3.5V to 36V, 5A synchronous step-down voltage converter

23rd August 2018
Posted By : Enaie Azambuja
3.5V to 36V, 5A synchronous step-down voltage converter

Texas Instruments' LM73605/LM73606 family of devices are easy-to-use synchronous step-down DC/DC converters capable of driving up to 5A (LM73605) or 6A (LM73606) of load current from a supply voltage ranging from 3.5V to 36V. The LM73605/LM73606 provide exceptional efficiency and output accuracy in a very small solution size. Peak current-mode control is employed.

Additional features such as adjustable switching frequency, synchronisation to an external clock, FPWM option, power-good flag, precision enable, adjustable soft start, and tracking provide both flexible and easy-to-use solutions for a wide range of applications.

Automatic frequency foldback at light load and optional external bias improve efficiency over the entire load range. The family requires few external components and has a pinout designed for simple PCB layout with optimal EMI and thermal performance.

Protection features include thermal shutdown, input undervoltage lockout, cycle-by-cycle current limiting, and hiccup short-circuit protection. The LM73605 and LM73606 devices are pin-to-pin compatible for easy current scaling.

Features

  • Synchronous Rectification
  • Wettable Flanks QFN Package (WQFN)
  • Low Quiescent Current
  • 0.8µA in Shutdown (typical)
  • 15µA in Active Mode with No Load (typical)
  • Wide Voltage Conversion Range:
  • tON_MIN = 60ns (typical)
  • tOFF_MIN = 70ns (typical)
  • Low MOSFET ON-Resistance:
  • RDS_ON_HS = 53mΩ (typical)
  • RDS_ON_LS = 31mΩ (typical)
  • External Bias Input to Improve Efficiency
  • Pin-Selectable Auto Mode or Forced PWM Operation
  • Adjustable Frequency Range: 350kHz to 2.2MHz
  • Synchronisable to External Clock
  • Internal Compensation
  • Power-Good Flag
  • Precision Enable to Program System UVLO
  • Flexible Soft-Start Features:
  • Start-up into Pre-Biased Load
  • Fixed or Adjustable Soft-Start Time
  • Output Voltage Tracking
  • Cycle-by-Cycle Current Limiting
  • Short-Circuit Protection With Hiccup Mode
  • Thermal Shutdown Protection
  • Create a Custom Design With the WEBENCH Power Designer using LM73605 or LM73606

Discover more here.


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