View ACT8712_4142794.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Product Brief, 03-Feb-08 Advanced InformationAll 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
- 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 hand held 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 and charger current 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 - Programmable Charger Current
* Minimal External Components * 4x4mm, Thin-QFN (TQFN44-24) Package
- Only 0.75mm Height - RoHS Compliant
APPLICATIONS
* Portable Devices and PDAs * UMPC * 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 550mA OUT2 1.1V to 4.4V Up to 750mA
REG2
Step-Down DC/DC
REG3
ACT8712
PMU Active
Step-Up DC/DC
OUT3 WLED Bias
TM
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
ACT8712
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 550mA 750mA 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
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
VIN CHGLEV FLOAT
Charge Control
2.9V
THERMAL REGULATION
110C 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.
-2-
www.active-semi.com Copyright (c) 2008 Active-Semi, Inc.

▲Up To Search▲

Price & Availability of ACT8712

	To Download ACT8712 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .