Depending on the application requirements, the L5973D step-down monolithic power switching regulator can send more than 2 A of DC current to the load with a minimum switch current limit of 2.5 A. From 1.235 V to 35 V can be selected as the output voltage. The high current level is also made possible by an exposed-frame SO8 package, which allows for a reduction in Rth(j-amb) to about 40 °C/W.

To reduce the size of the external components, the device uses an internal P-channel D-MOS transistor (with a typical Rdson of 250 m) as the switching element. 250 kHz is the fixed switching frequency set by an internal oscillator.

• 2.5 A internal switch

  
  

• Operating input voltage from 4 V to 36 V

  
  

• 3.3 V / (±2%) reference voltage

  
  

• Output voltage adjustable from 1.235 V to 35 V

  
  

• Low dropout operation: 100 % duty cycle

  
  

• 250 kHz internally fixed frequency

  
  

• Voltage feedforward

  
  

• Zero load current operation

  
  

• Internal current limiting

  
  

• Inhibit for zero current consumption

  
  

• Synchronization

  
  

• Protection against feedback disconnection

  
  

• Thermal shutdown

  
  

  
  

  
  

  L5973D013TR Applications

  
  

  • Consumer: STB, DVD, TV, VCR, car radio, LCD monitors

    
    

  • Networking: XDSL, modems, DC-DC modules

    
    

  • Computer: printers, audio/graphic cards, optical storage, hard disk drive

    
    

  • Industrial: changers, car battery, DC-DC converters

    
    

    
    

    Lifecycle Status	ACTIVE (Last Updated: 7 months ago)
    Factory Lead Time	11 Weeks
    Mount	Surface Mount
    Mounting Type	Surface Mount
    Package / Case	8-SOIC (0.154, 3.90mm Width) Exposed Pad
    Number of Pins	8
    Operating Temperature	-40°C~150°C TJ
    Packaging	Tape & Reel (TR)
    JESD-609 Code	e3
    Part Status	Active
    Moisture Sensitivity Level (MSL)	3 (168 Hours)
    Number of Terminations	8
    ECCN Code	EAR99
    Terminal Finish	Matte Tin (Sn)
    Terminal Position	DUAL
    Terminal Form	GULL WING
    Peak Reflow Temperature (Cel)	260
    Time@Peak Reflow Temperature-Max (s)	30
    Base Part Number	L5973
    Function	Step-Down
    Number of Outputs	1
    Efficiency	90 %
    Voltage - Input (Max)	36V
    Output Voltage	35V
    Output Type	Adjustable
    Max Output Current	3.5A
    Operating Supply Voltage	25V
    Voltage - Input (Min)	4V
    Input Voltage-Nom	12V
    Analog IC - Other Type	SWITCHING REGULATOR
    Output Configuration	Positive
    Current - Output	2.5A
    Max Output Voltage	35V
    Voltage - Output (Min/Fixed)	1.235V
    Topology	Buck
    Control Mode	VOLTAGE-MODE
    Frequency - Switching	250kHz
    Synchronous Rectifier	No
    Min Output Voltage	1.235V
    Height	1.25mm
    Length	5mm
    Width	4mm
    REACH SVHC	No SVHC
    RoHS Status	ROHS3 Compliant
    Lead Free	Lead Free