AT2003
Wide Input sensorless CC/CV 2A Buck Converter
General Description
AT2003 is a wide input voltage, high efficiency step-
down DC/DC converter that operates in either CV (Con-
stant Output Voltage) mode or CC (Constant Output
Current) mode. AT2003 provides up to 3A output current
at 120kHz switching frequency ,and the CC level can be
adjusted by changing external sensing resister.
The AT2003 provides full protection functions, thermal
shutdown is to prevent over temperature operating from
damage; cycle by cycle current limit is against over
current operating of the switch; and over voltage protec-
tion (OVP) that can avoid high Vout voltage to damage
circuit and capacitor.
The devices is available in PSOP8-8L package and
require very few external devices for operation.
Features
Wide Input Voltage with 9V ~ 40V Operation
Up to 3A Output Current
Fixed Frequency 120 kHz with Easy EMI Control
Constant voltage and constant voltage control
Precision Feedback Voltage 1.2V+-1%
Precision CC Limit with +-5% Accuracy
Integrated 140mohm High Side NMOS
Internal MOS 4.5A Current Peak Protected in Cycle
by Cycle Current Limit
PSOP8-8 Package
Applications
Car Charger/Adaptor
General-Purposed DC/DC Converters with
Ordering and Marking Information
Constant Current Limit
Order Number Package
Top Marking
Rechargeable Portable Devices
AT2003SSP8 PSOP-8L
AT2003S
Pin Configuration
Note: Aplustek products are compatible with the current
IPC/JEDEC J-STD-020 requirement. They are halogen-free,
RoHS compliant and 100% matte tin (Sn) plating that are
suitable for use in SnPb or Pb-free soldering processes.
VCC
GND
FB
COMP
GND
LX
BST
SENN
SENP
Aplustek Integrated Circuits Corp.,
Rev. C00, File Name: AT2001-DSC001
www.sntoweb.com 13667868567 杨秋先生
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