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.


  • 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.

You must be logged in to comment

Write a comment

No comments

Sign up to view our publications

Sign up

Sign up to view our downloads

Sign up

Girls in Tech | Catalyst | 2019
4th September 2019
United Kingdom The Brewery, London
DSEI 2019
10th September 2019
United Kingdom EXCEL, London
EMO Hannover 2019
16th September 2019
Germany Hannover
Women in Tech Festival 2019
17th September 2019
United Kingdom The Brewery, London
European Microwave Week 2019
29th September 2019
France Porte De Versailles Paris