LM2840 Datasheet, PDF (1/15 Pages) Texas Instruments – 100/300/600 mA 42V Input Step-Down DC/DC Regulator in Thin SOT-23

LM2840/LM2841/LM2842/
LM2840Q/LM2841Q/
LM2842Q
March 26, 2012
100/300/600 mA 42V Input Step-Down DC/DC Regulator in
Thin SOT-23
General 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 R_DSON (0.9Ω typical) internal switch for maxi-
mum 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 LM2840 is optimized for up to 100 mA, the LM2841 for
300 mA and the LM2842 is optimized for up to 600 mA load
currents. They all have a 0.765V nominal feedback voltage.
Additional features include: thermal shutdown, V_IN under-volt-
age 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 mA, 300 mA and 600 mA}
■ ^{Feedback pin voltage of 0.765V}
■ ^{550 kHz (X) or 1.25 MHz (Y) switching frequency}
■ ^{Low shutdown I}_Q^{, 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 Application Circuit
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