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Qorvo

ACT4524 Datasheet Preview

ACT4524 Datasheet

40V/3.5A Buck Converter

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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 0
CSN2 CSN1 HSB
IN
SW
ACT4524
CSP
GND CLK MODE
R2
5.1
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
1 of 18
www.qorvo.com




Qorvo

ACT4524 Datasheet Preview

ACT4524 Datasheet

40V/3.5A Buck Converter

No Preview Available !

ACT4524
40V/3.5A Buck Converter with Dual Output
and Separated Over Current Protection
ORDERING INFORMATION
PART NUMBER OPERATION AMBIENT TEMPERATURE RANGE PACKAGE
ACT4524YH-T
-40°C to 85°C
SOP-8EP
PINS
8
PACKING
TAPE & REEL
PIN CONFIGURATION
CSP 1
CSN1 2
CSN2 3
MODE 4
ACT4524
GND
EP
SOP-8EP
8 HSB
7 SW
6 IN
5 CLK
PIN DESCRIPTIONS
PIN
NAME
DESCRIPTION
1
CSP
Voltage Feedback Input. The voltage at this pin is regulated to 5.10V. Connect this pin to the
positive terminal of current sense resistor. CSP, CSN1 and CSN2 Kevin sense is recommended.
2
CSN1 Output current sense. Connect to the negative terminal of current sense resistor for VOUT1.
3
CSN2 Output current sense. Connect to the negative terminal of current sense resistor for VOUT2.
Mode pin with internal pull up current to determine device should operate in Native, Master, or Slave
4
MODE
mode. If the pin is floated, the device operates in native mode; if the pin is grounded ,the
device operates in Slave mode and receives CLK signal from another device; if the pin is
connected to 82kOhm resistor, the device is configured in Master mode.
5
CLK
Synchronization of dual chips. Two chips operate synchronously out of phase with CLK
pin connected.
6
IN
Power Supply Input. Bypass this pin with a 10μF ceramic capacitor to GND, placed as close to the
IC as possible.
7
SW Power switching output to external inductor.
8
HSB
High Side Bias pin. This pin provides power to the internal high-side MOSFET gate driver. Connect
a 22nF capacitor from HSB pin to SW pin.
9
GND
Ground and heat dissipation pad. Connect this exposed pad to large ground copper area and other
ground planes by thermal vias.
Data Sheet Rev. 2.0, January 19, 2020 | Subject to change without notice
2 of 18
www.qorvo.com


Part Number ACT4524
Description 40V/3.5A Buck Converter
Maker Qorvo
PDF Download

ACT4524 Datasheet PDF






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