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| Product Brief, 03-Feb-08 Advanced InformationAll 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 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 incorporates an internal power MOSFET for constantcurrent/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. * 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. SYSTEM BLOCK DIAGRAM REG1 Step-Down DC/DC Battery Programmable Up to 1A OUT1 1.1V to 4.4V Up to 350mA OUT2 WLED Bias OUT3 1.4V to 3.7V Up to 350mA OUT4 1.4V to 3.7V Up to 250mA OUT5 1.4V to 3.7V Up to 250mA VIN CHGLEV Single Cell Li+ Battery Charger REG2 nMSTR nIRQ SCL SDA ON1 System Control Step-Up DC/DC REG3 LDO REG4 LDO ACT8740 Active PMU TM REG5 LDO Innovative Products. Active Solutions. ActivePMUTM is a trademark of Active-Semi. I2CTM is a trademark of Philips Electronics. -1- www.active-semi.com Copyright (c) 2008 Active-Semi, Inc. Product Brief, 03-Feb-08 ACT8740 PRODUCT OPTIONS Block CHGR REG1 REG2 REG3 REG4 REG5 Function Battery Charger Step-Down DC/DC Step-Up DC/DC LDO LDO LDO Output Voltage 4.20V (4.10V to 4.40V available) 1.1V to 4.4V Up to 27.5V Capability Programmable up to 1A 350mA Up to 7 WLEDs 350mA 1.4V to 3.7V 250mA 250mA : Output voltage options detailed in this table represent standard voltage options, and are available for samples or production orders. Contact Active-Semi for more information regarding semi-custom output voltage combinations. : Contact factory for additional available products or custom requirements. FUNCTIONAL BLOCK DIAGRAM VSYS Active-Semi BODY AND VSYS CONTROL ACT8740 BAT Li+ Battery + CURRENT SENSE VOLTAGE SENSE AC Adaptor or USB 4.3V to 6V VIN VINUVLO 4.0V Charge Control CHGLEV FLOAT OUT3 PRECONDITION 2.9V THERMAL REGULATION 110C VP1 To Battery SCL REG1 Serial Interface SW1 OUT1 OUT1 GP1 VINUVLO SDA VSYS nMSTR SW2 PUSH BUTTON OUT3 nIRQ System Control REG2 OVP2 FB2 GP2 To Battery OUT2 INL To Battery ON1 LDO REG3 REFBP Reference LDO REG4 OUT3 OUT3 OUT4 OUT4 GA LDO REG5 OUT5 OUT5 Innovative Products. Active Solutions. -2- www.active-semi.com Copyright (c) 2008 Active-Semi, Inc. |
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