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 (USD) 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: $2.22 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 $2.22 $1.65 $1.50 $1.35 Reel $1.13 View $1.27 $1.23 $1.19 $1.11 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 IC, PMIC, Buck DC/DC Converter, 2.7V5.5V Input, 0.8V -VIN, 0.6A Output, 2.2MHz Op Frequency, -40+125 BD9S000NUX-CE2 ROHM Semiconductor 1: $1.40 3,082In Stock	Mfr. Part No. BD9S000NUX-CE2 Mouser Part No 755-BD9S000NUX-CE2	ROHM Semiconductor	Switching Voltage Regulators IC, PMIC, Buck DC/DC Converter, 2.7V5.5V Input, 0.8V -VIN, 0.6A Output, 2.2MHz Op Frequency, -40+125 Learn More about ROHM Semiconductor rohm bd9s automotive dcdc converters	Datasheet	3,082In Stock	Cut Tape $1.40 $1.03 $0.93 $0.823 View Reel $0.679 $0.772 $0.742 $0.718 $0.697 $0.679 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 IC, PMIC, Buck DC/DC Converter, 2.7V5.5V Input, 1.8V(Typ), 1.0A Output, 2.2MHz Op Frequency, -40+125 BD9S111NUX-CE2 ROHM Semiconductor 1: $1.81 2,925In Stock	Mfr. Part No. BD9S111NUX-CE2 Mouser Part No 755-BD9S111NUX-CE2	ROHM Semiconductor	Switching Voltage Regulators IC, PMIC, Buck DC/DC Converter, 2.7V5.5V Input, 1.8V(Typ), 1.0A Output, 2.2MHz Op Frequency, -40+125 Learn More about ROHM Semiconductor rohm bd9s automotive dcdc converters	Datasheet	2,925In Stock	Cut Tape $1.81 $1.34 $1.21 $1.08 View Reel $0.911 $1.02 $0.986 $0.965 $0.937 $0.911 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: $2.97 2,560In 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	2,560In Stock	Cut Tape $2.97 $2.26 $2.02 $1.83 Reel $1.57 View $1.73 $1.67 $1.60 $1.45 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 IC, PMIC, Buck DC/DC Converter, 2.7V5.5V Input, 0.8V -VIN, 1.0A Output, 2.2MHz Op Frequency, -40+125 BD9S109NUX-CE2 ROHM Semiconductor 1: $1.27 4,000In Stock New Product	Mfr. Part No. BD9S109NUX-CE2 Mouser Part No 755-BD9S109NUX-CE2 New Product	ROHM Semiconductor	Switching Voltage Regulators IC, PMIC, Buck DC/DC Converter, 2.7V5.5V Input, 0.8V -VIN, 1.0A Output, 2.2MHz Op Frequency, -40+125 Learn More about ROHM Semiconductor rohm bd9s automotive dcdc converters	Datasheet	4,000In Stock	Cut Tape $1.27 $0.923 $0.836 $0.74 View Reel $0.604 $0.694 $0.666 $0.645 $0.635 $0.604	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 IC, PMIC, Buck DC/DC Converter, 2.7V5.5V Input, 0.8V -VIN, 2.0A Output, 2.2MHz Op Frequency, -40+125 BD9S209NUX-CE2 ROHM Semiconductor 1: $1.41 2,100In Stock New Product	Mfr. Part No. BD9S209NUX-CE2 Mouser Part No 755-BD9S209NUX-CE2 New Product	ROHM Semiconductor	Switching Voltage Regulators IC, PMIC, Buck DC/DC Converter, 2.7V5.5V Input, 0.8V -VIN, 2.0A Output, 2.2MHz Op Frequency, -40+125 Learn More about ROHM Semiconductor rohm bd9s automotive dcdc converters	Datasheet	2,100In Stock	Cut Tape $1.41 $1.03 $0.933 $0.826 View Reel $0.679 $0.776 $0.745 $0.718 $0.697 $0.679	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 IC, PMIC, Buck DC/DC Converter, 2.7V5.5V Input, 0.8V -VIN, 1.0A Output, 2.2MHz Op Frequency, -40+125 BD9S100NUX-CE2 ROHM Semiconductor 1: $1.83 2,598In Stock	Mfr. Part No. BD9S100NUX-CE2 Mouser Part No 755-BD9S100NUX-CE2	ROHM Semiconductor	Switching Voltage Regulators IC, PMIC, Buck DC/DC Converter, 2.7V5.5V Input, 0.8V -VIN, 1.0A Output, 2.2MHz Op Frequency, -40+125 Learn More about ROHM Semiconductor rohm bd9s automotive dcdc converters	Datasheet	2,598In Stock	Cut Tape $1.83 $1.34 $1.22 $1.09 View Reel $0.899 $1.03 $0.984 $0.982 $0.948 $0.899 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: $2.61 610In Stock 3,000Expected 2026/12/15	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 2026/12/15	Cut Tape $2.61 $1.95 $1.78 $1.60 View Reel $1.38 $1.51 $1.47 $1.42 $1.38 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 IC, PMIC, Buck DC/DC Converter, 2.7V5.5V Input, 1.2V(Typ), 1.0A Output, 2.2MHz Op Frequency, -40+125 BD9S110NUX-CE2 ROHM Semiconductor 4,000: $0.933 Non-Stocked Lead-Time 13 Weeks	Mfr. Part No. BD9S110NUX-CE2 Mouser Part No 755-BD9S110NUX-CE2	ROHM Semiconductor	Switching Voltage Regulators IC, PMIC, Buck DC/DC Converter, 2.7V5.5V Input, 1.2V(Typ), 1.0A Output, 2.2MHz Op Frequency, -40+125 Learn More about ROHM Semiconductor rohm bd9s automotive dcdc converters	Datasheet	Non-Stocked Lead-Time 13 Weeks	Reel $0.933	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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