LM2842XMK-ADJL+ National Semiconductor, LM2842XMK-ADJL+ Datasheet

LM2842XMK-ADJL+

Manufacturer Part Number

LM2842XMK-ADJL+

Description

Manufacturer

National Semiconductor

Datasheets

1.LM2842YMKX-ADJL.pdf (14 pages)

2.LM2842XMK-ADJL.pdf (16 pages)

Specifications of LM2842XMK-ADJL+

Notes

NEW

Date_code

10+

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300 mA/600 mA up to 42V Input Step-Down DC/DC

Regulator in Thin SOT-23

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

(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 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, V

age lockout, and gate drive under-voltage lockout. The

LM2841 and LM2842 are available in a low profile TSOT-6L

package.

Typical Application Circuit

DSON

(0.9Ω typical) internal switch for maximum efficiency

300367

under-volt-

LM2841

LM2842

Features

■

Applications

■

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 I

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

, 16 µA typical

30036702

www.national.com

April 2, 2009

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