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Product Detailed Parameters
- Description：IC REG BUCK ADJ 1A 8SOP
- Series：-
- Mfr：Rohm Semiconductor
- Package：Tape & Reel (TR),Cut Tape (CT)
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：6V
- Voltage - Input (Max)：20V
- Voltage - Output (Min/Fixed)：1.512V
- Voltage - Output (Max)：20V
- Current - Output：1A
- Frequency - Switching：1MHz
- Synchronous Rectifier：No
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：8-SOIC (0.173", 4.40mm Width)
- Supplier Device Package：8-SOP
- Grade：-
- Qualification：-
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Overview
The BD9227F-E2 is a single-channel, non-synchronous buck DC/DC converter IC designed for high-precision DC fan motor speed control. It operates with an input voltage range of 6V to 20V and delivers a maximum output current of 1A. The device features an integrated power MOSFET with an on-resistance of 200mΩ at 20V. It utilizes a fixed switching frequency of 1MHz and supports an adjustable output voltage from 1.512V up to the input level. The component functions within an operating temperature range of -40°C to +85°C and is housed in a compact SOP-8 package measuring 5.0x6.2mm.
Feature Summary
- Enables high-precision linear control of DC fan motor speeds through high-frequency driving capabilities.
Applications
- High-precision DC fan motor speed control
Procurement Notes
Verify the specific suffix E2 to confirm the tape-and-reel packaging format and RoHS compliance status. Confirm that the application does not involve automotive environments, as this standard-grade product is explicitly unsuitable for车载 equipment. Ensure the design accounts for the non-synchronous topology and the absence of internal enable or power-good signals when integrating into the system circuitry.
Selection Notes
Select this component for applications requiring precise analog control of fan rotational speed rather than simple on-off switching. The integrated FET reduces external component count compared to discrete solutions. Consider the 1MHz frequency for balancing efficiency and passive size. Note that it lacks soft-start or advanced protection features like hiccup mode, requiring external circuit management for fault conditions.
Part Context
This part belongs to ROHM's series of power management ICs focused on motor control and DC/DC conversion. It represents a shift from discrete transistor designs to integrated solutions that minimize board space. The SOP-8 package allows for surface-mount integration in compact consumer electronics where thermal management and size constraints are critical factors for cooling system implementation.
Replacement Considerations
Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult official ROHM resources for direct pin-compatible alternatives or functional equivalents within the same product family if supply chain adjustments are necessary.
