ACT8309(2008) View Datasheet(PDF) - Active-Semi, Inc

Part Name

Description

Manufacturer

ACT8309
(Rev.:2008)

1.5A, PWM Step-Down DC/DCs in TDFN

Active-Semi, Inc 

Active-Semi

ACT8309/8310/8311

Rev PrA, 24-Jan-08

Advanced Product Information – All Information Subject to Change

1.5A, PWM Step-Down DC/DCs in TDFN

FEATURES

• 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

− RoHS-Compliant

• Independent Enable/Disable Control

• Minimal External Components

APPLICATIONS

• Wireless Handhelds

• Portable Devices

• GPS/PND equipment

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.

SYSTEM BLOCK DIAGRAM

2.7V to 5.0V

ON

OFF

Power-OK

Output

Active-Semi

IN

SW

ACT8311

EN

FB

POK

GP G

VOUT

Up to 1.5A

Pb-free

Innovative Products. Active Solutions.

-1-

www.active-semi.com

Copyright © 2008 Active-Semi, Inc.

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