Features • Input voltage range of 4.5V to 42V • Output current options of 300 mA and 600 mA • Feedback pin voltage of 0.765V • 550 kHz (X) or 1.25 Mhz (Y) switching frequency • Low shutdown IQ, 16 µA typical • Short circuit protected • Internally compensated • Soft-start circuitry • Small overall solution size (TSOT-6L package) Description The LM2841 and LM2842 are PWM DC/DC buck (step-down) regulators. With a wide input range from 4.5V-42V, they are suitable for a wide range of applications such as power conditioning from unregulated sources. They feature a low RDSON (0.9Ω typical) internal switch for maximum efficiency (85% typical). Operating frequency is fixed at 550 kHz (X version) and 1.25 MHz (Y version) allowing the use of small external components while still being able to have low output voltage ripple. Soft-start can be implemented using the shutdown pin with an external RC circuit allowing the user to tailor the soft-start time to a specific application. The LM2842 is optimized for up to 600 mA load currents while the LM2841 is optimized for up to 300 mA load current. Both have a 0.765V nominal feedback voltage. Additional features include: thermal shutdown, VIN under-voltage lockout, and gate drive under-voltage lockout. The LM2841 and LM2842 are available in a low profile TSOT-6L package. Applications • Battery powered equipment • Industrial distributed power applications • Portable media players • Portable hand held instruments

LM2841X   4.50 <= V in Lower  V   <= V in Upper  V   <= 42.00 V out 0.80 <=  V <= 40.00 I out    A <= 0.30 Ambient Temperature  °C <= 100 What are WEBENCH® tools? front page schematic, no component values MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application click for larger image front page schematic, no component values	Block Diagram click for larger image Block diagram
Typical Performance click for larger image

Datasheet

Title		Size	Date	Other Language
	LM2841 LM2842 300 mA/600 mA up to 42V Input Step-Down DC/DC Regulator in Thin SOT-23	314 Kbytes	2-Sep-09

Featured Application Notes

Title		Size	Date	Other Language
	AN-1876: Application Note 1876 LM2841 Evaluation Board	385 Kbytes	2-Sep-09
	AN-1982: Application Note 1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool	63 Kbytes	15-Jul-09

More Application Notes

Title		Size	Date	Other Language
	AN-1908: Application Note 1908 LM2842 Evaluation Board	427 Kbytes	2-Sep-09

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM2841XMK-ADJL/NOPB RoHS	TSOT	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 1000 DIGIKEY Worldwide 1828 FUTURE Worldwide 1100 NEWARK Americas 793	$1.36 each at 1K+ pcs	reel of 1000
LM2841YMK-ADJL/NOPB RoHS	TSOT	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 1000 DIGIKEY Worldwide 2168 FUTURE Worldwide 1100 NEWARK Americas 970	$1.41 each at 1K+ pcs	reel of 1000
LM2841XMKX-ADJL/NOPB RoHS	TSOT	Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$1.36 each at 1K+ pcs	reel of 3000
LM2841YMKX-ADJL/NOPB RoHS	TSOT	Full production Lead Time: 6 weeks	Distributor Region Qty DIGIKEY Worldwide 0	$1.41 each at 1K+ pcs	reel of 3000

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM2841FMK-ADJL	LM2841XMK-ADJL	NATIONAL SEMICONDUCTOR	30 Oct 2009

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2841XMK-ADJL	ABCD5	0	5364	0	0	1626984	3	461661152
LM2841XMKX-ADJL	ABCD5	0	5364	0	0	1626984	3	461661152
LM2841YMK-ADJL	ABCD5	0	5364	0	0	1626984	3	461661152
LM2841YMKX-ADJL	ABCD5	0	5364	0	0	1626984	3	461661152

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.

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Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM2841FMK-ADJL	LM2841XMK-ADJL	NATIONAL SEMICONDUCTOR	30 Oct 2009