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

LM2673 (ACTIVE)

3A Step-Down Voltage Regulator with Adjustable Current Limit

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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 LM22673 LM25576 LM25576-Q1 LM5576 LM5576-Q1
1     1     1     1     1     1    
8     4.5     6     6     6     6    
40     42     42     42     75     75    
1.23     1.285     1.23     1.23     1.23     1.23    
37     37     40     40     70     70    
3     3     3     3     3     3    
Buck     Buck     Buck     Buck     Buck     Buck    
260     500     1000     1000     500     500    
4.5     4.2     4.2     4.2     4.2     4.2    
4.2     3.4     1     1     1     1    
91     90     95     95     95     95    
Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable    
Internal     Internal     External     External     External     External    
Enable       Enable
Tracking    
Enable     Enable
Tracking    
Enable    
SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER    
Voltage Mode     Voltage Mode     Current Mode     Current Mode     Current Mode     Current Mode    
2     1.5     1.5     1.5     1.5     1.5    
Catalog     Catalog     Catalog     Automotive     Catalog     Automotive    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
14VSON
7DDPAK/TO-263
7TO-220    
7TO-263
8SO PowerPAD    
20HTSSOP     20HTSSOP     20HTSSOP     20HTSSOP    
1.85 | 1ku     1.85 | 1ku     2.00 | 1ku     2.30 | 1ku     2.60 | 1ku     3.15 | 1ku    

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WEBENCH® LM2673
    Min   Max   Range  
  Vin V    8.00 – 40.00V  
  Vout V    1.21 – 40.00V  
  Iout A    ≤ 3.00A  
  Ambient Temp °C    ≤ 100°C  
Footprint BOM Cost Efficiency
 
 
 
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