BU90004GWZ-E2-EVK-101: 1.8 V @ 1A 2.3 ~ 5.5V in

Summary

The BU90004GWZ-E2-EVK-101 board has been specifically developed to evaluate the BU90004GWZ 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, 1.8V output, and a switching frequency range of 4.8MHz to 6.0MHz. 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.

The BU9000xGWZ series of compact, high-efficiency step-down switching regulators features high-frequency (6MHz) operation and supports a maximum output current of 1.0A (VIN=3.0 to 5.5V), making them ideal for battery-driven portable devices. In addition, automatic PWM/PFM mode and forced PWM mode switching is enabled via MODE pin logic. As a result circuit current is minimized during PFM mode, improving efficiency at light loads.

Specifications

Manufacturer Rohm Semiconductor
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Single Output
Eval Board Part Number BU90004GWZ-E2-EVK-101-ND
Eval Board Supplier Rohm Semiconductor
Eval Board Normally In Stock
Topology Step Down
Outputs and Type 1 Non-Isolated
Voltage Out: Factory Set 1.8 V
Current Out 1 A
Voltage In 2.3 ~ 5.5 V
Efficiency @ Conditions >84%, 5V in, 1.8V @ 200 ~ 550 mA (FPWM Mode)
>80%, 5V in, 1.8V @ 50 ~ 850 mA (PFM/PWM Mode)
Voltage Out Range - Fixed
Features Current Limit (Adj. or Fixed)
Light Load Mode
Over Current Protection
PFM or PWM
Shutdown, Enable, Standby
Soft Start
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 4.8 ~ 6 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 Audio: MP3 Players
Cell Phones
Portable Devices
Tablets
Wearable Devices
Standby Current [Maximum] 1 µA
Quiescent Current [Maximum] 65 µA
Main I.C. Base Part BU90004
Date Created By Author 2015-12
Date Added To Library 2021-07

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