Linear Regulators, Switching Regulator ICs

LDO, DC-DC Converter Design Tool
Selection Guide
Using the Design Tools on the ROHM Website© 2022-2024 ROHM Co., Ltd.

Ver. 2.0

Catalog No. 67G7391E FrontCover
07.2024

Linear Regulators, Switching Regulator ICs

LDO, DC-DC Converter Design Tool Selection Guide
Using the Design Tools on the ROHM Website
On the ROHM website, we provide technical data including application notes,
online simulators, various simulation models, and other design tools such as

Start Herespreadsheets for calculation of constants. This guide explains how to use various

Tools for each development step

design tools throughout the development steps for LDO and DC-DC converters.

Initial Study• Since the guide requires access to the ROHM website, ensure you have a-

Topology Selection-

Reference Design-

Package Information-

Reference Design-

DATA SHEET-PCB Library-

DATA SHEET-

Calculation Sheet-

3D Model-Evaluation Board (EVK) -Application Note-

Application Note-

Web Simulation

reliable Internet connection.
• Do not use the functions of your PDF browser to move back and forth between
pages. Use the buttons on the pages instead.
• This guide may not display correctly if the PDF file is viewed with a web
browser. Use a PDF reader such as Adobe Acrobat.
Notes

Notes

© 2022-2024 ROHM Co., Ltd.

Evaluation

PCB Design-

Evaluation Board (EVK) --Web Simulation-

Design Model

DATA SHEET-Application Note

Start HereHow to use this guide:

Circuit Design

TOP

Initial Study

Circuit Design

PCB Design

Tools

1

6

Topology Selection
wwwShows the devices best suited for the respective
topologies.

Calculation Sheeti

Package Informationi

10 PCB Library

Reference Design
Evaluation results on the system level and design data are provided as reference designs.

iwwwFootprints and symbol data for PCB CAD areprovided.

i

www

3

Information including reference land patterns
and mounting conditions is provided.

i

i

www

2

Design calculation tool in Excel to assist you indesigning the constants of peripheral parts.

9

DATA SHEETSpecification documents describing the electrical characteristics of products, precautions, pin layouts, examples of application circuits, etc.
i

Tools

i
4

11 3D Model

Evaluation Board (EVK: Evaluation Kit)i

Evaluation board to perform initial considerations and characterizations, which can be purchased fromonline distributors.

i5iModels representing outline images on 3D CAD
are provided as STEP data.

i

Web Simulation (ROHM Solution Simulator)
Free online simulator allowing you to easily design the constants of peripheral parts.
i
Catalogi

wwwCatalogwww7Click the button for the tool you wantto view
Button descriptionsiApplication Note
Application notes have been published to help circuit design, thermal design, PCB design, and evaluation methods.
i
Catalogi

Tool introduction
www Displays the website
Catalog

8

Design Model

Displays the catalogi© 2022-2024 ROHM Co., Ltd.

Catalog

Provides models for SPICE and other CAE tools
including thermal analysis.

i

Evaluation

Back

How to obtain a data sheet
Obtain through one of the following methods:

TOP

s

Tools

Method 1. If the product name is known

Step 3: When the product page is displayed, click the [DATA SHEET] button. In addition, you
can obtain further technical information by scrolling down the product page.

Step 1: Click the search icon in the upper right of the ROHM website and enter the productname into the search window.

Next page

Next pagei

Step 2: To take a shortcut, click the PDF icon.
Usually, click the product name (recommended).

Information

DATA
SHEET
Page 1 / 2© 2022-2024 ROHM Co., Ltd.

Information
Various types oftechnical information areprovided on the bottomof the page, including
white papers, user’s
guides, application
notes, and simulation
models.

How to obtain a data sheet (continued)

Back
TOP

Method 2. If the product name is not certains

Step 4: When the product page is displayed, click the [DATA SHEET] button. In addition, you
can obtain further technical information by scrolling down the product page.

Step 1: Select “Power Management” in “Products” on the ROHM website.

Tools

Click
Click

Step 2: Enter the conditions and click the [SHOW] button.

i

Information

DATA
SHEET

Previous page

Previous page

Information

Page 2 / 2© 2022-2024 ROHM Co., Ltd.

Click

Click

Step 3: The search result is displayed. To take a shortcut, click the PDF icon.
Usually, click the product name (recommended).

Various types oftechnical information areprovided on the bottomof the page, including
white papers, user’s
guides, application
notes, and simulation
models.

Back

How to obtain EVKTOP

Step 4: If the “Evaluation Board” section is displayed, the board is available for purchase. Clickthe [Buy] button.

s

Tools

Step 1: Click the search icon in the upper right of the ROHM website and enter the productname into the search window.

Information
If the product is not available
from the online distributor, the[Purchase Inquiry] button isdisplayed instead of the [Buy]button. Contact the distributor
to make an inquiry.

Step 2: Click the product name.

i

Step5: The availability from online distributors is displayed. Purchase the product through theirwebsite.

Information

EVK
Page 1 / 1

Step 3: When the product page is displayed, scroll down the page.
Click

ScrollInformation© 2022-2024 ROHM Co., Ltd.

No document is suppliedwith the purchased EVK.
Obtain the document byclicking the [User’s Guide]
button in Step 4.

Back

What is the ROHM Solution Simulator?

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Using the ROHM Solution Simulator
Utilizing the solutions provided by ROHM

s

Tools
Simulation tool you can run on the website

Functional
designProduct
selection

Can verify the designs using circuits close to applications

CircuitdesignSimulation

System-Level Simulation

Pre-Prototype
evaluation
Solution board
available

Can select from an extensive range of solution circuits,
including mainly power devices and gate drivers

High reproducibility of simulations achieved by incorporatinghigh precision SPICE models. Coordination with certain
evaluation boards

Information

ROHM
Solution
Simulator

PrototypesystemBoard
evaluation

Systemevaluation

From the steps for selecting parts and considering the validity of circuits, system level
simulations can be repeatedly performed for analysis. Therefore, critical problems areless likely to occur after a trial, reducing the number of retrials and the hours fordevelopment.

Next page

Exportable to external simulators. Can be developed tocustomer’s simulator circuits

Provides solution circuits suited for various applications
Advanced power devices(SiC, etc.)

Driver IC and peripheral parts(Gate drivers, etc.)

Simulation circuit diagrams cover various power electronics applications

Power electronics applications
Traction
InverterPage 1 / 2

On/Off board
chargerPV
InverterServer,Base stationHome
appliances

To realize the maximum potential of power devices,know-how for tuning between parts is required

Function block
AC/DC
Converter

While tuning, ideal circuit parameters

DC/DC
Inverter

DC/DC
Converter

Battery
Management

PMICs for
ECUs

Circuit topologies provided by ROHM

can be derived
Totem pole
PFC
© 2022-2024 ROHM Co., Ltd.

Mass
production

Next pagei

Prototypeboard

ViennaRectifier

Full/Half
BridgeLLC
Resonant

Flyback

Boost

Current
MonitoringBack

What can be done with the ROHM Solution Simulator
Step 3:

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s

www

Tools

Step 1:wwwSelect a solution circuit

Step 4:

Perform simulations and monitor results

Order samples

You can set and operate simulations intuitively. After
performing simulations, you can check the results easily
with the powerful waveform analysis tool.

You can purchase samples for trial evaluation andevaluation boards via the links of the distribution partners
shown in the circuit diagrams.

Select a solution circuit suited for theapplication from the solution circuit listi

Information

ROHM
Solution
Simulator

Previous page

Previous page

Page 2 / 2© 2022-2024 ROHM Co., Ltd.

Step 2:

Step 5:

Select devices and change values

Expand circuits in an external environment

The simulation screen is displayed. The constants recommended by
ROHM have been entered in advance. Use these as base values foradjusting the parameters.

In addition to adjusting the parameters, you can export the circuit data to
PartQuest Explore to expand system circuits and develop original circuits bychanging the circuit types or adding different circuits.

Back

Design calculation tool
What is the Calculation Sheet?

How to obtain the Calculation Sheet

Step 1:
Display the product page of the product name you want.

TOP

s

Tools
ROHM has published the Calculation Sheet that assists
you in designing peripheral circuits for DC-DC and AC-DC
converter ICs.
The Calculation Sheet is a design tool for application
circuits based on the method of selecting parts describedin product data sheets. Since the tool is equipped withcalculation formulas required for determining the peripheral
parts and other tasks, you can easily determine the circuit

Next page

parameters that satisfy desired characteristics by settingThis tool is provided in a Microsoft Excel file format.

Step 2:

Information

Click “Tools”.

DC-DC converter

Page 1 / 5

Automatically calculates the theoretical equation for the
peripheral circuit design described in the data sheet,
and automatically judges whether or not the value is
within the setting range
Outputs the BOM list and summary sheet of the design
resultAC-DC converter
Can calculate coils, transformers, and other peripheral
parts of flyback converters and buck converters
Main components, including IC and peripheral parts
such as Schottky barrier diodes, fast recovery diodes,
electrolytic capacitors, and transformers, are compiled
into a database, allowing you to sort the parts andselect them on the spot.
© 2022-2024 ROHM Co., Ltd.

Step 3:ScrollCalculation
Sheet

Scroll down and look for“CALCULATION TOOLS”. Clicking thefile name downloads the tools to yourcomputer. The tools are not available if
the “CALCULATION TOOLS” section is
not displayed.

Next pageivalues according to the instructions.

Back

How to use

TOPs

Step 1:Tools

The cells are color-coded according to their functions.
The yellow cells are for selecting or inputting values. The
blue cells display the calculation results. The gray cells
display the setting values on the data sheet.

Step 2:
If the Calculation Sheet supports the seriesof models, selecting a product automaticallysets the relevant entries such asrecommended operation conditions.

Information

Calculation
Sheet
Page 2 / 5© 2022-2024 ROHM Co., Ltd.

Next page

Next pagei

Previous page

Previous pageHow to use (continued)

Back
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Step 4:s

Tools

Step 3:
The Calculation Sheetprovides calculation formulas
and instructions on how todetermine values.

Information

Calculation
Sheet
Page 3 / 5© 2022-2024 ROHM Co., Ltd.

Next pagei

It is also easy to make changes repeatedly.

Next page

Previous page

Previous page

Entering values according to the data sheet
and the instructions updates the entire
calculation result immediately.

How to use (continued)

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TOP

Using the Calculation Sheet prevents overlooking the design constraints and allows you to select parts
that satisfy the operating conditions.

s

Tools

Step 6:
Step 5:
If an input value is outside theworking range, the tool outputs
an error message and urges
you to correct the value.

Information

Calculation
Sheet
Page 4 / 5© 2022-2024 ROHM Co., Ltd.

Next pagei

Next page

Previous page

Previous page

Judges the calculation result and reports
the results If the calculation result does notcomply with the specifications, review andreset the input values.

How to use (continued)

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TOP

A summary sheet showing the design result is prepared. You can use it directly in the design report.

s

Tools

Step 7:i

Information

Calculation
Sheet

Previous page

Previous page

Displays theparts constantsof theapplication
circuit.

Page 5 / 5

Step 8:
Displays the list ofdesign values,
including thecharacteristic values.

© 2022-2024 ROHM Co., Ltd.

Back

How to obtain application notes (various technical documents)
Obtain through one of the following methods:

TOP
Step 3: The “Documents” section shows documents highly relevant to this product name. The“Technical Articles” section shows documents related to this product name. With the“Search” feature on the upper right of the display, you can easily search for
document titles.

s

Tools

Next page

ScrollInformation

Application
Note
Page 1 / 2© 2022-2024 ROHM Co., Ltd.

Step 2:Below the “Design Resources” section,
various technical documents are shown.

Next pagei

How to obtain application notes (various technical documents) (continued)

Back
TOP

s

Method 2. Using keywords to search through the website
Tools
Step 1: From the home page, access the document search page.

Step 2: Entering a keyword into the “Search” area on the left side of the screen displays theresults in a window on the right. Do not confuse the area with the search field on theupper right of the display. With the default setting, all documents and design models
including data sheets are targets of the search. As a result, many unnecessary
results may be displayed, hiding necessary information.
In such a case, select the type of documents in the list on the left. This displays
filtered results. In case of application notes, they may be contained in different
categories, such as Schematic Design or Thermal Design. Select the categories
sequentially.

iInformation

Application
Note
Page 2 / 2© 2022-2024 ROHM Co., Ltd.

Previous page

Previous page

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How to obtain design models

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s

Tools

The design models include the following. Different models are provided depending on the
product names.

Step 2: “MODELS” is located below the “Tools” section. Models for electrical and thermal
simulations are provided. Click the necessary items to download them.

Electrical simulation models for IC-

PSpice Model: encrypted model file for PSpice.

-

Unencrypted SPICE Model: unencrypted model file.

-

Spice Modeling Report: modeling report for models listed above.

Electrical simulation models for discrete devices
SPICE Model: unencrypted model file.

-

SPICE Thermal Model: thermal model to be used by electrical simulators.

-

PLECS Model: model file for PLECS.

Next pageFor thermal simulations

Information-

Tow-Resistor Model Report: document describing the values of the two-resistor model.

DesignModel

Step 1: Display the product page of the product name you want and scroll down the page.

ScrollPage 1 / 2© 2022-2024 ROHM Co., Ltd.

Next pagei-

How to obtain design models (continued)

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s

How to obtain Unencrypted SPICE Model

Step 3: When the “Contact us” form is displayed, enter the required details and click the[Submit] button.

Tools
Step 1: Click “Unencrypted SPICE Model (Inquiry Form)”.

Click

Previous page

Information

DesignModelPrevious pagei

Step 2: Read the licensing agreement. If you accept, check “I accept the License Agreement.” andclick the [OK] button.

Page 2 / 2

Check

Step 4: The URL and password for download are sent to the email address entered. Follow
the procedure described in the email to obtain the SPICE Model.
© 2022-2024 ROHM Co., Ltd.

Back

How to obtain package information

TOP

s

Tools

The package information contains the following details.
-

Package Structure-

Packing Specification-

Footprint dimensions-

Marking Specification-

Storage conditions-

Soldering conditions

Step 1: Display the product page of the product name you want. Clicking the package name displays the
package information.

iInformation

Package
Information
Page 1 / 1© 2022-2024 ROHM Co., Ltd.

Click

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How to obtain PCB library data

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s

Tools

The PCB library data (.bxl file) is neutral CAD data independent of CAD tools.
You can import this file into Ultra Librarian® Free Reader and export symbols and footprints in a specific
CAD tool format.
Ultra Librarian® Free Reader supports 30 types of CAD formats and more.

i-

Accel EDA 14 & 15
Altium 6 to current version
Autodesk Fusion 360
Cadence Allegro
DesignSpark
Eagle Libraries
KiCad
Mentor Graphics
BoardStation
Mentor Graphics Design Architect

Mentor Graphics Design
Expedition 99 and 2000
OrCAD 9.X PCB and Capture
PADS PowerPCB 3, 3.5, 4.X, and 5.X
PADS PowerPCB and PowerLogic 3.0
PCAD 2000, 2001, 2002, 2004, and 2006
Pulsonix 8.5 or newer
STL-

3D STEPTARGET 3001!
View Logic ViewDraw
Quadcept
Zuken CadStar 3 and 4
Zuken CR-5000 and CR-8000
Zuken eCADSTAR 2020 and 2021

Step 2: “2D/3D/CAD” is located below “Tools”. Clicking “Footprint /Symbol” starts
downloading the library.

Information

PCB
Library

Step 1: Display the product page of the product name you want and scroll down the page.

ScrollPage 1 / 1© 2022-2024 ROHM Co., Ltd.

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How to obtain 3D models

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s

Tools

The 3D package model data representing the 3D outline images of electronic components isprovided as a STEP (Standard for the Exchange of Product data) file. The STEP files comply
with the international standard, ISO 10303. They can be imported into many CAD systems. In
addition, they are saved in the text format so that various CAD systems can interpret them. The
data published on the website are outline models in which internal structures cannot be viewed.

Step 1: Display the product page of the product name you want and scroll down the page.

i

Information

3D ModelScrollPage 1 / 1© 2022-2024 ROHM Co., Ltd.

Step 2: “2D/3D/CAD” is located below “Tools”. Clicking “3D STEP Data” starts downloading
the model.

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Simulation Circuit
Select a circuit to be simulated

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s

Tools

Switching Regulator ICs : Automotive
Part number

IOUT
[A]

Simulation Circuit
VIN [V]

BD9P105EFV-C

0.8 to 8.5

BD9P105MUF-C
BD9P135EFV-C
BD9P135MUF-C

1

3.5 to 40

BD9P155EFV-C

BD9P205EFV-C

0.8 to 8.5

Page 1 / 4© 2022-2024 ROHM Co., Ltd.

BD9P235EFV-C
BD9P235MUF-C

2

3.5 to 40

BD9P255EFV-C

3.3

5.0

BD9P255MUF-C

PackageFrequency
Response

Start Up

Load
ResponseLine
Response

HTSSOP-B20

Online-OnlineOnlineVQFN20FV4040

Online-OnlineOnlineHTSSOP-B20

Online-OnlineOnlineVQFN20FV4040

Online-OnlineOnlineHTSSOP-B20

Online-OnlineOnlineVQFN20FV4040

Online-OnlineOnlineHTSSOP-B20

Online-OnlineOnlineVQFN20FV4040

Online-OnlineOnlineHTSSOP-B20

Online-OnlineOnlineVQFN20FV4040

Online-OnlineOnlineHTSSOP-B20

Online-OnlineOnlineVQFN20FV4040

Online-OnlineOnlineVQFN24FV4040

Online---VQFN24FV4040

Online---VQFN24FV4040

Online---

BD9P108MUF-C

1

BD9P208MUF-C

2

BD9P308MUF-C

3

BD9P608MFF-C

6

VFN20FV4535

Online---

BD9S200MUF-C

2

VQFN16FV3030

Online---

BD9S300MUF-C

3

VQFN16FV3030

Online---

BD9S400MUF-C

4

VQFN16FV3030

Online---

BD9S201NUX-C

2

2.7 to 5.5

0.8 to 5.5

VSON008X2020

Online---

BD9S402MUF-C

4

2.7 ～ 5.5

0.6 ～ 4.125

VQFN16FV3030

Online---

BD9G201(U)EFJ-M

1.5

Online

-

-

-

3.5

0.8 to 42

HTSOP-J8ES

BD9G401(U)EFJ-M

4.5 to 42

HTSOP-J8ES

Online---3.5 ～ 40

2.7 to 5.5

0.8 ～ 8.5

0.8 to 4.4

Next page

Next pageBD9P205MUF-C

ROHM
Solution
Simulator

3.3

5.0

BD9P155MUF-C

Catalog

VOUT [V]Information

For the latest lineup of
simulation circuits,
check our website.

www

www

Simulation Circuit (Continued)

Back

Select a circuit to be simulatedTOPs

Switching Regulator ICs : Automotive (Continued)

Tools

IOUT
[A]

VIN [V]

VOUT [V]BD8P250MUF-C

2

3.5 to 36

5.0BD90610EFJ-C

1.25

BD90620EFJ-C
BD90620HFP-C
Previous pageBD90640EFJ-C
BD90640HFP-C

Page 2 / 4

BD8P250MUF-C+ BD90302NUF-C

3.5 to 36

0.8 to 36

42

2.7 to 36

5.0Frequency
Response

Start Up

Load
ResponseLine
Response

VQFN24FV4040

Online---HTSOP-J8

OnlineOnline--HTSOP-J8

OnlineOnline--HRP7

OnlineOnline--HTSOP-J8

OnlineOnline--HRP7

OnlineOnline--VQFN24FV4040+ VSON10FV3030

Online---Next page

Switching Regulator ICs : Industrial
Simulation Circuit

Part number

IOUT
[A]

VIN [V]

VOUT [V]BD9A201FP4-LBZ

2

2.7 to 5.5

0.8 to 3.85

TSOT23-8L

1.0 to 25.2

SOP-J8

1.0 to 25.2

HTSOP-J8

1.0 to 28.8

BD9E100FJ-LB
BD9E101FJ-LB
BD9E300EFJ-LB
BD9E301EFJ-LB© 2022-2024 ROHM Co., Ltd.

2.5

Package

Next page

ROHM
Solution
Simulator

Previous page

Catalog

Simulation Circuit

Part number

1

2.5

7.0 to 36

PackageFrequency
Response

Start Up

Load
ResponseLine
Response

ThermalOnline----Online----Online----Online----Online----HTSOP-J8

Online----TSOT23-8L

Online

-

-

-

-

SSOP6

Online----

BD9E303EFJ-LB

3

BD9E304FP4-LBZ

3

4.5 to 36

0.7 to 28

BD9G102G-LB

0.5

6.0 to 42

0.75 to 33.6

BD9G201(U)EFJ-LB

1.5

4.5 to 42

0.8 to 42

HTSOP-J8ES

Online----

BD9G341AEFJ-LB

3

12 to 76

1.0 to 76

HTSOP-J8

Online-OnlineOnline-

BD9G500EFJ-LA

5

7.0 to 76

1.0 to 68.4

HTSOP-J8

Online---OnlineBD9615MUV-LB-

3.5 ～ 60-

VQFN16KV3030

Online----Information

For the latest lineup of
simulation circuits,
check our website.

www

www

Simulation Circuit (Continued)

Back

Select a circuit to be simulatedTOPs

Switching Regulator ICs : Standards

Tools

Previous page

VIN [V]

VOUT [V]BD9A300MUV

3

2.7 to 5.5

0.8 to 3.85

BD9D300MUV

3

4.0 to 17

BD9E104FJ

1

BD9E105FP4-Z

PackageFrequency
Response

Start Up

Load
ResponseLine
Response

VQFN016V3030

Online---0.9 to 5.25

VQFN016V3030

Online---

7.0 to 26

1.0 to 13

SOP-J8

Online---1

4.5 ～ 28

0.7 ～ 22

TSOT23-6L

Online---

BD9E200FP4-Z

2

4.5 to 26

0.7 to 20.8

TSOT23-6L

Online-Online-

BD9E201FP4-Z

2

4.5 to 28

0.7 to 22

TSOT23-6L

Online-Online-

BD9E202FP4-Z

2

4.5 ～ 28

0.7 ～ 22.4

TSOT23-6CJ

Online-Online-

BD9E302EFJ

3

7.0 to 28

1.0 to 19.6

HTSOP-J8

Online---BD9F500QUZ

5

4.5 to 36

0.6 to 14

VMMP16LZ3030

Online---

BD9F800MUX-Z

8

4.5 to 28

0.765 to 13.5 VQFN11X3535A

Online---BD9611MUV-

10 ～ 56

Online---1.0 ～ 44.8

VQFN020V4040

Next page

Next page

ROHM
Solution
Simulator

Previous page

Catalog

Simulation Circuit

IOUT
[A]

Part number

Page 3 / 4

Information

For the latest lineup of
simulation circuits,
check our website.

www

www

© 2022-2024 ROHM Co., Ltd.

Simulation Circuit (Continued)

Back

Select a circuit to be simulatedTOPsLinear Regulators : Automotive

Tools

Part number
BD433M2EFJ-C
BD433M2FP3-C
BD433M5FP-C
BD433M5FP2-C
Previous page

BD450M2EFJ-C
BD450M2FP3-C

Catalog

Page 4 / 4Previous page

ROHM
Solution
Simulator

BD450M5FP-C

Simulation Circuit

IOUT
[A]

VIN [V]

0.2

3.9 to 42
3.3

0.5

4.0 to 42

0.2

5.5 to 42
5.0

0.5

5.5 to 42

BD733L2EFJ-C

0.2

4.37 to 45

BD733L5FP-C

0.5

4.17 to 45

BD750L2EFJ-C

0.2

5.8 to 45

BD750L5FP-C

0.5

5.6 to 45

BD450M5FP2-C

VOUT [V]3.3

5.0

BD933N1G-C
4.5 to 42

BD933N1EFJ-C

BD950N1G-C

ThermalHTSOP-J8

OnlineOnlineOnlineSOT223-4F

OnlineOnline-TO252-3

OnlineOnlineOnlineTO263-3

OnlineOnlineOnlineHTSOP-J8

OnlineOnlineOnlineSOT223-4F

OnlineOnline-TO252-3

OnlineOnlineOnlineTO263-3

OnlineOnlineOnlineHTSOP-J8

OnlineOnline-TO252-3

OnlineOnline-HTSOP-J8

OnlineOnline-TO252-3

OnlineOnline-OnlineOnlineOnlineOnlineOnlineOnlineOnlineOnlineOnlineOnlineOnlineOnlineOnlineOnlineOnlineOnlineOnlineOnlineOnlineOnlineOnlineOnlineOnlineOnlineOnlineOnline-OnlineOnline

-

3.3

0.15
SSOP5
6.0 to 42

BD950N1EFJ-C

5.0
HTSOP-J8

BD950N1WEFJ-C

BD80C0AWFP-C

Line
Response

HTSOP-J8

BD950N1WG-C

BD00C0AWFP-C

Load
Response

SSOP5

BD933N1WG-C

BD933N1WEFJ-C

Package

1

4.0 to 26.5

1.0 to 15
8.0TO252-5

Information

For the latest lineup of
simulation circuits,
check our website.

www

www

© 2022-2024 ROHM Co., Ltd.

Back
TOP

Application Note
A. Linear Regulators

s

Tools

A-1. Circuit Design
Online Browsing

Catalog

Page 1 / 10

Title

Online Browsing

Title[EN] [JP] [CN] [KR]Basics of Linear Regulators[EN] [JP] [CN]What Is Thermal Design?

[EN] [JP] [CN]Linear Regulator Specifications[EN] [JP] [CN]Basics of Thermal Resistance and Heat Dissipation[EN] [JP]Table of resistance for output voltage setting on linear regulator ICs[EN] [JP] [CN] [KR]Thermal resistance and thermal characterization parameter[EN] [JP]Reverse Voltage Protection[EN] [JP] [CN]

θJA and ΨJT[EN] [JP]Power Source ON/OFF Characteristics for Linear Regulator[EN] [JP] [CN]θJC and ΨJT[EN] [JP]Connecting LDOs in Parallel[EN] [JP] [CN][EN] [JP]Problem Situations: Power Supply Does Not Start

How to Use the Thermal Resistance and Thermal Characteristics
Parameters[EN] [JP]BAxxCC0 Series Circuit Using a Ceramic Output Capacitor[EN] [JP] [CN]Judgment Criteria of Thermal Evaluation[EN] [JP]Suppression Method of Switching Noise Using Linear Regulator and
Low Pass Filter[EN] [JP]Thermal Design for Three-Terminal Voltage Regulators[EN] [JP]Thermal Calculation for Linear Regulator

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Application
Note

A-2. Thermal Design[EN] [JP] [CN] [KR]Impedance Characteristics of Bypass Capacitor[EN] [JP] [CN]Two-Resistor Model for Thermal Simulation[EN] [JP] [CN]How to Select Reverse Current Protection Diodes for LDO Regulators[EN] [JP]How to Use the Two-Resistor Model[EN] [JP] [CN]Method for Calculating Junction Temperature from Transient
Thermal Resistance Data

[EN] [JP] [CN]Calculating Junction Temperature from Inrush Current[EN] [JP] [CN]Solder Joint Rate and Thermal Resistance of Exposed Pad

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A. Linear Regulators (Continued)

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Tools

A-3. Simulation

A-7. Thermal Measurement

Online Browsing[EN] [JP]Title

Online Browsing

Usage of SPICE MacroModel (for LDO)

A-4. EMC
Online Browsing

Previous page[EN] [JP] [CN]Title

[EN] [JP]Notes for Temperature Measurement Using Thermocouples[EN] [JP]Notes for Temperature Measurement Using Forward Voltage of PN Junction[EN] [JP] [CN] [KR]Precautions When Measuring the Rear of the Package with a Thermocouple

Title

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EMC Measures for LDOs

Page 2 / 10

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Application
Note

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CatalogA-5. PCB Design
Online Browsing

Title[EN] [JP] [CN]Design Guide and Example of Stencil for Exposed Pad[EN] [JP] [CN]PCB Layout Thermal Design Guide[EN] [JP] [CN]Heat Dissipation Effect of Thermal Via in Exposed Pad Type Package

A-6. Evaluation
Online Browsing© 2022-2024 ROHM Co., Ltd.

Title

[EN] [JP]Measurement Method for Phase Margin with Frequency Response Analyzer (FRA)[EN] [JP]Simple Test Method for Estimating the Stability of Linear Regulators[EN] [JP]Problem Situations: Power Supply Does Not Start

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A. Linear Regulators (Continued)

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A-8. Design Data
Part number

BA

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Page 3 / 10

Reference Circuit

Dropout Voltage
Design reference values

Typical Performance
CurvesBA178xx series[EN] [JP]‐[EN] [JP][EN] [JP]BA178Mxx series[EN] [JP]‐[EN] [JP][EN] [JP]BA1117 series[EN] [JP]‐[EN] [JP]‐BAxxBC0 series[EN] [JP]‐[EN] [JP][EN] [JP]BAxxCC0 series[EN] [JP]‐[EN] [JP][EN] [JP]BAxxDD0 series[EN] [JP]‐[EN] [JP][EN] [JP]BAxxJC5 series‐‐[EN] [JP]‐BDxxGC0 series[EN] [JP][EN] [JP][EN] [JP]‐BDxxGA5 series[EN] [JP][EN] [JP][EN] [JP]‐BDxxGA3 series[EN] [JP][EN] [JP][EN] [JP]‐BDxxHC5 series[EN] [JP][EN] [JP][EN] [JP]‐BDxxHC0 series[EN] [JP][EN] [JP][EN] [JP]‐BDxxHA5 series[EN] [JP][EN] [JP][EN] [JP]‐BDxxHA3 series[EN] [JP][EN] [JP][EN] [JP]‐BDxxIC0 series[EN] [JP][EN] [JP][EN] [JP]‐BDxxIA5 series[EN] [JP][EN] [JP][EN] [JP]‐BDxxKA5 series[EN] [JP][EN] [JP][EN] [JP]‐[EN] [JP]BD00D0A series‐‐[EN] [JP]‐‐Information

BD00EA5 series‐‐[EN] [JP]‐‐BDxxFC0 series‐[EN] [JP][EN] [JP]‐[EN] [JP]BDxxFD0 series‐‐[EN] [JP]‐‐For new titles, checkthe product pages andthe document search
page.

[EN] [JP][EN] [JP]Next page[EN] [JP]BD© 2022-2024 ROHM Co., Ltd.

PCB Layout

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Note

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Catalog

Application Information
Provides hints for IC mounting[EN] [JP]Application Note

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A-8. Design Data (Continued)
Part number

BD
Previous page

BU

Page 4 / 10

Dropout Voltage
Design reference values

Typical Performance
Curves

PCB Layout

BDxxC0A series‐[EN] [JP]‐‐BDxxD0A series‐[EN] [JP]‐‐BDxxFA1MG-M series[EN] [JP]‐[EN] [JP]‐BDxxFA1FP3 series[EN] [JP]‐[EN] [JP]‐BD35395FJ

‐

‐

‐

‐

[EN] [JP]BUxxJA2MNVX-C series‐‐[EN] [JP]‐[EN] [JP]BUxxJA2DG,VG series‐‐[EN] [JP]‐‐BUxxTD2 series‐‐[EN] [JP]‐[EN] [JP]BUxxTD3 series[EN] [JP]‐[EN] [JP]‐[EN] [JP]BUxxSA4 series‐‐[EN] [JP]‐[EN] [JP]BUxxSA5 series‐‐[EN] [JP]‐[EN] [JP]BUxxTA2 series‐‐[EN] [JP]‐[EN] [JP]BUxxSD2 series‐‐[EN] [JP]‐[EN] [JP]BUxxSD5 series‐‐[EN] [JP]‐[EN] [JP]BHxxM0A series

‐

‐

‐

‐

[EN] [JP]BHxxMA3 series

‐

‐

‐

‐

[EN] [JP]BHxxNB1 series

‐

‐

‐

‐

[EN] [JP]BHxxPB1 series

‐

‐

‐

‐

[EN] [JP]Information

BHxxRB1 series

‐

‐

‐

‐

[EN] [JP]BHxxSA3 series

‐

‐

‐

‐

[EN] [JP]For new titles, checkthe product pages andthe document search
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BH

© 2022-2024 ROHM Co., Ltd.

Reference Circuit[EN] [JP][EN] [JP]Next page

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Note

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Application Information
Provides hints for IC mounting

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[EN] [JP] [CN]TO252 Package Thermal Resistance Information[EN] [JP] [CN]HTSOP-J8 Package Thermal Resistance Information[EN] [JP]Thermal Resistance Data: TO220CP-V5[EN][JP]

Thermal Resistance Data: TO263-5 (BD4xxM5WFP2-C)[EN] [JP]Thermal Resistance Data: SSOP5 (BUxxJA2DC-C, VG-C)[EN] [JP]Thermal Resistance Data: SSOP5 (BUxxJA3DC-C)[EN] [JP]Thermal Resistance Data: SSOP5 (BUxxTD3WG)[EN] [JP]Thermal Resistance Data: SSOP5 (BD7xxL05G-C)[EN] [JP]Thermal Resistance Data: SSOP5 (BD9xxN1G-C)[EN] [JP]Thermal Resistance Data: VSON008X2030 (BDxxGA3WNUX)[EN] [JP]Thermal Resistance Data: HVSOF6 (BD00IA5MHFV-M)[EN] [JP]Thermal Resistance Data: SSON004X1010 (BUxxTD2WNVX)[EN] [JP]Thermal Resistance Data: HRP7 (BD8374HFP LED driver) [Reference data]

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B. Switching Regulator ICs

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Page 6 / 10

Title

[EN] [JP] [CN]Precautions When Measuring the Rear of the Package with a
Thermocouple[EN] [JP] [CN]Capacitor Calculation for Buck converter IC[EN] [JP] [CN]The Important Points of Multi-layer Ceramic Capacitor Used in Buck
Converter circuit[EN] [JP] [CN]Online Browsing

Title[EN] [JP] [CN]What Is Thermal Design?

[EN] [JP] [CN]Basics of Thermal Resistance and Heat Dissipation[EN] [JP] [CN] [KR]Thermal resistance and thermal characterization parameter[EN] [JP] [CN]

θJA and ΨJT

Calculation of Power Loss (Synchronous)[EN] [JP] [CN]θJC and ΨJT[EN] [JP] [CN]Considerations for Power Inductors Used for Buck Converters[EN] [JP] [CN]How to Use the Thermal Resistance and Thermal Characteristics
Parameters[EN] [JP] [CN]Snubber Circuit for Buck Converter IC[EN] [JP] [CN]Judgment Criteria of Thermal Evaluation[EN] [JP] [CN]Efficiency of Buck Converter[EN] [JP] [CN]Two-Resistor Model for Thermal Simulation[EN] [JP] [CN] [KR]Phase Compensation Design for Current Mode Buck Converter[EN] [JP]How to Use the Two-Resistor Model[EN] [JP]Bootstrap Circuit in the Buck Converter[EN] [JP] [CN][EN] [JP] [CN]Method for Determining Constants of Peripheral Parts of Buck DC/DC
Converter

Method for Calculating Junction Temperature from Transient
Thermal Resistance Data

[EN] [JP] [CN]Solder Joint Rate and Thermal Resistance of Exposed Pad[EN] [JP] [CN]Resistor Value Table to set Output Voltage of Buck Converter IC[EN] [JP] [CN]HTSOP-J8 Package Thermal Resistance Information[EN] [JP]Power Supply Sequence Circuit with General Purpose Power Supply IC[EN] [JP] [CN]TO252 Package Thermal Resistance Information[EN] [JP]Suppression Method of Switching Noise Using Linear Regulator and
Low Pass Filter[EN] [JP] [CN] [KR]Impedance Characteristics of Bypass Capacitor[EN] [JP]Types of Capacitors Used for Output Smoothing of Switching
Regulators and their Precautions[EN] [JP]

Diode Selection Method for Asynchronous Converter

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CatalogB-2. Thermal Design

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B. Switching Regulator ICs (Continued)

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B-3. Simulation

B-6. Evaluation

Online Browsing[EN] [JP] [CN] [KR]

Title
Usage of SPICE MacroModel (for DC/DC)

B-4. EMC
Online Browsing

Previous page

Design and Application Considerations of Input Filter to reduce
Conducted Emissions caused by DC/DC converter[EN]

Considerations for Power Inductors: How Flux Orientation Can
Reduce Radiated Emission

Page 7 / 10

Previous page[EN] [JP]Measurement Method for Phase Margin with Frequency Response
Analyzer (FRA)[EN] [JP] [CN]Method for Monitoring Switching Waveform[EN] [JP] [CN] [KR]Calculation of Power Dissipation in Switching Circuit[EN] [JP] [CN] [KR]Calculating Power Loss from Measured Waveforms[EN] [JP] [CN] [KR]Importance of Probe Calibration When Measuring Power: Deskew

Next pageB-7. Thermal Measurement

Precautions for PCB Layout Regarding Common Mode Filters
Online Browsing

B-5. PCB Design
Online Browsing© 2022-2024 ROHM Co., Ltd.

[EN] [JP]Next page

Application
Note

Title

Title

[EN] [JP]Catalog

Online Browsing

Title

Title

[EN] [JP]Notes for Temperature Measurement Using Thermocouples[EN] [JP]Notes for Temperature Measurement Using Forward Voltage of PN
Junction[EN] [JP] [CN] [KR]Precautions When Measuring the Rear of the Package with a
Thermocouple[EN] [JP] [CN] [KR]PCB Layout Techniques of Buck Converter[JP]

PCB Layout Techniques of Boost Converter[EN] [JP]PCB Layout Essential Check sheet for Switching Regulator[EN] [JP] [CN]Design Guide and Example of Stencil for Exposed Pad[EN] [JP] [CN]PCB Layout Thermal Design Guide

Information[EN] [JP] [CN]Heat Dissipation Effect of Thermal Via in Exposed Pad Type Package

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B. Switching Regulator ICs (Continued)

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Part number

s

Tools

B-8. Design Data
Part number

Reference Circuit

PCB Layout

BD9A100MUV

BD9Exxx
series[EN] [JP]BD9A101MUV-LB
BD9Axxx
seriesPrevious page[EN] [JP]BD9A400MUV[EN] [JP]BD9A600MUV[EN] [JP]BD9B100MUV[EN] [JP]BD9B200MUV[EN] [JP]BD9Fxxx
seriesBD9Bxxx
seriesBD9Cxxx
seriesBD9Dxxx
series[EN] [JP]BD9B500MUV[EN] [JP]BD9B600MUV[EN] [JP]BD9C301FJ[EN] [JP]BD9C401EFJ[EN] [JP]BD9C501EFJ[EN] [JP]BD9C601EFJ[EN] [JP]BD9D320EFJ[EN] [JP]BD9D321EFJ[EN] [JP]BD9E101FJ[EN] [JP]BD9E104FJ‐

BD9E300EFJ[EN] [JP]BD9E301EFJ[EN] [JP]BD9E302EFJ[EN] [JP]‐BD9E303EFJ[EN] [JP][EN] [JP]BD9F800MUX[EN] [JP]‐[EN] [JP]Next pageBD9G201EFJ-M[EN] [JP]‐BD9G341AEFJ[EN] [JP]‐BD9G401EFJ-M[EN] [JP]‐BD9106FVM[EN] [JP]‐BD9130NV[EN] [JP]‐BD9137MUV[EN] [JP]‐BD9139MUV[EN] [JP]‐BD9141MUV[EN] [JP]‐BD9611MUV[EN] [JP]‐BD9851EFV[EN] [JP]‐BD70522GUL[EN] [JP]‐BD95821NUV[EN] [JP]‐BD95831NUV[EN] [JP]‐BD95841NUV[EN] [JP]‐BD95861NUV[EN] [JP]‐Buck DC/DC Converter
Recommended Inductor List

[EN] [JP]BD9Gxxx
series[EN] [JP]others[EN] [JP][EN] [JP]‐[EN] [JP]BD9B400MUV[EN] [JP][EN] [JP][EN] [JP]BD9B301MUV

BD9E100FJ

BD9G101G

BD9B300MUVPage 8 / 10

© 2022-2024 ROHM Co., Ltd.

[EN] [JP]BD9A301MUV-LB

PCB Layout

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BD9A300MUVReference Circuit

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B-9. Thermal Resistance Data
Online Browsing

Title[EN] [JP] [CN]TO252 Package Thermal Resistance Information[EN] [JP] [CN]HTSOP-J8 Package Thermal Resistance Information

Previous page

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Catalog

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C. Power Devices

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CatalogC-3. Simulation
Title

Online Browsing

Title[EN] [JP] [CN]SiC Power Devices and Modules Application Note[EN] [JP]How to Create Symbols for PSpice Models[EN] [JP] [CN]Calculation of Power Dissipation in Switching Circuit[EN] [JP]How to Use LTspice Models[EN] [JP] [CN]Impedance Characteristics of Bypass Capacitor[EN] [JP]How to Use LTspice Models: Tips for Improving Convergence[EN] [JP] [CN]Gate-Source Voltage Behavior in a Bridge Configuration[EN] [JP] [CN] [KR]What is a Thermal Model?

[EN] [JP] [CN]Gate-Source Voltage Surge Suppression Methods[EN] [JP] [CN] [KR]How to Use Thermal Models[EN] [JP] [CN]SiC MOSFET Snubber Circuit Design Methods[EN] [JP] [CN]5 kW High-Efficiency Fan-less Inverter[EN] [JP] [CN]800 V Three-Phase Output LLC DC-DC Resonant Converter[EN] [JP] [CN]5 kW Inverter Circuit Using 4th Generation SiC MOSFETs[EN] [JP] [CN]4th Gen SiC MOSFETs Discrete Package: Characteristics andPrecautions for Circuit Design Application Note

C-4. Evaluation
Online Browsing

Title[EN] [JP] [CN]Precautions During Gate-Source Voltage Measurement[EN] [JP] [CN]Importance of Probe Calibration When Measuring Power: Deskew[EN] [JP] [CN]Calculating Power Loss from Measured Waveforms[EN] [JP] [CN]Design Method for Comparator-less Miller Clamp Circuits[EN] [JP] [CN]Basics and Design Guidelines for Gate Drive Circuits[EN] [JP] [CN]Oscillation Countermeasures for MOSFETs in Parallel[EN] [JP] [CN]Improvement of Switching Loss by Driver Source

C-5. Thermal Measurement[EN] [JP] [CN]Application Benefits of Using 4th Generation SiC MOSFETs

Online Browsing[EN] [JP] [CN] [KR]Title
Measurement Method and Usage of Thermal Resistance RthJC

C-2. Thermal Design
Online Browsing© 2022-2024 ROHM Co., Ltd.

Title

[EN] [JP] [CN]Notes for Calculating Power Consumption: Static Operation[EN] [JP] [CN]Example of Heat Dissipation Design for TO Packages: Effect ofHeat Dissipation Materials[EN] [JP] [CN]Precautions for Thermal Resistance of Insulation Sheet

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Notes
1) The information contained in this document is current as of July 11 th, 2024.
2) The information contained herein is subject to change without notice.
3) Although ROHM is continuously working to improve product reliability and quality, semiconductors 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 Products beyond the rating specified by ROHM.
4) 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.
5) 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 technicalinformation.
6) The Products are intended for use in general electronic equipment (i.e. AV/OA devices, communication, consumer systems, gaming/entertainment sets) as well as the applications indicated in thisdocument.
7) The Products specified in this document are not designed to be radiation tolerant.
8) 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.

9) Do not use our Products in applications requiring extremely high reliability, such as aerospace equipment, nuclear power control systems, and submarine repeaters.
10) ROHM shall have no responsibility for any damages or injury arising from non-compliance with the recommended usage conditions and specifications contained herein.
11) ROHM has used reasonable care to ensure the accuracy of the information contained in this document. However, ROHM does not warrant that such information is error-free and ROHM shall have no
responsibility for any damages arising from any inaccuracy or misprint of such information.
12) 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 as listed below. ROHM shall have no responsibility for any damages or losses resulting non-compliance with any applicable laws or regulations.
13) 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.

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

© 2022-2024 ROHM Co., Ltd.