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Product Detailed Parameters
- Description：IC REG BUCK ADJ 800MA 8HSON
- Series：-
- Mfr：Rohm Semiconductor
- Package：Tape & Reel (TR),Tape & Reel (TR),Cut Tape (CT)
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Adjustable
- Number of Outputs：1
- Voltage - Input (Min)：2.7V
- Voltage - Input (Max)：4.5V
- Voltage - Output (Min/Fixed)：1V
- Voltage - Output (Max)：1.5V
- Current - Output：800mA
- Frequency - Switching：1MHz
- Synchronous Rectifier：Yes
- Operating Temperature：-25°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：8-PowerUDFN
- Supplier Device Package：8-HSON
- Grade：-
- Qualification：-
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Overview
The BD9120HFN-TR is a synchronous buck switching regulator IC manufactured by ROHM Semiconductor. It features an integrated power MOSFET and operates within an input voltage range of 2.7V to 4.5V. The device provides a single adjustable output channel capable of delivering up to 800mA of current, with the output voltage adjustable down to 1V. Packaged in an 8-pin HSON (PowerUDFN) format, it utilizes a constant on-time control method for fast transient response. This component is designated as obsolete and not recommended for new designs.
Feature Summary
- Integrates internal power MOSFETs for compact design
- Employs constant on-time control for rapid transient response
- Supports low standby power consumption at light loads
Applications
- Portable electronic devices requiring low standby power
- Battery-powered systems utilizing 3.7V nominal sources
- Embedded applications needing compact DC-DC conversion
Procurement Notes
Verify component obsolescence status before procurement planning. The BD9120HFN-TR is officially marked as not recommended for new designs. Sourcing may be limited to existing stock or secondary markets. Confirm package integrity and authenticity through authorized channels due to end-of-life status.
Selection Notes
Select this component only for maintenance or legacy system repairs where the original design specifies this exact part. Due to its obsolete status, alternative solutions should be evaluated for new projects. Ensure input voltage requirements align with the 2.7V to 4.5V operational range and that the 800mA load capacity meets circuit demands.
Part Context
This part belongs to the BD9x series of integrated MOSFET DC-DC buck converters from ROHM. These regulators are designed for high efficiency and small footprint applications. The series typically offers current ranges from 1A to 6A, but this specific model is rated for 800mA. It falls under the PMIC category, specifically switching voltage regulators.
Replacement Considerations
No direct public substitute part numbers are confirmed for this obsolete component. Engineers must perform full electrical and thermal re-validation when selecting any alternative buck converter. Check pin compatibility and control loop stability if substituting.
