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ROHM BD9F500QUZ/BD9G500EFJ-LA Buck DC/DC Converters

Featuring build-in low on-resistance power MOSFETs

Geared for versatility, the ROHM BD9F500QUZ/BD9G500EFJ-LA Buck DC/DC Converters achieve high power density in single and multi-channel configurations, delivering industry-leading performance. This allows designers to develop unique and differentiated power designs using a small footprint on the PCB.

BD9F500QUZ Single Synchronous Buck DC/DC Converter (New)

Nano Pulse Control™ 4.5 V to 36 V Input, 5 A Integrated MOSFET

The ROHM BD9F500QUZ is a synchronous buck DC/DC converter with built-in low on-resistance power MOSFETs. It is capable of providing current up to 5A and features fast transient response due to its Constant On-Time control system. The Light Load Mode control improves efficiency in light-load conditions. The BD9F500QUZ is ideal for reducing standby power consumption of equipment. Power Good function makes it possible for system to control sequence. The DC/DC converter achieves the high power density and offer a small footprint on the PCB by employing a small package size.


BD9F500QUZ Typical Application Circuit

ROHM — BD9F500QUZ Typical Application Circuit


BD9F500QUZ Block Diagram

ROHM — BD9F500QUZ Functional Block Diagram


BD9F500QUZ Specifications

Grade Standard
ch 1
Integrated FET / Controller Integrated FET
Topology Buck
Synchronous / Nonsynchronous Synchronous
Vin1(Min.)[V] 4.5
Vin1(Max.)[V] 36
Vout1(Min.)[V] 0.6
Vout1(Max.)[V] 14
Iout1(Max.)[A] 5
SW frequency(Max.)[MHz] 2.2
Light Load mode Yes
EN Yes
Operating Temperature (Min.)[°C] -40
Operating Temperature (Max.)[°C] 85


BD9F500QUZ Features

  • Single Synchronous Buck DC/DC Converter
  • Constant On-Time Control
  • Light Load Mode Control
  • Adjustable Soft Start
  • Power Good Output
  • Nano Pulse Control™
  • Output Capacitor Discharge Function
  • Over Voltage Protection (OVP)
  • Over Current Protection (OCP)
  • Short Circuit Protection (SCP)
  • Thermal Shutdown Protection (TSD)
  • Under Voltage Lockout Protection (UVLO)
  • VMMP16LZ3030 Package, Backside Heat Dissipation, 0.5 mm Pitch

BD9F500QUZ Applications

  • Step-down Power Supply for SoC, FPGA, Microprocessor
  • Printer (MFP / LBP / IJP / POS)
  • OA Equipment
  • Laptop PC
  • USB Type-C Applications



ROHM BD9G500EFJ-LA Single Buck DC/DC Converter (New)

7V to 76V Input, 5A Integrated High-Side MOSFET

The ROHM BD9G500EFJ-LA is buck DC/DC converter with built-in low on-resistance and a High-Side power MOSFET. Capable of providing current of up to 5A, the BD9G500EFJ-LA features a current mode architecture that provides fast transient response and simple phase compensation setup. The operating frequency is adjustable from 100kHz to 650kHz. The BD9G500EFJ-LA guarantees long time support in industrial markets.


BD9G500EFJ-LA Typical Application Circuit

ROHM — BD9G500EFJ-LA Typical Application Circuit


BD9G500EFJ-LA Block Diagram

ROHM — BD9G500EFJ-LA Functional Block Diagram

BD9G500EFJ-LA Specifications

Grade Industrial
ch 1
Integrated FET / Controller Integrated FET
Topology Buck
Synchronous / Nonsynchronous Non-synchronous
Vin1(Min.)[V] 7
Vin1(Max.)[V] 76
Vout1(Min.)[V] 1
Vout1(Max.)[V] 68.4
Iout1(Max.)[A] 5
SW frequency(Max.)[MHz] 0.65
Light Load mode No
EN Yes
Operating Temperature (Min.)[°C] -40
Operating Temperature (Max.)[°C] 125

BD9G500EFJ-LA Features

  • Long Time Support Product for Industrial Applications.
  • Wide Input Voltage Range
  • Integrated High-Side MOSFET
  • Current Mode Control
  • Adjustable Frequency
  • Soft Start Function
  • Over Current Protection (OCP)
  • Under Voltage Lockout (UVLO)
  • Thermal Shutdown Protection (TSD)
  • Over Voltage Protection (OVP)
  • HTSOP-J8 package

BD9G500EFJ-LA Applications

  • Industrial Equipment
  • Power Supply for FA’s Industrial Device
  • Communications Power Systems