Voltage Regulators - Switching Regulators

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BD9S Series Automotive Buck DC-DC Converters

ROHM Semiconductor BD9S Automotive Buck DC-DC Converters provide high-reliability and low power consumption in a compact form factor with a temperature range of -40°C to +125°C. The BD9S DC-DC Converters feature current-mode control, ensuring fast response to load transients. A fixed 2.2MHz switching frequency prevents interference in the AM Band. This high frequency also allows the use of smaller external components, contributing to a higher degree of miniaturization and power savings. The BD9S Converters also include an enable function to adjust the startup time and a built-in output (Power Good function) indicating correct output voltage has been achieved. These AEC-Q100 qualified (Grade 1) devices support output currents from 0.6A to 4.0A for design flexibility.

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Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (HKD) 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	Switching Frequency	Minimum Operating Temperature	Maximum Operating Temperature	Qualification	Packaging
Switching Voltage Regulators Sync Buck DC/DC Conv 2A MOSFET; 2.7-5.5V BD9S200MUF-CE2 ROHM Semiconductor 1: HK$18.25 7,520In Stock	Mfr. Part No. BD9S200MUF-CE2 Mouser Part No 755-BD9S200MUF-CE2	ROHM Semiconductor	Switching Voltage Regulators Sync Buck DC/DC Conv 2A MOSFET; 2.7-5.5V Learn More about ROHM Semiconductor rohm bd9s automotive dcdc converters	Datasheet	7,520In Stock	Cut Tape HK$18.25 HK$13.56 HK$12.33 HK$11.10 Reel HK$9.29 View HK$10.44 HK$10.11 HK$9.78 HK$9.12 MouseReel Available	Min.: 1 Mult.: 1 : 3,000	SMD/SMT	VQFNFV3030-EP-16	Buck	800 mV to 4.4 V	2 A	1 Output	2.2 MHz	- 40 C	+ 125 C	AEC-Q100	Reel, Cut Tape, MouseReel
Switching Voltage Regulators Secondary switching regulator, 7V, 2.7 5.5V, 0.8V VIN, 0.6A, 2.2MHz BD9S000NUX-CE2 ROHM Semiconductor 1: HK$11.59 3,082In Stock	Mfr. Part No. BD9S000NUX-CE2 Mouser Part No 755-BD9S000NUX-CE2	ROHM Semiconductor	Switching Voltage Regulators Secondary switching regulator, 7V, 2.7 5.5V, 0.8V VIN, 0.6A, 2.2MHz Learn More about ROHM Semiconductor rohm bd9s automotive dcdc converters	Datasheet	3,082In Stock	Cut Tape HK$11.59 HK$8.47 HK$7.64 HK$6.77 View Reel HK$5.58 HK$6.35 HK$6.10 HK$5.89 HK$5.73 HK$5.58 MouseReel Available	Min.: 1 Mult.: 1 : 4,000	SMD/SMT	VSON-8	Buck	800 mV to 5.5 V	600 mA	1 Output	2.2 MHz	- 40 C	+ 125 C	AEC-Q100	Reel, Cut Tape, MouseReel
Switching Voltage Regulators Secondary switching regulator, 7V, 2.7 5.5V, 1.8V(Typ), 1.0A, 2.2MHz BD9S111NUX-CE2 ROHM Semiconductor 1: HK$14.96 2,925In Stock	Mfr. Part No. BD9S111NUX-CE2 Mouser Part No 755-BD9S111NUX-CE2	ROHM Semiconductor	Switching Voltage Regulators Secondary switching regulator, 7V, 2.7 5.5V, 1.8V(Typ), 1.0A, 2.2MHz Learn More about ROHM Semiconductor rohm bd9s automotive dcdc converters	Datasheet	2,925In Stock	Cut Tape HK$14.96 HK$11.01 HK$10.03 HK$8.96 View Reel HK$7.53 HK$8.47 HK$8.10 HK$8.06 HK$7.57 HK$7.53 MouseReel Available	Min.: 1 Mult.: 1 : 4,000	SMD/SMT	VSON-8	Buck	1.8 V	1 A	1 Output	2.2 MHz	- 40 C	+ 125 C	AEC-Q100	Reel, Cut Tape, MouseReel
Switching Voltage Regulators Sync Buck DC/DC Conv 4A MOSFET; 2.7-5.5V BD9S400MUF-CE2 ROHM Semiconductor 1: HK$24.66 2,430In Stock	Mfr. Part No. BD9S400MUF-CE2 Mouser Part No 755-BD9S400MUF-CE2	ROHM Semiconductor	Switching Voltage Regulators Sync Buck DC/DC Conv 4A MOSFET; 2.7-5.5V Learn More about ROHM Semiconductor rohm bd9s automotive dcdc converters	Datasheet	2,430In Stock	Cut Tape HK$24.66 HK$18.50 HK$16.93 HK$15.21 Reel HK$12.91 View HK$14.39 HK$14.14 HK$13.40 HK$11.92 MouseReel Available	Min.: 1 Mult.: 1 : 3,000	SMD/SMT	VQFNFV3030-EP-16	Buck	800 mV to 4.4 V	4 A	1 Output	2.2 MHz	- 40 C	+ 125 C	AEC-Q100	Reel, Cut Tape, MouseReel
Switching Voltage Regulators Secondary switching regulator, 7V, 2.7 5.5V, 0.8V VIN, 1.0A, 2.2MHz BD9S109NUX-CE2 ROHM Semiconductor 1: HK$10.44 4,000In Stock New Product	Mfr. Part No. BD9S109NUX-CE2 Mouser Part No 755-BD9S109NUX-CE2 New Product	ROHM Semiconductor	Switching Voltage Regulators Secondary switching regulator, 7V, 2.7 5.5V, 0.8V VIN, 1.0A, 2.2MHz Learn More about ROHM Semiconductor rohm bd9s automotive dcdc converters	Datasheet	4,000In Stock	Cut Tape HK$10.44 HK$7.59 HK$6.87 HK$6.08 View Reel HK$4.96 HK$5.70 HK$5.47 HK$5.30 HK$5.22 HK$4.96	Min.: 1 Mult.: 1 : 4,000	SMD/SMT	VSON008X2020-7	Buck	800 mV to 5.5 V	1 A	1 Output	2.2 MHz	- 40 C	+ 125 C	AEC-Q100	Reel, Cut Tape
Switching Voltage Regulators Secondary switching regulator, 7V, 2.7 5.5V, 0.8V VIN, 2.0A, 2.2MHz BD9S209NUX-CE2 ROHM Semiconductor 1: HK$11.59 2,100In Stock New Product	Mfr. Part No. BD9S209NUX-CE2 Mouser Part No 755-BD9S209NUX-CE2 New Product	ROHM Semiconductor	Switching Voltage Regulators Secondary switching regulator, 7V, 2.7 5.5V, 0.8V VIN, 2.0A, 2.2MHz Learn More about ROHM Semiconductor rohm bd9s automotive dcdc converters	Datasheet	2,100In Stock	Cut Tape HK$11.59 HK$8.47 HK$7.66 HK$6.79 View Reel HK$5.58 HK$6.37 HK$6.12 HK$5.89 HK$5.73 HK$5.58	Min.: 1 Mult.: 1 : 4,000	SMD/SMT	VSON008X2020-8	Buck	800 mV to 5.5 V	2 A	1 Output	2.2 MHz	- 40 C	+ 125 C	AEC-Q100	Reel, Cut Tape
Switching Voltage Regulators Secondary switching regulator, 7V, 2.7 5.5V, 0.8V VIN, 1.0A, 2.2MHz BD9S100NUX-CE2 ROHM Semiconductor 1: HK$14.96 2,598In Stock	Mfr. Part No. BD9S100NUX-CE2 Mouser Part No 755-BD9S100NUX-CE2	ROHM Semiconductor	Switching Voltage Regulators Secondary switching regulator, 7V, 2.7 5.5V, 0.8V VIN, 1.0A, 2.2MHz Learn More about ROHM Semiconductor rohm bd9s automotive dcdc converters	Datasheet	2,598In Stock	Cut Tape HK$14.96 HK$11.01 HK$10.03 HK$8.96 View Reel HK$7.53 HK$8.47 HK$8.09 HK$8.06 HK$7.79 HK$7.53 MouseReel Available	Min.: 1 Mult.: 1 : 4,000	SMD/SMT	VSON-8	Buck	800 mV to 5.5 V	1 A	1 Output	2.2 MHz	- 40 C	+ 125 C	AEC-Q100	Reel, Cut Tape, MouseReel
Switching Voltage Regulators Sync Buck DC/DC Conv 3A MOSFET; 2.7-5.5V BD9S300MUF-CE2 ROHM Semiconductor 1: HK$21.45 610In Stock 3,000Expected 15/12/2026	Mfr. Part No. BD9S300MUF-CE2 Mouser Part No 755-BD9S300MUF-CE2	ROHM Semiconductor	Switching Voltage Regulators Sync Buck DC/DC Conv 3A MOSFET; 2.7-5.5V Learn More about ROHM Semiconductor rohm bd9s automotive dcdc converters	Datasheet	610In Stock 3,000Expected 15/12/2026	Cut Tape HK$21.45 HK$16.03 HK$14.63 HK$13.15 View Reel HK$11.34 HK$12.41 HK$12.08 HK$11.67 HK$11.34 MouseReel Available	Min.: 1 Mult.: 1 : 3,000	SMD/SMT	VQFNFV3030-EP-16	Buck	800 mV to 4.4 V	3 A	1 Output	2.2 MHz	- 40 C	+ 125 C	AEC-Q100	Reel, Cut Tape, MouseReel
Switching Voltage Regulators Secondary switching regulator, 7V, 2.7 5.5V, 1.2V(Typ), 1.0A, 2.2MHz BD9S110NUX-CE2 ROHM Semiconductor 4,000: HK$7.80 Non-Stocked Lead-Time 13 Weeks	Mfr. Part No. BD9S110NUX-CE2 Mouser Part No 755-BD9S110NUX-CE2	ROHM Semiconductor	Switching Voltage Regulators Secondary switching regulator, 7V, 2.7 5.5V, 1.2V(Typ), 1.0A, 2.2MHz Learn More about ROHM Semiconductor rohm bd9s automotive dcdc converters	Datasheet	Non-Stocked Lead-Time 13 Weeks	Reel HK$7.80	Min.: 4,000 Mult.: 4,000 : 4,000	SMD/SMT	VSON-8	Buck	1.2 V	1 A	1 Output	2.2 MHz	- 40 C	+ 125 C	AEC-Q100	Reel

BD9S Series Automotive Buck DC-DC Converters

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