SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator - LM2676

LM2676 (ACTIVE)

SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator

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 LM2676 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 LM2676 are available from several manufacturers to greatly simplify the design process.

The LM2676 series also has built in thermal shutdown, current limiting and an ON/OFF control input that can power down the regulator to a low 50μA quiescent current standby condition. 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)
  • 150 mΩ DMOS Output Switch
  • 3.3V, 5V and 12V Fixed Output and Adjustable (1.2V to 37V) Versions
  • 50μA Standby Current When Switched OFF
  • ±2% Maximum Output Tolerance Over Full Line and Load Conditions
  • Wide Input Voltage Range: 8V to 40V
  • 260 KHz Fixed Frequency Internal Oscillator
  • −40 to +125°C Operating Junction Temperature Range

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
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$)
LM2676 LM2596 LM2576 LM2576HV LM2678 LM2679 LM2673 LM2677 TPS62085 LM2670 TPS54427 TPS54428 TPS54335
                1            
                2.5            
                6            
                0.8            
                6            
3     3     3     3     5     5     3     5     3     3     4     4     3    
                Buck            
                4.6            
4.2           4.2     4.2     4.2     4.2     0.017     4.2     0.95     0.95     0.6    
91           91     91     91     91     100     91     95     95     90    
                Fixed            
Internal     Internal     Internal     Internal     Internal     Internal     Internal     Internal     Internal     Internal     Not Needed     Not Needed     External    
                Enable
Light Load Efficiency
Output Discharge
Power Good
Synchronous Rectification    
       
SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     DCS-Control     SIMPLE SWITCHER     SWIFT     SWIFT     SWIFT    
Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode       Voltage Mode     D-CAP2     D-CAP2     Current Mode    
                1            
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
-40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 85     -40 to 125     -40 to 85     -40 to 85     -40 to 85    
14VSON
7DDPAK/TO-263
7TO-220    
5DDPAK/TO-263
5TO-220    
5DDPAK/TO-263
5TO-220    
5DDPAK/TO-263
5TO-220    
14VSON
7DDPAK/TO-263
7TO-220    
14VSON
7DDPAK/TO-263
7TO-220    
14VSON
7DDPAK/TO-263
7TO-220    
14VSON
7DDPAK/TO-263
7TO-220    
7VSON     14VSON
7DDPAK/TO-263
7TO-220    
10VSON
8SO PowerPAD    
10VSON
8SO PowerPAD    
10VSON
8SO PowerPAD    
1.80 | 1ku     1.80 | 1ku     1.19 | 1ku     2.30 | 1ku     2.20 | 1ku     2.25 | 1ku     1.85 | 1ku     2.25 | 1ku     1.05 | 1ku     1.85 | 1ku     0.90 | 1ku     0.92 | 1ku     0.90 | 1ku    

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WEBENCH® LM2676
    Min   Max   Range  
  Vin V    8.00 – 40.00V  
  Vout V    1.21 – 40.00V  
  Iout A    ≤ 3A  
  Ambient Temp °C    -40 – 125°C  
Footprint BOM Cost Efficiency
 
   
 
 
'IC Cinx Cb Rfb1 Rfb2 D1 L1 Cout Cin '
 
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