LM2611 - 1.4MHz Cuk Converter
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Knowledge Base

Features
•1.4MHz switching frequency
•Low RDS(ON) DMOS FET
•1mVp-p output ripple
•-5V at 300mA from 5V input
•Better regulation than a charge pump
•Uses tiny capacitors and inductors
•Wide input range: 2.7V to 14V
•Low shutdown current: <1uA
•5-lead SOT-23 package

General Description

The LM2611 is a current mode, PWM inverting switching regulator. More...


Applications

•MR Head Bias
•Digital camera CCD bias
•LCD bias
•GaAs FET bias
•Positive to negative conversion
  Typical Application
click for larger image


ParametersValues
Switch Current 1.2, 0.9 Amp
Output Min -1.23 Volt
Output Range -1.23V to -(36-Vinmax)V
Input Min Voltage 2.7 Volt
Input Max Voltage 14 Volt
Frequency Min 1400 kHz
Frequency Max 1400 kHz
Efficiency (peak) 80 %
Sync Pin No
Adj Switch Frequency No
On/Off Pin Yes
Error Flag No
SoftStart No
PWM Mode CUK
Topology Inverting
Step-Up No
Inverting Yes
Flyback No
RegType Switching Regulator
Adjustable Output Yes
Output Power 2 Watt
Temperature Min -40 deg C
Temperature Max 125 deg C


Typical Performance

click for larger image


  Block Diagram
click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM2611 1.4MHz Cuk Converter 836
Kbytes		 14-Jan-05 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
LM2611EVAL1.4MHz Cuk ConverterFull productionN/A
 
Buy Now 		1+$25.301-
8 weeksN/A
LM2611AMFSOT-235NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.16reel
of
1000		S40A
XTT
6 weeks3000
LM2611BMFSOT-235NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.09reel
of
1000		S40B
XTT
6 weeks3000
LM2611AMFXSOT-235NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.16reel
of
3000		S40A
XTT
6 weeksN/A
LM2611BMFXSOT-235NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.09reel
of
3000		S40B
XTT
6 weeks5000

General Description

The LM2611 is a current mode, PWM inverting switching regulator. Operating from a 2.7 - 14V supply, it is capable of producing a regulated negative output voltage of up to -(36-VIN(MAX)). The LM2611 utilizes an input and output inductor, which enables low voltage ripple and RMS current on both the input and the output. With a switching frequency of 1.4MHz, the inductors and output capacitor can be physically small and low cost. High efficiency is achieved through the use of a low RDS(ON) FET.

The LM2611 features a shutdown pin, which can be activated when the part is not needed to lower the Iq and save battery life. A negative feedback (NFB) pin provides a simple method of setting the output voltage, using just two resistors. Cycle-by-cycle current limiting and internal compensation further simplify the use of the LM2611.

The LM2611 is available is a small SOT23-5 package. It comes in two grades:

 Grade AGrade B
Current Limit1.2A0.9A
RDS(ON)0.50.7

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM2611AMFABCD15003417500423400011201409060
LM2611AMFXABCD15003417500423400011201409060
LM2611BMFABCD15003417500423400011201409060
LM2611BMFXABCD15003417500423400011201409060

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.


Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1203: Application Note 1203 LM2611 Demoboard 120
Kbytes		 10-May-04 Download

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[Information as of 8-Nov-2009]