LM2717-ADJ   
Dual Step-Down DC/DC Converter 		Click link to Download

Features
•Adjustable buck converter with a 2.2A, 0.16Ω, internal switch (Buck 1)
•Adjustable buck converter with a 3.2A, 0.16Ω, internal switch (Buck 2)
•Operating input voltage range of 4V to 20V
•Input undervoltage protection
•300kHz to 600kHz pin adjustable operating frequency
•Over temperature protection
•Small 24-Lead TSSOP package

Description

The LM2717-ADJ is composed of two PWM DC/DC buck (step-down) converters. Both converters are used to generate an adjustable output voltage as low as 1.267V. Both also feature low RDSON (0.16Ω) internal switches for maximum efficiency. Operating frequency can be adjusted anywhere between 300kHz and 600kHz allowing the use of small external components. External soft-start pins for each converter enables the user to tailor the soft-start times to a specific application. Each converter may also be shut down independently with its own shutdown pin. The LM2717-ADJ is available in a low profile 24-lead TSSOP package ensuring a low profile overall solution.

Applications
•TFT-LCD Displays
•Handheld Devices
•Portable Applications
•Laptop Computers
•Automotive Applications
Also Recommended
LM26400Y▲Vin Down To 3V, Vout Down To 0.6V, Dual 2A ADJ Outputs
LM2717▲For A Fixed 3.3V Output Version



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                                              LM2717-ADJ
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Also Recommended
LM26400Y▲Vin Down To 3V, Vout Down To 0.6V, Dual 2A ADJ Outputs
LM2717▲For A Fixed 3.3V Output Version

Typical Application
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Block Diagram
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Typical Performance
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Paramaters / ValuesLM2717-ADJ LM26400Y LM2717
Channels2 Channels 2 Channels 2 Channels
Output Range1.265V-18V 0.6 to 16V 1.265V-18V
Output1 TopologyBuck Buck Buck
Output2 TopologyBuck Buck Buck
Input Min Voltage4 Volt 3 Volt 4 Volt
Input Max Voltage20 Volt 20 Volt 20 Volt
Frequency Min300 kHz 520 kHz 300 kHz
Frequency Max600 kHz 520 kHz 600 kHz
Efficiency (peak)90 % 90 %
Adj Switch FrequencyYes No Yes
Output1 VoutMin1.267 Volt 0.6 Volt 3.3 Volt
Output1 VoutMax18 Volt 16 Volt 3.3 Volt
Output1 IoutMax2200 mA 2000 mA 2200 mA
Output2 VoutMin1.267 Volt 0.6 Volt 1.267 Volt
Output2 VoutMax18 Volt 16 Volt 18 Volt
Output2 IoutMax3600 mA 2000 mA 3200 mA
Sync PinNo No No
MOSFET Rdson0.16ohm 175 mohm 0.16ohm
SoftStartYes Yes Yes
On/Off PinYes Yes Yes
Error FlagNo No No
Special FeaturesSee LM2717 for similar product with 1 fixed output, 1 adjustable output See LM2717-ADJ for similar product with 2 adjustable outputs
TopologyDual Buck peak-current mode Dual Buck
RegTypeSwitching Regulator Switching Regulator Switching Regulator
Step-DownYes Yes Yes
Step-UpNo No No
InvertingNo No No
FlybackNo No No
Switching Frequency600 kHz 520 kHz 600 kHz
Multiple Output CapabilityYes Yes Yes
Temperature Min-40 deg C -40 deg C -40 deg C
Temperature Max125 deg C 125 deg C 125 deg C

Datasheet
TitleSizeDateOther
Language
LM2717-ADJ Dual Step-Down DC/DC Converter397
Kbytes		4-Mar-08 


Featured Application Notes
TitleSizeDateOther
Language
AN-1456: Application Note 1456 LM2717-ADJ Evaluation Board425
Kbytes		10-May-06 


More Application Notes
TitleSizeDateOther
Language
AN-1237: Application Note 1237 RSDS™ Flat Panel Display Design Guidelines Part 2141
Kbytes		14-May-03 
AN-1339: Application Note 1339 LM2716 Evaluation Board274
Kbytes		9-Jul-04 

Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM2717MT-ADJ/NOPB

RoHS



TSSOP		Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide843
FARNELLEurope and Asia168
NEWARKAmericas110
RS COMPONENTSWorldwide18
$2.70 each at 1K+ pcsrail
of
61
LM2717MTX-ADJ/NOPB

RoHS



TSSOP		Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$2.70 each at 1K+ pcsreel
of
2500

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM2717MT-ADJEV
Dual Step-Down DC/DC ConverterFull production


 
DistributorRegionQty
DIGIKEYWorldwide0
FUTUREWorldwide2
NATIONALWorldwide28
$115.00 each1

Description:

The LM2717MT-ADJ is composed of two PWM DC/DC buck (step-down)converters. Both converters are used to generate an adjustable output voltage as low as 1.267V. Both converters are used to generate an adjustable output voltage as low as 1.267V. Both also feature low RDSON (0.16ohm) internal switches for maximum efficiency. Operating frequency can be adjusted anywhere between 300kHz and 600kHz allowing the use of small external components. External soft-start pins for each converter enables the user to tailor the soft-start times to a specific application. Each converter may also be shut down independently with its own shutdown pin. The LM2717-ADJ is available in a low profile 24-lead TSSOP package ensuring a low profile overall solution.

Features:

  • Adjustable buck converter with a 2.2A, 0.16 ohm, internal switch (Buck 1)
  • Adjustable buck converter with a 3.2A, 0.16 ohm, internal switch (Buck 2)
  • Operating input voltage range of 4V to 20V
  • Input undervoltage protection
  • 300kHz to 600kHz pin adjustable operating frequency
  • Over temperature protection
  • Small 24-Lead TSSOP package

Applications:

  • TFT-LCD Displays
  • Handheld Devices
  • Portable Applications
  • Laptop Computers
  • Automotive Applications

Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHSCAD SymbolsModelsPackage
Marking
Format
LM2717MT-ADJ/NOPB
TSSOP241260RoHSN/AN/A
NSUZXYTTE#
LM2717
MT-ADJ
LM2717MTX-ADJ/NOPB
TSSOP241260RoHSN/AN/A
NSUZXYTTE#
LM2717
MT-ADJ

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM2717MT-ADJABCD15003417500423400011201409060
LM2717MTX-ADJABCD15003417500423400011201409060

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.


[Information as of 22-Nov-2009]