ROHM BD9S209NUX-C Evaluation Board
Product Information
Specifications
- Input Voltage: 2.7V – 5.5V
- Output Voltage: 0.8V – VIN
- Output Current Range: Up to 2.0A
- Switching Frequency: 2.2MHz
- Maximum Efficiency: Up to 87.32%
Product Usage Instructions
Operating Procedure
- Turn off EN and connect the GND terminal of the power supply to the GND terminal of the Evaluation Board.
- Connect the power supply to the VIN terminal of the Evaluation Board.
- Connect the load to the Evaluation Board’s VOUT and GND terminals. If using an electronic load, ensure it is turned off.
- Connect a voltmeter to the Evaluation Board’s VOUT and GND terminals.
- Turn on the power supply of VIN and switch on the EN terminal.
- Ensure the voltmeter is set to measure voltage.
- Turn on the electronic load. Note: This Evaluation Board does not support hot plug, so avoid performing hot plug tests.
FAQ
Frequently Asked Questions
- Q: Can the BD9S209NUX-C Evaluation Board support hot plug?
- A: No, the Evaluation Board does not support hot plug. Avoid performing hot plug tests.
- Q: What is the minimum and maximum input voltage supported by the BD9S209NUX-C?
- A: The BD9S209NUX-C supports an input voltage range of 2.7V to 5.5V.
- Q: What is the maximum efficiency of the BD9S209NUX-C at an output voltage of 1.2V?
- A: The BD9S209NUX-C can achieve a maximum efficiency of up to 87.32% at an output voltage of 1.2V.
Introduction
This user’s guide will provide the necessary steps to operate the Evaluation Board of ROHM’s BD9S209NUX-C Buck DC/DC converter. This includes the external parts, operating procedures and application data.
Description
This Evaluation Board was developed for ROHM’s single Synchronous buck DC/DC converter BD9S209NUX-C. It is a synchronous buck DC/DC converter with built-in low On Resistance power MOSFETs. BD9S209NUX-C accepts a power supply input range of 2.7 V to 5.5 V and generates a maximum output current of 2 A. Small inductor is applicable due to high switching frequency of 2.2 MHz. It is a current mode control DC/DC Converter and features high-speed transient response. It has a built-in phase compensation circuit. Applications can be created with a few external components.
Application
- Automotive Equipment
- Other Electronic Equipment
Recommended Operating Conditions
Table 1. Recommended Operating Conditions
| Parameter | Min | Typ | Max | Units | Conditions |
| Input Voltage | 2.7 | – | 5.5 | V | |
| Output Voltage (Note1) | 0.8 | – | VIN | V | |
| Output Current Range | – | – | 2.0 | A | |
| Switching Frequency | – | 2.2 | – | MHz | |
| Maximum Efficiency (Vo = 1.2 V) | – | 87.32 | – | % | VIN = 3.3 V, Io = 0.4A, Ta = 25 °C |
Note 1: Although the minimum output voltage is configurable up to 0.8 V, it may be limited by the SW min ON pulse width. SW Minimum ON Time that BD9S209NUX-C can output stably in the entire load range is 80 ns. Use the value to calculate the input and output conditions that satisfy the equation of 80 [ns]
Evaluation Board
Evaluation Board Schematic
Operating Procedure
- Turn off EN and connect the GND terminal of the power supply to the GND terminal of Evaluation Board.
- Connect power supply to the VIN terminal of the Evaluation Board.
- Connect the load to the Evaluation Board’s VOUT and GND terminals. When using an electronic load, connect with the load turned off.
- Connect a voltmeter to the Evaluation Board’s VOUT and GND terminals.
- Turn on the Power supply of VIN. Turn ON the switch of EN terminal.
- Make sure that the voltmeter is set to measure voltage.
- Turn on the electronic load.
(Caution) This Evaluation Board does not support hot plug. Do not perform hot plug test.
(Note) If EN = High (EN short to VIN) before Power ON, the turn ON and turn OFF is controlled by VIN only.
Pin Configuration
Parts list
Table 2. Parts List (VOUT=1.0V, VIN=5.0V, 3.3V)
| No | Package | Parameters | Part Name (Series) | Type | Manufacturer |
| L1 | 2520 | 0.68 μH | DFE252012PD-R68M | Inductor | Murata |
| COUT1 | 2012 | 10 μF, X7R, 10 V | GCM21BR71A106KE21 | Ceramic Capacitor | Murata |
| CIN1 | 2012 | 10 μF, X7R, 10 V | GCM21BR71A106KE21 | Ceramic Capacitor | Murata |
| R100 | – | SHORT | – | – | – |
| R1
(Note1) |
0603 | 7.5 kΩ, 1 %, 1/20 W | MCR006 series | Chip Resistor | ROHM |
| R2
(Note1) |
0603 | 30 kΩ, 1 %, 1/20 W | MCR006 series | Chip Resistor | ROHM |
| R3 | 0603 | 100 kΩ, 1 %, 1/20 W | MCR006 series | Chip Resistor | ROHM |
| CSS | – | – | – | – | – |
| C1 | 1005 | 100 pF, C0G, 50 V | GCM1555C1H101JA16 | Ceramic Capacitor | Murata |
| COUT2 | – | – | – | – | – |
| CIN2 | – | – | – | – | – |
| CF1 | – | – | – | – | – |
| CF2 | – | – | – | – | – |
| F1 | – | – | – | – | – |
| CF3 | – | – | – | – | – |
Table 3. Parts List (VOUT=1.2V, VIN=5.0V, 3.3V)
| No | Package | Parameters | Part Name (Series) | Type | Manufacturer |
| L1 | 2520 | 0.68 μH | DFE252012PD-R68M | Inductor | Murata |
| COUT1 | 2012 | 10 μF, X7R, 10 V | GCM21BR71A106KE21 | Ceramic Capacitor | Murata |
| CIN1 | 2012 | 10 μF, X7R, 10 V | GCM21BR71A106KE21 | Ceramic Capacitor | Murata |
| R100 | – | SHORT | – | – | – |
| R1
(Note1) |
0603 | 10 kΩ, 1 %, 1/20 W | MCR006 series | Chip Resistor | ROHM |
| R2
(Note1) |
0603 | 20 kΩ, 1 %, 1/20 W | MCR006 series | Chip Resistor | ROHM |
| R3 | 0603 | 100 kΩ, 1 %, 1/20 W | MCR006 series | Chip Resistor | ROHM |
| CSS | – | – | – | – | – |
| C1 | 1005 | 100 pF, C0G, 50 V | GCM1555C1H101JA16 | Ceramic Capacitor | Murata |
| COUT2 | – | – | – | – | – |
| CIN2 | – | – | – | – | – |
| CF1 | – | – | – | – | – |
| CF2 | – | – | – | – | – |
| F1 | – | – | – | – | – |
| CF3 | – | – | – | – | – |
Table 4. Parts List (VOUT=1.5V, VIN=5.0V, 3.3V)
| No | Package | Parameters | Part Name (Series) | Type | Manufacturer |
| L1 | 2520 | 0.68 μH | DFE252012PD-R68M | Inductor | Murata |
| COUT1 | 2012 | 10 μF, X7R, 10 V | GCM21BR71A106KE21 | Ceramic Capacitor | Murata |
| CIN1 | 2012 | 10 μF, X7R, 10 V | GCM21BR71A106KE21 | Ceramic Capacitor | Murata |
| R100 | – | SHORT | – | – | – |
| R1
(Note1) |
0603 | 16 kΩ, 1 %, 1/20 W | MCR006 series | Chip Resistor | ROHM |
| R2
(Note1) |
0603 | 18 kΩ, 1 %, 1/20 W | MCR006 series | Chip Resistor | ROHM |
| R3 | 0603 | 100 kΩ, 1 %, 1/20 W | MCR006 series | Chip Resistor | ROHM |
| CSS | – | – | – | – | – |
| C1 | 1005 | 100 pF, C0G, 50 V | GCM1555C1H101JA16 | Ceramic Capacitor | Murata |
| COUT2 | – | – | – | – | – |
| CIN2 | – | – | – | – | – |
| CF1 | – | – | – | – | – |
| CF2 | – | – | – | – | – |
| F1 | – | – | – | – | – |
| CF3 | – | – | – | – | – |
Table 5. Parts List (VOUT=1.8V, VIN=5.0V, 3.3V)
| No | Package | Parameters | Part Name (Series) | Type | Manufacturer |
| L1 | 2520 | 1.0 μH | TFM252012ALMA1R0M | Inductor | TDK |
| COUT1 | 2012 | 10 μF, X7R, 10 V | GCM21BR71A106KE21 | Ceramic Capacitor | Murata |
| CIN1 | 2012 | 10 μF, X7R, 10 V | GCM21BR71A106KE21 | Ceramic Capacitor | Murata |
| R100 | – | SHORT | – | – | – |
| R1
(Note1) |
0603 | 30 kΩ, 1 %, 1/20 W | MCR006 series | Chip Resistor | ROHM |
| R2
(Note1) |
0603 | 24 kΩ, 1 %, 1/20 W | MCR006 series | Chip Resistor | ROHM |
| R3 | 0603 | 100 kΩ, 1 %, 1/20 W | MCR006 series | Chip Resistor | ROHM |
| CSS | – | – | – | – | – |
| C1 | 1005 | 100 pF, C0G, 50 V | GCM1555C1H101JA16 | Ceramic Capacitor | Murata |
| COUT2 | – | – | – | – | – |
| CIN2 | – | – | – | – | – |
| CF1 | – | – | – | – | – |
| CF2 | – | – | – | – | – |
| F1 | – | – | – | – | – |
| CF3 | – | – | – | – | – |
Table 6. Parts List (VOUT=3.3V, VIN=5.0V)
| No | Package | Parameters | Part Name (Series) | Type | Manufacturer |
| L1 | 2520 | 1.0 μH | TFM252012ALMA1R0M | Inductor | TDK |
| COUT1 | 2012 | 10 μF, X7R, 10 V | GCM21BR71A106KE21 | Ceramic Capacitor | Murata |
| CIN1 | 2012 | 10 μF, X7R, 10 V | GCM21BR71A106KE21 | Ceramic Capacitor | Murata |
| R100 | – | SHORT | – | – | – |
| R1
(Note1) |
0603 | 75 kΩ, 1 %, 1/20 W | MCR006 series | Chip Resistor | ROHM |
| R2
(Note1) |
0603 | 24 kΩ, 1 %, 1/20 W | MCR006 series | Chip Resistor | ROHM |
| R3 | 0603 | 100 kΩ, 1 %, 1/20 W | MCR006 series | Chip Resistor | ROHM |
| CSS | – | – | – | – | – |
| C1 | 1005 | 100 pF, C0G, 50 V | GCM1555C1H101JA16 | Ceramic Capacitor | Murata |
| COUT2 | – | – | – | – | – |
| CIN2 | – | – | – | – | – |
| CF1 | – | – | – | – | – |
| CF2 | – | – | – | – | – |
| F1 | – | – | – | – | – |
| CF3 | – | – | – | – | – |
(Note 1) VOUT =
(Note 2) CSS, COUT2, CIN2, CF1, CF2, F1, CF3 patterns are only optional. They can be utilized for adjusting the characteristics constants.
(Note 3) If the recommended parts on tables 2, 3, 4, 5 and 6 are not available anymore due to end of production, different parts will be used on the test board because the end of production parts are deprecated.
Board Layout
Evaluation Board PCB information
| Number of Layers | Material | Board Size | Copper Thickness |
| 4 | FR4 High TG | 114.3mm x 76.2mm x 1.6mm | 2oz(70μm) / 1oz (35μm) / 1oz (35μm) / 2oz(70μm) |
The layout of BD9SXXXNUX-C series board is shown below
Revision History
| Date | Revision Number | Description |
| 16.Apr.2024 | 001 | New Release |
Notice
- The information contained in this document is intended to introduce ROHM Group (hereafter referred to asROHM) products. When using ROHM products, please verify the latest specifications or datasheets before use.
- ROHM products are designed and manufactured for use in general electronic equipment and applications (such as Audio Visual equipment, Office Automation equipment, telecommunication equipment, home appliances, amusement devices, etc.) or specified in the datasheets. Therefore, please contact the ROHM sales representative before using ROHM products in equipment or devices requiring extremely high reliability and whose failure or malfunction may cause danger or injury to human life or body or other serious damage (such as medical equipment, transportation, traffic, aircraft, spacecraft, nuclear power controllers, fuel control, automotive equipment including car accessories, etc. hereafter referred to as Specific Applications). Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any damages, expenses, or losses incurred by you or third parties arising from the use of ROHM Products for Specific Applications.
- Electronic components, including semiconductors, can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe design against physical injury, and damage to any property, which a failure or malfunction of products may cause.
- The information contained in this document, including application circuit examples and their constants, is intended to explain the standard operation and usage of ROHM products, and is not intended to guarantee, either explicitly or implicitly, the operation of the product in the actual equipment it will be used. As a result, you are solely responsible for it, and you must exercise your own independent verification and judgment in the use of such information contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses, or losses incurred by you or third parties arising from the use of such information.
- When exporting ROHM products or technologies described in this document to other countries, you must abide by the procedures and provisions stipulated in all applicable export laws and regulations, such as the Foreign Exchange and Foreign Trade Act and the US Export Administration Regulations, and follow the necessary procedures in accordance with these provisions.
- The technical information and data described in this document, including typical application circuits, are examples only and are not intended to guarantee to be free from infringement of third parties intellectual property or other rights. ROHM does not grant any license, express or implied, to implement, use, or exploit any intellectual property or other rights owned or controlled by ROHM or any third parties with respect to the information contained herein.
- No part of this document may be reprinted or reproduced in any form by any means without the prior written consent of ROHM.
- All information contained in this document is current as of the date of publication and subject to change without notice. Before purchasing or using ROHM products, please confirm the latest information with the ROHM sales representative.
- ROHM does not warrant that the information contained herein is error-free. ROHM shall not be in any way responsible or liable for any damages, expenses, or losses incurred by you or third parties resulting from errors contained in this document.
Info
Thank you for your accessing to ROHM product informations.
More detail product informations and catalogs are available, please contact us.
ROHM Customer Support System
https://www.rohm.com/contactus
www.rohm.com
© 2023 ROHM Co., Ltd. All rights reserved.
Documents / Resources
 |
ROHM BD9S209NUX-C Evaluation Board [pdf] User Guide BD9S209NUX-C, BD9S209NUX-TSB-001, BD9S209NUX-C Evaluation Board, BD9S209NUX-C, Evaluation Board, Board |