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Product Detailed Parameters
- Description：IC REG BUCK 1.8V 1A 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)：2.7V
- Voltage - Input (Max)：5.5V
- Voltage - Output (Min/Fixed)：1.8V
- Voltage - Output (Max)：-
- Current - Output：1A
- Frequency - Switching：2.2MHz
- Synchronous Rectifier：Yes
- Operating Temperature：-40°C ~ 125°C (TA)
- Mounting Type：Surface Mount
- Package / Case：8-UFDFN Exposed Pad
- Supplier Device Package：VSON008X2020
- Grade：-
- Qualification：-
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Overview
The BD9S111NUX-CE2 is a single synchronous buck DC/DC converter from ROHM Semiconductor, designed for automotive applications. It operates with an input voltage range of 2.7 V to 5.5 V and provides a fixed output voltage of 1.8 V at a maximum current of 1 A. The device features a switching frequency of 2.2 MHz and functions within a temperature range of -40°C to +125°C. It is qualified under AEC-Q100 standards and housed in a compact VSON-8 package.
Feature Summary
- Integrated low on-resistance power MOSFETs for efficient synchronous rectification
- Built-in feedback resistors and phase compensation circuits to minimize external components
- Current mode control architecture enabling high-speed transient response performance
Applications
- Automotive infotainment systems
- Instrument cluster power supplies
- Body electronics modules
Procurement Notes
Verify the specific suffix CE2 against the manufacturer's latest datasheet to confirm pinout and thermal characteristics. Ensure the order quantity aligns with the standard taping packaging requirements specified by ROHM Semiconductor. Cross-reference the AEC-Q100 Grade 1 qualification status if strict automotive functional safety compliance is required for the target application.
Selection Notes
Select this component when a fixed 1.8 V output is required for automotive loads up to 1 A. The integrated design reduces bill of materials compared to adjustable variants. Consider the 2.2 MHz frequency for smaller passive component sizes. Verify that the 2.7 V minimum input voltage meets the system's lowest operating rail conditions.
Part Context
This part belongs to the BD9S series of ROHM Automotive PMICs. It shares the VSON-8 footprint and core topology with other members like the BD9S110NUX-CE2 (1.2 V output) and BD9S100NUX-CE2 (adjustable output). The series is characterized by its small form factor and robust automotive-grade reliability specifications.
Replacement Considerations
The BD9S111NUX-C is listed as an alias for this part number. Direct substitution with other BD9S series devices requires verifying output voltage compatibility, as adjacent models offer different fixed voltages or adjustable ranges.
