(ACTIVE) 3.5V to 36V, 6A Synchronous Step-Down Voltage Converter


Functional Diagram


The LM73605/LM73606 family of devices are easy-to-use synchronous step-down DC-DC converters capable of driving up to 5 A (LM73605) or 6 A (LM73606) of load current from a supply voltage ranging from 3.5 V to 36 V. 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, synchronization 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
    • 0.8 µA in Shutdown (typical)
    • 15 µA in Active Mode with No Load (typical)
  • Wide Voltage Conversion Range:
    • tON_MIN = 60 ns (typical)
    • tOFF_MIN = 70 ns (typical)
  • Low MOSFET ON-Resistance:
    • RDS_ON_HS = 53 mΩ (typical)
    • RDS_ON_LS = 31 mΩ (typical)
  • External Bias Input to Improve Efficiency
  • Pin-Selectable Auto Mode or Forced PWM Operation
  • Adjustable Frequency Range: 350 kHz to 2.2 MHz
  • Synchronizable 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

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Vin (Min) (V) 3.5    
Vin (Max) (V) 36    
Vout (Min) (V) 1    
Vout (Max) (V) 34    
Iout (Max) (A) 6    
Regulated Outputs (#) 1    
Switching Frequency (Min) (kHz) 350    
Switching Frequency (Max) (kHz) 2200    
Iq (Typ) (mA) 0.015    
Features Enable^Forced Pulse Width Modulation (FPWM) Mode^Frequency Synchronization^Light Load Efficiency^Over Current Protection^Power Good^Pre-Bias Start-Up^Synchronous Rectification^Tracking^UVLO Fixed^Wettable Flanks Package    
Control mode Current Mode    
Duty Cycle (Max) (%) 95    
Operating Temperature Range (C) -40 to 125    
Rating Catalog    
Package Group WQFN|30    
Type Converter    

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Technical Documents

Datasheet (1)

User guides (2)

Selection guides (1)

Design files (1)

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