Design contains obsolete parts

BD9673AEFJ_EVK:

Summary

This application note will provide the steps necessary to operate and evaluate ROHM’s step-down switching regulator using the BD9673EFJ/BD9876EFJ evaluation boards. Component selection, board layout recommendations, operation procedures and application data is provided.

This evaluation board has been developed for ROHM’s step-down switching regulator customers evaluating BD9673EFJ and/or BD9876EFJ. While accepting a wide power supply of 7-42V, a step down output of 1.2V/1.8V/3.3V/5V or any other user defined voltage can be produced. The ICs have an internal 200mohm Nch MOSFET (3.5A max) and a synchronization frequency range of 200 kHz to 500 kHz.

A Soft Start circuit prevents in-rush current during startup along with UVLO (low voltage error prevention circuit) and TSD (thermal shutdown detection) protection circuits. An EN pin allows for simple ON/OFF control of the IC to reduce standby current consumption.

Specifications

Manufacturer Rohm Semiconductor
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Single Output
Eval Board Part Number BD9673AEFJ_EVK-ND
Eval Board Supplier Rohm Semiconductor
Eval Board Normally In Stock
Topology Step Down
Outputs and Type 1 Non-Isolated
Voltage Out: Factory Set 1.2 V
1.8 V
3.3 V
5 V
Current Out 1.5 A
Voltage In 7 ~ 42 V
Efficiency @ Conditions >90%, 12V in, 5V @ 0.2 ~ 1.5 A
>85%, 24V in, 5V @ 0.3 ~ 1.5 A
Voltage Out Range 1 ~ Vcc x 0.7
Features Shutdown, Enable, Standby
Soft Start
Synchronizable
Thermal Protection
Under Voltage Protection, Brown-Out
Switching Frequency 300 kHz
Standby Current [Typical] 0 µA
Quiescent Current [Typical] 1 mA
Component Count + Extras 12 + 5
Internal Switch Yes
Design Author Rohm
Application / Target Market Point of Load (PoL)
Standby Current [Maximum] 10 µA
Quiescent Current [Maximum] 2 mA
Main I.C. Base Part BD9673
Date Created By Author 2013-08
Date Added To Library 2014-01

Support Documents & Media

BD9673AEFJ_EVK - User Guide BD9673EFJ - Datasheet

Media

BD9673AEFJ_EVK_Schematic_Full.png BD9673AEFJ_EVK_Board_Full.jpg BD9673AEFJ_EVK_Chart_Full.png