Integrated Circuits (ICs)

LMR14203XMKE/NOPB

Active

4.5V TO 42V, 0.3A STEP-DOWN DC/DC SWITCHING REGULATOR IN SOT-23

Deep-Dive with AI

Search across all available documentation for this part.

DocumentsAN-2185 LMR14203/LMR14206 Demonstation Board (Rev. B)AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A)+17

Integrated Circuits (ICs)

LMR14203XMKE/NOPB

Active

Texas Instruments

4.5V TO 42V, 0.3A STEP-DOWN DC/DC SWITCHING REGULATOR IN SOT-23

Deep-Dive with AI

DocumentsAN-2185 LMR14203/LMR14206 Demonstation Board (Rev. B)AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A)+17

Specifications Series Pricing Description Documents

Technical Specifications

Parameters and characteristics for this part

Specification	LMR14203XMKE/NOPB

Current - Output	300 mA
Frequency - Switching	1.25 MHz
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	SOT-23-THIN
Synchronous Rectifier	False
Topology	Buck
Voltage - Input (Max) [Max]	42 V
Voltage - Input (Min) [Min]	4.5 V
Voltage - Output (Max) [Max]	34 V

LMR14203 Series

Part	Topology	Current - Output	Output Type	Number of Outputs	Frequency - Switching	Package / Case	Mounting Type	Supplier Device Package	Operating Temperature [Min]	Operating Temperature [Max]	Function	Voltage - Input (Max) [Max]	Voltage - Input (Min) [Min]	Output Configuration	Voltage - Output (Max) [Max]	Regulator Topology	Outputs and Type	Outputs and Type	Main Purpose	Supplied Contents	Voltage - Input [Max]	Voltage - Input [Min]	Board Type	Voltage - Output	Utilized IC / Part
Texas Instruments LMR14203XMKE/NOPB	Buck	300 mA	Adjustable	1	1.25 MHz	SOT-23-6 Thin TSOT-23-6	Surface Mount	SOT-23-THIN	-40 °C	125 ¯C	Step-Down	42 V	4.5 V	Positive	34 V
Texas Instruments LMR14203XMKDEMO/NOPB		300 mA			1.25 MHz											Buck	Non-Isolated	1	DC/DC Step Down	Board(s)	42 V	4.5 V	Fully Populated	1.2 V	LMR14203
Texas Instruments LMR14203XMKX/NOPB	Buck	300 mA	Adjustable	1	1.25 MHz	SOT-23-6 Thin TSOT-23-6	Surface Mount	SOT-23-THIN	-40 °C	125 ¯C	Step-Down	42 V	4.5 V	Positive	34 V

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	$ 2.46
		10	$ 1.83
		25	$ 1.67
		100	$ 1.50
	Digi-Reel®	1	$ 2.46
		10	$ 1.83
		25	$ 1.67
		100	$ 1.50
	Tape & Reel (TR)	250	$ 1.42
		500	$ 1.37
		750	$ 1.34
		1250	$ 1.31
		1750	$ 1.30
		2500	$ 1.28
		6250	$ 1.25
Texas Instruments	SMALL T&R	1	$ 1.88
		100	$ 1.64
		250	$ 1.15
		1000	$ 0.93

Description

General part information

LMR14203 Series

The LMR14203 is a PWM DC/DC buck (step-down) regulator. With a wide input range from 4.5V-42V, it is suitable for a wide range of applications such as power conditioning from unregulated sources. They feature a low RDSON(0.9Ω typical) internal switch for maximum efficiency (85% typical). Operating frequency is fixed at 1.25 MHz 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 pin with an external RC circuit allowing the user to tailor the soft-start time to a specific application.

The LMR14203 is optimized for up to 300 mA load current.

Additional features include: thermal shutdown, VINunder-voltage lockout, and gate drive under-voltage lockout. The LMR14203 is available in a low profile SOT-6L package.