ACT3780

Active-Semi FEATURES Product Brief, 29-May-08 Advanced Information―All Information Subject to Change ACT3780 ActivePathTM Battery Charger GENERAL DESCRIPTION The ACT3780 is a complete battery charging and management solution for one cell Lithium-Ion or Lithium-Polymer battery. The ACT3780 incorporates the ActivePath architecture which automatically selects the best available input supply for the system. When an external power source such as an AC adapter or a USB port is connected in, the ACT3780 regulates the system voltage to 4.8V in addition to providing charging current to the battery. If the external input source is not present or the system load current is more than the input source can provide, the ActivePath supplies additional current from the battery to the system. The ACT3780 charger is a complete, thermally regulated, stand-alone single cell linear Li+ charger that integrates an internal power 12V MOSFET. The battery regulation voltage is ±0.5% accurate, and is factory programmed from 4.2V (other voltages available upon request). The ACT3780 is available in an thermally enhanced 4mm x 4mm Thin-QFN and 3.5mm × 4.5mm ThinDFN 20-pin packages. • ActivePathTM System Power Selection of Best • • • • • • • • • • • • • • Available Input Supply 40mΩ Battery Switch for Highest Efficiency Dynamic Control of Charging Current Allowing System to Draw Maximum Load from AC/USB Input ±0.5% Battery Voltage Accuracy Up to 12V Input Thermal Regulation for Charge Control Charge Status Outputs for LED or System Interface Battery Voltage Level Indication Programmable Fast Charge Current Programmable Charging Timer Low Reverse Leakage Current Short-Circuit and Thermal Protection Preconditioning for Deeply Depleted Battery Low Quiescent Current Standby Mode Space-Saving, Thermally-Enhanced TQFN44-20 or TDFN3545-20 Packages APPLICATIONS • • • • • Personal Navigation Devices Smart Mobile Phones Blue-Tooth Devices Portable Media Players Portable Devices SIMPLIFIED APPLICATION CIRCUIT AC Adapter/USB CHG_IN SYS Li-ion Battery + ISET BAT STAT1 STAT2 To SYSTEM Pb Pb-free ACT3780 Active Path TM Innovative PowerTM ActivePathTM is a trademark of Active-Semi. -1- www.active-semi.com Copyright © 2008 Active-Semi, Inc. Active-Semi ORDERING INFORMATION PART NUMBER ACT3780QY-T ACT3780NY-T Product Brief, 29-May-08 ACT3780 TEMPERATURE RANGE -40°C to 85°C -40°C to 85°C BATTERY VOLTAGE 4.2V 4.2V SYSTEM VOLTAGE 4.6V 4.6V PACKAGE TQFN44-20 TDFN3545-20 PINS 20 20 : Battery and system 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. : All Active-Semi components are RoHS Compliant and with Pb-free plating unless specified differently. The term Pb-free means semiconductor products that are in compliance with current RoHS (Restriction of Hazardous Substances) standards. FUNCTIONAL BLOCK DIAGRAM Body Control CHG_IN Active-Semi ACT3780 SYS DC + – Body Control CHGLEV BAT + EN CURRENT SENSE ACIN VOLTAGE SENSE REF BLV1 TH System and Charger Control BLV2 nACOK STAT3 DCCC STAT2 BTR THERMAL REGULATION ISET STAT1 GA 110°C Innovative PowerTM -2- www.active-semi.com Copyright © 2008 Active-Semi, Inc.