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Product Brief, 03-Feb-08 Advanced InformationAll Information Subject to Change
ACT8710
Four Channel Integrated Power Management IC for Handheld Portable Equipment FEATURES
* Multiple Patents Pending * Li+ Battery Charger with Integrated MOSFET
- ON/OFF Control and Status Indication
GENERAL DESCRIPTION
The patent-pending ACT8710 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 350mA and 550mA, 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 ACT8710 is available in a tiny 4mm x 4mm 24-pin Thin-QFN package that is just 0.75mm thin.
* Three Integrated Regulators
- 350mA Step-Down DC/DC - 550mA 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
Single Cell Li+ Battery Charger
Battery Programmable Up to 1A
REG1
nMSTR nIRQ nRSTO SCL SDA ON1 ON2 System Control Step-Down DC/DC
OUT1 1.1V to 4.4V Up to 350mA OUT2 1.1V to 4.4V Up to 550mA
REG2
Step-Down DC/DC
REG3
ACT8710
Active PMU
TM
Step-Up DC/DC
OUT3 WLED Bias
Innovative Products. Active Solutions.
ActivePMU is a trademark of Active-Semi. I2CTM is a trademark of Philips Electronics.
TM
-1-
www.active-semi.com Copyright (c) 2008 Active-Semi, Inc.
Product Brief, 03-Feb-08
ACT8710
PRODUCT OPTIONS
Block
CHGR REG1 REG2 REG3
Function
Battery Charger Step-Down DC/DC Step-Down DC/DC Step-Up DC/DC
Output Voltage
4.20V (4.10V to 4.40V available) Programmable 1.1V to 4.4V Programmable up to 27.5V
Capability
Programmable up to 1A 350mA 550mA Up to 7 WLEDs
: 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
ACT8710
BAT Li+ Battery +
CURRENT SENSE VOLTAGE SENSE
AC Adaptor 4.3V to 6V or USB
VIN
VINUVLO
VIN CHGLEV FLOAT
4.0V Charge Control
PRECONDITION
2.9V
THERMAL REGULATION
110C VP1 To Battery
SCL SDA OUT2 nRSTO REG1 SW1 OUT1 OUT1 GP12 Serial Interface
VSYS nMSTR PUSH BUTTON OUT2 nIRQ System Control
VP2 To Battery
REG2
SW2 OUT2 OUT2 GP12
SW3 ON1 REG3 ON2 GA OVP3 FB3 GP3
To Battery OUT3
Innovative Products. Active Solutions.
-2-
www.active-semi.com Copyright (c) 2008 Active-Semi, Inc.

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