4CH Internal Power MOSFET System Switching Regulator - BD9866GUL

BD9866GUL is a 4ch DC/DC converter IC composed of Buck converter 3-channels and Buck-Boost converter 1-channel.Including power MOSFET of all channels reduces the number of peripheral devices. Each channel is controlled individually, that enables to reduce power consumption of not working channel.

* This product is a STANDARD grade product and not recommend for on-vehicle devices.
Part number
Unit Quantity
Minimum Package Quantity
Packing Type
BD9866GUL-E2 Active VCSP50L3 2500 2500 Taping Yes
ch 4
Vin1(Min.)[V] 4.0
Vin1(Max.)[V] 14.0
SW frequency(Max.)[MHz] 1.0
Operating Temperature (Min.)[°C] -25
Operating Temperature (Max.)[°C] 85
  • 1) Includes Buck converter (CH1, 2 and 4), and Buck-Boost converter (CH3), total 4 channels included.
    2) Includes Power MOSFET for all channels.
    3) Includes Over Current Protection (OCP) for all channels.
    4) Includes Short Circuit Protection (SCP.)
    5) Includes Undervoltage Lock Out (UVLO.)
    6) Includes Thermal Shut Down (TSD.)
    7) Includes Power Good(PG)
    8) External synchronous oscillation
    9) Each channel can be turn on/off individually.
    10) Contains internal compensation for all channels.
    11) Operation frequency of 1MHz.
    9) Includes cut off output voltage circuit during over current(timer latch type).
    10) Includes back-gate control for CH1 with soft start function.
    11) Select initial value by VOSEL2,3,4 terminal
    12) Includes Load SW which input are CH1 output.
Other New/Updated Products Relating to Power Management
PART NUMBER Product Name Package Datasheet Distribution Inventory
BD9634GU Switching Regulator ICs with Built-in FET (5V) VCSP85H4   inquiry
BD8355MWV Power Management IC for DSC/DVCs UQFN056V7070   inquiry
BD9355MWV Power Management IC for DSC/DVCs UQFN036V5050   inquiry
BD9639MWV Power Management IC for DSC/DVCs UQFN056V7070   inquiry
BD9757MWV Power Management IC for DSC/DVCs UQFN044V6060   inquiry
BD9865MWV Power Management IC for DSC/DVCs UQFN040V5050 - Buy Sample
New Products:
Technical Data
Thermal Resistance

The definition and how to use thermal resistance and thermal characterization parameter of packages for ROHM’s integrated circuit are described in this application note.