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Product Detailed Parameters
- Description：IC REG BUCK 1.175V 1.5A 8VSON
- Series：-
- Mfr：Rohm Semiconductor
- Package：Tape & Reel (TR),Cut Tape (CT)
- Function：Step-Down
- Output Configuration：Positive
- Topology：Buck
- Output Type：Fixed
- Number of Outputs：1
- Voltage - Input (Min)：2.3V
- Voltage - Input (Max)：5.5V
- Voltage - Output (Min/Fixed)：1.175V
- Voltage - Output (Max)：-
- Current - Output：1.5A
- Frequency - Switching：1MHz
- Synchronous Rectifier：Yes
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：8-UFDFN Exposed Pad
- Supplier Device Package：VSON008X2030
- Grade：-
- Qualification：-
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Overview
The BU90028NUX-TR is a synchronous buck switching regulator with an integrated FET, manufactured by ROHM Semiconductor. It operates within an input voltage range of 2.3V to 5.5V and provides a fixed output voltage of 1.175V. The device supports a maximum output current of 1.5A and features a switch frequency setting up to 1MHz. It includes enable functionality but lacks a power good signal. The component is housed in a VSON008X2030 package measuring 2.0x3.0mm with a thickness of 0.6mm. It functions across an operating temperature range from -40°C to 85°C.
Feature Summary
- Integrated FET topology for synchronous buck conversion
- Automatic PFM/PWM operation for light load efficiency
- Internal soft start and under voltage lockout protection
- Over current protection and thermal shutdown mechanisms
Applications
- Portable electronic devices requiring efficient step-down regulation
- Battery-powered systems needing low quiescent current management
- Embedded controllers utilizing the 1.175V output rail
- Automotive infotainment or instrument clusters within specified voltage limits
Procurement Notes
Verify the specific suffix TR indicates tape and reel packaging when ordering. Confirm RoHS compliance status as listed in official documentation. Ensure the VSON008X2030 package dimensions match your PCB footprint requirements. Check for any automotive qualification standards if deploying in vehicle environments. Validate that the fixed 1.175V output aligns with your system design needs.
Selection Notes
Select this component when a compact solution is required for inputs between 2.3V and 5.5V. The integrated FET reduces external component count compared to controller-only options. Consider the 1.5A current limit for moderate power applications. The absence of a power good signal may necessitate alternative monitoring methods. Evaluate the fixed output voltage against load requirements before finalizing the design.
Part Context
This part belongs to ROHM's series of high-efficiency buck regulators with integrated power switches. It targets applications demanding small form factors and simplified design processes. The VSON package allows for dense PCB layouts. It complements other ROHM PMIC offerings by providing a standalone regulated supply rail.
Replacement Considerations
Check for BU90023NUX-TR if a slightly different output voltage or feature set is acceptable. Verify pin compatibility and electrical specifications before substitution. Consult official cross-reference guides for confirmed alternatives.
