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 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 A Grade B Current Limit 1.2A 0.9A RDS(ON) 0.5 0.7 Applications • MR Head Bias • Digital camera CCD bias • LCD bias • GaAs FET bias • Positive to negative conversion

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

Title		Size	Date	Other Language
	LM2611 1.4MHz Cuk Converter	836 Kbytes	14-Jan-05

Featured Application Notes

Title		Size	Date	Other Language
	AN-1203: Application Note 1203 LM2611 Demoboard	120 Kbytes	10-May-04

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM2611AMF/NOPB LM2611AMF RoHS Status	SOT-23	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1000 AVNET-EM Worldwide 1000 DIGIKEY Worldwide 10793 FUTURE Worldwide 1100 NEWARK Americas 651 RS COMPONENTS Worldwide 95	$1.16 each at 1K+ pcs	reel of 1000
LM2611AMFX/NOPB LM2611AMFX RoHS Status	SOT-23	Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$1.16 each at 1K+ pcs	reel of 3000
LM2611BMF/NOPB LM2611BMF RoHS Status	SOT-23	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 3000 AVNET-EM Worldwide 1000 DIGIKEY Worldwide 3951 FUTURE Worldwide 1100 RS COMPONENTS Worldwide 114	$1.09 each at 1K+ pcs	reel of 1000
LM2611BMFX/NOPB LM2611BMFX RoHS Status	SOT-23	Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$1.09 each at 1K+ pcs	reel of 3000

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

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

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

Part Number(s) (NSID)	Top View	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM2611AMF/NOPB LM2611AMF		SOT-23	5	1 1	260 260	Detail	Download	N/A	S40A XTT
LM2611AMFX/NOPB LM2611AMFX		SOT-23	5	1 1	260 260	Detail	Download	N/A	S40A XTT
LM2611BMF/NOPB LM2611BMF		SOT-23	5	1 1	260 260	Detail	Download	N/A	S40B XTT
LM2611BMFX/NOPB LM2611BMFX		SOT-23	5	1 1	260 260	Detail	Download	N/A	S40B XTT

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

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

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

CAD Symbols and Models Download LM2611 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2611AMF	ABCD150	0	34175	0	0	4234000	1	1201409060
LM2611AMFX	ABCD150	0	34175	0	0	4234000	1	1201409060
LM2611BMF	ABCD150	0	34175	0	0	4234000	1	1201409060
LM2611BMFX	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.

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

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

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