2 layers40.1 × 40.1 mm BATPOWER04, the printed circuit board in 3D

BATPOWER04

High-efficiency step-down converter based on the LM3485 PFET buck controller. Input voltage range is 4.5 V to 16 V. Output voltage can be selected by jumpers as 3.3 V or 5 V, or configured as a custom voltage using an external resistor.

Open in PCBKit

Size: 40.1 × 40.1 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 31
Nets: 15
Pads: 80
Tracks, vias: 150, 35
Pours: 6
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 5 Apr 2022
Updated: 12 May 2026

Overview

BATPOWER04 is an open-source printed circuit board by mlab-modules, from the mlab-modules/BATPOWER04 repository on GitHub. It is a 2-layer board of 40.1 × 40.1 mm with 31 parts on 15 nets, routed with 150 tracks and 35 vias.

It is built around the LM3485MM, 15MQ040N and IRF7416T. Its parts include 13 connectors, 7 capacitors, 5 resistors, 2 diodes and 1 IC. It belongs with the power boards of this library.

Main components

README

README.md

BATPOWER04 - Step-down Voltage Converter Module

BATPOWER04 is a step-down voltage converter module based on the LM3485 PFET buck controller. The input voltage range is 4.5 V to 16 V. The output voltage can be selected by jumpers as 3.3 V or 5 V, or configured as a custom voltage using an external resistor or trimmer. The output voltage range is 0.25 V to Vin.

The module is especially suited for battery-powered applications, but it can also be used as a step-down converter from an external 12 V supply to 3.3 V or 5 V for MLAB designs. Its key feature is high efficiency, up to 93%, which helps reduce waste heat.

BATPOWER04 module

Parameter	Value	Description
Step-down controller	LM3485	PFET Buck controller
Vin	4.5 V - 16 V	Input voltage range
Vout	0.25 V - Vin	3.3 V or 5 V selectable by jumper. Other values require an external resistor or trimmer.

Parts

Qty	Value	Footprint	References
4	_	Dira:MountingHole_3mm	P1, P2, P3, P4
3	JUMP2_2x1	Hrebinky:Pin_Header_Straight_1x02	J4, J5, J6
2	100uF	MLAB_C:TantalC_SizeD_Reflow	C6, C7
2	CONN1_1	MLAB_CON:WAGO256	J2, J3
2	JUMP_4X2	Hrebinky:Pin_Header_Straight_2x04	J1, J9
1	-	MLAB_R:SMD-0805	R5
1	100nF	MLAB_R:SMD-0805	C2
1	100pF	MLAB_R:SMD-0805	C4
1	11k	MLAB_R:SMD-0805	R4
1	15MQ040N	MLAB_D:Diode-SMA_Standard	D2
1	1nF	MLAB_R:SMD-0805	C3
1	20k	MLAB_R:SMD-0805	R2
1	22k	MLAB_R:SMD-0805	R1
1	22uH DE1207-22	MLAB_L:DE1205-10	L1
1	33k	Resistors_SMD:R_0805	R3
1	470pF	MLAB_R:SMD-0805	C5
1	47uF	MLAB_C:TantalC_SizeC_Reflow	C1
1	IRF7416	MLAB_IO:SO-8	Q1
1	LM3485	MLAB_IO:MSOP-8_3x3mm_Pitch0.65mm	U1
1	LOGO	graphics:QR_code	G***
1	M4	MLAB_D:Diode-SMA_Standard	D1
1	Vout+	MLAB_CON:WAGO256	J7
1	Vout-	MLAB_CON:WAGO256	J8

Questions

How big is the BATPOWER04 PCB?

It measures 40.1 × 40.1 mm and has 2 copper layers, 1.6 mm thick.

What parts does the BATPOWER04 use?

31 parts, built around the LM3485MM, 15MQ040N and IRF7416T. 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 BATPOWER04 KiCad files?

From the mlab-modules/BATPOWER04 repository on GitHub, at the commit this page was made from: the board is hw/sch_pcb/BATPOWER04.kicad_pcb and its schematic hw/sch_pcb/BATPOWER04.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the BATPOWER04 design in my own project?

Its repository states no licence, so its author keeps all rights: ask mlab-modules before reusing the design.

Category and platform

Power

Topics

battery-power buck mlab power-supply step-down batpower high-effeciency lm3485 buck-converter mlab-module

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/mlab-modules-batpower04" title="BATPOWER04 in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/mlab-modules-batpower04.jpg" alt="BATPOWER04" width="1200" height="900">

A picture that opens the board, for a README

[![BATPOWER04](https://pcbkit.io/embed/boards/mlab-modules-batpower04.jpg?size=s)](https://pcbkit.io/boards/mlab-modules-batpower04)

Source

Repository: mlab-modules/BATPOWER04
Board file: hw/sch_pcb/BATPOWER04.kicad_pcb
Commit: aa6e86a
Homepage: mlab.cz/module/BATPOWER04
Licence: Not stated

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