The PST4056-42-ESOP8 is an energy system-on-chip (ESOP) from Phaetonsemi that integrates power management and battery management functions in a single package. This device is specifically designed for battery-powered consumer electronic applications such as notebooks, tablets, and smart phones. It has an input voltage range from 4.0V to 6.5V and allows the system to operate from a single cell or dual cell lithium-ion/polymer battery cell. The features this chip provides includes an output current of up to 4.5A, up/down buck/boost conversion, programmable output voltage up to 5.4V and programmable input current limit of 1.2A. Additionally, the device includes a slew rate control, temperature protection, low quiescent current, and programmable delay time. It is RoHS compliant and is available in an 8-pin ESOP package.