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LM2842 300 mA/600 mA up to 42V Input Step-Down DC/DC Regulator in Thin SOT-23


source: | post time:2010-04-28

Part Number(s)
(NSID)
Top View Type Pins MSL Rating Peak Reflow RoHS
Status
CAD Symbols Models Package
Marking
Format
LM2842XMK-ADJL/NOPB
TSOT 6 1 260 Detail Download N/A
STVB
XTT
LM2842XMKX-ADJL/NOPB
TSOT 6 1 260 Detail Download N/A
STVB
XTT
LM2842YMK-ADJL/NOPB
TSOT 6 1 260 Detail Download N/A
STXB
XTT
LM2842YMKX-ADJL/NOPB
TSOT 6 1 260 Detail Download N/A
STXB
XTT

PDFClick link to Download

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 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 0.765V 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.

Applications

Battery powered equipment
Industrial distributed power applications
Portable media players
Portable hand held instruments

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)

Diagrams

Typical Application
click for larger image

front page schematic, no component values

 

 

 

Block Diagram
click for larger image

Block diagram

 


Typical Performance
click for larger image


 


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