BM2P121X-Z

Overview

The BM2P121X-Z is a non-isolated PWM DC/DC converter IC with an integrated switching MOSFET, designed for AC/DC conversion in plug-in applications. It operates within an input voltage range of 9.5 V to 12.96 V and features a fixed switching frequency of 65 kHz. The device utilizes current mode control for superior bandwidth and transient response, incorporating per-cycle current limiting. Key electrical parameters include a maximum drain voltage of 650 V, a quiescent operating current of 850 uA, and a thermal shutdown threshold. It supports operation from -40°C to +105°C and is housed in a DIP-7 package.

Feature Summary

• Integrates a 650 V super junction MOSFET and startup circuit to facilitate low-power design.
• Employs PWM current mode method with per-cycle current limitation for enhanced transient performance.
• Includes frequency hopping functionality to assist in achieving low electromagnetic interference.
• Features burst operation at light loads to maintain high efficiency under reduced power conditions.

Applications

• Power supply systems for consumer electronics utilizing plug-in adapters
• Non-isolated AC/DC converter designs for general-purpose electronic devices
• Compact power supply units requiring low standby power consumption

Procurement Notes

Verify the specific suffix variant against official ROHM documentation to ensure compatibility with required input voltage ranges and packaging configurations. Confirm that the application environment remains within the specified industrial temperature limits and does not involve automotive usage, as this component is designated for standard-grade applications only. Cross-reference datasheet revision levels to validate pinout and electrical characteristics prior to integration.

Selection Notes

Select this component for designs requiring a compact, non-isolated solution with integrated power switching capabilities. The fixed 65 kHz frequency simplifies filter design while the built-in protections reduce external component count. Consider the DIP-7 package constraints for through-hole assembly requirements. Evaluate the 850 uA operating current against system standby power targets to ensure compliance with energy efficiency standards for plug-in equipment.

Part Context

This part belongs to the BM2P121 series of AC/DC converters from ROHM Semiconductor, which are optimized for small form-factor power supplies. The series emphasizes miniaturization through integrated current detection resistors and high-voltage MOSFETs. These ICs target markets demanding efficient, cost-effective power solutions for appliances and accessories that connect directly to mains outlets via plugs.

Replacement Considerations

BM2P121W-Z: Similar DIP-7 package and functional architecture; verify input voltage specifications match design requirements.

FAQ

Does the BM2P121X-Z support adjustable output voltage?

No, the BM2P121X-Z is configured as a fixed-output PWM DC/DC converter IC, unlike the BM2P121XH-Z variant which offers adjustable output capabilities.

What protection features are included in this IC?

The IC includes Vcc UVLO (Under Voltage Lock Out), Vcc OVP (Over Voltage Protection) with auto-restart, per-cycle overcurrent detection, and thermal shutdown functions.