LM2842

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SIMPLE SWITCHER® 4.5V to 42V, 0.6A Step-Down DC/DC Switching Regulator in Thin SOT-23

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Data sheet

document-pdfAcrobat 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

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LMR54406

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SIMPLE SWITCHER® power converter with 4-V to 36-V input, 0.6-A, synchronous buck and 80-µA IQ Smaller footprint, lower quiescent current, FPWM and PFM options.

LM2842

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Data sheet

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Product details

Rating

Catalog

Operating temperature range (°C)

-40 to 125

Topology

Buck

Type

Converter

Iout (max) (A)

0.6

Vin (min) (V)

4.5

Vin (max) (V)

42

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

Iq (typ) (µA)

1300

Duty cycle (max) (%)

94

Rating

Catalog

Operating temperature range (°C)

-40 to 125

Topology

Buck

Type

Converter

Iout (max) (A)

0.6

Vin (min) (V)

4.5

Vin (max) (V)

42

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

Iq (typ) (µA)

1300

Duty cycle (max) (%)

94

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 I_Q: 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 I_Q: 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 R_DSON (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, V_IN 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 R_DSON (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, V_IN undervoltage lockout, and gate-drive undervoltage lockout. The LM284x are available in a low-profile SOT-6L package.

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Technical documentation

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	Type	Title		Date
*	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 Mar 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 May 2004

Design & development

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

Evaluation board

LM2842XMK-ADJEV — Evaluation Board for the 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 (...)

User guide: PDF