BM1Q021FJ-E2

AC DC Converters, Offline Switchers Overview

The BM1Q021FJ-E2 is a quasi-resonant DC-DC converter IC manufactured by ROHM Semiconductor. It operates within an input voltage range of 8.9 V to 26 V and supports a maximum switching frequency of 120 kHz. The device features an external switch MOSFET and current sense resistor configuration, housed in a SOP-J7S package. Key electrical parameters include a minimum operating temperature of -40°C and a maximum of 105°C. It integrates a starter circuit, burst operation for light loads, and multiple protection mechanisms including overcurrent, overvoltage, and thermal shutdown.

AC DC Converters, Offline Switchers Feature Summary

• Quasi-resonant operation enables soft switching to reduce electromagnetic interference (EMI).
• Integrated starter circuit facilitates low standby power consumption and rapid startup.
• Burst mode functionality at light loads further minimizes power dissipation.
• Comprehensive protection suite includes per-cycle overcurrent, output overvoltage, and thermal shutdown.

AC DC Converters, Offline Switchers Applications

• Industrial equipment power supplies
• Appliance systems requiring socket integration
• General AC/DC conversion applications

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix E2 against the manufacturer's latest datasheet to confirm compliance with RoHS directives and material declarations. Ensure the SOP-J7S package dimensions align with your PCB footprint requirements. Confirm that the external MOSFET selection matches the IC's drive capabilities and voltage ratings for optimal performance.

AC DC Converters, Offline Switchers Selection Notes

Select this component when designing AC/DC converters requiring high efficiency under varying load conditions. The external switch design offers flexibility in handling higher power levels compared to integrated solutions. Consider the 120 kHz maximum frequency for balancing component size and switching losses. Ensure adequate thermal management for the external MOSFET as the IC itself does not dissipate significant switching heat.

AC DC Converters, Offline Switchers Part Context

This part belongs to the BM1Q0xxAFJ-LB series of quasi-resonant controllers designed for long-term supply in industrial markets. It differs from PWM-only controllers by utilizing zero-voltage switching techniques to improve efficiency. The family is characterized by its ability to maintain stability across wide input voltage ranges while minimizing acoustic noise through frequency jittering.

AC DC Converters, Offline Switchers Replacement Considerations

Direct substitutes within the same series include BM1Q021AFJ-LB. Verify pin compatibility and electrical specifications before swapping. Alternative families may require redesign of the feedback loop and external component values due to differences in control architecture.