Integrated Circuits (ICs)

LM2840XMK-ADJL/NOPB

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SIMPLE SWITCHER® 42V, 100MA STEP-DOWN DC/DC REGULATOR IN THIN SOT-23

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Search across all available documentation for this part.

DocumentsAN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A)AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A)+12

Integrated Circuits (ICs)

LM2840XMK-ADJL/NOPB

Active

Texas Instruments

SIMPLE SWITCHER® 42V, 100MA STEP-DOWN DC/DC REGULATOR IN THIN SOT-23

Deep-Dive with AI

DocumentsAN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A)AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A)+12

Specifications Series Pricing Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	LM2840XMK-ADJL/NOPB

Current - Output	100 mA
Frequency - Switching	550 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	125 ¯C
Operating Temperature [Min]	-40 °C
Output Configuration	Positive
Output Type	Adjustable
Package / Case	TSOT-23-6, SOT-23-6 Thin
Supplier Device Package	TSOT-23-6
Synchronous Rectifier	False
Topology	Buck
Voltage - Input (Max) [Max]	42 V
Voltage - Input (Min) [Min]	4.5 V
Voltage - Output (Max) [Max]	34 V

LM2840-Q1 Series

SIMPLE SWITCHER® 42V, 100mA Step-Down DC/DC Regulator in Thin SOT-23

Part	Frequency - Switching	Qualification	Voltage - Output (Max) [Max]	Grade	Number of Outputs	Function	Topology	Operating Temperature [Min]	Operating Temperature [Max]	Voltage - Input (Max) [Max]	Current - Output	Output Configuration	Supplier Device Package	Voltage - Input (Min) [Min]	Package / Case	Mounting Type	Output Type
Texas Instruments LM2840XQMK/NOPB	550 kHz	AEC-Q100	34 V	Automotive	1	Step-Down	Buck	-40 °C	125 ¯C	42 V	100 mA	Positive	TSOT-23-6	4.5 V	SOT-23-6 Thin TSOT-23-6	Surface Mount	Adjustable
Texas Instruments LM2840XQMKX/NOPB	550 kHz	AEC-Q100	34 V	Automotive	1	Step-Down	Buck	-40 °C	125 ¯C	42 V	100 mA	Positive	TSOT-23-6	4.5 V	SOT-23-6 Thin TSOT-23-6	Surface Mount	Adjustable
Texas Instruments LM2840YQMK/NOPB	1.25 MHz	AEC-Q100	34 V	Automotive	1	Step-Down	Buck	-40 °C	125 ¯C	42 V	100 mA	Positive	TSOT-23-6	4.5 V	SOT-23-6 Thin TSOT-23-6	Surface Mount	Adjustable
Texas Instruments LM2840YMK-ADJL/NOPB	1.25 MHz		34 V		1	Step-Down	Buck	-40 °C	125 ¯C	42 V	100 mA	Positive	TSOT-23-6	4.5 V	SOT-23-6 Thin TSOT-23-6	Surface Mount	Adjustable
Texas Instruments LM2840YMKX-ADJL/NOPB	1.25 MHz		34 V		1	Step-Down	Buck	-40 °C	125 ¯C	42 V	100 mA	Positive	TSOT-23-6	4.5 V	SOT-23-6 Thin TSOT-23-6	Surface Mount	Adjustable
Texas Instruments LM2840XMK-ADJL/NOPB	550 kHz		34 V		1	Step-Down	Buck	-40 °C	125 ¯C	42 V	100 mA	Positive	TSOT-23-6	4.5 V	SOT-23-6 Thin TSOT-23-6	Surface Mount	Adjustable

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Cut Tape (CT)	1	$ 3.08
		10	$ 2.76
		25	$ 2.61
		100	$ 2.26
		250	$ 2.15
		500	$ 1.93
	Digi-Reel®	1	$ 3.08
		10	$ 2.76
		25	$ 2.61
		100	$ 2.26
		250	$ 2.15
		500	$ 1.93
	Tape & Reel (TR)	1000	$ 1.63
		2000	$ 1.54
		5000	$ 1.49
Texas Instruments	SMALL T&R	1	$ 2.58
		100	$ 2.13
		250	$ 1.53
		1000	$ 1.15

Description

General part information

LM2840-Q1 Series

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, VINundervoltage lockout, and gate-drive undervoltage lockout. The LM284x-Q1 are available in a low-profile SOT-6L package.