LM22680 - 2A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Features

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

Features


•Wide input voltage range: 4.5V to 42V
•Internally compensated voltage mode control
•Stable with low ESR ceramic capacitors
•200 mΩ N-channel MOSFET
•Output voltage option:
• -ADJ (outputs as low as 1.285V)
•±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
•Adjustable soft-start
•Fully WEBENCH ® enabled
•Step-down and inverting buck-boost applications

General Description

The LM22680 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 2A 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 2000 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 2000 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) 89 %
On/Off Pin Yes
Error Flag No
SoftStart Yes
Sync Pin 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
Step-Down Yes
Multiple Output Capability No
Switching Frequency 500 kHz
Feedback Voltage 1.285 Volt
Regulator Family SIMPLE SWITCHER
AEC Q-100 Automotive Grade 0
PowerWise No
Synchronous Rectification No
Quiescent Current 3.4 mA
View Using Catalog


Typical Performance

click for larger image


  WEBENCH Live Simulation!
WEBENCH® Designer

LM22680
 
4.50 <=		 V in Lower
 V		  
<=		 V in Upper
 V		  
<= 42.00
V out 1.28 <=  V <= 37.00
I out    A <= 2.00
Ambient Temperature  °C <= 100


What are WEBENCH® tools?


Also Recommended
LM226703A, Features Adjustable Switching Frequency Or Frequency Sync Up To 1MHz And Precision Enable
LM226710.5A Version
LM226721A Version
LM226733A, Features Adjustable Soft-Start And Adjustable Current Limit
LM22674Features Precision Enable Only
LM226775A, Features Adjustable Switching Frequency Or Frequency Sync Up To 1MHz And Precision Enable
LM226795A, Features Adjustable Soft-Start And Adjustable Current Limit

Additional Resources

Online Seminars Design Tools (see below)


Connection Diagram

click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM22680 2A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Features 568 Kbytes 12-Dec-08 Download
LM22680 2A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Features (Japanese)
 668 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
LM22680MR-ADJPSOP8NOPB3260RoHS N/A Full productionN/A
 
Buy Now 		1K+$1.85rail
of
95		NSXYTT
L22680
-ADJ
6 weeksN/A
LM22680MRE-ADJPSOP8NOPB3260RoHS N/A Full productionN/A
Samples
Buy Now 		1K+$1.85reel
of
250		NSXYTT
L22680
-ADJ
6 weeksN/A
LM22680MRX-ADJPSOP8NOPB3260RoHS N/A Full productionN/A
 
Buy Now 		1K+$1.85reel
of
2500		NSXYTT
L22680
-ADJ
6 weeksN/A
LM22680EVALLM22680 - 2A SIMPLE SWITCHER ®, Step-Down Voltage RegulatorFull productionN/A
 
Buy Now 		1+$24.001-
N/AN/A

General Description

The LM22680 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 2A 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 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 LM22680 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. An adjustable soft-start feature is provided by selecting an appropriate external soft-start capacitor.

Design Tools

TitleSize in Kbytes Date Click link below to Download    
Downloadable LM2267x, LM22680 Quick Start Simple Switcher Component Calculator 1413 Kbytes 12-Jan-2009 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-1911: Application Note 1911 LM22680 Evaluation Board 407 Kbytes 12-Dec-08 Download
AN-1930: Application Note 1930 SIMPLE SWITCHER® Regulators Take Over Automotive Applications 85 Kbytes 7-Jan-09 Download

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

[Information as of 5-Jul-2009]