3A Step-Down Voltage Regulator with Adjustable Current Limit - LM2673

LM2673 (ACTIVE)

3A Step-Down Voltage Regulator with Adjustable Current Limit

Recommended alternative parts

  • LM43603  - The device has SIMILAR FUNCTIONALITY but is not functionally equivalent to the compared device.   Synchronous 36V, 3A Regulator - Higher efficiency, Low Quiescent Current, Smaller Solution Size

Description

The LM2673 series of regulators are monolithic integrated circuits which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 3A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance DMOS power switch. The series consists of fixed output voltages of 3.3V, 5V and 12V and an adjustable output version.

The SIMPLE SWITCHER concept provides for a complete design using a minimum number of external components. A high fixed frequency oscillator (260KHz) allows the use of physically smaller sized components. A family of standard inductors for use with the LM2673 are available from several manufacturers to greatly simplify the design process.

Other features include the ability to reduce the input surge current at power-ON by adding a softstart timing capacitor to gradually turn on the regulator. The LM2673 series also has built in thermal shutdown and resistor programmable current limit of the power MOSFET switch to protect the device and load circuitry under fault conditions. The output voltage is ensured to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.

Features

  • Efficiency Up to 94%
  • Simple and Easy to Design with (Using Off-The-Shelf External Components)
  • Resistor Programmable Peak Current Limit Over a Range of 2A to 5A
  • 150 mΩ DMOS Output Switch
  • 3.3V, 5V and 12V Fixed Output and Adjustable (1.2V to 37V) Versions
  • ±2% Maximum Output Tolerance Over Full Line and Load Conditions
  • Wide Input Voltage Range: 8V to 40V
  • 260 KHz Fixed Frequency Internal Oscillator
  • Softstart Capability
  • −40 to +125°C Operating Junction Temperature Range

SIMPLE SWITCHER is a trademark of Texas Instruments. All trademarks are the property of their respective owners. SIMPLE SWITCHER is a trademark of Texas Instruments. Switchers Made Simple is a trademark of Texas Instruments.

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Parametrics Compare all products in Step-Down (Buck) Converter

 
Regulated Outputs (#)
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Topology
Switching Frequency (Max) (kHz)
Switch Current Limit (Typ) (A)
Iq (Typ) (mA)
Duty Cycle (Max) (%)
Soft Start
Compensation
Special Features
Brand
Control Mode
Vref Accuracy (Typ) (%)
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM2673 LM2596 LM2599 LM43603 LMR14030
1     1     1     1     1    
8     4.5     4.5     3.5     4    
40     40     40     36     40    
1.23     3.3     3.3     1     1    
37     37     37     28     36    
3     3     3     3     3.5    
Buck     Buck     Buck     Buck     Buck
Inverting Buck-Boost    
260     173     173     2200     2500    
4.5     4.5         5.5    
4.2     5     5     0.027     0.04    
91     100       99     97    
Adjustable     None       Adjustable
Fixed    
Adjustable    
Internal     Internal     Internal     Internal     Internal    
Enable     Enable     Power Good     Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification
Tracking    
Adjustable UVLO
Enable
Frequency Synchronization
Light Load Efficiency
Pre-Bias Start-Up    
SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER    
Voltage Mode     Voltage Mode     Voltage Mode     Current Mode     Current Mode    
2     4     4     1.8     2    
Catalog     Catalog     Catalog     Catalog     Catalog    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
14VSON
7DDPAK/TO-263
7TO-220    
5DDPAK/TO-263
5TO-220    
7DDPAK/TO-263
7TO-220    
16HTSSOP     8SO PowerPAD    
1.85 | 1ku     1.80 | 1ku     2.05 | 1ku     1.85 | 1ku     1.68 | 1ku    

Related end equipment

  • Simple to Design, High Efficiency (>90%) Step-Down Switching Regulators
  • Efficient System Pre-Regulator for Linear Voltage Regulators
  • Battery Chargers

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WEBENCH® LM2673
    Min   Max   Range  
  Vin V 8.0 to 40.0V  
  Vout V 1.21 to 40.0V  
  Iout A ≤ 3A  
  Ambient Temp °C -40 to 125°C  
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