ACT8740

Rev PrB, 25-Feb-08 Advanced Product Information―All Information Subject to Change ACT8740 Six 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 Five Integrated Regulators − 350mA PWM Step-Down DC/DC − Step-Up DC/DC with OVP for WLED Bias − 350mA Low Noise LDO − 250mA Low Noise LDO − 250mA Low Noise LDO GENERAL DESCRIPTION The patent-pending ACT8740 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 one PWM step-down DC/DC converter, one PWM step-up DC/DC converter with over-voltage protection (OVP), three low dropout linear regulators (LDOs) 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, LDOs and battery charger. REG1 is a fixed-frequency, current-mode PWM step -down DC/DC converter that is optimized for high efficiency and is capable of supplying up to 350mA output current. REG2 is a fixed-frequency, step-up DC/DC converter that safely and efficiently biases a string of up to seven white-LEDs for backlighting. REG3, REG4, and REG5 are low noise, high PSRR linear regulators that are capable of supplying up to 350mA, 250mA, and 250mA, respectively. The battery charger incorpora...