LM2698 - SIMPLE SWITCHER® 1.35A Boost Regulator
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Design Tools Reference Designs Application Notes Knowledge Base

Features
1.9A, 0.2, internal switch (typical)
Operating voltage as low as 2.2V
600kHz/1.25MHz adjustable frequency operation
Switchers Made Simple® software
8-Lead MSOP package

General Description


The LM2698 is a general purpose PWM boost converter. More...


Applications


3.3V to 5V, 5V to 12V conversion
Distributed Power
Set-Top Boxes
DSL Modems
Diagnostic Medical Instrumentation
Boost Converters
Flyback Converters
SEPIC Converters
  Typical Application
click for larger image


ParametersValues
Output Range 2.2V to 17V
Switch Current 1.35 Amp
Input Min Voltage 2.2 Volt
Input Max Voltage 12 Volt
Frequency Max 1250 kHz
Output Min 2.2 Volt
Output Max 17 Volt
Sync Pin No
Adj Switch Frequency Yes
Frequency Min 600 kHz
On/Off Pin Yes
Error Flag No
SoftStart No
Special Features 2.5% output voltage accuracy
PWM Mode Current
Topology Boost
Step-Up Yes
Inverting No
Flyback No
RegType Switching Regulator
Adjustable Output Yes
Temperature Min -40 deg C
Temperature Max 125 deg C
Regulator Family SIMPLE SWITCHER


Typical Performance


click for larger image


  WEBENCH Live Simulation!
WEBENCH Power Designer My Designs

LM2698

 
2.20 <=
V in Lower
 V
 
<=
V in Upper
 V
 
<= 12.00
V out 2.20 <=  V <= 17.00
I out    A <= 1.35
Ambient Temperature  °C <= 100


What are WEBENCH® tools?

Also Recommended
LM26212.85A Switch, Constant Duty Cycle Converter
LM26232.2A (A Grade) Versatile Low Cost Converter. 0.8V Minimum Input
LM50002A 80V Integrated Switch With Wider Input Voltage Range (3.1V To 40V)
LM27003.6A Switch High Frequency (600KHz, 1.25MHz) PWM Converter
Additional Resources
Design Tools

Application Notes


Block Diagram


click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM2698 SIMPLE SWITCHER® 1.35A Boost Regulator 941
Kbytes
25-Mar-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
LM2698EVALSIMPLE SWITCHER® 1.35A Boost RegulatorFull productionN/A
 
Buy Now
1+$62.501-
8 weeksN/A
LM2698MM-ADJMINI SOIC8NOPB1260RoHS Download Full productionN/A
Samples
Buy Now
1K+$1.83reel
of
1000
ZXTT
S22B
6 weeks2000
LM2698MMX-ADJMINI SOIC8NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$1.83reel
of
3500
ZXTT
S22B
6 weeksN/A

General Description


The LM2698 is a general purpose PWM boost converter. The 1.9A, 18V, 0.2ohm internal switch enables the LM2698 to provide efficient power conversion to outputs ranging from 2.2V to 17V. It can operate with input voltages as low as 2.2V and as high as 12V. Current-mode architecture provides superior line and load regulation and simple frequency compensation over the device's 2.2V to 12V input voltage range. The LM2698 sets the standard in power density and is capable of supplying 12V at 400mA from a 5V input. The LM2698 can also be used in flyback or SEPIC topologies.

The LM2698 SIMPLE SWITCHER® features a pin selectable switching frequency of either 600kHz or 1.25MHz. This promotes flexibility in component selection and filtering techniques. A shutdown pin is available to suspend the device and decrease the quiescent current to 5µA. An external compensation pin gives the user flexibility in setting frequency compensation, which makes possible the use of small, low ESR ceramic capacitors at the output. Switchers Made Simple® software is available to insure a quick, easy and guaranteed design. The LM2698 is available in a low profile 8-lead MSOP package.

Reliability Metrics


Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM2698MM-ADJABCD15003417500423400011201409060
LM2698MMX-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.


Design Tools


TitleSize in Kbytes Date Click link below to Download    
Power Reference Design Library     View    

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


Reference Designs
LM2698 Reference Design - 8x4 LED array, with PWM dimming
LM2698 Reference Design - Fully Isolated Forward Converter, 36-57V Input, 3.3V @ 2A & 1.8V @ 1A Dual Outputs

Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-1202: Application Note 1202 LM2698 Demoboard 217
Kbytes
10-May-04 Download

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

More Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-1444: Application Note 1444 LM2695 Evaluation Board 716
Kbytes
15-Feb-06 Download
AN-1472: Application Note 1472 LM2694 Evaluation Board 796
Kbytes
16-May-06 Download
AN-1410: Application Note 1410 LM2696 Demonstration Board 566
Kbytes
14-Aug-06 Download
AN-1410 (Chinese): Application Note 1410 LM2696 Demonstration Board
314 Kbytes  

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

[Information as of 7-Nov-2009]