3.5V to 36V, 6A Synchronous Step-Down Voltage Converter - LM73606

LM73606 (ACTIVE)

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

 

Description

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.

Features

  • 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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Parametrics Compare all products in Buck Converter (Integrated Switch)

 
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Regulated Outputs (#)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Features
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
LM73606 LM43603 LM73605 LMR14050 LMS3655 TPS54540
3.5    3.5    3.5    4    3.5    4.5   
36    36    36    40    42    42   
1    1    1    1    1    0.8   
34    28    34    36    15    41.1   
6    3    5    5    5.5    5   
1    1    1    1    1    1   
350    200    350    200    250    100   
2200    2200    2200    2500    500    2500   
0.015    0.027    0.015    0.04    0.015    0.146   
Enable
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Fixed   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification
Tracking   
Enable
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Fixed   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Tracking
UVLO Adjustable   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Synchronous Rectification   
Enable
Frequency Synchronization
Light Load Efficiency
UVLO Adjustable   
Current Mode    Current Mode    Current Mode    Current Mode    Current Mode    Current Mode   
95    99    96    98    98    98   
-40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125   
Catalog    Catalog    Catalog    Catalog    Catalog    Catalog   
WQFN    HTSSOP
SON   
WQFN    SO PowerPAD    VQFN-HR    SO PowerPAD   
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WEBENCH® Designer LM73606

  Min   Max Range
Vin  V 3.5 to 36.0V
Vout  V 1 to 34V
Iout  A ≤ 6A
Ambient Temp  °C -40 to 125°C


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