LM284x PWM DC-DC Buck Regulators

Texas Instruments' 100/300/600 mA, 42 V input, step-down DC/DC regulator

LM284x PWM DC/DC Buck RegulatorsTexas Instruments' LM2840, LM2841, and LM2842 are PWM DC/DC buck (step-down) regulators. With a wide input range from 4.5 V to 42 V, they are suitable for a wide range of applications such as power conditioning from unregulated sources. They feature a low RDSON (0.9 Ω 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. This allows the user to tailor the soft-start time to a specific application.

Features
  • Input voltage range of 4.5 V to 42 V
  • Output current options of 100 mA, 300 mA and 600 mA
  • Feedback pin voltage of 0.765 V
  • 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 (SOT-6L package)

Buck Regulators LM2840 Series

ImageManufacturer Part NumberDescriptionAvailable Quantity
LM2840XMK-ADJL/NOPB datasheet linkIC REG BUCK ADJ 0.1A TSOT23-6LM2840XMK-ADJL/NOPBIC REG BUCK ADJ 0.1A TSOT23-61566 - Immediate
LM2840XMK-ADJL/NOPB product page link
LM2840XQMK/NOPB datasheet linkIC REG BUCK ADJ 0.1A TSOT23-6LM2840XQMK/NOPBIC REG BUCK ADJ 0.1A TSOT23-61510 - Immediate
10000 - Factory Stock
LM2840XQMK/NOPB product page link
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Buck Regulators LM2841 Series

ImageManufacturer Part NumberDescriptionAvailable Quantity
LM2841XMK-ADJL/NOPB datasheet linkIC REG BUCK ADJ 0.3A TSOT23-6LM2841XMK-ADJL/NOPBIC REG BUCK ADJ 0.3A TSOT23-69662 - Immediate
LM2841XMK-ADJL/NOPB product page link
LM2841XQMK/NOPB datasheet linkIC REG BUCK ADJ 0.3A TSOT23-6LM2841XQMK/NOPBIC REG BUCK ADJ 0.3A TSOT23-6735 - Immediate
5000 - Factory Stock
LM2841XQMK/NOPB product page link
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Buck Regulators LM2842 Series

ImageManufacturer Part NumberDescriptionAvailable Quantity
LM2842XQMKX/NOPB datasheet linkIC REG BUCK ADJ 0.6A TSOT23-6LM2842XQMKX/NOPBIC REG BUCK ADJ 0.6A TSOT23-64338 - Immediate
LM2842XQMKX/NOPB product page link
LM2842XQMK/NOPB datasheet linkIC REG BUCK ADJ 0.6A TSOT23-6LM2842XQMK/NOPBIC REG BUCK ADJ 0.6A TSOT23-6917 - Immediate
LM2842XQMK/NOPB product page link
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Evaluation Boards

ImageManufacturer Part NumberDescriptionAvailable Quantity
LM2841YMK-ADJEV/NOPB datasheet linkEVAL BOARD FOR LM2841YMK-ADJLM2841YMK-ADJEV/NOPBEVAL BOARD FOR LM2841YMK-ADJ2 - Immediate
23 - Factory Stock
LM2841YMK-ADJEV/NOPB product page link
LM2842XMK-ADJEV/NOPB datasheet linkEVAL BOARD FOR LM2842XMK-ADJLM2842XMK-ADJEV/NOPBEVAL BOARD FOR LM2842XMK-ADJ2 - Immediate
13 - Factory Stock
LM2842XMK-ADJEV/NOPB product page link
Published: 2013-04-10