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Product Detailed Parameters
- Description：IC REG BUCK ADJ 4A 8HTSOP-J
- 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)：3.5V
- Voltage - Input (Max)：36V
- Voltage - Output (Min/Fixed)：0.8V
- Voltage - Output (Max)：36V
- Current - Output：4A
- Frequency - Switching：50kHz ~ 600kHz
- Synchronous Rectifier：No
- Operating Temperature：-40°C ~ 125°C (TA)
- Mounting Type：Surface Mount
- Package / Case：8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Supplier Device Package：8-HTSOP-J
- Grade：-
- Qualification：-
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Overview
The BD90640UEFJ-CE2 is a single-channel step-down switching regulator manufactured by ROHM Semiconductor. It features an integrated high-voltage Pch POWER MOSFET and operates within an input voltage range of 3.5 V to 36 V. The device supports a maximum output current of 4 A with an adjustable output voltage from 800 mV to 36 V. Switching frequency is externally configurable via resistors, ranging from 50 kHz to 600 kHz. It includes external synchronization capability, soft start, and overcurrent protection. Qualified under AEC-Q100 Grade 1, it functions reliably between -40°C and +125°C in HTSOP-J8 packaging.
Feature Summary
- Integrates a high-voltage Pch POWER MOSFET for compact system design
- Supports external clock synchronization for noise management
- Provides flexible switching frequency adjustment via external resistors
- Includes built-in soft start and overcurrent protection mechanisms
Applications
- Automotive electronic control units (ECUs)
- Infotainment system power distribution
- ADAS sensor module power supplies
- Industrial control system DC-DC conversion
Procurement Notes
Verify the specific suffix CE2 against the official datasheet to confirm package type and tape/reel specifications. Ensure compatibility with automotive functional safety requirements if deployed in safety-critical systems. Confirm that external component selections align with the specified operating temperature range and current ratings. Cross-reference the part number alias BD90640UEFJ-C for potential documentation variations during sourcing.
Selection Notes
Select this component when a wide input voltage range up to 36 V and high output current near 4 A are required. It is suitable for applications needing external synchronization to mitigate electromagnetic interference. Consider the HTSOP-J8 package constraints for thermal management. Evaluate the need for adjustable switching frequencies versus fixed-frequency alternatives based on passive component size requirements.
Part Context
This part belongs to the BD90640 series of buck converters designed for automotive and industrial environments. It shares architectural similarities with other ROHM integrated FET regulators but distinguishes itself through its specific 4 A current rating and broad input voltage tolerance. The series emphasizes robustness and flexibility in frequency setting for diverse power tree designs.
Replacement Considerations
BD90640EFJ-C is listed as an alias or related variant within the same product family. Verify electrical equivalence and pinout compatibility before substitution. No other direct public substitutes are confirmed in the provided documentation.
