aw4rj4pdt

BQ40Z50 Ultra-Mini Battery Management Module

Overview

The project has been verified by the original poster and is feasible
based on the BQ40Z50, with the size compressed to the limit. This resulted in the elimination of the chemical fuse.
A four-layer board was used to enhance current capability and ensure a complete ground plane. However, theoretically, downgrading to a two-layer board is still feasible.
Due to the complexity of BQstudio settings, this is still under investigation.

Because the BQ40Z50 uses impedance tracking, the wire loss of the battery connection will affect the power metering. It is recommended to use thicker wires to connect to the battery and use Kelvin wiring. Alternatively, replace it with a pin-to-pin compatible BQ4050 that does not use impedance tracking.

The battery
short-circuit current is enormous; extreme caution must be exercised during soldering to avoid short circuits!!!
In

the schematic, R9-R12 are temperature sensing resistors; at least one must be used, and it needs to be short-circuited when not in use.

Design Files

All reference designs on this site are sourced from major semiconductor manufacturers or collected online for learning and research. The copyright belongs to the semiconductor manufacturer or the original author. If you believe that the reference design of this site infringes upon your relevant rights and interests, please send us a rights notice. As a neutral platform service provider, we will take measures to delete the relevant content in accordance with relevant laws after receiving the relevant notice from the rights holder. Please send relevant notifications to email: bbs_service@eeworld.com.cn.

It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

Hot

Technical Resources More

Search Datasheet?

Supported by EEWorld Datasheet

Technical Videos More

Forum More

Update:2026-03-26 19:13:29

[Original] STM32 HD7279A interface program
I don't know why. Many people on the Internet say that STM32 can't drive 7279. And I can't find a routine. In fact, after checking the data sheet and writing the timing, this interface is very easy.
Help! I want to choose a larger RAM, what solution should I use?
The requirement is to sample 200 points in a signal cycle of 20ms. For multiple signals, the sampled data needs to be stored in RAM. One signal requires about 1m of space. I am a beginner in single-ch
God bless the truth of the municipal gang fight to be revealed! Oh my god! It's so dark! !
The truth of the Tianyou Municipal Government group fight has been revealed! Oh my god! It's so dark! ! Sina Real Estate News (Editor Zhang Wenwen) At around 8:30 on March 16, a violent beating occurr
I spent 10,000 yuan on advanced PCB lecture courseware (high-frequency circuit wiring skills)
This is a courseware on RF and mixed analog and digital PCB design. I hope it will be helpful to people who are working on high-frequency circuits. It mainly includes: RF PCB layout and mixed analog a
Have you ever encountered confusion in chip selection?
[i=s]This post was last edited by damiaa on 2016-11-16 21:42[/i] [size=5] [color=#808000]When making products, I have to worry about every chip selection[/color][/size] [color=#0000ff]Have you ever en
Ask a question about the display module
Hello, a company has an interview question. It uses Samsung's 128S64AA1 display module and requires the Chinese display signal output to this module to be converted into an English display signal. I d

Datasheet More

Circuits More