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AT2003 Dataheets PDF



Part Number AT2003
Manufacturers Aplustek Integrated Circuits
Logo Aplustek Integrated Circuits
Description Wide Input sensorless CC/CV 2A Buck Converter
Datasheet AT2003 DatasheetAT2003 Datasheet (PDF)

AT2003 Wide Input sensorless CC/CV 2A Buck Converter General Description AT2003 is a wide input voltage, high efficiency stepdown DC/DC converter that operates in either CV (Constant 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 dam.

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AT2003 Wide Input sensorless CC/CV 2A Buck Converter General Description AT2003 is a wide input voltage, high efficiency stepdown DC/DC converter that operates in either CV (Constant 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 protection (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 , 1 Typical Application Circuit AT2003 VCC=9~40V C IN AT2003 C BST LOUT R SENSE VOUT C OUT Aplustek Integrated Circuits Corp., Rev. C00, File Name: AT2001-DSC001 www.sntoweb.com 13667868567 , 2 Function Blocks VCC AT2003 FB COMP SENP Regulator 5V 0.4V 1.45V 1.2V UVP OVP CV loop OTP POR OCP Fault Logics Ramp 120KHz CC loop LX 5V Duty Logics Driver BST LX GND SENN Function Pin Description No. Pin Name Pin Function 1 VCC Power Supply Input. Bypass this pin with a 0.1uF ceramic capacitor to GND, placed as close to the IC as possible. 2 GND Ground. 3 FB Feedback Input. The voltage at this pin is regulated to 1.2V.Connect to resistor divider between output and GND to set the output voltage. 4 COMP Error Amplifier output Pin.The pin is used to compensate the converter. 5 SENP Current sense positive input pin. 6 SENN Current sense negative input pin. 7 BST Bootstrap Bias Pin. It provides power to the internal high-side MOSFET gate driver. Connect a 0.1uF capacitor from BST to LX pin. 8 LX Power Switching Output to external Inductor. Aplustek Integrated Circuits Corp., Rev. C00, File Name: AT2001-DSC001 www.sntoweb.com 13667868567 , 3 AT2003 Absolute Maximum Ratings (Note1) Supply Input Voltage, VCC ------------------------------------------------------------------------------------------- -0.3V to +44V BST to LX ----------------------------------------------------------------------------------------------------------- - 0.3V to +7V LX to GND DC ----------------------------------------------------------------------------------------------------- -0.3V to +44V FB,COMP to GND DC ---------------------------------------------------------------------------------------------- -0.3V to +7V Storage Temperature Range ------------------------------------------------------------------------------------------- -65OC to +150OC Junction Temperature ----------------------------------------------------------------------------------------------------------- -40OC to +150OC Lead Temperature Range(Soldering 10sec) ------------------------------------------------------------------------------------------ 260OC ESD Rating (Note2) HBM(Human Body Mode)-------------------------------------------------------------------------------------------------------------2KV MM(Mechine Mode)-----------------------------------------------------------------------------------------------------------------------------200V Thermal Characteristics Package Thermal Resistance (Note3) PSOP-8L θJA ------------------------------------------------------------------------------------------------------------------------ 50OC/W PSOP-8L θJC ------------------------------------------------------------------------------------------------------------------------- 5OC/W Power Dissipation, PD @ TA = 25°C PSOP-8L ------------------------------------------------------------------------------------------------------------------------ 2.0W Electrical Characteristics ( VCC = 12V, TA = +25OC unless otherwise specified.) Parameter Symbol Test Conditions Min Typ Max Units Supply Input Section VCC operation range VCC UVLO threshold VCC operation current Oscillation Sectio.


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