LM2841/42 Step-Down DC/DC Regulators

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

LM2841/42 - Step-Down DC/DC RegulatorsTexas Instruments' LM2841 and LM2842 are PWM DC/DC buck (step-down) regulators. With a wide input range from 4.5 V-42 V, 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 0.765 V 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.

Features Applications
  • Input voltage range of 4.5 V to 42 V
  • 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)
  • Battery powered equipment
  • Industrial distributed power applications
  • Portable media players
  • Portable hand held instruments

Step Down DC-DC Regulators

ImageManufacturer Part NumberDescriptionAvailable Quantity
LM2841XMK-ADJL/NOPB datasheet linkIC REG BUCK ADJ 0.3A TSOT23-6LM2841XMK-ADJL/NOPBIC REG BUCK ADJ 0.3A TSOT23-614894 - Immediate
10000 - Factory Stock
LM2841XMK-ADJL/NOPB product page link
LM2841YMK-ADJL/NOPB datasheet linkIC REG BUCK ADJ 0.3A TSOT23-6LM2841YMK-ADJL/NOPBIC REG BUCK ADJ 0.3A TSOT23-616976 - Immediate
10000 - Factory Stock
LM2841YMK-ADJL/NOPB product page link
LM2842XMK-ADJL/NOPB datasheet linkIC REG BUCK ADJ 0.6A TSOT23-6LM2842XMK-ADJL/NOPBIC REG BUCK ADJ 0.6A TSOT23-68603 - Immediate
LM2842XMK-ADJL/NOPB product page link
LM2842YMK-ADJL/NOPB datasheet linkIC REG BUCK ADJ 0.6A TSOT23-6LM2842YMK-ADJL/NOPBIC REG BUCK ADJ 0.6A TSOT23-61987 - Immediate
1000 - Factory Stock
LM2842YMK-ADJL/NOPB product page link
Published: 2013-07-02