4CH Internal Power MOSFET System Switching Regulator

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.

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Product Detail

Part Number | BD9866GUL-E2
Status | Recommended
Package | VCSP50L3
Unit Quantity | 2500
Minimum Package Quantity | 2500
Packing Type | Taping
RoHS | Yes








SW frequency(Max.)[MHz]


Operating Temperature (Min.)[°C]


Operating Temperature (Max.)[°C]



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.

Design Resources



White Paper

  • ISO 26262: Functional Safety Standard for Modern Road Vehicles
  • Enhancing Efficiency By Reducing Converter Stages & RON In Power Management ICs

Technical Articles

Schematic Design & Verification

  • Importance of Probe Calibration When Measuring Power: Deskew
  • Impedance Characteristics of Bypass Capacitor

Thermal Design

  • What Is Thermal Design
  • Method for Calculating Junction Temperature from Transient Thermal Resistance Data
  • Thermal Resistance

Packaging & Quality

Package Information

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Manufacturing Data

  • Factory Information

Environmental Data

  • Compliance with the ELV directive
  • REACH SVHC Non-use Declaration
  • RoHS Comission Delegated Directive

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  • The Export Control Order
  • Export Administration Regulations(EAR)