Features • Small Mini-SO8 Package (Half the Footprint of Standard 8-Pin SO Package) • 1.09 mm Package Height • Up to 2 MHz Switching Frequency • 1.2V to 14V Input Voltage • 1.24V - 14V Adjustable Output Voltage • Up to 1A Load Current • 0.17 Internal MOSFET • Up to 90% Regulator Efficiency • 80 µA Typical Operating Current • <2.5µA Guaranteed Supply Current In Shutdown Description The LM2621 is a high efficiency, step-up DC-DC switching regulator for battery-powered and low input voltage systems. It accepts an input voltage between 1.2V and 14V and converts it into a regulated output voltage. The output voltage can be adjusted between 1.24V and 14V. It has an internal 0.17 N-Channel MOSFET power switch. Efficiencies up to 90% are achievable using the LM2621. The high switching frequency (adjustable up to 2MHz) of the LM2621 allows for tiny surface mount inductors and capacitors. Because of the unique constant-duty-cycle gated oscillator topology very high efficiencies are realized over a wide load range. The supply current is reduced to 80µA because of the BiCMOS process technology. In the shutdown mode, the supply current is less than 2.5µA. The LM2621 is available in a Mini-SO-8 package. This package uses half the board area of a standard 8-pin SO and has a height of just 1.09 mm. Applications • PDAs, Cellular Phones • 2-Cell and 3-Cell Battery-Operated Equipment • PCMCIA Cards, Memory Cards • Flash Memory Programming • TFT/LCD Applications • 3.3V to 5.0V Conversion • GPS Devices • Two-Way Pagers • Palmtop Computers • Hand-Held Instruments

LM2621   1.20 <= V in Lower  V   <= V in Upper  V   <= 14.00 V out 1.24 <=  V <= 14.00 I out    A <= 2.85 Ambient Temperature  °C <= 100 What are WEBENCH® tools? Also Recommended LM2623▲ Operates With Input Voltages As Low As 0.8V LM2698▲ Wider Switch Voltage , Fixed Frequency LM27313▲ Fixed Frequency , Smaller Package LM2733▲ 1A 40V Switch Boost Regulator In SOT-23 LM3224▲ Wider Switch Voltage , Fixed Frequency LM2704 Low Power 500mA Switch Boost In SOT-23 MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

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

Datasheets

Title		Size	Date	Other Language
	LM2621 Low Input Voltage, Step-Up DC-DC Converter	656 Kbytes	25-Mar-05	日本語

More Application Notes

Title		Size	Date	Other Language
	AN-1274: Application Note 1274 LM2623 Evaluation Board	636 Kbytes	21-Sep-05	中文
	AN-1250: Application Note 1250 Inductive Based Switching Regulator Circuits Provide High Efficiency White LED Drives	81 Kbytes	26-Sep-02
	AN-1237: Application Note 1237 RSDS™ Flat Panel Display Design Guidelines Part 2	141 Kbytes	14-May-03
	AN-1258: Application Note 1258 National`s LM2623 Boost Converter - A Simple Supply	64 Kbytes	2-May-04
	AN-1221: Application Note 1221 LM2623 Cookbook	35 Kbytes	2-May-04	日本語
	AN-1198: Application Note 1198 LM2622 Step-Up DC/DC Converter Evaluation Board	110 Kbytes	3-Apr-07

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM2621MM/NOPB LM2621MM RoHS Status	MINI SOIC	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1000 DIGIKEY Worldwide 3134 FUTURE Worldwide 1100 NEWARK Americas 1011 RS COMPONENTS Worldwide 275	$0.71 each at 1K+ pcs	reel of 1000
LM2621MMX/NOPB LM2621MMX RoHS Status	MINI SOIC	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 3500 DIGIKEY Worldwide 0	$0.71 each at 1K+ pcs	reel of 3500

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
LM2621MM/NOPB LM2621MM		MINI SOIC	8	1 1	260 260	Detail	Download	N/A	ZXTT S06A
LM2621MMX/NOPB LM2621MMX		MINI SOIC	8	1 1	260 260	Detail	Download	N/A	ZXTT S06A

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.

Design Tools

Title	Size	Date
Power Reference Design Library

Reference Design

LM2621 Reference Design - Sepic Converter for Battery Applications: 2.7-5.5V Input, 3.3V @ 0.65A Output

CAD Symbols and Models Download LM2621 CAD Symbols

Models N/A

LM2621   1.20 <= V in Lower  V   <= V in Upper  V   <= 14.00 V out 1.24 <=  V <= 14.00 I out    A <= 2.85 Ambient Temperature  °C <= 100 What are WEBENCH® tools?

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2621MM	ABCD150	0	34175	0	0	4234000	1	1201409060
LM2621MMX	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.