LM22670 - 3A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Synchronization or Adjustable Switching Frequency

Datasheet Packaging Samples & Pricing Eval. Boards Design Tools Application Notes Knowledge Base

Features


•Wide input voltage range: 4.5V to 42V
•Internally compensated voltage mode control
•Stable with low ESR ceramic capacitors
•120 mΩ N-channel MOSFET TO-263 THIN package
•100 mΩ N-channel MOSFET PSOP-8 package
•Output voltage options:
• -ADJ (outputs as low as 1.285V)
• -5.0 (output fixed to 5V)
•±1.5% feedback reference accuracy
•Switching frequency of 500 kHz, adjustable between 200 kHz and 1 MHz
•-40°C to 125°C operating junction temperature range
•Precision enable pin
•Integrated boot diode
•Integrated soft-start
•Fully WEBENCH ® enabled
•Step-down and inverting buck-boost applications

General Description

The LM22670 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. More...


Applications

•Industrial Control
•Telecom and Datacom Systems
•Embedded Systems
•Automotive Telematics and Body Electronics
•Conversions from Standard 24V, 12V and 5V Input Rails
  Typical Application
click for larger image


Parametric Table     expand
Parametric Table    collapse
Output Current 3000 mA
Input Min Voltage 4.5 Volt
Input Max Voltage 42 Volt
Output Min 1.285 Volt
Frequency Min 200 kHz
Frequency Max 1000 kHz
Output Current 3000 mA
Input Min Voltage 4.5 Volt
Input Max Voltage 42 Volt
Output Min 1.285 Volt
Frequency Min 200 kHz
Frequency Max 1000 kHz
Efficiency (peak) 92 %
On/Off Pin Yes
Error Flag No
SoftStart No
Sync Pin Yes
Inverting Yes
Flyback No
RegType Switching Regulator
Temperature Min -40 deg C
Temperature Max 125 deg C
Adjustable Output Yes
Adj Switch Frequency Yes
PWM Mode Voltage Mode Control
Topology Buck
Special Features 500 kHz Default Switching Frequency
Step-Down Yes
Multiple Output Capability No
Switching Frequency 500 kHz
Feedback Voltage 1.285 Volt
Regulator Family SIMPLE SWITCHER
Automotive Selection Guide No
PowerWise No
Synchronous Rectification No
View Using Catalog


Typical Performance

click for larger image


  WEBENCH Live Simulation!
LM22670 WEBENCH® Custom
Design/Analyze/Build It/Test It
 
4.50 <=		 V in Lower
V		  
<=		 V in Upper
V		  
<= 42.00
V out 1.28 <= V <= 37.00
I out   A <= 3.00
Ambient Temperature °C <= 100

What are WEBENCH® tools?


Also Recommended
LM226710.5A Version
LM226721A Version
LM22673Features Adjustable Soft-Start And Adjustable Current Limit
LM22676Features Precision Enable Only
LM226775A Version
LM226802A Version

Additional Resources

Design Tools (see below)

Application Notes (see below)


Connection Diagram

*click for larger image


*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM22670 3A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Synchronization or Adjustable Switching Frequency 479 Kbytes 24-Nov-08 View Online
Download
LM22670 3A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Synchronization or Adjustable Switching Frequency (Japanese)
 734 Kbytes   Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.


Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM22670MR-5.0PSOP8NOPB3260RoHS N/A Full productionN/A
 
Buy Now 		1K+$1.99rail
of
95		NSXYTT
L22670
5.0
6 weeksN/A
LM22670MR-ADJPSOP8NOPB3260RoHS N/A Full productionN/A
 
Buy Now 		1K+$1.99rail
of
95		NSXYTT
L22670
ADJ
6 weeksN/A
LM22670MRE-5.0PSOP8NOPB3260RoHS N/A Full productionN/A
Samples
Buy Now 		500+$2.22reel
of
250		NSXYTT
L22670
5.0
6 weeksN/A
LM22670MRE-ADJPSOP8NOPB3260RoHS N/A Full productionN/A
Samples
Buy Now 		500+$2.22reel
of
250		NSXYTT
L22670
ADJ
6 weeksN/A
LM22670MRX-5.0PSOP8NOPB3260RoHS N/A Full productionN/A
 
Buy Now 		1K+$1.99reel
of
2500		NSXYTT
L22670
5.0
6 weeksN/A
LM22670MRX-ADJPSOP8NOPB3260RoHS N/A Full productionN/A
 
Buy Now 		1K+$1.99reel
of
2500		NSXYTT
L22670
ADJ
6 weeksN/A
LM22670EVALEvaluation Board for LM22670 & LM22676, 3A SIMPLE SWITCHER regulators with Adj Vout, Adj Freq or Freq Synch & Precision EnableFull productionN/A
 
Buy Now 		1+$24.001-
8 weeks10
LM22670INVEVALEvaluation Board for LM22670INV, Inverting Adjustable Output Voltage Set to -5V Evaluation Board Features: Adjustable Frequency or Frequency Synchronization up to 1MHz, and Precision EnableFull productionN/A
 
Buy Now 		1+$29.001-
8 weeks10
LM22670TJE-5.0TO-263 THIN7NOPB1260RoHS N/A Full productionN/A
Samples
Buy Now 		500+$2.22reel
of
250		NSUZXYTTE#
LM22670
TJ-5.0
6 weeksN/A
LM22670TJE-ADJTO-263 THIN7NOPB1260RoHS N/A Full productionN/A
Samples
Buy Now 		500+$2.22reel
of
250		NSUZXYTTE#
LM22670
TJ-ADJ
8 weeksN/A
LM22670TJ-5.0TO-263 THIN7NOPB1260RoHS N/A Full productionN/A
 
Buy Now 		1K+$1.99reel
of
1000		NSUZXYTTE#
LM22670
TJ-5.0
8 weeksN/A
LM22670TJ-ADJTO-263 THIN7NOPB1260RoHS N/A Full productionN/A
 
Buy Now 		1K+$1.99reel
of
1000		NSUZXYTTE#
LM22670
TJ-ADJ
8 weeksN/A

General Description

The LM22670 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 N-channel MOSFET. The series consists of a fixed 5V output and an adjustable version.

The SIMPLE SWITCHER ® concept provides for an easy to use complete design using a minimum number of external components and National’s WEBENCH ® design tool. National’s WEBENCH ® tool includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards for easy design-in. The switching clock frequency is provided by an internal fixed frequency oscillator which operates at 500 kHz. The switching frequency can also be adjusted with an external resistor or synchronized to an external clock up to 1MHz. It is also possible to self-synchronize multiple regulators to share the same switching frequency. The LM22670 series also has built in thermal shutdown, current limiting and an enable control input that can power down the regulator to a low 25 µA quiescent current standby condition.

Design Tools

TitleSize in Kbytes Date Click link below to Download    
Downloadable LM2267x Quick Start Simple Switcher Component Calculator 1354 Kbytes 13-Nov-2008 View    

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1885: Application Note 1885 LM22670 Evaluation Board 499 Kbytes 14-Oct-08 Download
AN-1888: Application Note 1888 LM22670 Evaluation Board Inverting Topology and Application Notes 472 Kbytes 14-Oct-08 Download
AN-1889: Application Note 1889 How to Measure the Loop Transfer Function of Power Supplies 612 Kbytes 14-Oct-08 Download

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More Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1895: Application Note 1895 LM22671 Evaluation Board 249 Kbytes 14-Oct-08 Download
AN-1896: Application Note 1896 LM22672 Evaluation Board 258 Kbytes 14-Oct-08 Download
AN-1891: Application Note 1891 LM22679 Evaluation Board 232 Kbytes 14-Oct-08 Download
AN-1894: Application Note 1894 LM22673 Evaluation Board 255 Kbytes 14-Oct-08 Download
AN-1892: Application Note 1892 LM22677 Evaluation Board 237 Kbytes 14-Oct-08 Download
AN-1892 (Japanese): Application Note 1892 LM22677 Evaluation Board
 287 Kbytes   Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 7-Jan-2009]