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Product details

Parameters

Vin (Min) (V) 4.5 Vin (Max) (V) 42 Vout (Min) (V) 0.765 Vout (Max) (V) 34 Iout (Max) (A) 0.3 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 950 Switching frequency (Max) (kHz) 1500 Features Enable, Over Current Protection Control mode Current Mode Duty cycle (Max) (%) 94 Type Converter Operating temperature range (C) -40 to 125 Rating Catalog open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

SOT-23-THN (DDC) 6 5 mm² 2.9 x 1.6 open-in-new Find other Buck converters (integrated switch)

Features

  • Input voltage 4.5 V to 42 V
  • Output current options of 100 mA, 300 mA, and 600 mA
  • Feedback pin voltage of 0.765 V
  • 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 (SOT-6L package)
  • Create a custom design using the LM2840 (or LM2841/42) with the WEBENCH® Power Designer

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Description

The LM284x SIMPLE SWITCHER™ devices are PWM DC/DC buck (step-down) regulators. With an input range from 4.5 V to 42 V, they are suitable for a wide range of applications, such as power conditioning from unregulated sources. They feature a low RDSON (0.9‑Ω typical) internal switch for maximum efficiency (85% typical). Operating frequency is fixed at 550 kHz (X option) and 1.25 MHz (Y option), 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 (SHDN) 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 up to 300 mA, and the LM2842 for up to 600‑mA load currents. They all have a 0.765-V nominal feedback voltage.

Additional features include: thermal shutdown, VIN undervoltage lockout, and gate-drive undervoltage lockout. The LM284x are available in a low-profile SOT-6L package.

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Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
LMR14203 ACTIVE 4.5V to 42V, 0.3A Step-Down DC/DC Switching Regulator in SOT-23 Next-generation 4.5-V to 42-V, 300-mA SIMPLE SWITCHER buck converter for cost-optimized solution.

Technical documentation

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Type Title Date
* Datasheet LM284x SIMPLE SWITCHER® 4.5-V to 42-V Input, 0.1-, 0.3-, or 0.6-A Output Step-Down DC/DC Regulator in Thin SOT datasheet (Rev. K) Apr. 09, 2019
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Technical articles Quantifying the value of wide VIN Jun. 15, 2016
Technical articles DC/DC converter datasheets – System losses demystified Apr. 25, 2016
Application notes Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
Technical articles DC/DC converter datasheets – System efficiency demystified Apr. 18, 2016
Application notes Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) Sep. 12, 2014
User guides AN-1876 LM2841 Evaluation Board (Rev. C) Apr. 25, 2013
Application notes AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) Apr. 24, 2013
Application notes AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) Apr. 23, 2013
Application notes AN-1197 Selecting Inductors for Buck Converters (Rev. B) Apr. 23, 2013
Application notes AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) Apr. 23, 2013
Application notes AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) Apr. 23, 2013
Application notes AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) Apr. 23, 2013
Application notes AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) Apr. 23, 2013
Application notes AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) Apr. 23, 2013
Application notes AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A) Apr. 23, 2013
Application notes AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) Apr. 23, 2013
Application notes Input and Output Capacitor Selection Sep. 19, 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations Jul. 12, 2005
Application notes AN-643 EMI/RFI Board Design (Rev. B) May 03, 2004

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$49.00
Description

The LM2841 evaluation board is designed to provide the design engineer with a fully functional power converter based on the buck topology to evaluate the LM2841 series of buck regulators. The evaluation board comes populated with the LM2841YMK-ADJL but can easily be modified to accommodate any of (...)

Design tools & simulation

SIMULATION MODELS Download
SNVM224.ZIP (182 KB) - PSpice Model
SIMULATION MODELS Download
SNVM225.ZIP (53 KB) - PSpice Model
SIMULATION MODELS Download
SNVM303.ZIP (52 KB) - PSpice Model
SIMULATION MODELS Download
SNVM304.ZIP (190 KB) - PSpice Model
SIMULATION MODELS Download
SNVM856.ZIP (2 KB) - PSpice Model
SIMULATION MODELS Download
SNVM857.ZIP (1 KB) - PSpice Model
SIMULATION MODELS Download
SNVM858.ZIP (1 KB) - PSpice Model
SIMULATION MODELS Download
SNVM859.ZIP (2 KB) - PSpice Model
SIMULATION MODELS Download
SNVMAW6.TSC (282 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SNVMAW7.TSC (283 KB) - TINA-TI Reference Design

Reference designs

REFERENCE DESIGNS Download
Cranking Simulator Reference Design for Automotive Applications
PMP7233 This design is a cranking simulator which generates three different cranking pulses to test automotive systems up to 50W. A microcontroller sets the output voltage of a synchronous buck in the range of 2-15V accordingly to the programmed curves. Output current is in the range of 3.3-25A. It is a (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
SOT-23-THIN (DDC) 6 View options

Ordering & quality

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