AC/DC Converters ICs (PWM / Quasi-Resonant)
PWM / Quasi-Resonant

AC/DC Converters ICs (PWM / Quasi-Resonant)

ROHM's large current integrated FET type switching regulators are compatible with virtually all switching power supply applications. Features includes a wide input voltage range, flexible operating frequency, and low power consumption.

The broad lineup includes boost (step-up) regulators, buck (step-down) regulators, buck-boost (step-up/step-down) regulators with integrated FET, and negative voltage types. Combining our class-leading power management AC/DC converters with compact switches allows users to save valuable space and reduce the number of components required.

Evaluation Boards

There are Evaluation Boards for various power bands and topologies.

ROHM AC/DC Designer

ROHM AC/DC Designer easily supports circuit designs. It searches items according to the conditions in the Parameter. When the D button is clicked, it draws out the reference circuit, and automatically designs the specification of the Trans.

Parameters (Target Value)
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Parametric Search


Supporting Information




The BM2P Series was designed for use in AC adapters, home appliances, office equipment, and the like. A low ON resistance super junction MOSFET is built in for significantly improved efficiency, ensuring compliance with the latest Energy Star* standard. Delivers an optimized power supply system for sets of all types.

*:An international environmental leveling system for energy saving in OA equipment

Non-Isolation Buck Converter (COMPACT Series)

Non-Isolation Buck Converter ( Middle Power COMPACT Series)

Evaluation Board Image IC Output Power Output Voltage Maximum Load Current Purchase
BM2P161W-EVK-001 BM2P161W 10.0W 16V 0.6A Distribution Inventory
BM2P121X-EVK-001 BM2P121X-Z 9W 12V 0.75A Distribution Inventory
BM2P141X-EVK-001 BM2P141X-Z 10W 12V 0.83A Distribution Inventory
BM2P151X-EVK-001 BM2P151X-Z 12W 15V 0.8A Distribution Inventory

Non-Isolation Buck Converter ( Low~Middle Power High Precision Series )

Evaluation Board Image IC Output Power Output Voltage Maximum Load Current Purchase
BM2P0161-EVK-001 BM2P0161-Z 7.5W 15V 0.5A Distribution Inventory
BM2P0161-EVK-002 BM2P0161-Z 6.0W 12V 0.5A Distribution Inventory
BM2P016-EVK-001 BM2P016 15W 15V 1A Distribution Inventory
BM2P016-EVK-002 BM2P016 12W 12V 1A Distribution Inventory

Isolation Fly-back Converter

Using 1700V SiC MOSFET

Evaluation Board Image IC Output Power Output Voltage Maximum Load Current Purchase
BD7682FJ-LB-EVK-402 BD7682FJ-LB 24W 24V 1A Distribution Inventory
BM2SCQ123T-EVK-001 BM2SCQ123T-LBZ 48W 24V 2A Distribution Inventory
BM2SC123FP2-EVK-001 BM2SC123FP2-LBZ 48W 24V 2A Distribution Inventory


Evaluation Board Image IC Output Power Output Voltage Maximum Load Current Purchase
BD7692FJ-EKV-001 BD7692FJ 200W 400V 0.5A Distribution Inventory

Feature 1 : Complies with the latest international standards for efficiency

Class-leading efficiency

For 25W adapters, simply replacing the IC itself will boost efficiency to over 87% (compared with sub-87% with conventional products). This can be increased to over 90% by optimizing the circuit (including selecting the right peripheral components). As a result, the ICs easily pass the new EnergyStar 6 requirements for efficiency.

Significantly lower standby power consumption

Power consumption during standby with a 25W adapter is less than 20mW at 100VAC and less than 30mW at 230VAC - well below the 100mW requirement set by the Energy Star 6 standard. And further improvements are possible through circuit optimization.

Feature 2 : Compact surface mount package added to the lineup

With planar-type MOSFETs commonly used in AC/DC applications, miniaturization is typically difficult due to problems associated with heat dissipation. In contrast, adopting a super junction MOSFET allows for a more compact IC design, including a small surface mount SOP8 package to complement the standard DIP7 type. The SOP8 form factor reduces mounting area by 47% over conventional models.


・PWM Current Mode method
     (PWM frequency: 65kHz, with built-in hopping function)

・Burst operation during light loads / Frequency reduction function

・650V startup circuit and switching SJ MOSFET built-in

Multiple protection functions
     - Thermal shut down
     - Source pin open/short protection
     - Secondary overcurrent protection (64ms timer auto restore)

High-Power Insertion Type
(BM2Pxxx Series)
DIP7 Package
AC/DC Output Power Protection Functions MOSFET
ON Resistance
Type Name
8W Class LATCH 8.5Ω (typ.) BM2P091
Auto Restart BM2P092
  Auto Restart BM2P094
13W Class LATCH 4.0Ω (typ.) BM2P051
Auto Restart BM2P052
  Auto Restart BM2P054
19W Class LATCH 2.4Ω (typ.) BM2P031
Auto Restart BM2P032
  Auto Restart BM2P034
25W Class LATCH 1.4Ω (typ.) BM2P011
Auto Restart BM2P012
  Auto Restart BM2P014
Compact Surface-Mount Type
(BM2PxxxF Series)
SOP8 Package
AC/DC Output Power Protection Functions MOSFET
ON Resistance
Type Name
5W Class LATCH 8.5Ω (typ.) BM2P091F
Auto Restart BM2P092F
  Auto Restart BM2P094F
8W Class LATCH 4.0Ω (typ.) BM2P051F
Auto Restart BM2P052F
  Auto Restart BM2P054F

※1 BR:Brown in/out voltage protection function
※2 Vcc pin over-/under-voltage protection function

Related Information

New Product Bulletin

ROHM cultivates cutting-edge proprietary technologies to develop products and solutions optimized to market needs.