ACT  -  系列元器件数据手册
ACT8710  -  Four Channel Integrated Power Management IC for Handheld Portable Equipment   -  Active Semi  -  电源管理

FEATURES
• Multiple Patents Pending
• Li+ Battery Charger with Integrated MOSFET
− Programmable Charge Current up to 1A
− ON/OFF Control and Status Indication
• Three Integrated Regulators
− 350mA Step-Down DC/DC
− 550mA Step-Down DC/DC
− Step-Up DC/DC with OVP for WLED Bias
• I2CTM Compatible Serial Interface
− Programmable Output Voltages
− Configurable Operating Modes
• Minimal External Components
• 4x4mm, Thin-QFN (TQFN44-24) Package
− Only 0.75mm Height
− RoHS Compliant
APPLICATIONS
• Portable Devices and PDAs
• Digital Media Players
• Battery Operated Devices
• GPS Receivers, etc.
GENERAL DESCRIPTION
The patent-pending ACT8710 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 350mA and 550mA, 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 ACT8710 is available in a tiny 4mm x 4mm 24-pin Thin-QFN package that is just 0.75mm thin.