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 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. 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

WEBENCH® LM2698     Min   Max   Range     VIN – V    2.20 – 12.00V     VOUT V    2.20 – 17.00V     IOUT A    ≤ 1.35A     Ambient Temp °C    ≤ 100°C   Footprint BOM Cost Efficiency 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

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance click for larger image

Parameters / Values	LM2698	LM2621	LM2623	LM5000
Output Range	2.2V to 17V	1.24V to 14V	1.24V to 14V	1.259V min.
Switch Current	1.35 Amp	2.85 Amp	1.2, 2.2 Amp	2 Amp
Input Min Voltage	2.2 Volt	1.2 Volt	0.8 Volt	3.1 Volt
Input Max Voltage	12 Volt	14 Volt	14 Volt	40 Volt
Frequency Max	1250 kHz	2000 kHz	2000 kHz	1300 kHz
Output Min	2.2 Volt	1.24 Volt	1.24 Volt	1.259 Volt
Output Max	17 Volt	14 Volt	14 Volt	Undefined Volt
Efficiency (peak)	Undefined %	90 %	90 %	90 %
Sync Pin	No	No	No	No
Adj Switch Frequency	Yes	Yes	Yes	Yes
Frequency Min	600 kHz	300 kHz	300 kHz	300 kHz
On/Off Pin	Yes	Yes	Yes	Yes
PowerGood / Error Flag	No	No	No	No
SoftStart	No	No	No	Yes
Special Features	2.5% output voltage accuracy	Constant duty cycle gated oscillator	Ratio-adaptive gated oscillator	80V internal switch, selectable frequency
PWM Mode	Current	Gated Oscillator	Gated oscillator	current
Topology	Boost	Boost, Flyback	Boost, Flyback	Flyback, Boost, Forward, SEPIC
Step-Up	Yes	Yes	Yes	Yes
Inverting	No	No	No	No
Flyback	No	Yes	Yes	Yes
RegType	Switching Regulator	Switching Regulator	Switching Regulator	Switching Regulator
Adjustable Output	Yes	Yes	Yes	Yes
Output Power	Undefined Watt	Undefined Watt	Undefined Watt	Undefined Watt
Temperature Min	-40 deg C	-40 deg C	-40 deg C	-40 deg C
Temperature Max	125 deg C	85 deg C	85 deg C	125 deg C
Regulator Family	SIMPLE SWITCHER
Quiescent Current	1.3 mA	0.08 mA	0.08 mA	2.1 mA

Datasheets

Title		Size	Date	Other Language
	LM2698 SIMPLE SWITCHER® 1.35A Boost Regulator	941 Kbytes	25-Mar-05

Application Notes

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

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM2698MM-ADJ/NOPB LM2698MM-ADJ RoHS Status	MINI SOIC	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1258 AVNET-EM Worldwide 1000 DIGI-KEY Worldwide 2752 FARNELL Europe and Asia 107 MOUSER Worldwide 937 RS COMPONENTS Worldwide 6 TAYLOR Americas 1258	$1.83 each at 1K+ pcs	reel of 1000
LM2698MMX-ADJ/NOPB LM2698MMX-ADJ RoHS Status	MINI SOIC	Full production Lead Time: 8 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.83 each at 1K+ pcs	reel of 3500

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

Moisture Sensitivity Level Data for LM2698.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM2698 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM2698EVAL	SIMPLE SWITCHER® 1.35A Boost Regulator	Full production	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 2	$62.50 each	1
Description: Simple Switcher® 1.35A Boost Regulator Features: 1.9A, 0.2Ω , internal switch (typical) Operating voltage as low as 2.2V 600kHz/1.25MHz adjustable frequency operation Switchers Made Simple® Software 8-Lead MSOP package Contents: A fully assembled LM2698 evaluation board Application note for LM2698 Datasheet for LM2698 Simple Switcher selection guide

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM2698MM-ADJ/NOPB LM2698MM-ADJ	29.851 30.002	MINI SOIC	8	1 1	260 260	Detail	Download	N/A	ZXTT S22B
LM2698MMX-ADJ/NOPB LM2698MMX-ADJ	29.851 30.002	MINI SOIC	8	1 1	260 260	Detail	Download	N/A	ZXTT S22B

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

Moisture Sensitivity Level Data for LM2698.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM2698 is located at RoHS Status.

Design Tools

Title	Size	Date
Power Reference Design Library

Reference Design

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

CAD Symbols and Models Download LM2698 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2698MM-ADJ	ABCD150	0	42680	0	0	6394000	1	1814314958
LM2698MMX-ADJ	ABCD150	0	42680	0	0	6394000	1	1814314958

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/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM2698.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM2698 is located at RoHS Status.