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| Product Brief, 19-Feb-08 Advanced InformationAll Information Subject to Change ACT8770 Six Channel Integrated Power Management IC for Handheld Portable Equipment FEATURES * Multiple Patents Pending * Li+ Battery Charger with Integrated MOSFET - Auto-Select Charge Current (AC or USB) - ON/OFF Control and Status Indication GENERAL DESCRIPTION The patent-pending ACT8770 is a complete, costeffective, highly efficient ActivePMUTM integrated power management solution that is ideal for a wide range of portable handheld equipment. This device integrates two PWM step-down DC/DC converters, three low dropout linear regulators (LDOs) and a full-featured linear-mode Li+ battery charger into a single, thin, space-saving package. 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 to 350mA and 550mA, respectively. The three LDOs are high PSRR linear regulators, each capable of supplying up to 250mA. The battery charger incorporates an internal power MOSFET for constant-current/constant-voltage, thermally regulated charging of a single-cell Li+ battery. The ACT8770 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 - 550mA PWM Step-Down DC/DC - 250mA High PSRR LDO - 250mA High PSRR LDO - 250mA High PSRR LDO * 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. SYSTEM BLOCK DIAGRAM Battery Selectable up to 1A VIN ACIN CHGLEV nSTAT Single Cell Li+ Battery Charger REG1 Step-Down DC/DC OUT1 0.645V to 3.3V Up to 350mA OUT2 0.645V to 3.3V Up to 550mA OUT3 1.4V to 3.7V Up to 250mA OUT4 1.4V to 3.7V Up to 250mA OUT5 1.4V to 3.7V Up to 250mA REG2 nMSTR nIRQ ON1 ON3 ON5 System Control Step-Down DC/DC REG3 LDO REG4 LDO ACT8770 Active PMU TM REG5 LDO Innovative Products. Active Solutions. ActivePMU TM -1- www.active-semi.com Copyright (c) 2008 Active-Semi, Inc. is a trademark of Active-Semi. Product Brief, 19-Feb-08 ACT8770 PRODUCT OPTIONS Block CHGR REG1 REG2 REG3 REG4 REG5 Function Battery Charger Step-Down DC/DC Step-Down DC/DC LDO LDO LDO Output Voltage 4.20V (4.10V to 4.30V available) 0.645V to 3.3V Capability Selectable up to 1A 350mA 550mA 250mA 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 BODY AND VSYS CONTROL ACT8770 BAT Li+ Battery + AC Adaptor 4.3V to 6V VIN USB VINUVLO CURRENT SENSE VOLTAGE SENSE PRECONDITION nSTAT 4.0V CHARGE STATUS 2.9V Charge Control THERMAL REGULATION ACIN OUT2 CHGLEV FLOAT 110C VP1 To Battery REG1 SW1 OUT1 OUT1 GP12 VP2 VINUVLO VSYS nMSTR PUSH BUTTON OUT2 nIRQ System Control REG2 To Battery SW2 OUT2 OUT2 GP12 INL To Battery ON1 LDO REG3 ON3 LDO REG4 OUT3 OUT3 OUT4 OUT4 ON5 GA LDO REG5 OUT5 OUT5 Innovative Products. Active Solutions. -2- www.active-semi.com Copyright (c) 2008 Active-Semi, Inc. |
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