Rohm BD9A100MUV User Manual

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Switching Regulator Series

Step-Down DC/DC Converter BD9A100MUV Evaluation Board

BD9A100MUV-EVK-001

Description

This evaluation board has been developed for ROHM’s synchronous buck DC/DC converter customers evaluating BD9A100MUV. While accepting a power supply of 2.7-5.5V, an output of 1.8V can be produced. The IC has internal 60m high-side N-channel MOSFET and 60m low-side N-channel MOSFET and a synchronization frequency is of 1MHz. A Soft Start circuit prevents in-rush current during startup. An EN pin allows for simple ON/OFF control of the IC to reduce standby current consumption. A MODE pin allows the user to select fixed frequency PWM mode or enables the Deep-SLLM control and the mode is automatically switched between the Deep-SLLM control and fixed frequency PWM mode. Include OCP (Over Current Protection) and SCP (Short Circuit Protection).

Evaluation Board Operating Limits and Absolute Maximum Ratings (Ta=25℃)

Parameter Symbol

MIN TYP MAX

Limit

Unit Conditions

Supply Voltage VCC 2.7 - 5.5 V

Output Voltage /

Current

Evaluation Board

- 1.8 - V

OUT

- - 1 A

OUT

Figure 1. BD9A100MUV-EVK-001 Evaluation Board

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DC Voltmeter 2

Load

Figure 2. Connection Diagram

Operation Procedures

1. Necessary equipments

(1) DC power-supply of 2.7V to 5.5V/1A

(2) Maximum 1A load

(3) DC voltmeter

2. Connecting the equipments

(1) DC power-supply presets to 5.0V and then the power output turns off.

(2) The max. load should be set at 1A and over it will be disabled.

(3) Check Jumper pin of SW1 is short, between intermediate-terminal and OFF-side terminal.

(4) Connect positive-terminal of power-supply to VIN+terminal and negative-terminal to GND-terminal with a pair of wires.

(5) Connect load’s positive-terminal to VOUT+terminal and negative-terminal to GND-terminal with a pair of wires.

(6) Connect positive-terminal of DC voltmeter 1 to TP1 and negative-terminal to TP2 for input-voltage measurement.

(7) Connect positive-terminal of DC voltmeter 2 to TP3 and negative-terminal to TP4 for output-voltage measurement.

(8) DC power-supply output is turned ON.

(9) IC is enable (EN) by shorting Jumper-pin of SW1 between intermediate-terminal and ON-side terminal.

(10) Check DC voltmeter 2 displays 1.8V.

(11) The load is enabled.

(12) Check at DC voltmeter 1 whether the voltage-drop (loss) is not caused by the wire’s resistance.

DC Voltmeter 1

DC Power

Enable-Pin

To minimize current consumption during standby-mode and normal operation, Enable-mode can be switched by controlling EN pin(15pin) of the IC. Standby-mode is enabled by shorting Jumper-pin of SW1 between intermediate-terminal and OFF-side terminal and normal-mode operation by shorting between intermediate-terminal and ON-side terminal.

It also can be swithed between standby-mode and normal-mode operation by removing Jumper-pin and controlling the voltage between EN and GND-terminal. Standby-mode is enabled when the voltage of EN is under 0.5V, and normal-mode operation when it is over 2.0V.

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BD9A100MUV-EVK-001

Cricuit Diagram

= 2.7V～5.5V, V

OUT

= 1.8V

BD9

100MUV

VIN

BOOT 13

SW 12 SW 11

SW 10

SS 9

ITH 7

Ｄ

ＡＰＥ

FB 6 7 1

TP6

TP5

TP7

TP3

C4 C 5 C6

TP4

C10

P G D

14 PGD

C1 C 2 C3

R 4

1PVIN 2PVIN

3PGND

4PGND

15 EN

8MODE 5AGND

VIN

G N D

TP 1

TP2

O FF

S W1

Figure 3. BD9A100MUV-EVK-001 Circuit Diagram

Bill of Materials

Reference

Count

Designator

2 C1, C7 Ceramic Capacitor 0.1µF 50V, B, ±10% GRM188B31H104KA92D MURATA 1608

1 C2 Ceramic Capacitor 10µF 16V, B, ±10% GRM31CB31C106KA88L MURATA 3216

0 C3 Ceramic Capacitor - Not installed - - 3216

2 C4, C5 Ceramic Capacitor 22µF 6.3V, B, ±20% GRM21BB30J226ME38L MURATA 2012

0 C6 Ceramic Capacitor - Not installed - - 2012

1 C8 Ceramic Capacitor 2700pF 50V, B, ±10% GRM188B11H272KA01D MURATA 1608

1 C9 Ceramic Capacitor 0.01µF 50V, B, ±10% GRM188B11H103KA01D MURATA 1608

0 C10 Ceramic Capacitor - Not installed - - 1608

1 L1 Inductor 2.2µH ±20%, DCR=17mmax, 8.1A FDSD0630-H-2R2M TOKO 7066

1 R1 Resis tor 30k 1/10W, 50V, ±1% MCR03EZPF3002 ROHM 1608

1 R2 Resis tor 24k 1/10W, 50V, ±1% MCR03EZPF2402 ROHM 1608

1 R3 Res istor 9.1k 1/10W, 50V, ±1% MCR03EZPF9101 ROHM 1608

1 R4 Resis tor 10k 1/10W, 50V, ±1% MCR03EZPF1002 ROHM 1608

2 R5, R7 Resistor 0 Jumper MCR03EZPJ000 ROHM 1608

0 R6 Resis tor - Not installed - - 1608

1 SW1 Pin header - 2.54mm × 3 contacts PH-1x03SG USECONN -

1 U1 IC - Buck DC/DC Converter BD9A100MUV ROHM VQFN016V3030

2 J1, J2 Terminal Block - 2 contacts, 15A, 14 to 22AWG TB111-2-2-U-1-1

1 - Jumper - Jumper pin for SW1 MJ254-6BK USECONN -

1 - PCB - FR4, 4-layer, 1oz EVK029 Rev.A Tamukai 50×50×1.6

Type Value Description

Manufacturer

Part Number

Manufacturer

Alphaplus

Connectors

& Cables

VOUT

GND

Configuration

(mm )

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BD9A100MUV-EVK-001

Layout (PCB size: 50mm×50mm×1.6mm)

Figure 4. Top Silk Screen (Top view)

Figure 5. Top Silk Screen and Layout (Top view)

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Figure 6. Top Side Layout (Top view)

Figure 7. L2 Layout (Top view)

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Figure 8. L3 Layout (Top view)

Figure 9. Bottom Side Layout (Top view)

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100

0.001 0.01 0.1 1

Efficiency (%)

Load Current (A) VIN=3.3V

VIN=5.0V

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

2 2.5 3 3.5 4 4.5 5 5.5 6

Output Voltage Change (%)

Input Voltage (V)

-0.5

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

0 0.2 0.4 0.6 0.8 1

Output Voltage Change (%)

Load Current (A) VIN=5.0V

Figure 10. Efficiency vs Load Current

Figure 11. Line Regulation

Figure 12. Load Regulation

Figure 13. Load Transient Characteristics

VO (AC) 50mV/div

IO: 0.5A/div

= 5.0V

VO = 1.8V

IO: 0A→1A→0A

Time scale 1ms/div

VO=1.8V

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-180

-135

-90

-45

135

180

-80

-60

-40

-20

1000 10K 100K 1M

Phase (deg)

Gain (dB)

Frequency (Hz)

Figure 14. Loop Response VIN = 5.0V, VO = 1.8V, IO = 1.0A

Phase

Gain

Figure 15. Input Voltage Ripple Wave

VIN = 5.0V, VO = 1.8V, IO=0A

Figure 16. Input Voltage Ripple Wave

VIN = 5.0V, VO = 1.8V, IO=1A

(AC)

50mV/div

Time scale 20ms/div

VSW 2V/div

Time scale 1μs/div

(AC)

50mV/div

VSW 2V/div

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Time scale 2ms/div

VO (AC) 20mV/div

VSW 2V/div

Figure 17. Output Voltage Ripple Wave

VIN = 5.0V, VO = 1.8V, IO=0A

Time scale 1μs/div

5V/div

EN 5V/div

VO 1V/div

Time scale 1ms/div

Figure 19. Start-up by EN

VIN = 5.0V, VO = 1.8V

Figure 20. Power-down by EN

VIN = 5.0V, VO = 1.8V

Figure 18. Output Voltage Ripple Wave

VIN = 5.0V, VO = 1.8V, IO=1A

VO (AC) 20mV/div

VSW 2V/div

5V/div

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Notes

The information contained herein is subject to change without notice.

Before you use our Products, please contact our sales representative and verify the latest specifications :

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 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 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 this document.

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.

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 ensur 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.

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. 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.

Notice

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ROHM Customer Support System

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

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Rohm BD9A100MUV User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual