BU90003GWZ-E2-EVK-101: 1.2V @ 1A, 2.3 ~ 5.5 Vin


This evaluation board has been developed specifically developed to evaluate the BU90003GWZ synchronous buck DC/DC converter with integrated 250mΩ high-side Pch and 220mΩ low-side Nch MOSFETs.

Features include an input voltage range of 2.3V to 5.5V, 1.2V output, and a switching frequency range of 3.6MHz to 4.4MHz. Multiple protection functions are also built in, including a soft start circuit that prevents inrush current during startup, UVLO (Under Voltage Lock Out), TSD (Thermal Shutdown), and OCP (Over Current Protection).

An EN pin allows for simple ON/OFF control to reduce standby current consumption, while a MODE pin enables selection between fixed PWM operation or automatic PFM/PWM switching to improve efficiency during light loads.


Manufacturer Rohm Semiconductor
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Single Output
Eval Board Part Number BU90003GWZ-E2-EVK-101-ND
Eval Board Supplier Rohm Semiconductor
Eval Board -
Topology Step Down
Outputs and Type 1 Non-Isolated
Voltage Out: Factory Set 1.2 V
Current Out 1 A
Voltage In 2.3 ~ 5.5 V
Efficiency @ Conditions >75%, 5V in, 1.2V @ 25 ~ 800 mA
Voltage Out Range - Fixed
Features Light Load Mode
Over Current Protection
Shutdown, Enable, Standby
Soft Start
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 3.6 ~ 4.4 MHz
Standby Current [Typical] 0 µA
Quiescent Current [Typical] 45 µA
Component Count + Extras 6 + 8
Internal Switch Yes
Design Author Rohm
Application / Target Market Portable Devices
USB Powered Devices
Standby Current [Maximum] 1 µA
Quiescent Current [Maximum] 65 µA
Main I.C. Base Part BU90003GWZ
Date Created By Author 2015-12
Date Added To Library 2019-03

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