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Product Detailed Parameters
- Description：IC REG BUCK ADJ 3A 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)：4.5V
- Voltage - Input (Max)：18V
- Voltage - Output (Min/Fixed)：0.765V
- Voltage - Output (Max)：7V
- Current - Output：3A
- Frequency - Switching：700kHz
- Synchronous Rectifier：Yes
- Operating Temperature：-40°C ~ 85°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 BD9D321EFJ-E2 is a synchronous buck DC-DC converter manufactured by ROHM Semiconductor. It integrates power MOSFETs to deliver a continuous output current of 3 A. The device supports an input voltage range from 4.5 V to 18 V and provides an adjustable output voltage between 765 mV and 7 V. Operating with a fixed switching frequency of 700 kHz, it features a low quiescent current of 15 uA. The IC is housed in an 8-pin HTSOP-J package and operates within a temperature range of -40°C to +85°C.
Feature Summary
- Integrates high-side and low-side power MOSFETs for compact synchronous buck conversion
- Supports wide input voltage range up to 18 V for flexible system design
- Features low standby current consumption to enhance energy efficiency
- Includes shutdown functionality for power management control
Applications
- Industrial equipment power supplies
- Portable battery-powered devices
- General-purpose step-down regulation in embedded systems
Procurement Notes
Verify the specific suffix E2 against the manufacturer's latest datasheet to confirm pinout and electrical characteristics match your design requirements. Ensure compatibility with your PCB footprint, specifically the 8-HTSOP-J package dimensions. Confirm RoHS compliance status if required by your manufacturing standards. Cross-reference the part number with authorized distributors to avoid counterfeit components.
Selection Notes
Select this component when a 3 A output current is required from an input source up to 18 V. The 700 kHz switching frequency allows for smaller external inductors and capacitors compared to lower-frequency alternatives. The adjustable output range starting at 765 mV suits modern digital loads requiring low core voltages. Consider thermal performance in the HTSOP-J package for high-load applications.
Part Context
This part belongs to the BD9D321 series of synchronous buck regulators from ROHM. It is designed as a cost-effective solution for medium-current applications. The series shares architectural similarities with other members like the BD9D320, though specific electrical parameters such as quiescent current may vary between variants. It serves as a standalone regulator without requiring external drivers.
Replacement Considerations
The BD9D320EFJ-E2 is a related variant within the same product family. Verify if the difference in quiescent current (2 uA for BD9D320 vs 15 uA for BD9D321) impacts your application. Both share similar input/output ranges and packaging. No other direct cross-references are confirmed in public documentation.
