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

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

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.

Applications
•Industrial Control
•Telecom and Datacom Systems
•Embedded Systems
•Automotive Telematics and Body Electronics
•Conversions from Standard 24V, 12V and 5V Input Rails
WEBENCH Power Designer My Designs

LM22670
 
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
LM22671▲0.5A Version
LM22672▲1A Version
LM22673▲Features Adjustable Soft-Start And Adjustable Current Limit
LM22676▲Features Precision Enable Only
LM22677▲5A Version
LM22680▲2A Version



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                                              LM22670
Drag-Select for Table Reset Graph
Also Recommended
LM22671▲0.5A Version
LM22672▲1A Version
LM22673▲Features Adjustable Soft-Start And Adjustable Current Limit
LM22676▲Features Precision Enable Only
LM22677▲5A Version
LM22680▲2A Version
Paramaters / ValuesLM22670 LM22671 LM22672 LM22673 LM22676 LM22677 LM22680
Output Current3000 mA 500 mA 1000 mA 3000 mA 3000 mA 5000 mA 2000 mA
Input Min Voltage4.5 Volt 4.5 Volt 4.5 Volt 4.5 Volt 4.5 Volt 4.5 Volt 4.5 Volt
Input Max Voltage42 Volt 42 Volt 42 Volt 42 Volt 42 Volt 42 Volt 42 Volt
Output Min1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt
Frequency Min200 kHz 200 kHz 200 kHz 200 kHz 200 kHz
Frequency Max1000 kHz 1000 kHz 1000 kHz 1000 kHz 1000 kHz
Efficiency (peak)92 % 91 % 92 % 92 % 92 % 92 % 89 %
On/Off PinYes Yes Yes No Yes Yes Yes
Error FlagNo No No No No No No
SoftStartNo Yes Yes Yes No No Yes
Sync PinYes Yes Yes No No Yes Yes
InvertingYes Yes Yes Yes Yes Yes
FlybackNo No No No No No No
RegTypeSwitching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator Switching Regulator
Temperature Min-40 deg C -40 deg C -40 deg C -40 deg C -40 deg C -40 deg C -40 deg C
Temperature Max125 deg C 125 deg C 125 deg C 125 deg C 125 deg C 125 deg C 125 deg C
Adjustable OutputYes Yes Yes Yes Yes Yes Yes
Adj Switch FrequencyYes Yes Yes No No Yes Yes
PWM ModeVoltage Mode Control Voltage Mode Control Voltage Mode Control Voltage Mode Control Voltage Mode Control Voltage Mode Control Voltage Mode Control
TopologyBuck Buck Buck Buck Buck Buck Buck
Special Features500 kHz Default Switching Frequency 500 kHz Default Switching Fequency 500 kHz Default Switching Frequency Adjustable Current Limit 500 kHz Switching Frequency 500 kHz Default Switching Frequency
Step-DownYes Yes Yes Yes Yes Yes Yes
Multiple Output CapabilityNo No No No No No No
Switching Frequency500 kHz 500 kHz 500 kHz 500 kHz 500 kHz 500 kHz 500 kHz
Feedback Voltage1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt 1.285 Volt
Regulator FamilySIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER SIMPLE SWITCHER
AutomotiveNo No No No No No
PowerWiseNo No No No No No No
Synchronous RectificationNo No No No No No No
Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM22670MR-5.0/NOPB

RoHS Status



PSOP		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
ARROWWorldwide550
AVNET-EMWorldwide40
DIGIKEYWorldwide0
FUTUREWorldwide190
$1.98 each at 1K+ pcsrail
of
95
LM22670MR-ADJ/NOPB

RoHS Status



PSOP		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
ARROWWorldwide200
DIGIKEYWorldwide399
FUTUREWorldwide190
$1.98 each at 1K+ pcsrail
of
95
LM22670MRE-5.0/NOPB

RoHS Status



PSOP		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide3250
DIGIKEYWorldwide1654
FUTUREWorldwide635
NEWARKAmericas83
$1.98 each at 1K+ pcsreel
of
250
LM22670MRE-ADJ/NOPB

RoHS Status



PSOP		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide1383
FUTUREWorldwide250
NEWARKAmericas632
$1.98 each at 1K+ pcsreel
of
250
LM22670MRX-5.0/NOPB

RoHS Status



PSOP		Full production
Lead Time: 8 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.98 each at 1K+ pcsreel
of
2500
LM22670MRX-ADJ/NOPB

RoHS Status



PSOP		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
ARROWWorldwide2500
DIGIKEYWorldwide0
$1.98 each at 1K+ pcsreel
of
2500
LM22670TJ-5.0/NOPB

RoHS Status



TO-263 THIN		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
ARROWWorldwide1000
DIGIKEYWorldwide0
$1.98 each at 1K+ pcsreel
of
1000
LM22670TJ-ADJ/NOPB

RoHS Status



TO-263 THIN		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
ARROWWorldwide1000
DIGIKEYWorldwide0
$1.98 each at 1K+ pcsreel
of
1000
LM22670TJE-5.0/NOPB

RoHS Status



TO-263 THIN		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide250
DIGIKEYWorldwide446
FUTUREWorldwide495
NEWARKAmericas350
$1.98 each at 1K+ pcsreel
of
250
LM22670TJE-ADJ/NOPB

RoHS Status



TO-263 THIN		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
ARROWWorldwide2000
DIGIKEYWorldwide437
FUTUREWorldwide500
$1.98 each at 1K+ pcsreel
of
250

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM22670EVAL
Evaluation Board for LM22670 & LM22676, 3A SIMPLE SWITCHER regulators with Adj Vout, Adj Freq or Freq Synch & Precision EnableFull production
Lead Free (RoHS)

 
DistributorRegionQty
AVNET-EMWorldwide1
DIGIKEYWorldwide19
FUTUREWorldwide2
NATIONALWorldwide45
$24.00 each1

Description:

The LM22670 evaluation board is designed to demonstrate the capabilities of the LM22670 switching regulator. The LM22670 evaluation board is configured to provide an output voltage of 3.3V up to 3A load current with an input voltage range of 4.5V to 42V. Due to the low RDS(ON) of the integrated N-channel MOSFET and maximum duty -cycle limitations, the minimum input voltage of 4.5V will only provide a 3.3V output voltage for load currents up to 500 mA. For load currents higher than 500 mA, an input voltage of 5.5V or higher is required. The typical operating frequency is 500 kHz. The evaluation board is designed to operate at ambient temperatures up to 50°C.

At low input voltages between 4.5V and 6V, a minimum load of approximately 5 mA may be required to reach a regulated 3.3V output voltage. To aid in the design and evaluation of DC/DC buck converter solutions based on the LM22670 switching regulator, the evaluation board can be re-configured for different output voltages.

Contents:

  • LM22670 Assembled Evaluation Board
  • Application Note 1885 for the LM22670 Evaluation Board
  • LM22670 Datasheet

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM22670INVEVAL
Evaluation Board for LM22670INV, Inverting Adjustable Output Voltage Set to -5V Evaluation Board Features: Adjustable Frequency or Frequency Synchronization up to 1MHz, and Precision EnableFull production


 
DistributorRegionQty
ARROWWorldwide10
AVNET-EMWorldwide4
DIGIKEYWorldwide28
NATIONALWorldwide75
$29.00 each1

Description:

The LM22670 inverting evaluation board is designed to demonstrate the capabilities of the LM22670 switching regulator in a polarity inverting topology. The LM22670 inverting evaluation board is configured to provide an output of minus 5V (-5V) up to 1.5A load current with an input voltage range of 5V to 35V. The typical operating frequency if 500 kHz. evaluation board is configured to provide an output voltage of 3.3V up to 500 mA load current with an input voltage range of 4.5V to 42V. The typical operating frequency is 500 kHz.

The evaluation board is designed to operate at ambient temperatures up to 50 °C. To aid in the design and evaluation of DC/DC polarity-inverting converter solutions based on the LM22670 switching

Features:

  • Input Range: 5.5V to 35V, 12V nominal
  • Output Voltage: -5V
  • Output Current Range: 0A to 1.5A
  • Frequency of Operation: 500 kHz
  • Board Size: 1.5 X 1.5 inches
  • Package: PSOP-8

Contents:


Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHS
Status		CAD SymbolsModelsPackage
Marking
Format
LM22670MR-5.0/NOPB
PSOP83260DetailDownloadN/A
NSXYTT
L22670
5.0
LM22670MR-ADJ/NOPB
PSOP83260DetailDownloadN/A
NSXYTT
L22670
ADJ
LM22670MRE-5.0/NOPB
PSOP83260DetailDownloadN/A
NSXYTT
L22670
5.0
LM22670MRE-ADJ/NOPB
PSOP83260DetailDownloadN/A
NSXYTT
L22670
ADJ
LM22670MRX-5.0/NOPB
PSOP83260DetailDownloadN/A
NSXYTT
L22670
5.0
LM22670MRX-ADJ/NOPB
PSOP83260DetailDownloadN/A
NSXYTT
L22670
ADJ
LM22670TJ-5.0/NOPB
TO-263 THIN71260DetailDownloadN/A
NSUZXYTTE#
LM22670
TJ-5.0
LM22670TJ-ADJ/NOPB
TO-263 THIN71260DetailDownloadN/A
NSUZXYTTE#
LM22670
TJ-ADJ
LM22670TJE-5.0/NOPB
TO-263 THIN71260DetailDownloadN/A
NSUZXYTTE#
LM22670
TJ-5.0
LM22670TJE-ADJ/NOPB
TO-263 THIN71260DetailDownloadN/A
NSUZXYTTE#
LM22670
TJ-ADJ

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Design Tools
TitleSizeDate
"Downloadable LM2267x, LM22680 Quick Start Simple Switcher Component Calculator"1413 Kbytes12-Jan-2009

CAD Symbols and Models
Download LM22670 CAD Symbols
 Models
N/A

WEBENCH Power Designer My Designs

LM22670
 
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?

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM22670MR-5.0ABCD5053640016269843461661152
LM22670MR-ADJABCD5053640016269843461661152
LM22670MRE-5.0ABCD5053640016269843461661152
LM22670MRE-ADJABCD5053640016269843461661152
LM22670MRX-5.0ABCD5053640016269843461661152
LM22670MRX-ADJABCD5053640016269843461661152
LM22670TJ-5.0ABCD5053640016269843461661152
LM22670TJ-ADJABCD5053640016269843461661152
LM22670TJE-5.0ABCD5053640016269843461661152
LM22670TJE-ADJABCD5053640016269843461661152

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

LM315x/LM2267x Simple Switcher Controllers/Regulators & WEBENCH Power Designer
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LM315x/LM2267x Simple Switcher Controllers/Regulators & WEBENCH Power Designer
Date: 10/31/2008
Length: 0:6:33
[Information as of 9-Feb-2010]