LM2840 Datasheet | National Semiconductor

Description The LM2840, 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 k Hz (X version) and 1.25 MHz (Y version) allowing the use of small external ponents 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 LM2840 is optimized for up to 100 m A, the LM2841 for 300 m A and the LM2842 is optimized for up to 600 m A load currents. They all have a 0.765V nominal feedback voltage. Additional features include: thermal shutdown, VIN under-voltage lockout, and gate drive under-voltage lockout. The LM2840, LM2841 and LM2842 are available in a low profile TSOT-6L package. Features - LM2840Q, LM2841Q and LM2842Q are Automotive Grade products that are AEC-Q100 grade 1 qualified (-40° C to +125°C operating junction temperature) - Input voltage range of 4.5V to 42V - Output current options of 100 m A, 300 m A and 600 m A - Feedback pin voltage of 0.765V - 550 k Hz (X) or 1.25 MHz (Y) switching frequency - Low shutdown IQ, 16 µA typical - Short circuit protected - Internally pensated - Soft-start circuitry - Small overall solution size (TSOT-6L package) Applications - Battery powered equipment - Industrial distributed power applications - Portable media players - Portable hand held instruments Typical Application Circuit © 2011 National Semiconductor Corporation 300367 .national. LM2840/LM2841/LM2842/LM2840Q/LM2841Q/LM2842Q Connection Diagram Top View TSOT 6 Lead NS Package Number MK06A Ordering Information Order Number LM2840XMK-ADJL LM2840XMKX-ADJL LM2840YMK-ADJL LM2840YMKX-ADJL LM2841XMK-ADJL LM2841XMKX-ADJL...