PST41528

The PST41528 is a battery charger and system power path management device for 2-cell Li-Ion or Li-polymer batteries.Its low-impedance power path optimizes efficiency, reduces battery charging time, and extends battery life. I^2C programming makes it a flexible powering and charger design solution.The PST41528 can detect the input source types which include SDP/CDP/DCP and non-standard adapter through the D+/D- pins following USB BC1.2Specification. The PST41528 features a dynamic power management (DPM) to avoid input adapter overloading or to meet the maximum current limit. It keeps the system voltage regulated to its minimum setting in DPM mode by reducing the charge current. The PST41528 also provides supplement mode to further support system output in case that the charge current decreased to zero and input is still overload. The PST41528can provide the maximum power point with an algorithm called input current optimizer to avoid the input source from overloading.The PST41528 supports the default mode (standalone) without host control. It automatically detects the battery voltage and starts the charge. A charge cycle automatically terminates when a full charge is detected if the device is not in thermal regulation or DPM mode. The charger automatically initiates a new charging cycle if the battery voltage falls below the recharge threshold.The PST41528 supports USB On-The-Go (OTG) operation by supplying default 5.1V on the VBUS with an output current limit up to 2A. The PST41528 provides full protections for safety of battery charging and system operation, including battery temperature monitoring, charging safety timer, over-current and over-voltage protections. When any fault occurs, the PST41528 asserts a nINT pulse to notify the host.The PST41528 is available in a Green WLCSP-2.1×2.1-25B package.