LM2841 300 mA/600 mA up to 42V Input Step-Down DC/DC Regulator in Thin SOT-23

Part Number(s) (NSID)	Top View	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM2841XMK-ADJL/NOPB		TSOT	6	1	260	Detail	Download	N/A	STFB XTT
LM2841XMKX-ADJL/NOPB		TSOT	6	1	260	Detail	Download	N/A	STFB XTT
LM2841YMK-ADJL/NOPB		TSOT	6	1	260	Detail	Download	N/A	STTB XTT
LM2841YMKX-ADJL/NOPB		TSOT	6	1	260	Detail	Download	N/A	STTB XTT

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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 R_DSON (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, V_IN under-voltage lockout, and gate drive under-voltage lockout. The LM2841 and LM2842 are available in a low profile TSOT-6L package.

Applications

Dirgrams

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