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


SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator

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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.


  • 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 Evaluate all products in Step-Down (Buck) Converter

  LM2676 Compare
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Regulated Outputs (#) 1
Vin (Min) (V) 8
Vin (Max) (V) 40
Vout (Min) (V) 1.23
Vout (Max) (V) 37
Iout (Max) (A) 3
Iout2 (Max) (A) -
Vout2 (Min) (V) -
Vout2 (Max) (V) -
Topology Buck
  • Boost
  • Buck
  • Buck-Boost
  • Inverting Buck-Boost
Switching Frequency (Max) (kHz) 260
Switch Current Limit (Typ) (A) 4.5
Iq (Typ) (mA) 4.2
Duty Cycle (Max) (%) 91
Soft Start Fixed
  • Adjustable
  • Fixed
  • None
Compensation Internal
  • External
  • Internal
  • Not Needed
Special Features Enable
  • Adjustable Current Limit
  • Adjustable UVLO
  • Dynamic Voltage Scaling
  • Enable
  • Frequency Synchronization
  • Light Load Efficiency
  • Phase Interleaving
  • Power Good
  • Synchronous Rectification
  • Tracking
Control Mode Voltage Mode
  • COT with emulated ripple
  • Constant on-time (COT)
  • Current Mode
  • D-CAP
  • D-CAP+
  • D-CAP2
  • D-CAP3
  • Voltage Mode
Preset Vout (V) -
Vref Accuracy (Typ) (%) 2
Rating Catalog
  • Automotive
  • Catalog
  • HiRel Enhanced Product
  • High Temp
  • Military
  • Space
Operating Temperature Range (C) -40 to 125 °C to °C
Approx. Price (US$) 1.80 | 1ku
Package Group DDPAK/TO-263
  • CFP
  • DDPAK/TO-263
  • MSOP-PowerPAD
  • PDIP
  • QFN
  • SO PowerPAD
  • SOIC
  • SON
  • SOT
  • SOT-23
  • TO-220
  • TO-263
  • USON
  • VQFN
  • VSON
  • WQFN
  • WSON
  Sample & Buy Reset Update

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    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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