Soundcore K20i is equipped with a 13mm dynamic driver and supports bass enhancement technology (BassUp). 22 EQs are preset in the app to meet the preferences of different users. It supports AI call noise cancelling to effectively isolate noisy ambient sound. It supports low latency gaming and IPX5 waterproof level. The single battery life is up to 6 hours, and the comprehensive battery life is up to 36 hours.
We have previously teardown the Soundcore products including: Soundcore P30i, Soundcore Sport X20, Soundcore Liberty 3 Pro, Soundcore Liberty Air 2 Pro, Soundcore Life P3, Soundcore R100, Soundcore Life Dot 2, Soundcore LIFE P2 MINI, Soundcore Liberty 2 Pro, Soundcore Liberty Air 2, Soundcore Spirit Pro, etc.
01/ Soundcore K20i Charging Case Teardown
Pry open the charging case shell and take out the charging bin. There are two square magnets at the bottom of the charging bin to fix the earbuds. The battery and motherboard are set inside the cavity.
Take out the battery and solder the battery wire to the motherboard – the motherboard is fixed with screws.
Main circuit inside the charging case.
The circuit on one side of the charging case motherboard.
The circuit on the other side of the charging case motherboard.
INJOINIC IP5521S 30V high-voltage TWS charging bin management SOC is a multi-function power management SoC that integrates a boost converter, lithium battery charging management, and battery power indication, providing a complete power solution for the TWS charging case. The high integration and rich functions of IP5521S require only a few peripheral devices when applied, effectively reducing the size of the overall solution and reducing BOM costs.
IP5521S has a built-in synchronous rectifier boost DC-DC, built-in power tube, providing a maximum output current of 300mA, and a boost efficiency of up to 92%. The switching frequency of the DC-DC converter is 1.5MHz, which can support low-cost inductors and capacitors. The linear charging of IP5521S provides a maximum charging current of 500mA, and the maximum charging current can be flexibly configured. Built-in chip temperature protection and input voltage intelligent adjustment of charging current.
IP5521S can realize independent detection of TWS earbuds, and automatically enter the charging mode after detecting that the earbuds enter the charging case. The earbuds automatically enter the sleep state after being fully charged, and the quiescent current can be reduced to 25uA. IP5521S supports 1/2/3/4 LED lights for power display.
Power management chip peripheral power inductor.
iCM CM1125-BBC integrated MOSFET single-cell lithium battery protection IC to realize overcharge, over-discharge and over-current protection of the battery.
The metal dome for charging the earbuds has a sponge pad at the bottom.
Four LED lights provide light for the bar indicator.
The built-in lithium battery in the charging case is protected by high-temperature insulating tape. The battery cell is labeled with a product label – rechargeable lithium-ion battery, model: 13450HV, nominal voltage: 3.8V, rated capacity: 700mAh, rated energy: 2.66Wh, charging limit voltage: 4.35V, manufacturer: Dongguan PATL Technology Co., Ltd.
02/ Soundcore K20i EarbudsTeardown
Disassemble the earbud cavity. There is a speaker inside the front cavity and a battery inside the back cavity.
Take out the speaker.
On the back of the speaker, there is a tuning hole on the edge, which is protected by a silk screen.
After actual measurement, the diameter of the speaker is about 13mm.
Take out the battery inside the back cavity. The built-in soft-pack button battery model: 1145, rated capacity: 43mAh 0.166Wh, nominal voltage: 3.85V.
Remove the tail plug at the bottom of the earbud stem.
Take out the internal bracket and bluetooth antenna of the earbud stem.
One side of the bracket is affixed with a bluetooth antenna and a touch detection patch. The other side fixes the motherboard unit.
Take off the motherboard, and the microphone pickup hole on the right end of the bracket is sealed with a rubber cover.
The circuit on one side of the earbud motherboard.
The circuit on the other side of the earbud motherboard.
JL JL7003D8 bluetooth audio SoC, used for wireless connection and audio data processing.
Sunlord SDCL0603Q series multilayer ceramic inductors achieve high Q value and high self-resonant frequency (SRF) through carefully designed coils and electrodes. Made by multilayer dry process, it can provide high-precision and high-consistency products to meet the stringent requirements of precision electronic components.
Laser carving R458 17MQ MEMS microphone, used for voice call function pickup.
iCM CM1124 series integrated lithium battery protection IC.
Metal dome sheet connecting bluetooth antenna and touch detection patch.
Laser carving YL240 crystal oscillator, providing clock for bluetooth chip.
All components of Soundcore K20i true wireless earphones.
03/ Summary
The charging case has a built-in 700mAh lithium battery from PATL. The motherboard is equipped with the INJOINIC IP5521S TWS charging case management SOC, which supports 30V high voltage resistance, integrates boost converter, lithium battery charging management, battery power indicator and other functions, providing a complete power solution for the charging case. The iCM CM1125-BBC integrated MOSFET single-cell lithium battery protection IC is used to protect the battery charge and discharge.
The earbuds are equipped with a 13mm dynamic driver and a 43mAh soft-pack button battery. The motherboard unit is set inside the earbud stem, equipped with JL JL7003D8 bluetooth audio SoC, iCM CM1124 series integrated lithium battery protection IC, and Sunlord SDCL0603Q series multilayer ceramic inductor, etc.
PS: Translated from 52audio
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