CST5023 Introduction:
CST5023 is a dual series battery balancing charging chip with a built-in maximum 1A linear charging and series parallel switching circuit, which can achieve balanced charging of two series batteries.
CST5023 has three complete charging processes: trickle charging (TC), constant current (CC), and constant voltage (CV) charging; The trickle charging (TC) stage can pre charge and restore fully discharged batteries; Safely provide step-down fast charging in constant current (CC) mode; The constant voltage (CV) charging mode in the final stage ensures safe reaching of full battery capacity.
CST5023 integrates series parallel switching MOS, with a conducting internal resistance of 150m Ω for single channel switching MOS. It can switch two series of batteries to a single battery for charging; The control timing for switching MOS is implemented by hardware, with high switching reliability;.
CST5023 supports voltage difference detection between two series of batteries. If the voltage of two batteries is greater than 30mV, the low voltage battery will be charged first to ensure balanced charging of the two batteries;
CST5023 supports one LED charging status indicator pin and two battery status indicator pins. When switching to the corresponding battery, B1-SAT and B0-SAT will output a high level to indicate that the battery is currently connected;
CST5023 has an input undervoltage protection function, which can intelligently adjust the charging current, adapt to the load capacity of the adapter, and prevent the adapter from hanging up.
CST5023 adopts ESOP8 packaging.
CST5023 Features:
* Full charge voltage: 4.2V, supports customized full charge voltage range:
4.05V~4.4V (step=50mV)
* Support customized lithium iron phosphate batteries, full charge voltage range:
3.5V~3.8V (step=50mV)
* Charging current 500mA, supports customized charging current range:
20mA~1A (step=20mA).
* Full charge stop detection current is 50mA
* Trickle current is 1/5 of constant current
* Built in switching MOS, with a single conducting internal resistance of 150m Ω
* Supports voltage difference detection between two battery strings, achieving balanced charging
* Two state indication output pins
* Switching MOS withstand voltage greater than 10V, supporting negative pressure resistance
* Switching timing hardware implementation, high reliability
* Low standby power consumption, battery BAT power consumption less than 3uA
* Supports LED charging status indication function and constant current function (can eliminate LED current limiting resistor)
* Supports multiple protection functions: IC over temperature protection, input under voltage protection, input over voltage protection
* ESD 4KV
CST5023 Application:
* Charging two series of lithium batteries
CST5023 Simplified schematic:
CST5023 Pin Definition:
CST5023 Block Diagram Structure:
CST5023 Typical application schematic diagram:
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