Engineer: I recommend these domestic battery management chips!

BMS chip does not refer to a specific chip, but a collective name for AFE (battery sampling chip), MCU (microcontrol processing unit), ADC (analog-to-digital converter), digital isolator and other products. According to the above statement, there are not many domestic manufacturers that integrate these functions including software systems, but there are several battery management chip manufacturers, which are still very good.

For example, Jiehuat's multi-battery pack monitoring and protection IC, Tormicro BMS protection chip, Xinzhihui coulomb meter's battery management chip, etc. In fact, many people who are doing battery management now have switched from making other chips to making some battery management chips.

In addition, I recommend a domestic single-cell lithium battery protection IC - Shenzhen Chuangxin Micro CM1124. The reason is that like many domestic chips called battery management IC, the price is close to the people, only a few cents per piece, and it does not make large battery systems. , very durable.

CM1124 has a high-precision voltage detection circuit and delay circuit. By detecting the voltage and current of the battery, it can protect the battery from overcharge, over-discharge, and over-current. Protection circuit suitable for single-cell lithium-ion/lithium-polymer rechargeable batteries. The full voltage accuracy is up to plus or minus 25mV. The discharge overcurrent accuracy can reach plus or minus 150mA, the circuit design is simple, the DFN package is small, and the heat dissipation performance is relatively good. It can be made into small products with batteries to meet the current needs for miniaturization of electronic products.

I have used Zhirong's sw3516 chip. This chip supports a variety of mobile phone fast charging protocols, up to 100w.

According to the Datasheet, SW3516 is a highly integrated fast-charging car charger chip that supports fast charging output from any A+C port and supports dual-port independent current limiting. It integrates a 5A high-efficiency synchronous buck converter, supports multiple fast charging protocols such as PPS/PD/QC/AFC/FCP/SCP/PE/SFCP/low-voltage direct charging, CC/CV mode, and dual-port management logic. Only a small number of peripheral components are needed to form a complete high-performance multi-fast charging protocol car charging solution. Suitable for car chargers, adapters, and power strips.

I have used a lithium battery charging chip Nanjing Weimeng [ME4069]. It is a single chip and is suitable for writing equipment. The price is also cheap, only 1 meter+. The current product test stability is not bad.

According to the Datasheet, ME4069 is a lithium battery charge management chip with constant current and constant voltage charging mode. A single cell (4.2V) lithium battery can be charged quickly and efficiently. It uses a current mode PWM step-down switching control structure to provide a miniature, simple and efficient solution for fast charging of lithium batteries.

ME4069 has a built-in anti-backflow function, so in actual applications, there is no need to connect a diode to the input terminal to prevent backflow. System costs are greatly reduced. The chip has a built-in overvoltage protection function. When the VIN voltage of the chip exceeds 6V, the chip shuts down. At this time, the VIN terminal of the chip can withstand a voltage of 6V.

ME4069 uses an external Sense resistor to set a high-precision charging current, and an internal voltage divider resistor and a precise reference voltage to set the battery's floating charge voltage at 4.2V with an accuracy of up to ±1%. When the input power is removed, the chip will automatically enter a low-current sleep mode, and the battery leakage current is as low as 1μA. When the charging cycle is over, if the voltage of a single battery drops to 4.1V, the chip will automatically recharge the battery. Suitable for charging devices, portable laptops, handheld devices.

Shanghai Nanxin Semiconductor's SC8102 is very suitable for use as a car charger. It is specially designed for charging mobile phones. It has 6~30V input; 5V fixed voltage output, up to 6A. The maximum efficiency can reach more than 93.5%. It integrates MOS and adds some capacitors and resistors outside. An inductor is sufficient, and debugging is very convenient. Our company has already used it in batches.

According to the Datasheet, the SC8102 is a synchronous dual output port buck converter with input voltages ranging from 4.6V to 36V. The SC8102 regulates the output voltage at a fixed 5V or a custom voltage by setting the voltage divider resistors while providing high-precision output current limit. If either of the two output channels reaches the programmed current limit, the converter enters constant current (CC) mode. The total output power can be programmed through a resistor, making constant power (CP) control easy.

SC8102 adopts fixed line drop compensation, programmable frequency setting and working mode selection for PWM and PFM. It has the smallest external components and can realize the maximum functions of different user applications. SC8102 also supports complete protection, including under-voltage protection, over-voltage protection, short-circuit current protection, automatic restart, and over-temperature protection. The SC8102 is available in a 32-pin QFN 5x5 package.

Shengbang Micro's SGM4056 has low power consumption and is easy to use. With charging indication function, battery leakage current is <1μA when the charger is disabled or the input is floating.