ROHM Semiconductor Distributor

Flexible Step-Down Switching Regulators


Step-down switching regulators with integrated MOSFETs from ROHM


ROHM Semiconductor's Flexible Step-Down Switching RegulatorsROHM Semiconductor provides a number of step down switching regulators with integrated MOSFETs. These solutions provide simple step-down power management, used in significant numbers for several applications. From the incorporation of shutdown functionality to increased efficiency, switching regulators offer numerous benefits over industry standard options such as linear regulators.

The BD9G101G is a switching regulator with integrated internal high-side 42 V Power MOSFET. It provides 0.5 A DC output with a small SOT23 package. Its operating frequency is fixed at 1.5 MHz, allowing the use of small inductors and ceramic capacitors. The components of phase compensation are built in. The BD9G101G is SOT-23-6 (SSOP6) package.

The ROHM BD9329EFJ can provide up to 3 A and the BD9328 can provide up to 2 A of output current at the required output voltage. These devices also feature a wide input voltage range which can be as high as 18 V and as low as 4.2 V. These devices have a built-in power MOSFET with low RDS(ON) to reduce the number of external components required for the application circuit. A 0.9 V internal reference is used in the error amplifier circuit to minimize the components needed for setting the output voltage. The equation for setting the output voltage is (R1+R2/R2) x (0.9). Output voltage can be set anywhere from 0.9 V to maximum of VCC x 0.7.

The ROHM BD9673EFJ/BD9876EFJ can provide up to 3 A of output current at the required output voltage. These devices also provide a wide input voltage range, which can be as high as 45 V and as low as 7 V, and have a built-in power MOSFET with low RDS(ON) to reduce the number of external components required for the application circuit. A 1.0 V internal reference is used in the error amplifier circuit to minimize the components needed for setting the output voltage. The equation for setting output voltage is (R1+R2/R2). Output voltage can be set anywhere from 1 V to a maximum of VCC x 0.7.

BD9328EFJ and BD9329AEFJ Features BD9673EFJ and BD9876EFJ Features
  • Output current up to 3 A (BD9329AEFJ) and up to 2 A (BD9328EFJ)
  • Wide input voltage range from 4.2 V to 18.0 V
  • Integrated power MOSFET with 150 mΩ RONH and 130 mΩ RONL
  • Adjustable output voltage: 0.9 V to VIN x 0.7 V
  • Feedback voltage 0.9 V ±1.5% at room temperature (±2.0% for -25°C to 85°C)
  • Output current up to 3 A
  • Wide input voltage range up to 45 V
  • Integrated power MOSFET with 200 mΩ RDS(ON)
  • Adjustable output voltage: 1 to VCC x 0.7 V
  • Feedback voltage 1.0 V ±1%

BD9G101G Features
  • High and wide input range (VCC = 6 V ~ 42 V)
  • 45 V / 800 mΩ internal power MOSFET
  • 1.5 MHz fixed operating frequency
  • Feedback pin voltage 0.75 V ±1.5%
  • Internal compensated
  • Internal over current protection, under voltage locked out, thermal shutdown
  • 0 μA shutdown supply current
  • 6-lead SOT-23 package (SSOP6)

Digi-Key P/N Manufacturer P/N Description  
BD9328EFJ-E2CT-ND BD9328EFJ-E2 IC REG BUCK SYNC ADJ 2A 8HTSOP Datasheet
BD9329AEFJ-E2CT-ND BD9329AEFJ-E2 IC REG BUCK SYNC ADJ 3A 8HTSOP Datasheet
BD9673EFJ-E2CT-ND BD9673EFJ-E2 IC REG BUCK SYNC ADJ 1.5A HTSOP8 Datasheet
BD9876EFJ-E2CT-ND BD9876EFJ-E2 IC REG BUCK SYNC ADJ 3A HTSOP8 Datasheet
BD9328EFJ_EVK-ND BD9328EFJ_EVK BOARD EVAL BUCK REG BD9328 Datasheet
BD9329AEFJ_EVK-ND BD9329AEFJ_EVK BOARD EVAL BUCK REG BD9329A Datasheet
BD9673EFJ_EVK-ND BD9673EFJ_EVK BOARD EVAL BUCK REG BD9673 Datasheet
BD9876EFJ_EVK-ND BD9876EFJ_EVK BOARD EVAL BUCK REG BD9676 Datasheet
BD9G101G-CT-ND BD9G101G-TR IC REG BUCK SYNC ADJ 0.5A 8SSOP Datasheet
BD9G101G_EVK-ND BD9G101G_EVK BOARD EVAL FOR BD9G101G Datasheet