Flexible Step-Down Switching Regulators

Step-down switching regulators with integrated MOSFETs from ROHM

Image of 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.

BD9328EFJ and BD9329AEFJ Features BD9G101G 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)
  • 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)

Flexible Step-Down Switching Regulators

ImageManufacturer Part NumberDescriptionAvailable Quantity
BD9G101G-TR datasheet linkIC REG BUCK ADJ 0.5A 6SSOPBD9G101G-TRIC REG BUCK ADJ 0.5A 6SSOP58714 - Immediate
BD9G101G-TR product page link
BD9328EFJ-E2 datasheet linkIC REG BUCK ADJ 2A SYNC 8HTSOPBD9328EFJ-E2IC REG BUCK ADJ 2A SYNC 8HTSOP4653 - Immediate
BD9328EFJ-E2 product page link
BD9329AEFJ_EVK product page link
BD9329AEFJ-E2 datasheet linkIC REG BUCK ADJ 3A SYNC 8HTSOPBD9329AEFJ-E2IC REG BUCK ADJ 3A SYNC 8HTSOP0BD9329AEFJ-E2 product page link
BD9328EFJ_EVK datasheet linkBOARD EVAL BUCK REG BD9328BD9328EFJ_EVKBOARD EVAL BUCK REG BD93284 - Immediate
BD9328EFJ_EVK product page link
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Published: 2013-03-14