ACT8740

Rev PrB, 25-Feb-08 Advanced Product Information―All 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 • 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 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 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. • 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 VIN CHGLEV Single-Cell Li+ Battery Charger REG1 Step-Down DC/DC Battery Programmable Up to 1A OUT1 1.1V to 4.4V Up to 350mA nMSTR nIRQ SCL SDA ON1 REG2 System Control Step-Up DC/DC OUT2 WLED Bias OUT3 1.4 to 3.7V Up to 350mA OUT4 1.4 to 3.7V Up to 250mA OUT5 1.4 to 3.7V Up to 250mA REG3 LDO Pb-free 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 © 2008 Active-Semi, Inc. ACT8740 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 Rev PrB, 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. 17 Functional Description .................................................................................................. p. 18 WLED BIAS DC/DC CONVERTER ......................................................................... P. 20 Electrical Characteristics ............................................................................................. p. 20 Register Descriptions ................................................................................................... p. 21 Typical Performance Characteristics ........................................................................... p. 23 Functional Description .................................................................................................. p. 24 LOW-NOISE, LOW-DROPOUT, LINEAR REGULATORS....................................... P. 26 Electrical Characteristics ............................................................................................. p. 26 Register Descriptions ................................................................................................... p. 29 Typical Performance Characteristics............................................................................ p. 31 Functional Description .................................................................................................. p. 32 SINGLE-CELL Li+ BATTERY CHARGER (CHGR) ................................................. P. 33 Electrical Characteristics .............................................................................................. p. 33 Register Descriptions ................................................................................................... p. 34 Typical Performance Characteristics ............................................................................ p. 36 Functional Description .................................................................................................. p. 37 PACKAGE INFORMATION ...................................................................................... P. 40 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. ACT8740 FUNCTIONAL BLOCK DIAGRAM VSYS Rev PrB, 25-Feb-08 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 110°C VP1 To Battery SCL SDA Serial Interface REG1 SW1 OUT1 OUT1 GP1 VINUVLO VSYS nMSTR PUSH BUTTON REG2 OUT3 nIRQ System Control SW2 OVP2 FB2 GP2 To Battery OUT2 INL ON1 LDO REG3 REFBP OUT3 OUT3 To Battery Reference LDO REG4 OUT4 OUT4 GA LDO REG5 OUT5 OUT5 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. ACT8740 ORDERING INFORMATION PART NUMBER ACT8740QLEGA-T Rev PrB, 25-Feb-08 VOUT1 1.8V VOUT3 3.0V VOUT4 2.5V VOUT5 3.0V PACKAGE TQFN44-24 PINS 24 TEMPERATURE RANGE -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 OVP2 SW2 GP2 24 VIN SCL SDA nIRQ nMSTR OUT3 1 2 3 4 5 6 7 INL BAT FB2 22 21 20 19 18 REFBP 17 GA 16 VSYS ACT8740 EP 8 OUT5 9 OUT4 10 GP1 11 SW1 12 VP1 15 ON1 14 GA 13 OUT1 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. ACT8740 PIN DESCRIPTIONS PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14,17 15 16 Rev PrB, 25-Feb-08 NAME VIN SCL SDA nIRQ nMSTR OUT3 INL OUT5 OUT4 GP1 SW1 VP1 OUT1 GA ON1 VSYS DESCRIPTION Power Input for the Battery Charger. The Battery Charger, REG1 and REG3 are automatically enabled whenever a valid voltage is present on VIN. Bypass to GA with a high quality ceramic capacitor placed as close as possible to the IC. 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 or when a fault-condition occurs. If interrupts are not masked. Master Enable Input. Drive nMSTR to GA or to a logic low to enable the IC. Output voltage for REG3. Capable of delivering up to 350mA of output current. Output has high impedance when disabled. Power input for REG3, REG4 and REG5. Bypass to GA with a high quality ceramic capacitor placed as close as possible to the IC. Output voltage for REG5. Capable of delivering up to 250mA of output current. Output has high impedance when disabled. Output voltage for REG4. Capable of delivering up to 250mA of output current. Output has high impedance when disabled. Power Ground for REG1. Connect GA, GP1 and GP2 together at a single point as close to the IC as possible. Switching Node Output for REG1. Connect this pin to the switching end of the inductor. Power Input for REG1. Bypass to GP1 with a high quality ceramic capacitor placed as close as possible to the IC. Output Feedback Sense for REG1. Connect this pin directly to the output node to connect the internal feedback network to the output voltage. Analog Ground. Connect GA directly to a quiet ground node. Connect GA, GP1 and GP2 together at a single point as close to the IC as possible. Enable Control Input for REG1 and REG3. Drive ON1 to VSYS or to a logic high for normal operation, drive to GA or a logic low to disable REG1 and REG3. 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. ACT8740 PIN DESCRIPTIONS CONT’D PIN 18 19 20 21 22 23 Rev PrB, 25-Feb-08 NAME REFBP FB2 OVP2 GP2 SW2 DESCRIPTION Reference Noise Bypass. Connect a 0.01µF ceramic capacitor from REFBP to GA. This pin is discharged to GA in shutdown. Feedback Sense for REG2. Connect this pin to the LED string current sense resistor to sense the LED current. Over-Voltage Protection Input for REG2. Connect this pin directly to the output node to sense and prevent over-voltage conditions. Power Ground for REG2. Connect GP2 directly to a power ground plane. Connect GA, GP1 and GP2 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. Tri-State Charging State Select Input. When ISET1[ ] = [0000], drive CHGLEV to VSYS or to a CHGLEV logic high for high-current charging mode (450mA), and drive to GA or a logic low for lowcurrent charging mode (90mA). Allow CHGLEV to float (|ICHGLEV| < 2µA) to disable the charger. BAT EP Output Voltage for the Battery Charger. Connect this pin directly to the battery anode (+ terminal) to sense the battery voltage. Exposed Pad. Must be soldered to ground on PCB. 24 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. ACT8740 ABSOLUTE MAXIMUM RATINGS PARAMETER VP1, SW1 to GP1, VSYS, SCL, SDA, INL, OUT1, OUT2, OUT3, OUT4, OUT5, FB2, BAT, CHGLEV, ON1, nMSTR, nIRQ to GA SW1 to VP1 OVP2, SW2 to GP2 VIN to GA t