Southchip announced the launch of SC5617E, a lithium battery protection chip with control pins designed to solve the application pain points of silicon anode batteries. SC5617E is tailored for single-cell lithium battery charging and discharging, offering three major advantages: high precision, low power consumption, and intelligent control. It provides a smarter, more efficient, safer, and more accurate BMS (Battery Management System) solution for single-cell battery packs in mobile devices such as smartphones and tablets.
Multiple Modes for Full Lifecycle Battery Safety Protection
Battery safety is crucial for the reliable operation of electronic devices. During charging and discharging, if the voltage cannot be adjusted in real-time based on the system's status, lithium batteries are prone to overcharging or over-discharging, which can create safety hazards and reduce their lifespan. For silicon anode batteries, most BMS chips shut down based on the undervoltage point of conventional graphite batteries, leading to underutilization of energy in the low-voltage region. Conversely, lowering the undervoltage point directly may cause battery swelling.
SC5617E can monitor the battery pack's current and voltage in real-time and dynamically adjust the undervoltage point via the CTRL pin. This not only ensures safety throughout the entire charging and discharging cycle but also fully utilizes the energy in the low-voltage region of silicon anode batteries. The chip monitors the battery pack voltage by measuring the voltage drop between the VDD and VSS pins, monitors the battery pack current by measuring the voltage drop between the CS and VSS pins in conjunction with an external current-sensing resistor, and monitors the charger and load connection status via the VM pin to implement the logic selection of different safety modes. The chip supports five modes: normal mode, over voltage mode, under voltage mode, discharge over current mode, and charging over current mode. It switches between these modes by controlling the turn-on and turn-off of the charge and discharge FETs. Additionally, Southchip offers the general-purpose lithium battery protection chips SC5617A and SC5617F, which support zero-volt charge prohibition and allowance functions to meet different application scenarios for customers.
Diverse Options Highlighting Superior Performance
SC5617E boasts three core advantages: high precision, low power consumption, and intelligent control.
High-precision current and voltage measurement is the foundation for efficient protection. By collecting voltage and current information, SC5617E can accurately identify abnormal conditions during battery operation, enhancing the safety and stability of the device. The chip consumes only 2.4μA of power, with standby power consumption as low as 0.46μA. This not only extends battery life but also meets the needs of power-sensitive devices such as wearable devices. Moreover, SC5617E integrates powerful intelligent control functions. Through the external control pin CTRL, it can not only dynamically adjust the undervoltage point but also flexibly control the chip to enter different working modes.
SC5617E provides two sets of control functions:
Function set A: Secondary UV mode + Ship mode + Shutoff mode
Function set B: Charging off mode
In ship mode, the discharge function is disabled to reduce self-discharge during transportation, extending battery storage time with power consumption as low as 80nA. In charging off mode, the charging function is disabled, suitable for applications such as parallel charging in foldable phones. In shutoff mode, both discharge and charge functions are disabled, allowing for motherboard power consumption testing on the production line. These control functions meet the diverse needs of different devices in various usage scenarios.
