EA4524YH Datasheet, PDF (1/16 Pages) Active-Semi, Inc – 40V/3.5A Buck Converter with Dual Output and Separated Over Current Protection

ACT4524
Rev 1.1, 22-Feb-16
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
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.
 Car Charger
 Cigarette Lighter Adaptor (CLA)
 Rechargeable Portable Device
 CV/CC regulation DC/DC converter
Typical Application Circuit
6.0V to 36V
C1
C2 C3
47µ F 0.1µ F 10µ F
R1 0Ω
CSN2 CSN1 HSB
IN
SW
ACT4524
CSP
GND CLK MODE
R2
5.1Ω
C5
2.2nF
C4
22nF
L1 33µ H
D1
S54
C6
10µ F
Rcs1
25m
Rcs2
50m
C7
220uF
5.10V/2.4A
Vout1
C8
2.2µ F
5.10V/1.0A
Vout2
C9
2.2µ F
Output VI Profile
5.25V
5.10V
Vout1
4.6V
2.50V
5.25V
5.10V
Vout2
4.75V
Iout1
2.4A 2.9A
Innovative Power^TM
2.50V
-1-
Iout2
1.1A 1.3A
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