ACT8712

Rev0, 25-Feb-08 Advanced Product Information―All Information Subject to Change ACT8712 Four Channel Integrated Power Management IC for Handheld Portable Equipment FEATURES Multiple Patents Pending Li+ Battery Charger with Integrated MOSFET − Programmable Charge Current up to 1A − ON/OFF Control and Status Indication GENERAL DESCRIPTION The patent-pending ACT8712 is a complete, cost effective, highly efficient ActivePMUTM power management solution that is ideal for a wide range of portable handheld equipment. This device integrates two PWM step-down DC/DC converters, one PWM step-up DC/DC converter with over-voltage protection (OVP) and a full-featured linear-mode Li+ battery charger into a single, thin, space-saving package. An I2C Serial Interface provides programmability for the DC/DC converters and battery charger. REG1 and REG2 are fixed-frequency, current-mode PWM step-down DC/DC converters that are optimized for high efficiency and are capable of supplying up to 550mA and 750mA, respectively. REG3 is a fixed-frequency PWM step-up converter that safely and efficiently biases a string of up to seven white-LEDs for backlighting. The battery charger incorporates an internal power MOSFET for constant-current/constant-voltage, thermally regulated charging of a single-cell Li+ battery. All DC/DC converters’ output voltage are programmable and controllable via the I2C interface. The ACT8712 is available in a tiny 4mm x 4mm 24-pin Thin-QFN package that is just 0.75mm thin...