Rohm BD9G101G Montage- und Bedienungsanleitung

ROHM Switching Regulator Solutions

Evaluation Board:

Step-down Switching Regulator

With Built-in Power MOSFET

BD9G101G (5V | 0.5A Output)

●Introduction

This application note will provide the steps necessary to operate and evaluate ROHM’s step-down switching regulator using the BD9G101G

evaluation boards. Board layout recommendations, operation procedures, application data and build of materials are provided.

●Description

This evaluation board has been developed for ROHM’s step-down switching regulator customers evaluating BD9G101G. While accepting a

wide power supply of 6-42V, a step down output of 1V-29V can be produced. The IC has an internal 800mohm Nch MOSFET (1A max) and

a fixed operating frequency range of 1.5MHz. A Soft Start circuit prevents in-rush current during startup along with UVLO (low voltage error

prevention circuit), OCP (over-current protection) and TSD (thermal shutdown detection) protection circuits. An EN pin allows for simple

ON/OFF control of the IC to reduce standby current consumption.

●Applications

Industrial distributed power applications

Automotive and battery powered equipment

●Evaluation Board Operating Limits and Absolute Maximum Ratings

Parameter

Symbol

Limit

Unit

Conditions

MIN

TYP

MAX

Supply Voltage

BD9G1010G

VCC

Output Voltage / Current

BD9G101G

VOUT

*Set by R1 and R2

BD9G101G

IOUT

0.5

●Evaluation Board

Below is the evaluation board with the BD9G101G. Component selection and board layout guidelines are provided in the

BD9G101G datasheet.

No.0000000015

BD9673EFJ Eval Board

BD9G101G Eval Board (Back)

GND

Vout

BD9G101G Eval Board (Front)

VOUT

VCC

GND

ENABLE

H: Active

(ICOFF)

L: Inactive

(ICON)

Application Note

Page 2of 8

●Evaluation Board Schematic

Below is the evaluation board schematic for BD9G101G.

●Evaluation Board I/O

Below is the reference application circuit that shows the inputs (Vcc and EN) and the output (Vout @ 5V/0.5A)

●Evaluation Board Operation Procedures

Below is the procedure to operate the evaluation board

1. Connect GND to a GND pin on the evaluation board

2. Connect Vcc to the VCC_pin. This will provide Vcc to the Vcc pin of the IC

i. Note: EN pin is pulled HIGH as default. EN needs to be set to LOW for IC operation.

3. Output voltage can be measured from the VOUT_pin on the evaluation board. Output current can be measured with a

proper load at VOUT.

L1: 10uH

10uH

Application Note

Page 3of 8

●Reference Graphs Application Data for BD9G101G

Below graphs show efficiency, frequency response and load characteristics of the BD9G101G eval board.

Application Note

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Application Note

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Application Note

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Note: Feed-forward capacitor Csp is not populated on the BD9G101G evaluation board. The capacitor is recommended

for designs requiring improved phase margin and transient response.

●Evaluation Board Layout Guidelines

Below are the guidelines that have been followed and recommended for BD9G101G designs.

Application Note

Page 7of 8

●Evaluation Board BOM

Below is a table with the build of materials. Part numbers and supplier references are provided.

Item

Qty

Ref

Description

Manufacturer

Part Number

Digikey P/N

CIN1

CAP CER 4.7UF 50V Y5V 1206

Murata

GRM31CF51H475ZA01L

490-1828-1-ND

CIN2

DIODE TVS 30V 400W UNI 5%

SMA

Littlefuse

SMAJ30A

SMAJ30ALFTR-ND

CO2

CAP CER 10UF 10V 10% X5R

1206

Murata

GRM31CR61A106KA01L

490-1820-2-ND

CBST

CAP CER 0.015UF 50V 10% X7R

0603

Murata

GRM188R71H153KA01D

490-1514-1-ND

DIODE SCHOTTKY 60V 2A PMDU

ROHM

RB060M-60TR

RB060M-60CT-ND

SW1

SWITCH SLIDE SPDT 30V.2A PC

MNT

E-Switch

EG1218

EG1903-ND

RES 68.0K OHM 1/8W 1% 0805

SMD

Yageo

RC0805FR-0768KL

311-68.0KCRCT-ND

RES 12.0K OHM 1/8W 1% 0805

SMD

Yageo

RC0805FR-0712KL

311-12.0KCRCT-ND

INDUCT 10uH SOD-106

TOKO

DEM4518C

1235AS-H-100M

5V, 0.5A Step-down SW Reg w/

FET

ROHM

BD9G101G

Application Note

Page 8of 8

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