Startseite Energiemanagement AC/DC & DC/DC converters (integrated FET)
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Energiemanagement
AC/DC & DC/DC converters (integrated FET)

LM2842

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SIMPLE SWITCHER®-DC/DC-Schaltregler (4,5 V bis 42 V, 0,6 A) in einem Thin SOT-23

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LM2842

AKTIV
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Produktdetails

Iout (max) (A) 0.6 Vin (min) (V) 4.5 Vin (max) (V) 42 Topology Buck Type Converter Switching frequency (min) (kHz) 950 Switching frequency (max) (kHz) 1500 Features Enable, Over Current Protection Control mode current mode Vout (min) (V) 0.765 Vout (max) (V) 34 Rating Catalog Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0013
Iout (max) (A) 0.6 Vin (min) (V) 4.5 Vin (max) (V) 42 Topology Buck Type Converter Switching frequency (min) (kHz) 950 Switching frequency (max) (kHz) 1500 Features Enable, Over Current Protection Control mode current mode Vout (min) (V) 0.765 Vout (max) (V) 34 Rating Catalog Operating temperature range (°C) -40 to 125 Iq (typ) (A) 0.0013
SOT-23-THN (DDC) 6 8.12 mm² 2.9 x 2.8
  • 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
  • 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

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.

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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Technische Dokumentation

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Typ Titel Datum
* Data sheet 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) PDF | HTML 09 Apr 2019
Application note Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 25 Mär 2024
Technical article Quantifying the value of wide VIN PDF | HTML 15 Jun 2016
Technical article DC/DC converter datasheets – System losses demystified PDF | HTML 25 Apr 2016
Technical article DC/DC converter datasheets – System efficiency demystified PDF | HTML 18 Apr 2016
Application note Low EMI Layout Made SIMPLE With LM43600/1/2/3 and LM46000/1/2 (Rev. A) 12 Sep 2014
EVM User's guide AN-1908 LM2842 Evaluation Board (Rev. D) 25 Apr 2013
Application note AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) 24 Apr 2013
Application note AN-1149 Layout Guidelines for Switching Power Supplies (Rev. C) 23 Apr 2013
Application note AN-1197 Selecting Inductors for Buck Converters (Rev. B) 23 Apr 2013
Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) 23 Apr 2013
Application note AN-1246 Stresses in Wide Input DC-DC Converters (Rev. C) 23 Apr 2013
Application note AN-1520 A Guide to Board Layout for Best Thermal Resistance for Exposed Packages (Rev. B) 23 Apr 2013
Application note AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) 23 Apr 2013
Application note AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) 23 Apr 2013
Application note AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A) 23 Apr 2013
Application note AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) 23 Apr 2013
Application note Input and Output Capacitor Selection 19 Sep 2005
More literature SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations 12 Jul 2005
Application note AN-643 EMI/RFI Board Design (Rev. B) 03 Mai 2004

Design und Entwicklung

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Evaluierungsplatine

LM2842XMK-ADJEV — Evaluierungsplatine für den LM2842

The LM2842 evaluation board is designed to provide the design engineer with a fully functional power converter based on the buck topology to evaluate the LM2842 series of buck regulators. The evaluation board comes populated with the LM2842XMK-ADJL but can easily be modified to accommodate any of (...)

Benutzerhandbuch: PDF
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LM2842X PSpice Average Model

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LM2842X Unencrypted PSpice Average Model

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LM2842X Unencrypted PSpice Transient Model

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LM2842Y PSpice Transient Model

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LM2842Y Unencrypted PSpice Average Model

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LM2842Y Unencrypted PSpice Transient Model

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Referenzdesigns

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The PMP9311 is a low power capacitor-drop type of offline converter that takes a 50Hz AC input of 85V to 230V and puts out a regulated DC 3.3V at up to 85mA. It is used for electronic electricity meters where apparent power consumption is regulated and galvanic isolation is not required. The high (...)
Test report: PDF
Schaltplan: PDF
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SOT-23-THN (DDC) 6 Optionen anzeigen
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Bestellen & Qualität

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