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Product Detailed Parameters
- Description：IC REG BUCK ADJ 4A HRP7
- 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)：7V
- Voltage - Input (Max)：35V
- Voltage - Output (Min/Fixed)：1V
- Voltage - Output (Max)：35V
- Current - Output：4A
- Frequency - Switching：50kHz ~ 500kHz
- Synchronous Rectifier：No
- Operating Temperature：-40°C ~ 125°C (TA)
- Mounting Type：Surface Mount
- Package / Case：HRP-7 (7 Leads + Tab)
- Supplier Device Package：HRP7
- Grade：-
- Qualification：-
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Overview
The BD9781HFP-TR is a flexible step-down switching regulator with an integrated power MOSFET manufactured by Rohm Semiconductor. It operates with an input voltage range of 4.5V to 36V and provides a maximum output current of 2A. The device features an adjustable output voltage from 0.8V to VIN, allowing for versatile design configurations. It supports external frequency setting between 50kHz and 500kHz to optimize efficiency and component size. The IC includes comprehensive protection mechanisms such as overcurrent, overvoltage, and thermal shutdown to ensure reliable operation in various industrial and consumer applications.
Feature Summary
- Integrated power MOSFET reduces external component count and board space
- Adjustable output voltage allows customization for specific circuit requirements
- External frequency setting enables optimization of transient response and efficiency
- Built-in protection circuits safeguard against fault conditions
Applications
- Industrial control systems requiring stable DC power
- Consumer electronics with variable voltage needs
- Embedded systems utilizing buck conversion topology
- General-purpose power supply designs
Procurement Notes
Verify the exact suffix and package type when ordering, as variations may exist. Confirm RoHS compliance status with the supplier prior to purchase. Check for end-of-life or obsolescence notices on the manufacturer's website. Ensure the distributor is authorized to prevent counterfeit components. Review the latest datasheet revision for any updates to electrical characteristics or pin assignments before finalizing procurement.
Selection Notes
Select this component when a compact, high-efficiency buck converter with integrated switching elements is required. Consider the input voltage range and maximum load current to ensure adequate headroom. Evaluate the need for adjustable output versus fixed voltage options within the series. Assess thermal management requirements based on the expected power dissipation and ambient temperature conditions. Compare switching frequency options to balance electromagnetic interference and passive component sizes.
Part Context
This part belongs to Rohm's BD9x series of integrated MOSFET DC-DC buck converters. These devices are designed for applications demanding high efficiency and fast transient response. The series utilizes constant on-time control methods to maintain stability under varying load conditions. They are commonly used in portable and battery-powered devices where low standby power consumption is critical.
Replacement Considerations
Check for direct pin-compatible replacements within the BD9x family. Verify that alternative parts meet the same input/output voltage and current specifications. Ensure thermal performance and protection features are comparable. Consult the manufacturer's cross-reference guide for validated substitutes.
