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ACT4533C Datasheet Preview

ACT4533C Datasheet

Wide-Input Sensorless CC/CV Step-Down DC/DC Converter

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ACT4533C pdf
ACT4533C
Rev 1, 14-Nov-14
Wide-Input Sensorless CC/CV Step-Down DC/DC Converter
FEATURES
40V Input Voltage Surge
36V Steady State Operation
Up to 3.5A output current
Output Voltage up to 18V
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
0.25
±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
ACT4533C 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. ACT4533C
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.
ACT4533C 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.
Innovative PowerTM
-1-
CC/CV Curve
6.0
VIN = 24V
5.0
VIN = 18V
4.0
3.0
VIN = 12V
2.0
1.0
0.0
1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
Output Current (A)
www.active-semi.com
Copyright © 2014 Active-Semi, Inc.



Active-Semi
Active-Semi

ACT4533C Datasheet Preview

ACT4533C Datasheet

Wide-Input Sensorless CC/CV Step-Down DC/DC Converter

No Preview Available !

ACT4533C pdf
ACT4533C
Rev 1, 14-Nov-14
ORDERING INFORMATION
PART NUMBER
ACT4533CYH-T
OPERATION AMBIENT
TEMPERATURE RANGE
-40°C to 85°C
PIN CONFIGURATION
OVP/EN
PIN
OVP
PACKAGE
SOP-8EP
PINS
8
PACKING
TAPE & REEL
PIN DESCRIPTIONS
PIN NAME
DESCRIPTION
1
HSB
High Side Bias Pin. This provides power to the internal high-side MOSFET gate driver.
Connect a 22nF capacitor from HSB pin to SW pin.
2
IN
Power Supply Input. Bypass this pin with a 10µF ceramic capacitor to GND, placed as
close to the IC as possible.
3 SW Power Switching Output to External Inductor.
Ground. Connect this pin to a large PCB copper area for best heat dissipation. Return
4
GND
FB, COMP, and ISET to this GND, and connect this GND to power GND at a single
point for best noise immunity.
5
FB
Feedback Input. The voltage at this pin is regulated to 0.808V. Connect to the resistor
divider between output and GND to set the output voltage.
6
COMP
Error Amplifier Output. This pin is used to compensate the converter.
7
OVP
OVP input. If the voltage at this pin exceeds 0.8V, the IC shuts down high-side switch.
8
ISET
Output Current Setting Pin. Connect a resistor from ISET to GND to program the
output current.
Exposed Pad
Heat Dissipation Pad. Connect this exposed pad to large ground copper area with
copper and vias.
Innovative PowerTM
- 2 - www.active-semi.com
Copyright © 2014 Active-Semi, Inc.


Part Number ACT4533C
Description Wide-Input Sensorless CC/CV Step-Down DC/DC Converter
Maker Active-Semi
Total Page 16 Pages
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