AUTOMOTIVE_Catalog_Ver.2.1

Mot or

High

Voltage

DC/DC CONVERTER

Batteries

In HEVs and EVs, where the engine frequently stops and starts while driving, DC/DC converters are proving to be more

efficient than conventional alternator at supplying power to the engine under all operating conditions. DC/DC converters work

by converting the high battery voltage to 14V DC using a power element and transformer to perform high-frequency switching

and voltage conversion in order to charge the low-voltage battery.

In addition, isolator ICs are required to electrically isolate all signals as well as ground between the low voltage and high

voltage boards in order to prevent possible electrical shock and fire. ROHM is currently developing robust isolator ICs that

feature greater compactness and longer life.

High Voltage Low Voltage

DC/DC CONVERTER Products

(^)
Low Voltage ECU
Low Voltage Battery
Isolates the high and low-
voltage sides, enabling fast,
safe signal transmission.
Isolators BM67220FV-CBM67221FV-C
SSOP-B20W
Monitors the temperature of
the IGBT, SiC and Power
MOSFET.
Temperature Monitor BM66002FV-C
SSOP-B20W
Sends voltage data to the MCU to
protect the power MOSFET and
other components.
High Voltage Monitor BM
SSOP-B20W
Integrates isolation and gate
driver functions into a compact
SSOP-B20W package.
Isolated Gate Driver BM6104FV-C
SSOP-B20W
Isolated boost-buck power
supply IC that provides
regulated power to the MCU.
Power Supply IC BD9031FV-C
5W rated power guaranteed in
the ultra-low-resistance region
!%"*ᄑ"
High power Ultra Low Ohmic
Chip Shunt Resistors PSR Series
Memory
Operational Amplifier
Comparator
Voltage Detector
(Reset ICs)
P.
P.
P.
Memory
P.31 P.32 P.
P.31 P.23 P.
SSOP-B
To an auxiliary battery,
car navigation system,
air conditioning,
ECU,and so on.
HV Battery
LV
Battery
14V output
Temperature
Monitor IC
High Voltage
monitor
LV Power
Supply
Isolated
Gate Driver
Isolated
Gate Driver
Isolated
Gate Driver
Isolated
Gate Driver
MCU
Driver
MOSFET
MOSFET
MOSFET
MOSFET
MOSFET
MOSFET
Low Ohmic
Resistor
Memory Op.Amps
Comparators
Voltage Detectors
(Reset IC)
PSR