Micro Source Semiconductor is a world-leading analog chip design company, continuously focusing on the analog chip field centered around power management chips. With global R&D and sales centers, it is dedicated to providing customers with complete power management solutions and technical services, widely applied in battery systems, display systems, wireless communication systems, and personal wearable systems in the 3C market.
The CEO of Micro Source Semiconductor, Dai Xingke, delivered a speech titled “Design of Reconfigurable Parameter Charging Cases” during the 2020 (Autumn) Asian Bluetooth Headphone Exhibition hosted by I Love Audio Network. He pointed out that the current design of charging cases for TWS headphones has issues such as varying understanding of products among solution providers, leading to prolonged product cycles and difficulties in IEC62368 certification. To address this, Micro Source proposed a solution that provides a single-chip solution with reconfigurable parameters.
Micro Source’s currently promoted single-chip solutions feature high integration and good PCB layout, eliminating the hassle of developing MCU software, which can also enhance product quality and reduce the quality gap with brands. In principle, some general MCU solutions may not require more than 50% development, and single-chip solutions are easier to pass certification.
After more than three years of long-term tracking and analysis, I Love Audio Network has studied over 400 popular audio products and found that Micro Source Semiconductor’s seven types of products have been applied in smart audio products, including the TWS charging case multi-in-one single-chip solution, lithium battery charging chips with built-in OVP, over-voltage protection chips, lithium battery charging chips, boost chips, power devices, and backlight driver boost chips used in smart speaker products with screens. In addition, Micro Source has also laid out in many fields including display panels, fast charging protocols, audio amplifiers, etc., with a very rich product line.
Next, let’s take a look at the characteristics and disassembly summary of Micro Source Semiconductor’s power management chips organized by I Love Audio Network. Click on the titles of the disassembly reports to view the complete disassembly reports!
1. TWS Charging Case Multi-in-One Single-Chip Solution
1. LP7801D
Micro Source LP7801D is an ultra-low-power charging/discharging single-chip solution, integrating a linear charging management module and a low-power synchronous boost discharge management module, with a standby current of <10uA (including headphones and protection board) when the entire headphone case is powered on at 5V. It is the first multi-in-one chip in China to pass IEC62368 safety certification.
Micro Source LP7801D adopts ESOP-8 packaging, with built-in OVP, input withstand voltage of 28V, eliminating the need for external over-voltage protection components, and a standby current of 1uA.
Application Cases:
(1) Disassembly Report: Honor Selected MOECEN Sound Earbuds X1 True Wireless Bluetooth Headphones
(2) Disassembly Report: Edifier Xemal Sound True Wireless Headphones X3
(3) Disassembly Report: Edifier MiniBuds True Wireless Headphones
(4) Disassembly Report: Q1 True Wireless Bluetooth Headphones Customized by Qu Pingce × Yuyin
2. LP7801T
Micro Source LP7801T is an ultra-low-power charging boost single-chip solution, designed for small capacity lithium batteries for charging/discharging, integrating a linear charging management module and a low-power synchronous boost discharge management module, with built-in power MOS, external programmable charging current, and a maximum charging current of 1A, with a standby current of <10uA (including headphones and protection board) when the entire headphone case is powered on at 5V.
Micro Source LP7801T adopts ESOP-8 packaging, with built-in OVP, built-in NTC for precise adjustment, input withstand voltage of 36V, eliminating the need for external over-voltage protection components, and a standby current of 1uA; the boost module efficiency can reach 95%, with high switch pin withstand voltage, fixed 5.1V output, few external components, and low ripple.
Application Cases:
(1) Disassembly Report: JLab Go Air True Wireless Sports Headphones
(2) Disassembly Report: Edifier Xemal X5 True Wireless Bluetooth Headphones
3. LP7802A
Micro Source LP7802A is a six-in-one single-chip solution that supports 1A linear charging, synchronous rectification boost discharge, load recognition, control, status indication, and dual-channel independent discharge functions.
Micro Source LP7802A supports independent output for dual-channel charging status, and is a six-in-one dedicated chip for charging cases, with built-in automotive-grade 30V over-voltage protection at the input end, standby power consumption as low as 23uA, supports Hall switch, and full charge cutoff current adjustable to 1mA, with independent recognition and independent charging for left and right ears, achieving a minimalist design without MCU for the entire case, and SSOP16 packaging saving space, making the design of TWS charging cases time-saving and worry-free.
Application Cases:
(1) Disassembly Report: HolyHigh ET2 True Wireless Bluetooth Headphones
(2) Disassembly Report: Lenovo thinkplus TrackPods True Wireless Bluetooth Headphones
2. Lithium Battery Charging Chips with Built-in OVP
1. LP4063
Micro Source LP4063 is an 800mA lithium battery charging IC, with an input withstand voltage of 28V, over-voltage protection of 7V, no need for external over-voltage protection IC, supports battery reverse connection protection, and adopts SOT23 packaging.
Application Cases:
(1) Disassembly Report: Moregy Smart Voice Glasses
(2) Disassembly Report: Skullcandy Sesh True Wireless Bluetooth Headphones
2. LP4069
Micro Source LP4069 is a single-chip high-voltage lithium battery charging IC, with a maximum output current of 800mA, and a maximum withstand voltage of 28V, without the need for input protection components.
Application Cases:
(1) Disassembly Report: QCY T4 True Wireless Bluetooth Headphones
(2) Disassembly Report: QCY T6 True Wireless Sports Headphones
(3) Disassembly Report: Tmall Genie BOOM TWS Smart Speaker
3. LP28013
Micro Source LP28013 is a charging management chip with built-in OVP, with a maximum output current of 1A.
Application Cases:
(1) Disassembly Report: Huawei Mini TWS Bluetooth Speaker
(2) Disassembly Report: Honor Magic Cube TWS Bluetooth Speaker
4. LP28055
Micro Source LP28055 is a 1A lithium battery linear charging IC, with a maximum withstand voltage of 28V, and input over-voltage protection of 7V, used for charging internal batteries in charging cases, with a withstand voltage of 28V, eliminating the need for external input over-voltage protection components.
Application Cases:
(1) Disassembly Report: Realme Buds Q True Wireless Bluetooth Headphones
(2) Disassembly Report: Xiaomi Outdoor Bluetooth Speaker MINI
3. Over-Voltage Protection Chips
1. LP5300
Micro Source LP5300 input over-voltage protection IC, with a maximum input withstand voltage of 36V and 6.1V protection, preventing input over-voltage from damaging internal components of the headphone charging case.
Application Cases:
(1) Disassembly Report: MOMAX BT1 True Wireless Bluetooth Headphones
(2) Disassembly Report: Noise Shots XO True Wireless Bluetooth Headphones
(3) Disassembly Report: TaoTronics SoundSurge 47 Over-Ear Noise-Canceling Bluetooth Headphones
(4) Disassembly Report: PaMu Slide Mini True Wireless Bluetooth Headphones
(5) Disassembly Report: iWalk Sound BTA003 True Wireless Bluetooth Headphones
2. LP5301
LPS Micro Source Semiconductor LP5301, a dual protection chip for over-voltage and over-current with a withstand voltage of 36V, used for charging case input protection.
Application Cases:
(1) Disassembly Report: Edifier TO-U2 True Wireless Bluetooth Headphones
(2) Disassembly Report: Edifier HECATE GM6 TWS Gaming Headphones
(3) Disassembly Report: Edifier LolliPods True Wireless Bluetooth Headphones
(4) Disassembly Report: Xiaomi Xiaoai Bluetooth Speaker Portable Version
(5) Disassembly Report: Xiaomi Bluetooth Speaker Xiaoai Version
(6) Disassembly Report: UGREEN HiTune WS100 True Wireless Bluetooth Headphones
3. LP5305
Micro Source LP5305, an over-voltage and over-current protection chip with a withstand voltage of 26V, supports front-end protection for chargers, monitors battery voltage, preventing input over-voltage from damaging internal components of the headphone charging case while also preventing battery overcharging.
Application Cases:
(1) Disassembly Report: Boltune BT-BH020 True Wireless Bluetooth Headphones
4. LP5306
Micro Source LP5306 is a high-precision over-voltage and over-current protection chip, with adjustable over-current values, effectively protecting against over-voltage and over-current anomalies during power-up and stable operation, preventing damage to back-end chips, while also featuring front-end overcharge protection for battery chargers to prevent high battery voltage that could cause swelling or other issues.
Application Cases:
(1) Disassembly Report: Omthing AirFree True Wireless Bluetooth Headphones
(2) Disassembly Report: Xiaomi True Wireless Bluetooth Headphones Air2 SE
4. Lithium Battery Charging Chips
1. LP4054H
Micro Source LP4054H is a complete single-cell lithium-ion battery constant current/constant voltage linear charger, with an internal MOSFET structure and a maximum charging current of 600mA. It does not require an external current sensing resistor. The charging voltage is fixed at 4.2V, and the charging current can be programmed through a resistor.
Application Cases:
(1) Disassembly Report: Giant Headphone Speaker MK-101
2. LP4055
Micro Source LP4055, SOT23 packaging, 800mA linear lithium battery charging IC.
Application Cases:
(1) Disassembly Report: NetEase Cloud Music MB1 Bluetooth Speaker
(2) Disassembly Report: Ait Meeker E3 True Wireless Headphones
3. LP4055QVF
Micro Source LP4055QVF, using DFN2*2-6 small volume packaging, with a maximum withstand voltage of over 12V, supports small current charging, currently the preferred model for many TWS headphone customers of Micro Source.
Application Cases:
(1) Disassembly Report: White Label AirPods Pro (Hengxuan Version)
4. LP4060
LP4060 charging IC, with a maximum charging current of 800mA, does not require a sensing resistor, with external MOS, reverse connection diode, and simplified peripheral components, used for charging internal batteries in charging cases.
Application Cases:
(1) Disassembly Report: Rimo You BC20 Smart Driving Recorder Rearview Mirror
(2) Disassembly Report: Motorola Verve Buds 800 True Wireless Bluetooth Headphones
(3) Disassembly Report: iWalk Sound BTA003 True Wireless Bluetooth Headphones
5. LP4061
LPS Micro Source Semiconductor LP4061, an 800mA linear lithium-ion battery charger, supports dual LED status indication, with simplified peripheral components, does not require a sensing resistor, and 2x2mm DFN packaging saves space.
Application Cases:
(1) Disassembly Report: QCY T1C True Wireless Bluetooth Headphones
6. LP28056S
Micro Source LP28056S lithium battery charging management IC, ESOP8 packaging, 4.2V charging with 1% accuracy, does not require external sensing resistors and reverse connection diodes, programmable charging current up to 1.2A, with short-circuit protection function, suitable for portable players, MP3s, mobile phones, Bluetooth devices, etc.
Application Cases:
(1) Disassembly Report: GGMM E2 Portable Smart Speaker
5. Boost Chips
1. LP6212A
Micro Source LP6212A, a high-current boost IC with built-in MOS in SOT23-6 small volume packaging, high efficiency, good performance indicators, a flagship product popular in the speaker market, with a high market share.
Application Cases:
(1) Disassembly Report: Suning Little Biu Smart Speaker
2. LP6235
LP6235 is a boost chip with 5V1A current limiting function, with a high switching frequency, suitable for various applications of boosting lithium battery voltage to 5V.
Application Cases:
(1) Disassembly Report: White Label AirPods Pro
3. LP6261
LPS Micro Source Semiconductor’s LP6261, a low-power boost chip with 1uA consumption. It uses SOT23-6 packaging, with a super low power boost of 1.7uA (when powered on at 5V), requiring only three peripherals (1 each of inductor and input/output capacitors); shutdown current <0.1uA, with built-in EN for complete shutdown, and built-in short-circuit protection.
Application Cases:
(1) Disassembly Report: QCY T4 True Wireless Bluetooth Headphones
6. Power Devices
1. LPM2301 PMOS
Micro Source LPM2301 2.6A PMOS, one of the larger current versions in the industry, with sufficient margin to ensure safety, mostly used as a switch in product applications.
Application Cases:
(1) Disassembly Report: OPPO Enco W51 True Wireless Active Noise-Canceling Headphones
(2) Disassembly Report: AUKEY EP-T10 True Wireless Bluetooth Headphones
(3) Disassembly Report: iWALK Sound BTC001 True Wireless Bluetooth Headphones
(4) Disassembly Report: Football/Basketball Shaped True Wireless Bluetooth Headphones
(5) Disassembly Report: Motorola Verve Buds 800 True Wireless Bluetooth Headphones
2. LPM2302 NMOS
Micro Source LPM2302 3.0A NMOS, with a withstand voltage of 20V, SOT-23 packaging.
Application Cases:
(1) Disassembly Report: AUKEY EP-T10 True Wireless Bluetooth Headphones
(2) Disassembly Report: iWALK God of War TWS Gaming Headphones
(3) Disassembly Report: Motorola Verve Buds 800 True Wireless Bluetooth Headphones
3. LP3987H-18
LP3987H-18 is a fixed output LDO with 600mA, large current, small ripple, good transient response, stable performance, and high cost-performance ratio, making it the preferred choice for large current LDOs in various product applications.
Application Cases:
(1) Disassembly Report: Baidu Smart Speaker Big Guy
7. Backlight Driver Boost Chips
1. LP3102
Micro Source LP3102 boost IC, for powering LCD backlights.
Application Cases:
(1) Disassembly Report: Tencent Smart Speaker Dingdang Smart Audio-Visual Screen
2. LP6230
Micro Source LP6230 backlight driver boost IC.
Application Cases:
(1) Disassembly Report: Tmall Genie TG_S2 (CCL) Smart Speaker with Screen
Micro Source News Summary
(1) iPhone 12 does not come with wired headphones; 21 companies with 97 charging case power management chips will benefit.
(2) Interview with CEO Dai Xingke of Innovative Micro Source Semiconductor Co., Ltd.
(3) Micro Source LP7801D charging case single-chip power solution enters Honor Selected supply chain.
(4) Micro Source Semiconductor LP7802A six-in-one single-chip solution for TWS headphone charging cases, no MCU required for minimalist design.
(5) Micro Source Semiconductor LPM2301 PMOS adopted by OPPO Enco W51, ensuring safety with 2.6A high current for charging cases.
(6) Micro Source LP7801T charging case single-chip solution enters JLab supply chain, 5V powered with built-in EN.
(7) Micro Source LP4060 charging IC and multiple PMOS tubes adopted by Motorola, products entering the international market.
(8) Micro Source LP5306 TWS charging case power chip enters Xiaomi supply chain, with adjustable over-current values.
(9) Micro Source LP4069 and LP6261 TWS power chips widely adopted by QCY, product strength once again recognized.
(10) Micro Source LP7801D enters Edifier supply chain, ultra-low power TWS charging case power management solution.
(11) Solution: Micro Source integrates dozens of power solutions applicable to TWS true wireless headphones, sports, and over-ear headphones.
(12) Video: From the perspective of power management, how to design a safe and reliable TWS headphone and headphone case.
I Love Audio Network Summary
Through disassembly and summary, I Love Audio Network has found seven types of Micro Source Semiconductor’s power management solutions in various smart audio products, including:
The TWS charging case multi-in-one single-chip solution that represents future development trends, including the LP7801 series and LP7802 series; lithium battery charging chips with built-in OVP, LP4063, LP4069, LP28013, and LP28055. Over-voltage protection chips from the LP5300 series; lithium battery charging chips, LP4054H, LP4055, LP4055QVF, LP4060, LP4061, and LP28056S; boost chips LP6212A, LP6235, and LP6261.
Power semiconductor devices, LPM2301 PMOS and LPM2302 NMOS, both of which are larger current versions in the industry; high-current LDO LP3987H-18; and backlight driver boost chips suitable for smart speakers with screens, LP3102 and LP6230.
From the brand perspective, Micro Source Semiconductor’s customers include headphone brands Edifier, QCY, Yuyin, Sound Technology, PaMu, and mobile phone brands Xiaomi, OPPO, Huawei, Lenovo, Motorola, Realme, as well as well-known foreign brands JLab, Skullcandy, Boltune, AUKEY, and smart speaker brands Baidu, Tmall Genie, Tencent, etc., with a very wide range of brand customers.
Micro Source Semiconductor’s power solutions focus on enhancing the quality of headphone power management through various means, providing complete power management solutions and technical services for TWS true wireless headphones, sports and over-ear headphones, smart speakers, and other audio products. Currently, Micro Source Semiconductor is developing rapidly, and I Love Audio Network will continue to follow its progress.
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