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Numéro de sérieLT3653
CategoriePower Management => Battery Management => Battery Chargers
Description1.2A, HV Input Regulator With Output Current Limit For Battery Charger Applications
The LT3653 is a monolithic current mode PWM step-down regulator with programmable output current limit. Typically, it is used with battery charger power path controllers to pre-regulate the output and optimize the battery charger efficiency. Output current limit provides accurate control over system power dissipation.

The wide operating input voltage range of 7.5V to 30V suits the LT3653 to a variety of input sources, including unregulated 12V wall adapters, 24V industrial supplies, Firewire and automotive power. Input overvoltage protection allows the LT3653 to handle 60V input transients.
SociétéLinear Technology Corporation
DatasheetTélécharger LT3653 datasheet
 
 
  • Description courte
  • FEATURES
    1.2A, HV Input Regulator with Output Current Limit for Battery Charger Applications DESCRIPTION

    The is a monolithic current mode PWM step-down regulator with programmable output current limit. Typically, it is used with battery charger power path controllers to pre-regulate the output and optimize the battery charger efficiency. Output current limit provides accurate control over system power dissipation. The wide operating input voltage range to 30V suits the to a variety of input sources, including unregulated 12V wall adapters, 24V industrial supplies, Firewire and automotive power. Input overvoltage protection allows the LT3653 to handle 60V input transients. The LT3653 control pin, , is available for external battery tracking control, Bat-Track. The LT3653 will block output discharge during an open or shorted input. The HVOK pin indicates that the internal bias supplies are present and no faults have occurred (i.e., overtemperature and input overvoltage and undervoltage). The LT3653 includes a 1.5MHz frequency oscillator, internal compensation, and an internal boost diode to minimize the number of external components. The LT3653 is available × 3mm) package with exposed pads for low thermal resistance.

    Wide Input Range: ­ Operation from 30V ­ Overvoltage Lockout Protects Circuit Through 60V Transients Operates with LTC Bat-TrackTM Li-Ion Battery Chargers to Maximize Efficiency No Reverse Discharge Path from VOUT to VIN Programmable Output Current Limit Integrated BOOST Diode Thermal Protection Small Application Size Thermally Enhanced × 3mm DFN Package

    APPLICATIONS

    Battery Powered Equipment Portable USB Devices ­ Cameras, MP3 Players, PDAs Automotive Battery Regulation Multiple-Source Battery Chargers

    , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Bat-Track is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.

    High Voltage Single-Cell Battery Charger Application
    TOP VIEW VIN 1 HVOK VC 3 ILIM SW 7 BOOST 6 ISENSE 5 VOUT

    Input Voltage (VIN) (Note 3)......................................60V Boost Pin Voltage (BOOST).......................................50V Boost Pin Above SW Pin...........................................25V HVOK, VOUT, ISENSE VC Pin.........................................................................3V Operating Junction Temperature Range (Notes to 125°C Storage to 150°C

    DCB PACKAGE s 3mm) PLASTIC DFN = 10°C/W EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB

    LEAD FREE FINISH LT3653EDCB#PBF LT3653IDCB#PBF TAPE AND REEL LT3653EDCB#TRPBF LT3653IDCB#TRPBF PART MARKING* LDJN PACKAGE DESCRIPTION × 3mm) Plastic DFN × 3mm) Plastic DFN TEMPERATURE RANGE to 125°C

    Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

    The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are = 25°C; VIN = 12V, VBOOST = 17V, VSW = 0V, RILIM = 33.2k, unless otherwise noted.

    PARAMETER VIN Operating Range VIN Undervoltage Lockout VIN Undervoltage Hysteresis VIN Overvoltage Lockout VIN Overvoltage Lockout Hysteresis VIN Supply Current VOUT Reverse Leakage Current VOUT Nominal Set Point VOUT Current Limit Range VOUT Current Limit Operating Frequency VC Source Current VC Sink Current VC Switching Threshold VOUT = 1.5V VOUT = 1.5V IOUT = 0mA RILIM = 33.2k Not Switching VIN = 0V, VOUT = 4.8V VIN = Open, VOUT 4.8V VC Pin = Open

    PARAMETER VC Clamp Voltage Switch Peak Current Limit Switch VCESAT Boost Diode Drop Boost Pin Current HVOK Output Voltage High HVOK Output Voltage Low CONDITIONS VOUT = 0V (Note 4) ISW = 1A IDIODE = 60mA ISW = 1A IHVOK = 1mA IHVOK = ­2A

    The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are = 25°C; VIN = 12V, VBOOST = 17V, VSW = 0V, RILIM = 33.2k, unless otherwise noted.

    Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LT3653E is guaranteed to meet performance specifications from to 125°C. Specifications over the to 125°C operating temperature range are assured by design, characterization, and correlation with statistical process controls. The LT3653I specifications are guaranteed over the full to 125°C temperature range. High junction temperatures degrade operating lifetimes. Operating lifetime is derated at junction temperatures greater than 125°C.

    Note 3: Absolute Maximum Voltage at VIN pin is 60V for non-repetitive 1 second transients. Note 4: Switch Peak Current Limit guaranteed by design and/or correlation to static test. Note 5: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed the maximum operating junction temperature when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability.