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Notice

ROHM  Customer Support System 

http://www.rohm.com/contact/

Thank you for your accessing to ROHM product informations.  
More detail product informations and catalogs are available, please contact us. 

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The information contained herein is subject to change without notice. 

Before you use our Products, please contact our sales representative

 

and verify the latest specifica-

tions :

Although ROHM is continuously working to improve product reliability and quality, semicon-
ductors can break down and malfunction due to various factors.
Therefore, in order to prevent personal injury or fire arising from failure, please take safety 
measures such as complying with the derating characteristics, implementing redundant and 
fire prevention designs, and utilizing backups and fail-safe procedures. ROHM shall have no 
responsibility for any damages arising out of the use of our Poducts beyond the rating specified by 
ROHM.

Examples of application circuits, circuit constants and any other information contained herein are 
provided only to illustrate the standard usage and operations of the Products. The peripheral 
conditions must be taken into account when designing circuits for mass production.

The technical information specified herein is intended only to show the typical functions of and 
examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, 
any license to use or exercise intellectual property or other rights held by ROHM or any other 
parties. ROHM shall have no responsibility whatsoever for any dispute arising out of the use of 
such technical information.

The Products specified in this document are not designed to be radiation tolerant.

For use of our Products in applications requiring a high degree of reliability (as exemplified  
below), please contact and consult with a ROHM representative : transportation equipment (i.e. 
cars, ships, trains), primary communication equipment, traffic lights, fire/crime prevention, safety 
equipment, medical systems, servers, solar cells, and power transmission systems.

Do not use our Products in applications requiring extremely high reliability, such as aerospace 
equipment, nuclear power control systems, and submarine repeaters.

ROHM shall have no responsibility for any damages or injury arising  from non-compliance with 
the recommended usage conditions and specifications contained herein.

ROHM has used reasonable care to ensur

H

 the accuracy of the information contained  in this 

document. However, ROHM does not warrants that such information is error-free, and ROHM 
shall have no responsibility for any damages arising from any inaccuracy or misprint of such 
information.

Please use the Products in accordance with any applicable environmental laws and regulations, 
such as the RoHS Directive. For more details, including RoHS compatibility, please contact a 
ROHM sales office. ROHM shall have  no responsibility for any damages or losses resulting 
non-compliance with any applicable laws or regulations.

When providing our Products and technologies contained in this document to other countries,  
you must abide by the procedures and provisions stipulated in all applicable export laws and 
regulations, including without limitation the US Export Administration Regulations and the Foreign 
Exchange and Foreign Trade Act.

This document, in part or in whole, may not be reprinted or reproduced without prior consent of 
ROHM.

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Summary of Contents for BD9B304QWZ

Page 1: ...is 1 0MHz 2 0MHz selectable It adopts a Deep SLLM compliant fixed on time control method that consumes low current at light loads making it ideal for equipment that wants to reduce standby power cons...

Page 2: ...2020 User s Guide BD9B304QWZ EVK 001 EVK Overview Figure 1 BD9B304QWZ EVK 001 Top View A 3 points switch implements on either SW_MODE and SW_IN on actual EVK EVK Schematic Figure 2 BD9B304QWZ EVK 001...

Page 3: ...ad to the EVK s VOUT and GND terminals When using an electronic load connect with the load turned off 4 Connect a voltmeter to the EVK s VOUT and GND terminals 5 Connect the EN to the VIN terminal of...

Page 4: ...tween Deep SLLM and PWM Parts list Table 3 Parts list Part No Value Manufacturer Model number Size Unit mm inch IC U1 ROHM BD9B304QWZ 2 00 x 2 00 Inductor L1 1 0 H MURATA FDSD0420 H 1R0M 4 20 x 4 20 C...

Page 5: ...information Number of Layers Material Board Size Copper Thickness 4 FR 4 50mm x 40mm x 1 6mmt 1oz 35 m The layout of BD9B304QWZ EVK 001 is shown below Figure 3 Top Layer Layout Top View Figure 4 Midd...

Page 6: ...ser s Guide BD9B304QWZ EVK 001 Reference application data Figure 7 Efficiency vs Load Current VVIN 5 0V VOUT 1 2V L 1 0 H Figure 8 Line Regulation VOUT 1 2V IOUT 3A Figure 9 Load Regulation VVIN 5 0V...

Page 7: ...veform VVIN 5 0V VOUT 1 2V VMODE VVIN IOUT 3 0A Figure 12 Load Response IOUT 0 1A 3A VVIN 5 0V VOUT 1 2V VMODE 0V COUT 22 Fx2 Figure 13 Load Response IOUT 0A 3A VVIN 5 0V VOUT 1 2V VMODE VVIN COUT 22...

Page 8: ...VFREQ VVIN RLOAD 0 4 Figure 16 Boot by VIN VIN 0V 5V VOUT 1 2V VFREQ VVIN RLOAD 0 4 Figure 17 Shutdown by VIN VIN 5V 0V VOUT 1 2V VFREQ VVIN RLOAD 0 4 Time 1ms div VOUT 1V div VEN 5V div VVIN 5V div V...

Page 9: ...9 9 2020 ROHM Co Ltd No 63UG041E Rev 001 AUG 2020 User s Guide BD9B304QWZ EVK 001 Revision History Date Revision Number Description 27 AUG 2020 001 Initial release...

Page 10: ...hnical information The Products specified in this document are not designed to be radiation tolerant For use of our Products in applications requiring a high degree of reliability as exemplified below...

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