LM284x PWM DC/DC Buck Regulators



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


Texas Instruments LM284x PWM DC-DC Buck Regulators Texas 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)

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Digi-Key
Part Number
Texas Instruments
Part Number
Description  
LM2840XQMK/NOPBTR-ND LM2840XQMK/NOPB IC REG BUCK ADJ 0.1A TSOT23-6 LM284x Datasheet
LM2840XMK-ADJL/NOPBTR-ND LM2840XMK-ADJL/NOPB IC REG BUCK ADJ 0.1A TSOT23-6
View All LM2840 Series Regulators
LM2841XMK-ADJL/NOPBTR-ND LM2841XMK-ADJL/NOPB IC REG BUCK ADJ 0.3A TSOT23-6
LM2841YMK-ADJL/NOPBTR-ND LM2841YMK-ADJL/NOPB IC REG BUCK ADJ 0.3A TSOT23-6
View All LM2841 Series Regulators
LM2842XMK-ADJL/NOPBTR-ND LM2842XMK-ADJL/NOPB IC REG BUCK ADJ 0.6A TSOT23-6
LM2842YMK-ADJL/NOPBTR-ND LM2842YMK-ADJL/NOPB IC REG BUCK ADJ 0.6A TSOT23-6
View All LM2842 Series Regulators

Evaluation Boards
Digi-Key
Part Number
Texas Instruments
Part Number
Description  
LM2841YMK-ADJEV/NOPB-ND LM2841YMK-ADJEV/NOPB EVAL BOARD FOR LM2841YMK-ADJ LM2841YMK-ADJEV/NOPB User's Guide
LM2842XMK-ADJEV/NOPB-ND LM2842XMK-ADJEV/NOPB EVAL BOARD FOR LM2842XMK-ADJ LM2842XMK-ADJEV/NOPB User's Guide

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