BU90003GWZ-E2

Overview

The BU90003GWZ-E2 is a step-down switching regulator manufactured by ROHM Semiconductor, classified under PMIC - Power Management ICs. It utilizes a Buck topology to provide a fixed output voltage of 1.2 V with a maximum output current of 1 A. The device operates within an input voltage range of 2.3 V to 5.5 V and features a switch frequency between 3.6 MHz and 4.4 MHz. Quiescent current is specified at 5.2 mA. It supports a shutdown function and functions reliably across an operating temperature range from -40°C to +85°C. The component is housed in a UCSP35L1-6 surface-mount package.

Feature Summary

• Integrates a power MOSFET within the buck converter architecture for compact design
• Includes a dedicated shutdown pin for active power management control
• Operates as a single-output step-down switching regulator

Applications

• Portable electronic devices requiring efficient voltage regulation
• Battery-powered systems utilizing 2.3V to 5.5V input sources
• Embedded circuits needing stable 1.2V logic supply rails

Procurement Notes

This component is officially designated as End-of-Life (EOL) by the manufacturer. Production has ceased, and the part is no longer available for new manufacturing orders. Verification of availability should focus on remaining stock from authorized distributors or secondary market suppliers rather than direct procurement from ROHM Semiconductor. Ensure that any sourced units are verified for authenticity due to the discontinued status.

Selection Notes

Select this specific variant when a fixed 1.2 V output is required for applications compatible with the BU90003 series. Consider alternative part numbers within the same family if different fixed output voltages such as 1.0 V, 1.3 V, or 3.3 V are needed, as these share identical packaging and electrical characteristics except for the output setting. Verify compatibility with existing PCB footprints using the UCSP35L1-6 package dimensions.

Part Context

The BU90003GWZ-E2 belongs to the BU90003GWZ series of switching regulators designed for space-constrained applications. It shares the UCSP35L1-6 package form factor with other members like the BU90009GWZ-E2 and BU90007GWZ-E2. The series is characterized by integrated power switches and fixed output options, targeting efficiency in small form-factor electronics.

Replacement Considerations

As the part is discontinued, direct substitutes must be identified based on functional equivalence. Potential alternatives include other BU9000xGWZ-E2 variants with matching 1A current ratings and similar input ranges, provided the fixed output voltage matches the system requirement. Cross-reference with newer generation ROHM regulators if pin-to-pin compatibility is not strictly required.