ACT4524
40V/3.5A Buck Converter with Dual Output
and Separated Over Current Protection
FEATURES
• 40V Input Voltage Surge
• 4.5V-36V operational Input Voltage
• Dual 5.1V Outputs with 1% Accuracy
• Up to 3.5A Output Current
• 2.65A Constant Current Regulation for VOUT1
• 1.2A Constant Current Regulation for VOUT2
• Hiccup Mode Protection at Output Short
• >90% Efficiency at Full Load
• <0.5mA Low Standby Input Current
• 5.7V Output Over Voltage Protection
• Cord Voltage Drop Compensation
• Meet EN55022 Class B Radiated EMI Standard
• SOP-8EP Package
APPLICATIONS
• Car Charger
• Cigarette Lighter Adaptor (CLA)
• Rechargeable Portable Devices
• CC/CV regulation DC/DC converter
GENERAL DESCRIPTION
ACT4524 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. ACT4524 has separated output
current limits for dual ports CLA application. With the
separated current limits, the CLA can meet Apple’s
MFI standard.
ACT4524 provides up to 3.5A output current at 125kHz
switching frequency. ACT4524 utilizes adaptive drive
technique to achieve good EMI performance while
maintain 90% efficiency at full load for mini size
CLA designs.
ACT4524 also has built in hiccup mode output short
circuit protection. 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.
ACT4524 is available in a SOP-8EP package and
require very few external components for operation.
TYPICAL APPLICATION CIRCUIT
6.0V to 36V
C1
C2 C3
47µF 0.1µF 10µF
R1 0Ω
CSN2 CSN1 HSB
IN
SW
ACT4524
CSP
GND CLK MODE
R2
5.1Ω
C5
2.2nF
C4
22nF
L1 33µH
D1
S54
C6
10µF
Rcs1
25m
Rcs2
50m
C7
220uF
5.10V/2.4A
Vout1
C8
2.2µF
5.10V/1.0A
Vout2
C9
2.2µF
OUTPUT VI PROFILE
5.25V
5.10V
4.6V
Vout1
2.50V
Iout1
2.4A 2.9A
5.25V
5.10V
Vout2
4.75V
2.50V
Iout2
1.1A 1.3A
Data Sheet Rev. 2.0, January 19, 2020 | Subject to change without notice
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