ACT8712

Rev0, 25-Feb-08 Advanced Product Information―All Information Subject to Change ACT8712 Four 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 and Status Indication GENERAL DESCRIPTION The patent-pending ACT8712 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 550mA and 750mA, 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 ACT8712 is available in a tiny 4mm x 4mm 24-pin Thin-QFN package that is just 0.75mm thin. • Three Integrated Regulators − 550mA Step-Down DC/DC − 750mA 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. SYSTEM BLOCK DIAGRAM VIN CHGLEV nSTAT nMSTR nIRQ nRSTO SCL SDA ON1 ON2 Single-Cell Li+ Battery Charger Battery Programmable Up to 1A REG1 Step-Down DC/DC System Control OUT1 1.1V to 4.4V Up to 550mA OUT2 1.1V to 4.4V Up to 750mA REG2 Step-Down DC/DC Pb-free ACT8712 Active REG3 Step-Up DC/DC PMU TM OUT3 WLED Bias Innovative Products. Active Solutions. ActivePMUTM is a trademark of Active-Semi. I2CTM is a trademark of Philips Electronics. -1- www.active-semi.com Copyright © 2008 Active-Semi, Inc. ACT8712 TABLE OF CONTENTS GENERAL INFORMATION ...................................................................................... P. 01 Functional Block Diagram .................................................................................................. p. 03 Ordering Information .......................................................................................................... p. 04 Pin Configuration ............................................................................................................... p. 04 Pin Descriptions ................................................................................................................. p. 05 Absolute Maximum Ratings ............................................................................................... p. 07 Rev0, 25-Feb-08 SYSTEM MANAGEMENT ....................................................................................... P. 08 Register Descriptions ......................................................................................................... p. 08 Electrical Characteristics .................................................................................................... p. 09 I2C Interface Electrical Characteristics ............................................................................... p. 10 Typical Performance Characteristics ................................................................................. p. 11 Functional Description ....................................................................................................... p. 12 STEP-DOWN DC/DC CONVERTERS ...................................................................... P. 14 Electrical Characteristics ................................................................................................... p. 14 Register Descriptions ......................................................................................................... p. 15 Typical Performance Characteristics ................................................................................. p. 20 Functional Description ....................................................................................................... p. 21 WLED BIAS DC/DC CONVERTER ......................................................................... P. 23 Electrical Characteristics .................................................................................................... p. 23 Register Descriptions ......................................................................................................... p. 24 Typical Performance Characteristics ................................................................................. p. 26 Functional Description ....................................................................................................... p. 27 SINGLE-CELL Li+ BATTERY CHARGER ............................................................... P. 29 Electrical Characteristics .................................................................................................... p. 29 Register Descriptions ......................................................................................................... p. 30 Typical Performance Characteristics ................................................................................. p. 32 Functional Description ....................................................................................................... p. 33 PACKAGE INFORMATION ...................................................................................... P. 36 Innovative Products. Active Solutions. ActivePMUTM is a trademark of Active-Semi. I2CTM is a trademark of Philips Electronics. -2- www.active-semi.com Copyright © 2008 Active-Semi, Inc. ACT8712 FUNCTIONAL BLOCK DIAGRAM VSYS Rev0, 25-Feb-08 BODY AND VSYS CONTROL ACT8712 BAT Li+ Battery + CURRENT SENSE VOLTAGE SENSE PRECONDITION AC Adaptor or USB 4.3V to 6V VIN VINUVLO nSTAT 4.0V CHARGE STATUS OUT2 CHGLEV FLOAT Charge Control 2.9V THERMAL REGULATION 110°C VP1 SCL SDA OUT2 nRSTO Serial Interface REG1 To Battery SW1 OUT1 OUT1 GP12 VP2 VSYS nMSTR PUSH BUTTON OUT2 nIRQ System Control SW3 ON1 REG3 ON2 GA OVP3 FB3 GP3 To Battery OUT3 REG2 SW2 OUT2 OUT2 GP12 To Battery Innovative Products. Active Solutions. ActivePMUTM is a trademark of Active-Semi. I2CTM is a trademark of Philips Electronics. -3- www.active-semi.com Copyright © 2008 Active-Semi, Inc. ACT8712 ORDERING INFORMATION PART NUMBER ACT8712QLCHA-T ACT8712QLEHA-T Rev0, 25-Feb-08 VOUT1 1.2V 1.8V VOUT2 3.3V 3.3V PACKAGE TQFN44-24 TQFN44-24 PINS 24 24 TEMPERATURE RANGE -40°C to +85°C -40°C to +85°C OUTPUT VOLTAGE CODES C 1.2V D 1.5V E 1.8V F 2.5V G 3.0V H 3.3V : Output voltage options detailed in this table represent standard voltage options, and are available for samples or production orders. Additional output voltage options, as detailed in the Output Voltage Codes table, are available for production subject to minimum order quantities. 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. PIN CONFIGURATION TOP VIEW CHGLEV 23 nSTAT OVP3 SW3 GP3 24 VIN SCL SDA nIRQ nMSTR nRSTO 1 2 3 4 5 6 7 OUT1 BAT 22 21 20 19 18 FB3 17 GA 16 VSYS ACT8712 EP 8 VP1 9 SW1 10 GP12 11 SW2 12 VP2 15 ON1 14 ON2 13 OUT2 Thin - QFN (TQFN44-24) Innovative Products. Active Solutions. ActivePMUTM is a trademark of Active-Semi. I2CTM is a trademark of Philips Electronics. -4- www.active-semi.com Copyright © 2008 Active-Semi, Inc. ACT8712 PIN DESCRIPTIONS PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Rev0, 25-Feb-08 NAME VIN SCL SDA nIRQ nMSTR nRSTO OUT1 VP1 SW1 GP12 SW2 VP2 OUT2 ON2 ON1 VSYS DESCRIPTION Power Input for the Battery Charger. Bypass VIN to GA with a capacitor placed as close to the IC as possible. The battery charger and both step-down DC/DCs (REG1 and REG2) are automatically enabled when a valid voltage is present on VIN. Clock Input for I2C Serial Interface. Data is read on the rising edge of the clock. Data Input for I2C Serial Interface. Data is read on the rising edge of the clock. Open-Drain Push-Button Status Output. nIRQ is an open-drain output which sinks current when nMSTR is asserted. Master Enable Input. Drive nMSTR to GA or to a logic low to enable IC. Open-Drain Reset Output. nRSTO asserts low for the reset timeout period of 300ms whenever the IC is enabled. Output Feedback Sense for REG1. Connect this pin directly to the output node to connect the internal feedback network to the output voltage. Power Input for REG1. Bypass to GP12 with a high quality ceramic capacitor placed as close as possible to the IC. Switching Node Output for REG1. Connect this pin to the switching end of the inductor. Power Ground for REG1 and REG2. Connect GA, GP12, and GP3 together at a single point as close to the IC as possible. Switching Node Output for REG2. Connect this pin to the switching end of the inductor. Power Input for REG2. Bypass to GP12 with a high quality ceramic capacitor placed as close as possible to the IC. Output Feedback Sense for REG2. Connect this pin directly to the output node to connect the internal feedback network to the output voltage. Enable Control Input for REG3. ON2 is functional only when ON1 is driven high, nMSTR is driven low, or when a valid supply voltage is present on VIN. Drive ON2 to VSYS or to a logic high for normal operation, drive to GA or a logic low to disable REG3. Enable Control Input for REG1 and REG2. Drive ON1 to VSYS or to a logic high for normal operation, drive to GA or to a logic low to disable REG1 and REG2. Power Bypass for System Management Circuitry. Bypass to GA with a high quality ceramic capacitor placed as close as possible to the IC. VSYS is internally connected to the higher voltage of either VVIN or VBAT. Do not load VSYS with more than 100µA. Innovative Products. Active Solutions. ActivePMUTM is a trademark of Active-Semi. I2CTM is a trademark of Philips Electronics. -5- www.active-semi.com Copyright © 2008 Active-Semi, Inc. ACT8712 PIN DESCRIPTIONS CONT’D PIN 17 18 19 20 21 Rev0, 25-Feb-08 NAME GA FB3 OVP3 GP3 SW3 DESCRIPTION Analog Ground. Connect GA directly to a quiet ground node. Connect GA, GP12, and GP3 together at a single point as close to the IC as possible. Feedback Sense for REG3. Connect this pin to the LED string current sense resistor to sense the LED current. Over-Voltage Protection Input for REG3. Connect this pin directly to the output node to sense and prevent over-voltage conditions. Power Ground for REG3. Connect GP3 directly to a power ground plane. Connect GA, GP12, and GP3 together at a single point as close to the IC as possible. Switching Node Output for REG3. Connect this pin to the switching end of the inductor. Active-Low Open-Drain Charger Status Output. nSTAT sinks current whenever the charger is charging the battery, and is high-Z otherwise. nSTAT has a 6mA (typ) current limit, allowing it to directly drive an indicator LED without additional external components. To generate a logic-level output, connect nSTAT to an appropriate supply voltage (typically OUT2) through a 10kΩ or greater pull-up resistor. Tri-State Charging State Select Input. When ISET1[ ] = [0000], drive CHGLEV to VSYS or to a logic high for high-current charging mode (maximum charge current of 500mA), and drive to GA or a logic low for low-current charging mode (maximum charge current of 100mA). Allow CHGLEV to float (|ICHGLEV| < 2µA) to disable the charger. Battery Charger Output. Connect this pin directly to the battery anode (+ terminal) to sense the battery voltage. Exposed Pad. Must be soldered to ground on PCB. 22 nSTAT 23 CHGLEV 24 EP BAT EP Innovative Products. Active Solutions. ActivePMUTM is a trademark of Active-Semi. I2CTM is a trademark of Philips Electronics. -6- www.active-semi.com Copyright © 2008 Active-Semi, Inc. ACT8712 ABSOLUTE MAXIMUM RATINGS PARAMETER VP1, SW1, VP2, SW2 to GP12, VSYS, OUT1, OUT2, FB3, BAT, CHGLEV, nSTAT, ON1, ON2, nRSTO, nMSTR, nIRQ, SCL, SDA to GA OVP3, SW3 to GP3 SW1 to VP1, SW2 to VP2 VIN to GA t