Dual PWM Step-Down DC/DCs in TDFN33
• Multiple Patents Pending
• Two Integrated Step-Down DC/DC Converters
− REG1: 350mA
− REG2: 550mA
• 180° Out-of-Phase Operation
− Reduces Input Capacitor Requirements
• Fixed or Adjustable Output Voltage Options
• Independent Enable/Disable Control
• Minimal External Components
• 3x3mm, Thin-DFN (TDFN33-10) Package
− Only 0.75mm Height
• Portable Devices and PDAs
• MP3/MP4 Players
• Wireless Handhelds
• GPS Receivers
The patent-pending ACT8325 integrates two step-
down DC/DCs into a single, thin, space-saving
package to provide a cost-effective, highly-efficient
ActivePMUTM power management solution. This
device is ideal for a wide range of portable hand-
held equipment that can benefit from the advan-
tages of ActivePMU technology but do not require a
high level of integration.
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 350mA and 550mA, respectively. Both
outputs are available in a wide range of factory-
preset output voltage options, and an adjustable
output voltage mode is also available.
The ACT8325 is available in a tiny 3mm x 3mm
10-pin Thin-DFN package that is just 0.75mm thin.
www.DaStaSYheSetT4UE.cMom BLOCK DIAGRAM
1.2V to 3.3V
Up to 350mA
1.2V to 3.3V
Up to 550mA
ActivePMUTM is a trademark of Active-Semi.
Copyright © 2008 Active-Semi, Inc.