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

Parameters Values

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!

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

LM2621▲	2.85A Switch, Constant Duty Cycle Converter
LM2623▲	2.2A (A Grade) Versatile Low Cost Converter. 0.8V Minimum Input
LM5000▲	2A 80V Integrated Switch With Wider Input Voltage Range (3.1V To 40V)
LM2700	3.6A 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 Kbytes	Date
LM2698 SIMPLE SWITCHER® 1.35A Boost Regulator	941 Kbytes	25-Mar-05	Download

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Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Weeks

Qty

$US each

LM2698EVAL

SIMPLE SWITCHER® 1.35A Boost Regulator

Full production

N/A

$62.50

8 weeks

N/A

LM2698MM-ADJ

MINI SOIC

NOPB

260

RoHS

Download

Full production

N/A

1K+

$1.83

reel
of
1000

ZXTT
S22B

6 weeks

2000

LM2698MMX-ADJ

MINI SOIC

NOPB

260

RoHS

Download

Full production

N/A

1K+

$1.83

reel
of
3500

ZXTT
S22B

6 weeks

N/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-ADJ	ABCD150	0	34175	0	0	4234000	1	1201409060
LM2698MMX-ADJ	ABCD150	0	34175	0	0	4234000	1	1201409060

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

Title	Size in Kbytes	Date
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

Title	Size in Kbytes	Date
AN-1202: Application Note 1202 LM2698 Demoboard	217 Kbytes	10-May-04	Download

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More Application Notes

Title	Size in Kbytes	Date
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]