EA4523AYH Datasheet, PDF (1/15 Pages) Active-Semi, Inc – Wide-Input Sensorless CC/CV Step-Down DC/DC Converter

ACT4523A
Rev 0, 25-Jul-13
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 12V
• 250kHz Switching Frequency
• 91% Efficiency (Vout = 5V@3.5A at Vin = 12V)
• Patented ActiveCC Sensorless Constant Current
Control
− Integrated Current Control Improves
Efficiency, Lowers Cost, and Reduces
Component Count
• Resistor Programmable
− Current Limit from 1.5A to 4.0A
− Patented Cable Compensation from 0 to
0.25Ω
• ±6.5% 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 CC/CV Supply
GENERAL DESCRIPTION
ACT4523A 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. ACT4523A
provides up to 3.5A output current at 250kHz
switching frequency.
Active CC is a patented control scheme to achieve
highest accuracy with sensorless constant current
control. ActiveCC eliminates the expensive, high
accuracy current sense resistor, making it ideal for
battery charging applications and adaptors with
accurate current limit. The ACT4523A achieves
higher efficiency than traditional constant current
switching regulators by eliminating its associated
power loss on the sensing resistor. ACT4523A
provides OVP pin for output over voltage protection.
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 Power^TM
-1-
CC/CV Curve
6.0
VIN = 12V
5.0
4.0
VIN = 24V
3.0
2.0
1.0
VIN = 18V
0.0
1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
Output Current (A)
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