Innovative Products. Active Solutions. - 1 - www.active-semi.com
Copyright © 2007 Active-Semi, Inc.
ActivePMUTM is a trademark of Active-Semi.
ACT8704
Product Brief, 09-Nov-07
Advanced Information - All Information Subject to Change
Four Channel Integrated Power Management IC
for Handheld Portable Equipment
SYSTEM BLOCK DIAGRAM
FEATURES
• Multiple Patents Pending
• Li+ Battery Charger with Integrated MOSFET
− ON/OFF Control and Status Indication
• Three Integrated Regulators
− 550mA PWM Step-Down DC/DC
− 750mA PWM Step-Down DC/DC
− Step-Up DC/DC with OVP for WLED Bias
• 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.
GENERAL DESCRIPTION
The patent-pending ACT8704 is a complete, cost-
effective, highly-efficient ActivePMUTM power man-
agement solution that is ideal for a wide range of
portable handheld equipment. This device inte-
grates two step-down DC/DC converters for proces-
sor core and I/O power, one step-up DC/DC con-
verter with over-voltage protection (OVP) and a full-
featured, linear-mode Li+ battery charger into a sin-
gle, thin, space-saving package.
REG1 and REG2 are fixed-frequency, current-mode
PWM step-down DC/DC converters that are opti-
mized for high efficiency and are capable of supply-
ing up to 550mA and 750mA, respectively. REG3 is
a fixed-frequency, step-up DC/DC 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 con-
stant-current/constant-voltage, thermally regulated
charging of a single-cell Li+ battery.
The ACT8704 is available in a tiny 4mm x 4mm 24-
pin Thin-QFN package that is just 0.75mm thin.
nRSTO OUT2
1.2V to 3.3V
Up to 750mA
ON1
VIN
nMSTR
CHGLEV Battery
100mA/500mA
OUT3
WLED Bias
nIRQ
OUT1
1.2V to 3.3V
Up to 550mA
ON2
nSTAT
ACT8704 REG3
Step-Up
DC/DC
Single Cell
Li+ Battery
Charger
System
Control REG2
Step-Down
DC/DC
REG1
Step-Down
DC/DC
Product Brief, 09-Nov-07
ACT8704
Innovative Products. Active Solutions. - 2 - www.active-semi.com
Copyright © 2007 Active-Semi, Inc.
PRODUCT OPTIONS
: 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
REG1
Charge
Control
REG2
VP1
VP2
GP12
GP12
REG3
SW2
SW1
ON1
nRSTO
nMSTR
PUSH
BUTTON
nIRQ
ON2
VSYS
VIN BAT
CHGLEV
2.9V
PRE-
CONDITION
CURRENT
SENSE
VOLTAGE
SENSE
OUT2
OUT1
110°C
THERMAL
REGULATION
OUT2
FLOAT
OUT2
OUT2
4.0V
VINUVLO
nSTAT
CHARGE STATUS
4.3V to 6V
OUT2
OUT1
VSYS
BODY AND
VSYS
CONTROL
System
Control
GP3
SW3 To Battery
OUT3
FB3
OVP3
ACT8704
AC Adaptor
or USB
To Battery
GA
+
Li+ Battery
To Battery
Block Function Output Voltage Capability
CHGR Battery Charger 4.20V (4.10V to 4.30V available) 100mA/500mA
REG1 Step-Down DC/DC 1.2V, 1.5V, 1.8V, 2.5V, 3.0V, or 3.3V 550mA
REG2 Step-Down DC/DC 750mA
REG3 Step-Up DC/DC Up to 27.5V Up to 7 WLEDs
