LM2841_15 Datasheet, PDF (1/20 Pages) Texas Instruments – Input Step-Down DC/DC Regulator in Thin SOT

LM2841, LM2842
www.ti.com
SNVS540H – MARCH 2009 – REVISED APRIL 2013
LM2840/LM2841/LM2842/ LM2840-Q1/LM2841-Q1/LM2842-Q1 100/300/600 mA 42V Input
Step-Down DC/DC Regulator in Thin SOT
Check for Samples: LM2841, LM2842
FEATURES
1
•2 LM2840Q, LM2841-Q1 and LM2842-Q1 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 (SOT-6L Package)
APPLICATIONS
• Battery Powered Equipment
• Industrial Distributed Power Applications
• Portable Media Players
• Portable Hand Held Instruments
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 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 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-voltage lockout, and gate drive under-voltage
lockout. The LM2840, LM2841 and LM2842 are
available in a low profile SOT-6L package.
Typical Application Circuit
VIN
C_IN
LM2840/1/2-ADJL
V_IN
CB
SHDN
SW
GND
FB
C_BOOT
R1
R2
L1
D1
VOUT
C_OUT
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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