LM73605 (ACTIVE)

3.5V to 36V, 5A 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
LM73605 LM43603 LM73606 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   
5    3    6    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
Forced Pulse Width Modulation (FPWM) Mode
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Fixed
Wettable Flanks Package   
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification
Tracking   
Enable
Forced Pulse Width Modulation (FPWM) Mode
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Pre-Bias Start-Up
Synchronous Rectification
UVLO Fixed
Wettable Flanks Package   
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   
96    99    95    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 LM73605

  Min   Max Range
Vin  V 3.5 to 36.0V
Vout  V 1 to 34V
Iout  A ≤ 5A
Ambient Temp  °C -40 to 125°C


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