Features • Input voltage range of 3-20V • Dual 2A output • Output voltage down to 0.6V • Internal compensation • 500kHz PWM frequency • Separate enable pins • Separate soft start pins • Frequency foldback protection • 175mΩ NMOS switch • Integrated bootstrap diodes • Over-current protection • ETSSOP and LLP packages • Thermal shutdown Description The LM26400Y is a monolithic, two-output fixed frequency PWM step-down DC/DC regulator in a 16-pin LLP or thermally enhanced ETSSOP package. With a minimum number of external components and internal loop compensation, the LM26400Y is easy to use. The ability to drive 2A loads with an internal 175mΩ NMOS switch using state-of-the-art 0.5µm BiCMOS technology results in a high-power density design. The world class control circuitry allows for an ON-time as low as 40 ns, thus supporting high-frequency conversion over the entire input range of 3V to 20V and down to an output voltage of only 0.6V. The LM26400Y utilizes peak current-mode control and internal compensation to provide high-performance regulation over a wide range of line and load conditions. Switching frequency is internally set to 500kHz, optimal for a broad range of applications in terms of size versus thermal tradeoffs. Given a non-synchronous architecture, efficiencies above 90% are easy to achieve. External shutdown is included, enabling separate turn-on and turn-off of the two channels. Additional features include programmable soft-start circuitry to reduce inrush current, pulse-by-pulse current limit and frequency foldback, integrated bootstrap structure and thermal shutdown. Applications • DTV-LCD • Set-Top Box • XDSL • Automotive • Computing Peripherals • Industrial Controls • Point of Load

Also Recommended LM26420 5Vin, Dual 2A Synchronous Buck With Power Good And Enable For Each Channel LP3906▲ Two 1.5A Switching Outputs Plus Two LDO Outputs MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

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

Datasheets

Title		Size	Date	Other Language
	LM26400Y Dual 2A, 500kHz Wide Input Range Buck Regulator	2456 Kbytes	24-Aug-07	日本語

Featured Application Notes

Title		Size	Date	Other Language
	AN-1600: Application Note 1600 LM26400Y Demonstration Board	191 Kbytes	9-Mar-07	中文

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM26400YMH/NOPB RoHS Status	TSSOP EXP PAD	Full production Lead Time: 18 weeks	Distributor Region Qty AVNET-EM Worldwide 163 DIGIKEY Worldwide 0 FARNELL Europe and Asia 218 FUTURE Worldwide 152 NEWARK Americas 250	$2.25 each at 1K+ pcs	rail of 92
LM26400YMHX/NOPB RoHS Status	TSSOP EXP PAD	Full production Lead Time: 18 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$2.25 each at 1K+ pcs	reel of 2500
LM26400YSD/NOPB LM26400YSD RoHS Status	LLP	Full production Lead Time: 18 weeks	Distributor Region Qty AVNET-EM Worldwide 1000 DIGIKEY Worldwide 768 FARNELL Europe and Asia 868	$2.25 each at 1K+ pcs	reel of 1000
LM26400YSDE/NOPB RoHS Status	LLP	Full production Lead Time: 18 weeks	Distributor Region Qty DIGIKEY Worldwide 0 RS COMPONENTS Worldwide 73	$2.25 each at 1K+ pcs	reel of 250
LM26400YSDX/NOPB LM26400YSDX RoHS Status	LLP	Full production Lead Time: 18 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$2.25 each at 1K+ pcs	reel of 4500

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
LM26400YMH/NOPB		TSSOP EXP PAD	16	1	260	Detail	Download	N/A	NSUZXYTT L26400 YMH
LM26400YMHX/NOPB		TSSOP EXP PAD	16	1	260	Detail	Download	N/A	NSUZXYTT L26400 YMH
LM26400YSD/NOPB LM26400YSD		LLP	16	1 3	260 260	Detail	Download	N/A	NS UZXYTT L26400Y
LM26400YSDE/NOPB		LLP	16	1	260	Detail	Download	N/A	NS UZXYTT L26400Y
LM26400YSDX/NOPB LM26400YSDX		LLP	16	1 1	260 260	Detail	Download	N/A	NS UZXYTT L26400Y

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
Article - Reducing Buck Converter Input Capacitance through Multi-Phasing and Clock Synchronization

CAD Symbols and Models Download LM26400Y CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM26400YMH	PVIP050	0	9960	0	0	855000	5	242608584
LM26400YMHX	PVIP050	0	9960	0	0	855000	5	242608584
LM26400YSD	PVIP050	0	9960	0	0	855000	5	242608584
LM26400YSDE	PVIP050	0	9960	0	0	855000	5	242608584
LM26400YSDX	PVIP050	0	9960	0	0	855000	5	242608584

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.