SIMPLE SWITCHER® 4.5V to 42V, 1A Step-Down DC/DC Switching Regulator with Precision Enable - LM22675

LM22675 (ACTIVE)

SIMPLE SWITCHER® 4.5V to 42V, 1A Step-Down DC/DC Switching Regulator with Precision Enable

 

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Description

The LM22675 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 1 A 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 LM22675 also has built in thermal shutdown, and current limiting to protect against accidental overloads.

The LM22675 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.

Features

  • 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
  • Step-Down and Inverting Buck-Boost Applications
  • LM22675Q is an Automotive Grade Product
    that is AEC-Q100 Grade 1 Qualified (–40°C to +125°C
    Operating Junction Temperature)
  • SO PowerPAD-8 (Exposed Pad) Package

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Parametrics Compare all products in Buck Converter (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)
Features
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
LM22675 LM22671 LM22672 LM22674 LM22675-Q1 LM22676 LM22677 LM22678 LM22679 LM22680 LM22680-Q1
4.5    4.5    4.5    4.5    4.5    4.5    4.5    4.5    4.5    4.5    4.5   
42    42    42    42    42    42    42    42    42    42    42   
1.285    1.285    1.285    1.285    1.285    1.285    1.285    1.285    1.285    1.285    1.285   
37    37    37    37    37    37    37    37    37    37    37   
1    0.5    1    0.5    1    3    5    5    5    2    2   
1    1    1    1    1    1    1    1    1    1    1   
500    200    200    500    500    500    200    500    500    200    200   
500    1000    1000    500    500    500    1000    500    500    1000    1000   
3.4    3.4    3.4    3.4    3.4    3.4    3.4    3.4    3.4    3.4    3.4   
Enable    Enable    Enable    Enable    Enable    Enable    Enable    Enable    Adjustable Current Limit    Enable
Frequency Synchronization   
Enable
Frequency Synchronization   
Voltage Mode    Voltage Mode    Voltage Mode    Voltage Mode    Voltage Mode    Voltage Mode    Voltage Mode    Voltage Mode    Voltage Mode    Voltage Mode    Voltage Mode   
90    90    90    90    90    90    90    90    90    90    90   
-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 125    -40 to 125    -40 to 125   
Catalog    Catalog    Catalog    Catalog    Automotive    Catalog    Catalog    Catalog    Catalog    Catalog    Automotive   
SO PowerPAD    SO PowerPAD    SO PowerPAD    SO PowerPAD    SO PowerPAD    SO PowerPAD
TO-263   
TO-263    TO-263    TO-263    SO PowerPAD    SO PowerPAD   

Other qualified versions of LM22675

Version Part Number Definition
Automotive LM22675-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects
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WEBENCH® Designer LM22675

  Min   Max Range
Vin  V 4.5 to 42.0V
Vout  V 1.28 to 37.0V
Iout  A ≤ 1A
Ambient Temp  °C -40 to 125°C


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