ACT3780 データシートの表示（PDF） - Active-Semi, Inc

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ACT3780

ActivePath™ Battery Charger

Active-Semi, Inc 

ACT3780

Rev 8, 09-Jul-13

ActivePathTM Battery Charger

FEATURES

• ActivePathTM System Power Selection of Best

Available Input Supply

• 50mΩ Battery Switch for Highest Efficiency

• Dynamic Control of Charging Current Allowing

System to Draw Maximum Load from AC/USB

Input

• ±0.5% Battery Charge Voltage Accuracy

• Up to 12V Input with Over Voltage Protection

• Thermal Regulation for Charge Control

• Charge Status Outputs for LED or System

Interface

• Battery Voltage Level Indication

• Programmable Fast Charge Current

• Programmable Charging Timer

• Low Reverse Leakage Current

• Short-Circuit and Thermal Protection

• Preconditioning for Deeply Depleted Battery

• Low Quiescent Current Standby Mode

• Space-Saving, Thermally-Enhanced

TQFN44-20 Packages

APPLICATIONS

• Personal Navigation Devices

• Smart Mobile Phones

• Blue-Tooth Devices

• Portable Media Players

• Portable Devices

GENERAL DESCRIPTION

The ACT3780 is a complete battery-charging and

system power management solution for portable

hand-held equipment using single-cell Lithium-

based batteries. The ACT3780 incorporates Active-

Semi's proprietary ActivePath architecture which

automatically selects the best available input supply

for the system.

The ActivePath architecture performs three

important functions: First, the battery is charged

while powering with the system, minimizing current

draw from the battery while ensuring that sufficient

current is available to power the system. Second, if

no input supply is available, system power is

automatically switched to the battery. And finally, if

the system load-requirement exceeds the capability

of the input supply, ActivePath automatically

supplements the input with the battery to satisfy the

system's power requirements.

In addition to ActivePath, the ACT3780 charger

features a complete, high-accuracy (±0.5%),

thermally regulated, stand-alone single cell linear

Li+ charger with an integrated 12V power

MOSFET. The ACT3780 is available in a thermally

enhanced 4mm × 4mm Thin-QFN44-20.

ActivePath DIAGRAM

Innovative PowerTM

-1-

Active-Semi Proprietary―For Authorized Recipients and Customers

ActivePathTM is a trademark of Active-Semi.

www.active-semi.com

Copyright © 2013 Active-Semi, Inc.

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