LM2842YMK-ADJL/NOPB Circuit Board Chips Electronics Components Step-Down DC/DC Regulator in Thin SOT-23
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General 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 con-ditioning 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 ver-sion) 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 shut-down pin with an external RC circuit allowing the user to tailorthe 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, VIN under-volt-age lockout, and gate drive under-voltage lockout. The LM2841 and LM2842 are available in a low profile TSOT-6L package.
Features
■ Input voltage range of 4.5V to 42V
■ 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)
Applications
■ Battery powered equipment
■ Industrial distributed power applications
■ Portable media players
■ Portable hand held instruments
Typical Performance Characteristics
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