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ACT4533B Datasheet(PDF) 1 Page - Active-Semi, Inc

Part # ACT4533B
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
Logo ACTIVE-SEMI - Active-Semi, Inc

ACT4533B Datasheet(HTML) 1 Page - Active-Semi, Inc

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Innovative Power
TM
- 1 -
www.active-semi.com
Copyright © 2013 Active-Semi, Inc.
FEATURES
40V Input Voltage Surge
36V Steady State Operation
Up to 3.5A output current
Output Voltage up to 12V
125kHz Switching Frequency Eases EMI Design
91% Efficiency (Vout=5V@2.4A at Vin=12V)
Stable with Low-ESR Ceramic Capacitors to
Allow Low-Profile Designs
Integrated Over Voltage Protection
Excellent EMI Performance
Patented ActiveCC Sensorless Constant Current
Control Improves Efficiency and Lowers Cost.
Resistor Programmable
Current Limit from 1.5A to 4.0A
Patented Cable Compensation from 0 to
0.25Ω
±7.5% 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 CV/CC Power Supply
GENERAL DESCRIPTION
ACT4533A/B 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. ACT4533A/B
provides up to 3.5A output current at 125kHz
switching frequency.
ActiveCC is a patented control scheme to achieve
high-accuracy sensorless constant current control.
ActiveCC eliminates the expensive, high accuracy
current sense resistor, making it ideal for CLA
applications.
ACT4533A/B integrates adaptive gate drive to
achieve
excellent
EMI
performance
passing
EN55022 Class B EMC standard without adding
additional EMI components while maintaining high
conversion efficiency.
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.
The only difference between ACT4533A and
ACT4533B is that Pin 7 provides OVP for
ACT4533A and EN/OVP for ACT4533B.
ACT4533A/B
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, 14-Aug-13
VIN = 18V
VIN = 24V
VIN = 12V


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