Introduction

As the demand for the safety of power tools continues to rise, an increasing number of power tools are utilizing lithium iron phosphate (LiFePO4) batteries for power supply. However, currently, the majority of lithium battery management chips on the market are designed for ternary lithium batteries and are not well-suited for LiFePO4 batteries.

ChargerLAB has discovered that iSmartWare has recently released a multi-protocol buck-boost chip, the SW6301V, which is suitable for 2-7 cell LiFePO4 batteries. It supports a maximum input/output power of 100W, featuring dynamic power management, multiple protection mechanisms, integrated battery level indication and display, as well as button support, providing users with a more intuitive understanding of the tool's status. This not only meets the technical requirements of power tool manufacturers but also actively responds to users' expectations for higher performance and more intelligent power tools.

Advantages of LiFePO4 Batteries

Li-ion batteries consist of positive electrode material, negative electrode material, separator, and electrolyte, primarily classified based on the positive electrode material. In the field of energy storage, the widely used types are LiFePO4 batteries and ternary lithium batteries.

Compared to ternary lithium batteries, LiFePO4 batteries are more stable and less prone to fire or explosion in situations such as short circuits, compression, and punctures. LiFePO4 batteries also exhibit excellent fast-charging characteristics, supporting high-rate charge and discharge of 3C~5C, with stronger tolerance to overcharging and overdischarging.

The positive electrode in LiFePO4 batteries is primarily composed of iron, with a lower proportion of heavy metals and rare metals. This not only reduces costs but also minimizes toxicity, resulting in less environmental pollution. Additionally, LiFePO4 materials have a long lifespan, with the capacity remaining above 80% after at least 1500 cycles.

iSmartWare SW6301V

The iSmartWare SW6301V is a highly integrated multi-protocol buck-boost power bank System on Chip (SoC), featuring dual-mode buck-boost controllers that support efficient charging and discharging. Specifically, it can charge 2-6 cell lithium batteries or 2-7 cell LiFePO4 batteries, providing comprehensive charging cycle management.

The iSmartWare SW6301V is compatible with 4.2V/4.3V/4.35V/4.4V ternary batteries and 3.65V LiFePO4 batteries. It has an input voltage range of 4 to 26V, an output voltage range of 3.3 to 26V, and a 10mV voltage regulation step. Users can configure charging and discharging power through external PINs, with a maximum power of up to 100W.

It also integrates high-precision battery level indication and display functionality, with a built-in coulomb counter and 12-bit ADC for accurate calculation of the current battery level. It supports dual-chip battery metering and is compatible with various digital displays and LED indicators.

The SW6301V supports button functions, recognizing short presses, double presses, and long presses. It also supports low-current mode and features a controllable output port and WLED switch function. At 14.8V, the standby power consumption is less than 50μA. External pins can be configured for input power/output power, and more.

It also supports various fast charging protocols, including PD3.1, SVOOC, VOOC4.0, SCP, FCP, AFC, QC3+, UFCS, BC1.2, and comes with multiple protection mechanisms, including NTC over-temperature protection.

With VBUS and VBAT withstand voltages exceeding 32V, and DPDM and CC withstand voltages exceeding 28V, the chip-level HBM is greater than 2KV. It adopts a QFN40 package with dimensions of 5mm x 5mm x 0.4 pitch, making it compact and suitable for applications in power banks, portable power stations, and other fields.

This is a demo featuring the iSmartWare SW6301V, and ChargerLAB may further analyze this solution in detail in the future. Stay tuned for more information.

Summary of ChargerLAB

In conclusion, the advent of the iSmartWare SW6301V marks a significant stride in catering to the evolving needs of power tool safety and efficiency. Its tailored compatibility for LiFePO4 batteries, coupled with its diverse functionalities and robust safety features, not only meets industry demands but also aligns with users' aspirations for high-performance, intelligent power tools. This innovation stands as a testament to the continual advancement in battery management technology, promising safer, smarter, and more efficient power solutions for diverse applications. Stay tuned as ChargerLAB delves deeper into unraveling the potential of this groundbreaking solution.

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