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ACT8740 数据表(PDF) 1 Page - Active-Semi, Inc |
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ACT8740 数据表(HTML) 1 Page - Active-Semi, Inc |
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1 / 40 page  Innovative Products. Active Solutions. - 1 - www.active-semi.com Copyright © 2008 Active-Semi, Inc. ActivePMU TM is a trademark of Active-Semi. I 2CTM is a trademark of Philips Electronics. ACT8740 Six Channel Integrated Power Management IC for Handheld Portable Equipment SYSTEM BLOCK DIAGRAM Pb-free 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 • 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 • Wireless Handhelds • DMB Enabled Devices • GPS Receivers, etc. GENERAL DESCRIPTION The patent-pending ACT8740 is a complete, cost effective, highly-efficient ActivePMUTM power man- agement 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 protec- tion (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 bat- tery charger incorporates an internal power MOS- FET for constant-current/constant-voltage, thermally regulated charging of a single-cell Li+ battery. All DC/DC converters and LDOs output voltages are programmable and controllable via the I2C interface. The ACT8740 is available in a tiny 4mm x 4mm 24-pin Thin-QFN package that is just 0.75mm thin. Rev PrB, 25-Feb-08 Advanced Product Information―All Information Subject to Change SCL SDA OUT3 1.4 to 3.7V Up to 350mA ON1 VIN System Control nMSTR CHGLEV Battery Programmable Up to 1A OUT4 1.4 to 3.7V Up to 250mA OUT5 1.4 to 3.7V Up to 250mA REG2 Step-Up DC/DC REG1 Step-Down DC/DC nIRQ OUT2 WLED Bias OUT1 1.1V to 4.4V Up to 350mA Single-Cell Li+ Battery Charger ACT8740 REG3 LDO REG4 LDO REG5 LDO TM PMU PMU Active |
类似零件编号 - ACT8740 |
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类似说明 - ACT8740 |
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