LM73605 3.5V to 36V, 5A Synchronous Step-Down Voltage Converter | TI.com

LM73605 (ACTIVE)

3.5V to 36V, 5A Synchronous Step-Down Voltage Converter

 

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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 converters (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
Type
Package size: mm2:W x L (PKG)
LM73605 LM73606 LMR14050 LMS3655 TPS54540B TPS54540B-Q1 TPS54541
3.5     3.5     4     3.5     4.5     4.5     4.5    
36     36     40     42     42     42     42    
1     1     1     1     0.8     0.8     0.8    
34     34     36     15     41.1     41.1     41    
5     6     5     5.5     5     5     5    
1     1     1     1     1     1     1    
350     350     200     250     100     100     100    
2200     2200     2500     500     2500     2500     2500    
0.015     0.015     0.04     0.015     0.146     0.146     0.152    
Enable
Forced PWM
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking
UVLO Fixed
Wettable Flanks Package
Soft Start Adjustable    
Enable
Forced PWM
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking
UVLO Fixed
Wettable Flanks Package    
Enable
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Pre-Bias Start-Up
Tracking
UVLO Adjustable    
Enable
Forced PWM
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Pre-Bias Start-Up
Spread Spectrum
Synchronous Rectification
Wettable Flanks Package    
Enable
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Pre-Bias Start-Up
Soft Start Fixed
Wettable Flanks Package    
Enable
Frequency Synchronization
Light Load Efficiency
Over Current Protection
UVLO Adjustable    
Enable
Frequency Synchronization
Light Load Efficiency
Over Current Protection
Power Good
Tracking
UVLO Adjustable    
Current Mode     Current Mode     Current Mode     Current Mode     Current Mode     Current Mode     Current Mode    
96     95     98     98     98     98     98    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 150     -40 to 125     -40 to 85    
Catalog     Catalog     Catalog     Catalog     Catalog     Automotive     Catalog    
WQFN | 30     WQFN | 30     SO PowerPAD | 8     VQFN-HR | 22     SO PowerPAD | 8     SO PowerPAD | 8     WSON | 10    
Converter     Converter     Converter     Converter     Converter     Converter     Converter    
30WQFN: 24 mm2: 4 x 6 (WQFN | 30)     30WQFN: 24 mm2: 4 x 6 (WQFN | 30)     8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)     22VQFN-HR: 20 mm2: 4 x 5 (VQFN-HR | 22)     8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)     8SO PowerPAD: 19 mm2: 3.9 x 4.89 (SO PowerPAD | 8)     See datasheet (WSON)