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Product Detailed Parameters
- Description：IC REG BUCK 1.8V 1A UCSP35L1
- 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)：2.3V
- Voltage - Input (Max)：5.5V
- Voltage - Output (Min/Fixed)：1.8V
- Voltage - Output (Max)：-
- Current - Output：1A
- Frequency - Switching：4.8MHz ~ 6MHz
- Synchronous Rectifier：Yes
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：6-XFBGA, CSPBGA
- Supplier Device Package：UCSP35L1
- Grade：-
- Qualification：-
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Overview
The BU90104GWZ-E2 is a synchronous buck switching regulator manufactured by ROHM Semiconductor. It integrates a power MOSFET and controller within a UCSP35L1-6 package. The device operates with an input voltage range of 2.3 V to 5.5 V and provides a fixed output voltage of 1.8 V at a maximum output current of 1 A. It features a switch frequency setting up to 5.4 MHz and a typical quiescent current of 45 µA. The component supports operation between -40°C and +85°C and includes shutdown functionality.
Feature Summary
- Integrates a synchronous buck converter with an internal power MOSFET for compact design
- Utilizes constant on-time control architecture for rapid transient response
- Supports low standby power consumption suitable for battery-operated applications
Applications
- Portable consumer electronics requiring low quiescent current
- Battery-powered devices needing efficient step-down regulation
- Systems requiring fast transient response under light load conditions
Procurement Notes
Verify the specific suffix E2 against the manufacturer's latest datasheet to confirm pinout compatibility and RoHS status. Confirm that the UCSP35L1-6 package dimensions match your PCB footprint requirements. Ensure the fixed 1.8 V output aligns with your system voltage rails, as this variant does not offer adjustable output options.
Selection Notes
Select this component when a compact solution with integrated FET is required for 1 A loads. The fixed 1.8 V output limits flexibility compared to adjustable variants. Consider the 5.4 MHz switching frequency for inductor size trade-offs. Verify thermal performance in the target enclosure, as power dissipation depends on input-output voltage differential and load current.
Part Context
This part belongs to ROHM's series of integrated MOSFET DC-DC converters. These ICs are designed for applications demanding high efficiency and small footprint. The series utilizes constant on-time control to maintain stability across varying load conditions. This specific model targets portable electronics where space and power efficiency are critical constraints.
Replacement Considerations
Publicly confirmed substitute part numbers are not available in the provided documentation. Cross-referencing requires consulting official ROHM replacement guides or distributor compatibility matrices.
