LM22674 SIMPLE SWITCHER® 4.5V to 42V, 0.5A Step-Down DC/DC Switching Regulator with Precision Enable | TI.com

LM22674 (ACTIVE)

SIMPLE SWITCHER® 4.5V to 42V, 0.5A Step-Down DC/DC Switching Regulator with Precision Enable


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The LM22674 switching regulator provides all of the functions necessary to implement an efficient high voltage step-down (buck) regulator using a minimum of external components. This easy to use regulator incorporates a 42 V N-channel MOSFET switch capable of providing up to 500 mA of load current. Excellent line and load regulation along with high efficiency (> 90%) are featured. Voltage mode control offers short minimum on-time, allowing the widest ratio between input and output voltages. Internal loop compensation means that the user is free from the tedious task of calculating the loop compensation components. Fixed 5 V output and adjustable output voltage options are available. A switching frequency of 500 kHz allows for small external components and good transient response. A precision enable input allows simplification of regulator control and system power sequencing. In shutdown mode the regulator draws only 25 µA (typ). Built in soft-start (500 µs, typ) saves external components. The LM22674 also has built in thermal shutdown, and current limiting to protect against accidental overloads.

The LM22674 device is a member of Texas Instruments’ SIMPLE SWITCHER® family. The SIMPLE SWITCHER® concept provides for an easy to use complete design using a minimum number of external components and the TI WEBENCH® design tool. TI’s WEBENCH® tool includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards for easy design-in.


  • Wide Input Voltage Range: 4.5 V to 42 V
  • Internally Compensated Voltage Mode Control
  • Stable with Low ESR Ceramic Capacitors
  • 200 mΩ N-Channel MOSFET
  • Output Voltage Options:
    -ADJ (Outputs as Low as 1.285 V)
    -5.0 (Output Fixed to 5 V)
  • ±1.5% Feedback Reference Accuracy
  • Switching Frequency of 500 kHz
  • –40°C to 125°C Operating Junction
    Temperature Range
  • Precision Enable Pin
  • Integrated Boot-Strap Diode
  • Integrated Soft-Start
  • Fully WEBENCH® Enabled
  • LM22674-Q1 is an Automotive Grade Product
    that is AEC-Q100 Grade 1 Qualified
    (–40°C to +125°C Operating Junction
  • SO PowerPAD (Exposed Pad)

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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)
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Package Group
LM22674 LM22675 LM22675-Q1 LM22676
4.5     4.5     4.5     4.5    
42     42     42     42    
1.285     1.285     1.285     1.285    
37     37     37     37    
0.5     1     1     3    
1     1     1     1    
500     500     500     500    
500     500     500     500    
3.4     3.4     3.4     3.4    
Enable     Enable     Enable     Enable    
Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode    
90     90     90     90    
-40 to 125     -40 to 125     -40 to 125     -40 to 125    
Catalog     Catalog     Automotive     Catalog    
SO PowerPAD | 8     SO PowerPAD | 8     SO PowerPAD | 8     SO PowerPAD | 8
TO-263 | 7    
Converter     Converter     Converter     Converter    

Design tool

WEBENCH® Designer LM22674

  Min   Max Range
Vin  V 4.5 to 42V
Product Option
Vout  V 5 to 5V
Iout  A ≤ .5A
Ambient Temp  °C -40 to 125°C