows a single pair of traces to practically talk with the entire board. However, Ampere does use 3 I2C channels for increased reliability and just…

Ampere, from the project README — From the project README

Main components on the Ampere

USBLC6-2P6 STM32G474RETX TPS26750SRSMR TPD4S480RUKR CAT24C256TPS55289MIC29302WU MCP4725XXX-XCH INA238 LM74502DDFRLMR36520ADDATPS7A91

Ampere bill of materials (BOM)

208 components, 79 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	USBLC6-2P6	SOT-666	U1
1	STM32G474RETX STM32G474RETx	LQFP-64_10x10mm_P0.5mm	U2
1	TPS26750SRSMR	VQFN32_RSM_TEX-L	U3
1	TPD4S480RUKR	RUK0020B-IPC_C	U4
1	CAT24C256	SOIC-8_3.9x4.9mm_P1.27mm	U5
2	TPS55289	CONV_TPS552892RYQR	U6, U8
2	MIC29302WU	TO-263-5_ET_DDPAK_MCH	U7, U9
2	MCP4725XXX-XCH MCP4725xxx-xCH	SOT-23-6	U11, U15
4	INA238	TSSOP-10_3x3mm_P0.5mm	U13, U14, U18, U19
1	LM74502DDFR	SOT65P280X110-8N	U21
1	LMR36520ADDA	Texas_HTSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.95x4.9mm_Mask2.4x3.1mm_ThermalVias	U22
1	TPS7A91	Texas_S-PDSO-N10_EP1.2x2mm	U23
2	BSC040N08NS5	TDSON-8-1	Q1, Q12
2	CSD17484F4	DFN100X60X35-3N	Q6, Q7
1	CSD18543Q3A	VSON-8_3.3x3.3mm_P0.65mm_NexFET	Q8
2	AO4485	SOIC-8_3.9x4.9mm_P1.27mm	Q9, Q10
1	25 MHZ	Crystal_SMD_3225-4Pin_3.2x2.5mm	Y1
1	32.768 KHZ	Crystal_SMD_3215-2Pin_3.2x1.5mm	Y2
2	USB_C_Receptacle	JAE_DX07S024JJ2R1300	J1, J2
1	BUCK2+	SolderWirePad_1x01_SMD_4x8mm	J3

Show 59 more

Qty	Part	Footprint	Refs
1	2x12 IDC	IDC-Header_2x12_P2.54mm_Vertical	J5
1	BUCK2-	SolderWirePad_1x01_SMD_4x8mm	J6
1	BUCK1+	SolderWirePad_1x01_SMD_4x8mm	J7
1	BUCK1-	SolderWirePad_1x01_SMD_4x8mm	J8
1	LDO1_VOUT	SolderWirePad_1x01_SMD_1.5x3mm	J9
1	LDO1_GND	SolderWirePad_1x01_SMD_1.5x3mm	J10
1	LDO2_VOUT	SolderWirePad_1x01_SMD_1.5x3mm	J11
1	LDO2_GND	SolderWirePad_1x01_SMD_1.5x3mm	J12
1	BLUE	LED_0402_1005Metric	D1
2	RED	LED_0603_1608Metric	D2, D3
2	10V	D_SOD-323	D5, D7
2	SMBJ24CA	D_SMB	D6, D8
1	22 ohm	L_0805_2012Metric	FB1
2	4.7UH 4.7uH	L_Changjiang_FXL1360	L1, L2
1	12UH 12uH	L_Changjiang_FNR6040S	L4
35	100NF 100nF	C_0402_1005Metric	C1, C9, C11, C12, C13, C14, C21, C24 +27
1	470NF 470nF	C_0402_1005Metric	C2
1	4.7UF 4.7uF	C_0805_2012Metric	C3
4	10NF 10nF	C_0603_1608Metric	C4, C5, C6, C7
4	10UF 10uF	C_0402_1005Metric	C8, C28, C29, C30
4	10UF 10uF	C_0603_1608Metric	C10, C27, C127, C128
1	220UF 220uF	CP_Elec_8x10	C15
4	18PF 18pF	C_0402_1005Metric	C17, C18, C19, C20
2	220PF 220pF	C_0402_1005Metric	C22, C23
7	1UF 1uF	C_0603_1608Metric	C35, C43, C52, C58, C71, C77, C125
12	10UF 10uF	C_1206_3216Metric	C36, C37, C38, C44, C45, C56, C57, C72 +4
2	4.7UF 4.7uF	C_0603_1608Metric	C46, C59
3	10NF 10nF	C_0402_1005Metric	C47, C60, C126
2	4700PF 4700pF	C_0402_1005Metric	C48, C66
2	100PF 100pF	C_0402_1005Metric	C49, C67
2	68UF 68uF	CP_Elec_8x10	C50, C55
2	100UF 100uF	CP_Elec_6.3x5.8	C51, C76
1	220NF 220nF	C_0603_1608Metric	C104
2	100NF 100nF	C_0603_1608Metric	C115, C118
2	10UF 10uF	CP_EIA-3528-21_Kemet-B	C116, C117
3	22UF 22uF	C_1210_3225Metric	C119, C120, C121
2	4.7UF 4.7uF	C_1210_3225Metric	C122, C123
1	220NF 220nF	C_0805_2012Metric	C124
1	2.2UF 2.2uF	C_1210_3225Metric	C130
10	2.2K	R_0402_1005Metric	R1, R2, R4, R5, R84, R85, R86, R87 +2
4	10K	R_0402_1005Metric	R3, R6, R14, R72
7	100K	R_0402_1005Metric	R7, R15, R28, R29, R37, R41, R78
2	5.1K	R_0402_1005Metric	R12, R13
2	0	R_0402_1005Metric	R20, R27
6	10M 10m	R_1206_3216Metric	R30, R38, R48, R50, R67, R71
8	10	R_0402_1005Metric	R31, R32, R39, R40, R46, R47, R49, R51
2	49.9K	R_0402_1005Metric	R33, R42
2	150K	R_0402_1005Metric	R34, R43
2	27.4K	R_0402_1005Metric	R35, R44
2	2.2K	R_0603_1608Metric	R36, R45
2	9.2K	R_0603_1608Metric	R63, R68
2	1K	R_0603_1608Metric	R64, R69
2	1.56K	R_0603_1608Metric	R65, R70
1	10K	C_0402_1005Metric	R66
1	4K	R_0402_1005Metric	R79
1	100K	R_0603_1608Metric	R80
1	38.2K	R_0603_1608Metric	R81
1	100K	C_0402_1005Metric	R82
1	32.4K	C_0402_1005Metric	R83

Ampere design files

The KiCad project lives in the LtBrain/Ampere repository on GitHub; these links point at the commit this page was built from.

Layoutampere/ampere.kicad_pcb
Schematicampere/ampere.kicad_sch
BOMampere/jlcpcb/production_files/BOM-ampere.csv

Ampere: common questions

What microcontroller does the Ampere use?

The Ampere is built around the STM32G474RETX, from the STM32 family.

How big is the Ampere PCB?

The Ampere measures 100 × 65 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Ampere?

208 components, from 79 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Ampere design files?

From the LtBrain/Ampere repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Ampere design in my own project?

Yes, under the terms of its MIT license, which LtBrain chose for the repository.

Can I test firmware for the Ampere without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

Ampere

About the Ampere PCB

Main components on the Ampere

Ampere bill of materials (BOM)

Ampere design files

Ampere: common questions

What microcontroller does the Ampere use?

How big is the Ampere PCB?

How many components are on the Ampere?

Where can I download the Ampere design files?

Can I use the Ampere design in my own project?

Can I test firmware for the Ampere without the hardware?

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