BU90004GWZ-E2

$1.27

Description：IC REG BUCK 1.8V 1A 6WLCSP
Series：-
Mfr：Rohm Semiconductor
Package：Tape & Reel (TR),Cut Tape (CT)

SKU:662f26384bc2 Category: Voltage Regulators - DC DC Switching Regulators Brand: Rohm Semiconductor

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Product introduction

Product Detailed Parameters

Description：IC REG BUCK 1.8V 1A 6WLCSP
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：5.4MHz
Synchronous Rectifier：Yes
Operating Temperature：-40°C ~ 85°C (TA)
Mounting Type：Surface Mount
Package / Case：6-XFBGA, WLCSP
Supplier Device Package：6-WLCSP
Grade：-
Qualification：-

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BU90004GWZ-E2

Overview

The BU90004GWZ-E2 is a high-efficiency buck switching regulator with an integrated FET, manufactured by ROHM Semiconductor. It provides a fixed 1.8V output at up to 1A load current. The device operates from a 2.3V to 5.5V input supply and supports switching frequencies between 4.8MHz and 6MHz. It features automatic PFM/PWM operation for light loads, forced PWM mode, internal soft start, and under-voltage lockout. The component is housed in a UCSP35L1-6 package (0.4x0.4mm) and functions within a temperature range of -40°C to +85°C.

Feature Summary

Integrates power MOSFET and controller in a compact synchronous buck topology
Supports automatic transition between PFM and PWM modes for optimized efficiency
Includes internal soft start and under-voltage lockout protection mechanisms

Applications

Portable electronic devices requiring efficient step-down regulation
Battery-powered systems utilizing single-cell lithium-ion inputs
Embedded circuits needing compact power management solutions

Procurement Notes

Verify the specific suffix E2 against official ROHM documentation to confirm package type and tape-and-reel specifications. Confirm RoHS compliance status directly with the manufacturer or authorized distributors. Ensure the ordering code matches the required UCSP35L1-6 package dimensions. Check for any end-of-life notices or obsolescence warnings prior to finalizing procurement plans.

Selection Notes

Select this component when a fixed 1.8V output is required from a 2.3V to 5.5V source. It is suitable for applications prioritizing small footprint due to the 0.4x0.4mm package size. Choose this part if automatic light-load efficiency improvement via PFM/PWM switching is necessary. Ensure the design accommodates the specified operating temperature range of -40°C to +85°C.

Part Context

This part belongs to the BU90004 series of high-efficiency buck regulators. It is designed for space-constrained portable electronics. The series emphasizes integration of power switches to reduce external component count. It serves as a power management solution for low-voltage digital logic and peripheral circuits.