Voltage Regulators - Switching Regulators

LMR514x0/LMR514x0-Q1 Step-Down DC/DC Converters

Texas Instruments LMR514x0/LMR514x0-Q1 Synchronous Step-Down DC/DC Converters are wide-V_IN, easy-to-use synchronous buck converters capable of driving up to 4A or 5A load current. With a wide input range of 4V to 36V, the device is suitable for various industrial applications for power conditioning from an unregulated source. The LMR514x0/LMR514x0-Q1 features an adjustable switching frequency from 200kHz to 1.1MHz with an external resistor, providing the flexibility to optimize efficiency or external component size. The device has a PFM version to realize high efficiency at light load and an FPWM version to achieve constant frequency and small output voltage ripple over the full load range. Soft-start and compensation circuits are implemented internally, which allows the device to be used with minimum external components.

Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (PEN) Filter the results in the table by unit price based on your quantity.	Qty.	Mounting Style	Package / Case	Topology	Output Voltage	Output Current	Number of Outputs	Quiescent Current	Switching Frequency	Minimum Operating Temperature	Maximum Operating Temperature	Series	Packaging
Switching Voltage Regulators Automotive 36V 4A Sy nchronous buck con LMR51440SQDRRRQ1 Texas Instruments 1: S/8.60 6,016In Stock	Mfr. Part # LMR51440SQDRRRQ1 Mouser Part # 595-LMR51440SQDRRRQ1	Texas Instruments	Switching Voltage Regulators Automotive 36V 4A Sy nchronous buck con Learn More about Texas Instruments ti lmr514x0 step down dc dc converters	Datasheet	6,016In Stock	Cut Tape S/8.60 S/6.34 S/5.76 S/5.14 View Reel S/4.79 S/4.87 S/4.79 S/4.79	Min.: 1 Mult.: 1 Max.: 1,001 : 3,000	SMD/SMT	WSON-12	Buck	800 mV to 28 V	4 A	1 Output	25 uA	200 kHz to 1 MHz	- 40 C	+ 125 C	LMR51440	Reel, Cut Tape
Switching Voltage Regulators 36-V 5-A synchronou s buck converter 12- LMR51450FNDRRR Texas Instruments 1: S/8.87 7,245In Stock	Mfr. Part # LMR51450FNDRRR Mouser Part # 595-LMR51450FNDRRR	Texas Instruments	Switching Voltage Regulators 36-V 5-A synchronou s buck converter 12- Learn More about Texas Instruments ti lmr514x0 step down dc dc converters	Datasheet	7,245In Stock	Cut Tape S/8.87 S/6.58 S/5.99 S/5.37 View Reel S/4.52 S/5.06 S/4.90 S/4.83 S/4.52 MouseReel Available	Min.: 1 Mult.: 1 : 3,000	SMD/SMT	WSON-12	Buck	28 V	5 A	1 Output	25 uA	1.1 MHz	- 40 C	+ 150 C	LMR51450	Reel, Cut Tape, MouseReel
Switching Voltage Regulators Automotive 36V 6A Sy nchronous buck con LMR51450FSQDRRRQ1 Texas Instruments 1: S/8.68 3,291In Stock	Mfr. Part # LMR51450FSQDRRRQ1 Mouser Part # 595-LMR51450FSQDRRQ1	Texas Instruments	Switching Voltage Regulators Automotive 36V 6A Sy nchronous buck con Learn More about Texas Instruments ti lmr514x0 step down dc dc converters	Datasheet	3,291In Stock	Cut Tape S/8.68 S/6.46 S/5.88 S/5.25 View Reel S/4.90 S/4.98 S/4.90 S/4.90	Min.: 1 Mult.: 1 Max.: 1,001 : 3,000	SMD/SMT	WSON-12	Buck	800 mV to 38 V	5 A	1 Output	25 uA	200 kHz to 1 MHz	- 40 C	+ 125 C	LMR51450	Reel, Cut Tape
Switching Voltage Regulators Automotive 36V 6A Sy nchronous buck con LMR51450SQDRRRQ1 Texas Instruments 1: S/8.72 2,739In Stock	Mfr. Part # LMR51450SQDRRRQ1 Mouser Part # 595-LMR51450SQDRRRQ1	Texas Instruments	Switching Voltage Regulators Automotive 36V 6A Sy nchronous buck con Learn More about Texas Instruments ti lmr514x0 step down dc dc converters	Datasheet	2,739In Stock	Cut Tape S/8.72 S/6.46 S/5.88 S/5.25 Reel S/4.63 View S/4.98 S/4.83 S/4.67 S/4.48	Min.: 1 Mult.: 1 : 3,000	SMD/SMT	WSON-12	Buck	800 mV to 38 V	5 A	1 Output	25 uA	200 kHz to 1 MHz	- 40 C	+ 125 C	LMR51450	Reel, Cut Tape
Switching Voltage Regulators Automotive 36V 4A Sy nchronous buck con LMR51440FSQDRRRQ1 Texas Instruments 1: S/8.99 128In Stock 9,000On Order	Mfr. Part # LMR51440FSQDRRRQ1 Mouser Part # 595-LMR51440FSQDRRQ1	Texas Instruments	Switching Voltage Regulators Automotive 36V 4A Sy nchronous buck con Learn More about Texas Instruments ti lmr514x0 step down dc dc converters	Datasheet	128In Stock 9,000On Order On Order Ship Dates Mfr. #: LMR51440FSQDRRRQ1 Stock: 128 Can Ship Immediately On Order: 6,000 Expected 9/29/2026 3,000 Expected 2/1/2027 Factory Lead-Time: 26 Weeks	Cut Tape S/8.99 S/6.66 S/6.07 S/5.41 View Reel S/4.55 S/4.98 S/4.79 S/4.55 S/4.55	Min.: 1 Mult.: 1 Max.: 1,001 : 3,000	SMD/SMT	WSON-12	Buck	800 mV to 28 V	4 A	1 Output	25 uA	200 kHz to 1 MHz	- 40 C	+ 125 C	LMR51440	Reel, Cut Tape
Switching Voltage Regulators 36-V 4-A synchronou s buck converter 12- LMR51440SDRRR Texas Instruments 1: S/8.84 43In Stock 6,000Expected 10/5/2026	Mfr. Part # LMR51440SDRRR Mouser Part # 595-LMR51440SDRRR	Texas Instruments	Switching Voltage Regulators 36-V 4-A synchronou s buck converter 12- Learn More about Texas Instruments ti lmr514x0 step down dc dc converters	Datasheet	43In Stock 6,000Expected 10/5/2026	Cut Tape S/8.84 S/6.54 S/5.96 S/5.33 Reel S/4.52 View S/5.02 S/4.87 S/4.63 S/4.28 MouseReel Available	Min.: 1 Mult.: 1 : 3,000	SMD/SMT	WSON-12	Buck	28 V	4 A	1 Output	25 uA	1.1 MHz	- 40 C	+ 150 C	LMR51440	Reel, Cut Tape, MouseReel
Switching Voltage Regulators 36-V 5-A synchronou s buck converter 12- LMR51450SDRRR Texas Instruments 1: S/9.15 22,461Expected 10/12/2026	Mfr. Part # LMR51450SDRRR Mouser Part # 595-LMR51450SDRRR	Texas Instruments	Switching Voltage Regulators 36-V 5-A synchronou s buck converter 12- Learn More about Texas Instruments ti lmr514x0 step down dc dc converters	Datasheet	22,461Expected 10/12/2026	Cut Tape S/9.15 S/6.77 S/6.19 S/5.53 Reel S/4.48 View S/5.22 S/5.06 S/4.94 S/4.36 MouseReel Available	Min.: 1 Mult.: 1 : 3,000	SMD/SMT	WSON-12	Buck	28 V	5 A	1 Output	25 uA	1.1 MHz	- 40 C	+ 150 C	LMR51450	Reel, Cut Tape, MouseReel

LMR514x0/LMR514x0-Q1 Step-Down DC/DC Converters

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