Active-Semi
FEATURES
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Multiple Patents Pending
Up to 95% High Efficiency
Up to 1.5A Guaranteed Output Current (ACT8311)
1.35MHz Constant Frequency Operation
Internal Synchronous Rectifier Eliminates
Schottky Diode
ACT8309: Up to 900mA
ACT8310: Up to 1.2A
ACT8311: Up to 1.5A
100% Duty Cycle Low-Dropout Operation
0.1µA Shutdown Current
Small TDFN33-8 Package
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RoHS-Compliant
ACT8309/8310/8311
Rev 0, 15-Jun-10
1.5A, PWM Step-Down DC/DCs in TDFN
GENERAL DESCRIPTION
The patent-pending ACT8309/ACT8310/ACT8311
are current-mode, fixed-frequency PWM, synchro-
nous step-down DC/DC converters that are capable
of delivering 1.5A with efficiency of up to 95%.
These devices operate with a fixed frequency of
1.35MHz, minimizing noise in sensitive equipment
as well as optimizing both efficiency and component
size and cost.
These devices feature very low-resistance power
MOSFET and 100% duty cycle operation, making
them ideal choices for portable applications requir-
ing a 3.0V or 3.3V rail to be generated from a Li+
battery.
The ACT8311 is capable of supplying up to 1.5A of
output current, while the ACT8309 and ACT8310
are capable of supplying up to 900mA and 1.2A,
respectively. All three devices have adjustable out-
put voltages that are programmable down to 1.2V.
Contact Active-Semi for custom fixed output voltage
availability.
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Enable/Disable Control
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Minimal External Components
APPLICATIONS
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Wireless Handhelds
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Portable Devices
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GPS/PND equipment
SYSTEM BLOCK DIAGRAM
2.7V to 5.0V
ON
OFF
Power-OK
Output
IN
EN
POK
Active-Semi
ACT8311
SW
V
OUT
Up to 1.5A
Pb-free
FB
GP
G
Innovative Power
TM
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www.active-semi.com
Copyright © 2010 Active-Semi, Inc.