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Product Detailed Parameters
- Description：IC REG BUCK 1V 3A 8HTSOP-J
- 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)：5V
- Voltage - Input (Max)：14V
- Voltage - Output (Min/Fixed)：1V
- Voltage - Output (Max)：-
- Current - Output：3A
- Frequency - Switching：750kHz
- 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 BD9859EFJ-E2 is a synchronous buck switching regulator IC from ROHM Semiconductor, designed for secondary-side power supply applications. It integrates a high-voltage N-channel MOSFET with a controller in an HTSOP-J8 package. The device operates with an input voltage range of 5 V to 14 V and delivers a maximum output current of 3 A. It supports adjustable output voltages from 1 V to 9.8 V using a fixed feedback reference of 1.0 V ±1.0%. The internal switch frequency is set at 750 kHz, enabling the use of small external inductors and capacitors. It features current-mode control for fast transient response and includes protection circuits for overcurrent, thermal shutdown, and low-input malfunction prevention.
Feature Summary
- Integrates a 15 V withstand voltage N-channel FET switch with the controller in a compact package.
- Utilizes current-mode control architecture to ensure rapid load transient response.
- Includes comprehensive protection mechanisms such as overcurrent protection, thermal shutdown, and under-voltage lockout.
- Supports external ON/OFF control via an EN terminal with typical standby current of 0 μA.
Applications
- Secondary-side power supplies for consumer electronics
- Step-down conversion from 9 V or 12 V fixed rails to 1.2 V, 1.8 V, 3.3 V, or 5 V logic levels
- Portable devices requiring efficient power management with minimal external component count
Procurement Notes
Verify the specific suffix E2 against the manufacturer's latest datasheet to confirm pin compatibility and electrical specifications. Ensure the ordering code matches the required tape-and-reel quantity of 2500 units. Confirm RoHS compliance status through official documentation before finalizing procurement orders.
Selection Notes
Select this component when designing systems requiring a 3 A buck converter with a 5 V to 14 V input range. The 750 kHz switching frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the HTSOP-J8 package size constraints and thermal requirements for the intended application environment.
Part Context
This part belongs to the BD9859EFJ series of integrated MOSFET DC-DC buck converters. These devices are characterized by their constant on-time control method, which provides fast transient response and low light-load consumption. The series is targeted at applications needing simple phase compensation and high efficiency in a small footprint.
Replacement Considerations
Publicly confirmed substitute part numbers are not available in the provided source material. Consult the manufacturer's official replacement guide or datasheet revision history for qualified alternatives.
