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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) 0.6 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 950 Switching frequency (Max) (kHz) 1500 Features Enable, Over Current Protection, Soft Start Fixed Control mode Current Mode Duty cycle (Max) (%) 94 Type Converter Operating temperature range (C) -40 to 125 Rating Automotive 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

  • AEC-Q100-qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • 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-Q1 (or LM2841-Q1/42-Q1) with the WEBENCH® Power Designer

All trademarks are the property of their respective owners.

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Description

The LM284x-Q1 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-Q1 is optimized for up to 100 mA, the LM2841-Q1 for up to 300 mA, and the LM2842-Q1 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-Q1 are available in a low-profile SOT-6L package.

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Technical documentation

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Type Title Date
* Datasheet LM284x-Q1 Automotive 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 Apr. 25, 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-1908 LM2842 Evaluation Board (Rev. D) 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 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 (...)

Design tools & simulation

SIMULATION MODELS Download
SNVM323.ZIP (108 KB) - PSpice Model
SIMULATION MODELS Download
SNVM324.ZIP (102 KB) - PSpice Model
SIMULATION MODELS Download
SNVM902.ZIP (1 KB) - PSpice Model
SIMULATION MODELS Download
SNVM903.ZIP (1 KB) - PSpice Model

Reference designs

REFERENCE DESIGNS Download
Automotive Resolver-to-Digital Converter Reference Design for Safety Application
TIDA-00796 TIDA-00796 reference design is a complete resolver solution based on system-on-chip (SoC) PGA411-Q1 sensor interface. Typical application for the design is in electric vehicle (EV) and hybrid electric vehicle (HEV) powertrain systems. The PGA411-Q1 based design solves excitation amplifier, boost (...)
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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