ROHM BD9P208MUF-TSB-001 Converter For Automotive Evaluation Board User Guide

ROHM BD9P208MUF-TSB-001 Converter For Automotive Evaluation Board

Product Information

Specifications

2.0 A (Max)
Switching Frequency| –| –| 2.2| MHz| –
Maximum Efficiency| –| 86.1| –| %| Maximum Efficiency
Maximum Efficiency| –| 91.3| –| %| –

Product Description

The BD9P208MUF-C Buck DC/DC Converter is a single 2.2 MHz buck DC/DC converter designed for automotive applications. It is equipped with integrated POWER MOSFETs and operates in current mode synchronous mode. The converter accepts an input voltage range of  3.5 V to 40 V and can generate a maximum output current of 2 A. The output voltage range is configurable from 0.8 V to 8.5 V using external resistors.

Application

• Automotive Powered Supplies
• Consumer Powered Supplies

Operating Procedure

1. Turn off EN and connect the GND terminal of the power supply to the GND terminal of the Evaluation Board.
2. Connect the VCC pin of the power supply to the VBAT pin of the Evaluation Board.
3. Connect the load to the Evaluation Board’s VOUT and GND terminals. When using an electronic load, connect with the load turned off.
4. Connect a voltmeter to the Evaluation Board’s VOUT and GND terminals.
5. Turn on the Power supply of VBAT. Turn ON the switch of EN terminal.
6. Make sure that the voltmeter is set to measure voltage.
7. Turn on the electronic load. (Caution) This Evaluation Board does not support hot plugs. Do not perform a hot plug test.

Operation Mode Settings

Below is a table of BD9P208MUF-C operation modes selectable using OCP_SEL, MODE, and SSCG terminals.

2.250 A (Typ.)
MODE| LOW or OPEN| Apply a clock to this pin| Forced PWM mode| Automatically switched between PWM and LLM mode.
SSCG| ON (HIGH)| OFF (LOW)| Select Spread Spectrum function| Enable Spread Spectrum
–| –| –| –| Disable Spread Spectrum

Frequently Asked Questions (FAQ)

1. Can the input voltage range be lower than 3.5 V?
   No, the minimum input voltage supported is 3.5 V.

2. What is the maximum output current?
   The maximum output current is 2 A.

3. How do I set the output voltage?
   The output voltage can be set within the range of 0.8 V to 8.5 V  using external resistors.

4. Can I perform hot plug testing with this Evaluation  Board?
   No, this Evaluation Board does not support hot plug testing.

Single 2.2 MHz Buck DC/DC Converter For Automotive
BD9P208MUF-C Evaluation Board
BD9P208MUF-TSB-001 (3.5 to 40V Input, 2.0A)

Introduction

This user’s guide will provide the necessary steps to operate the Evaluation Board of ROHM’s BD9P208MUF-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 2.2 MHz buck DC/DC converter BD9P208MUF-C. BD9P208MUFC is a current mode synchronous buck DC/DC converter with integrated POWER MOSFETs. The BD9P208MUF-C accepts a  power supply input range of 3.5 V to 40 V and generates a maximum output current of 2 A. BD9P208MUF-C generates an output voltage range of 0.8 V to 8.5 V using external resistors.

Application

Automotive Powered Supplies
Consumer Powered Supplies

Recommended Operating Conditions

2.0 A (Max)
Switching Frequency| –| 2.2| –| MHz|
Maximum Efficiency| –| 86.1| –| %| VO = 3.3 V, Io = 0.8 A, Ta = 25 °C
Maximum Efficiency| –| 91.3| –| %| VO = 5.0 V, Io = 1.1 A, Ta = 25 °C

( Note1 ) Although the minimum output voltage is configurable up to 0.8 V, it may be limited by the SW min ON pulse width. For the same reason, although the maximum output voltage is configurable up to 8.5 V, it may be limited by the SW minimum OFF pulse width.

Evaluation Board

Evaluation Board Schematic

Operating Procedure

1. Turn off EN and connect the GND terminal of the power supply to the GND terminal of Evaluation Board.
2. Connect VCC pin of power supply to the VBAT pin of the Evaluation Board.
3. Connect the load to the Evaluation Board’s VOUT and GND terminals. When using an electronic load, connect with the load turned off.
4. Connect a voltmeter to the Evaluation Board’s VOUT and GND terminals.
5. Turn on the Power supply of VBAT. Turn ON the switch of EN terminal.
6. Make sure that the voltmeter is set to measure voltage.
7. 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 VBAT only.

Operation Mode Settings
Below is a table of BD9P208MUF-C operation modes selectable using OCP_SEL, MODE and SSCG terminals

OCP_SEL

| HIGH|

OCP threshold selection

| OCP threshold is set to 2.250 A (Typ.) Output Current maximum is 1.5 A.
LOW| OCP threshold is set to 3.0 A (Typ.)

Output Current maximum is 2.0 A.

MODE

| HIGH| FPWM| Forced PWM mode
LOW or OPEN| AUTO| Automatically switched between PWM and LLM mode.
Apply a clock to this pin| SYNC| Activate synchronization mode

SSCG

| ON (HIGH)| Select Spread Spectrum function| Enable Spread Spectrum
OFF (LOW)| Disable Spread Spectrum

( Note ) If setting is High, the terminal is shorted to VREG, and if setting is Low, the terminal is shorted to GND.

Pin Configuration

Parts List (BD9P208MUF-C)

π type filter

| CF1| 4.7μF| 1210| 3225| Murata| GCM32ER71H475K
CF3| Open| –| –| –| –
LF1| 2.2μH| 2524h18| 6360h45| TDK| CLF6045NIT-2R2N-D
CF2| 0.1μF| 0402| 1005| Murata| GCM155R71H104K
CBLK| 220μF| 0404h04| 1010h10| Nichicon| UWD1V221MCL1GS

Basic

| CIN2| 4.7μF| 1210| 3225| Murata| GCM32ER71H475K
CIN1| 0.1μF| 0402| 1005| Murata| GCM155R71H104K
CIN1B| Open| –| –| –| –
CVREG| 1μF| 0805| 2012| Murata| GCM21BR71C105K
CBST| 0.1μF| 0402| 1005| Murata| GCM155R71H104K
RBST| 0Ω| 0402| 1005| ROHM| MCR01 Series
RSNB| Open| –| –| –| –
CSNB| Open| –| –| –| –
RRST| 10kΩ| 0402| 1005| ROHM| MCR01 Series
RRST2 (Note 3)| Open| –| –| –| –

Application

| L1| 3.3μH| 2524h18| 6360h45| TDK| CLF6045NIT-3R3N-D
COUT1 (Note 1)| 22μF| 1210| 3225| Murata| GCM32ER71A226K
COUT2 (Note 1)| 22μF| 1210| 3225| Murata| GCM32ER71A226K
COUT3 (Note 1)| Open| –| –| –| –
COUT4 (Note 1)| Open| –| –| –| –
RFB0| 0Ω| 0402| 1005| ROHM| MCR01 Series
RFB1| 75kΩ| 0402| 1005| ROHM| MCR01 Series
RFB2| 24kΩ| 0402| 1005| ROHM| MCR01 Series
CFB1 (Note 4)| Open| –| –| –| –
CFB2 (Note 4)| Open| –| –| –| –
RDIS| 0Ω| 0402| 1005| ROHM| MCR01 Series
RDISN| Open| –| –| –| –
REX (Note 2)| 0Ω| 0402| 1005| ROHM| MCR01 Series
REXN (Note 2)| Open| –| –| –| –
 | Part No| Value| PKG(inch)| PKG(mm)| Manufacturer| Part Name(Series)
---|---|---|---|---|---|---

π type filter

| CF1| 4.7μF| 1210| 3225| Murata| GCM32ER71H475K
CF3| Open| –| –| –| –
LF1| 2.2μH| 2524h18| 6360h45| TDK| CLF6045NIT-2R2N-D
CF2| 0.1μF| 0402| 1005| Murata| GCM155R71H104K
CBLK| 220μF| 0404h04| 1010h10| Nichicon| UWD1V221MCL1GS

Basic

| CIN2| 4.7μF| 1210| 3225| Murata| GCM32ER71H475K
CIN1| 0.1μF| 0402| 1005| Murata| GCM155R71H104K
CIN1B| Open| –| –| –| –
CVREG| 1μF| 0805| 2012| Murata| GCM21BR71C105K
CBST| 0.1μF| 0402| 1005| Murata| GCM155R71H104K
RBST| 0Ω| 0402| 1005| ROHM| MCR01 Series
RSNB| Open| –| –| –| –
CSNB| Open| –| –| –| –
RRST| 10kΩ| 0402| 1005| ROHM| MCR01 Series
RRST2 (Note 3)| Open| –| –| –| –

Application

| L1| 3.3μH| 2524h18| 6360h45| TDK| CLF6045NIT-3R3N-D
COUT1 (Note 1)| 22μF| 1210| 3225| Murata| GCM32ER71A226K
COUT2 (Note 1)| 22μF| 1210| 3225| Murata| GCM32ER71A226K
COUT3 (Note 1)| Open| –| –| –| –
COUT4 (Note 1)| Open| –| –| –| –
RFB0| 0Ω| 0402| 1005| ROHM| MCR01 Series
RFB1| 68kΩ| 0402| 1005| ROHM| MCR01 Series
RFB2| 13kΩ| 0402| 1005| ROHM| MCR01 Series
CFB1 (Note 4)| Open| –| –| –| –
CFB2 (Note 4)| Open| –| –| –| –
RDIS| 0Ω| 0402| 1005| ROHM| MCR01 Series
RDISN| Open| –| –| –| –
REX (Note 2)| 0Ω| 0402| 1005| ROHM| MCR01 Series
REXN (Note 2)| Open| –| –| –| –

Note

Max Output Current|

VOUT

|

OCP_SEL

| Recommended L Value| Recommended COUT Value| Minimum COUT Value (Note1-1,2)
---|---|---|---|---|---
 | ≥ 3.3 V|

L

| 3.3 μH| COUT ≥ 44 μF| COUT_WORST ≥ 30 μF
2.0 A| > 1.1 V

< 3.3 V

| 3.3 μH| COUT ≥ 145.2 μF (*)

????

| COUT_WORST ≥ 99.0 μF (*)

????

 | ≤ 1.1 V| 4.7 μH| COUT ≥ 217.8 μF (*)

????

| COUT_WORST ≥ 148.5 μF (*)

????

 | ≥ 3.3 V|

H

| 4.7 μH| COUT ≥ 32 μF| COUT_WORST ≥ 20 μF
1.5 A| > 1.1 V

< 3.3 V

| 4.7 μH| COUT ≥ 105.6 μF (*)

????

| COUT_WORST ≥ 66.0 μF (*)

????

 | ≤ 1.1 V| 6.8 μH| COUT ≥ 126.7 μF (*)

????

| COUT_WORST ≥ 100.0 μF (*)

????

VOUT is the output voltage [V]

• Note 1-1 When selecting the output capacitor, ensure that the capacitance, COUT_WORST, of the above equation is maintained at the characteristics of DC Bias, AC Voltage, temperature, and tolerance.

• Note 1-2 If the capacitance falls below this value, oscillation may happen. When using electrolytic capacitor and conductive polymer hybrid aluminum electrolytic capacitor, please place it in addition to the ceramic capacitors with the capacity described above. The changes in the frequency characteristic are greatly affected by the type and the condition (temperature, etc.) of parts that are used, the wire routing and the layout of the PCB. Please confirm stability and responsiveness in actual application.

• Note 2 VCC_EX is power supply input for internal circuit. VREG voltage is supplied from VCC_EX when voltage between 3.2V  (VTEXH, Max) and 5.65 V (VEXOVPL, Min) is connected to this pin. Connecting this pin to VOUT improves efficiency. In case of not use this function, connect this pin to GND.
  Output Voltage| REX setting| REXN setting| VCC_EX State
  ---|---|---|---
  3.2 V ≤ VOUT ≤ 5.65 V| 0 Ω| Open| Connected to VOUT
  VOUT < 3.2 V or VOUT > 5.65 V| Open| 0 Ω| Connected to GND

• Note 3 RESET terminal should be pulled-up to VREG via RRST2 when the output setting is over 6.5 V because RESET pin’s
  absolute maximum rating is 7.0 V. If RESET is not pulled-up to VOUT, it can be pulled-up to VREG via RRST2 by default.

• Note 4 Please use CFB1 and CFB2 PCB patterns to improve the frequency characteristics. Set these values by following
  the guide in page 31 of datasheet.

• Note 5 If the recommended parts on tables 3 to 7 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

2oz(70μm)

The layout is shown below.

Revision History

Date

| Revision Number| ****

Description

---|---|---
7. Jul. 2023| 001| New release

Notice

1. The information contained in this document is intended to introduce ROHM Group (hereafter referred to as ROHM) products. When using ROHM products, please verify the latest specifications or datasheets before use
2. 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.
3. Electronic components, including semiconductors, can fail or malfunction at a certain rate. Please be sure to implement, at your 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.
4. 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 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.
5. 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 by these provisions.
6. 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 concerning the information contained herein.
7. No part of this document may be reprinted or reproduced in any form by any means without the  prior written consent of ROHM
8. 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.
9. 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

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References

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