ACT4523AYH-T datasheet(1/15 Pages) ACTIVE-SEMI

Part #	ACT4523AYH-T

Description	Wide-Input Sensorless CC/CV Step-Down DC/DC Converter

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Manufacturer	ACTIVE-SEMI [Active-Semi, Inc]

Direct Link	http://www.active-semi.com

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Innovative Power

TM

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www.active-semi.com

FEATURES

• 40V Input Voltage Surge

• 36V Steady State Operation

• Up to 3.5A Output Current

• Output Voltage up to 12V

• 250kHz Switching Frequency

• 91% Efficiency (Vout = 5V@3.5A at Vin = 12V)

• Patented ActiveCC Sensorless Constant Current

Control

− Integrated Current Control Improves

Efficiency, Lowers Cost, and Reduces

Component Count

• Resistor Programmable

− Current Limit from 1.5A to 4.0A

− Patented Cable Compensation from 0 to

0.25Ω

• ±6.5% CC Accuracy

− Compensation of Input /Output Voltage Change

− Temperature Compensation

− Independent of inductance and Inductor DCR

• 2% Feedback Voltage Accuracy

• Advanced Feature Set

− Integrated Soft Start

− Thermal Shutdown

− Secondary Cycle-by-Cycle Current Limit

− Protection Against Shorted ISET Pin

• SOP-8EP Package

APPLICATIONS

• Car Charger/ Adaptor

• Rechargeable Portable Devices

• General-Purpose CC/CV Supply

GENERAL DESCRIPTION

ACT4523A is a wide input voltage, high efficiency

ActiveCC step-down DC/DC converter that operates

in either CV (Constant Output Voltage) mode or CC

(Constant Output Current) mode. ACT4523A

provides up to 3.5A output current at 250kHz

switching frequency.

Active CC is a patented control scheme to achieve

highest accuracy with sensorless constant current

control. ActiveCC eliminates the expensive, high

accuracy current sense resistor, making it ideal for

battery charging applications and adaptors with

accurate current limit. The ACT4523A achieves

higher efficiency than traditional constant current

switching regulators by eliminating its associated

power loss on the sensing resistor. ACT4523A

provides OVP pin for output over voltage protection.

Protection features include cycle-by-cycle current

limit, thermal shutdown, and frequency foldback at

short circuit. The devices are available in a SOP-

8EP package and require very few external devices

for operation.

ACT4523A

Wide-Input Sensorless CC/CV Step-Down DC/DC Converter

Output Current (A)

1.4

1.6

1.8

2.0

2.2

2.4

2.6

2.8

3.0

6.0

5.0

4.0

3.0

2.0

1.0

0.0

CC/CV Curve

Rev 0, 25-Jul-13

VIN = 12V

VIN = 24V

VIN = 18V

Similar Part No. - ACT4523AYH-T

Manufacturer	Part #	Datasheet	Description
Active-Semi, Inc	ACT4523AYH-T	400Kb / 15P	Wide-Input Sensorless CC/CV Step-Down DC/DC Converter Rev 0, 25-Jul-13

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ACT4523AYH-T Datasheet(PDF) 1 Page - Active-Semi, Inc

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