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Copyright © 2015 Active-Semi, Inc.

FEATURES

Type-C Support

Devices

Protection for 5.1V/9.1V/12.1V Outputs

APPLICATIONS

GENERAL DESCRIPTION

ACT4529 is a wide input voltage, high efficiency

step-down DC/DC converter that operates in either

CV (Constant Output Voltage) mode or CC

(Constant Output Current) mode. This device has

QC2.0 built in to provide 5.1V/9.1V/12.1V outputs

as requested by attached portable devices. Besides

building in QC2.0 decoding, it also supports Apple,

Samsung and BC1.2 devices to charge at full

current rate. ACT4529 has an interface for USB-PD

control via a tri-state digital pin. Vout is 5.1V if this

pin is floating, Vout is 9.1V when this pin voltage is

less than 0.8V and Vout is 12.1V while this pin

voltage is more than 2.0V.

ACT4529 has accurate output current limits under

constant

current

regulation

to

meet

MFi

specification. It provides up to 3.0A output current

at 125kHz switching frequency. ACT4529 utilizes

adaptive drive technique to achieve good EMI

performance while main >90% efficiency at full load

for mini size CLA designs. It also has output short

circuit protection with hiccup mode. The average

output current is reduced to below 6mA when

output is shorted to ground. Other features include

output

over

voltage

protection

and

thermal

shutdown.

This device is available in a SOP-8EP package and

require very few external components for operation.

ACT4529

40V/3.0A CV/CC Buck Converter Featuring QC2.0 ,USB Auto-Detect and USB-PD

Typical Application Circuit

V/I Profile

ACT4529

HSB

IN

SW

6.0V to 40V

DM

Rcs

25mΩ

CSP

DP

Vout

GND

D-

D+

GND

CSN

5V/9V/12V

C2

10μF

C3

22nF

C5

220μF

C1

47μF

C4

22μF

C6

2.2μF

D1

SK54

L1

47μH

PDC

USB-PD Controller

I/O

CC1

CC2

CC1

CC2

2.65A

5.1V

Vout

Iout

3.2V

9.1V

12.1V

* Patent Pending