Rohm Switching Regulator Series Manuale utente

1/10

No. 60AP001E Rev.001

2017.4

No. 60UG004E Rev.001

APR.2017

User’s Guide

Switching Regulator Series

Step-Down DC/DC Converter

BD9A301MUV-LB Evaluation Board

BD9A301MUV-EVK-001

BD9A301MUV-EVK-001 Evaluation board delivers an output 1.8 volts from an input 2.7 to 5.5 volts using BD9A301MUV-LB, a synchronous

rectification step-down DC/DC converter integrated circuit, with output current rating of maximum 3A. It offers high efficiency in all load ranges by

equipping the efficiency improvement function in light-load. The output voltage can be set by changing the external parts of circuit and the loop-

responsecharacteristicsalso can beadjustedbythephasecompensationcircuit.

Performance specification

Theseare representative values, and it is nota guaranteedagainstthe characteristics.

VIN = 5.0V,VOUT = 1.8V,Unlessotherwisespecified.

Parameter

Min

Typ

Max

Units

Conditions

Input VoltageRange

2.7

5.5

Output Voltage

1.8

R1=30kΩ, R2=24kΩ

Output VoltageSettingRange

0.8

VIN×0.7

Output CurrentRange

3.0

LoopBandWidth

89.1

kHz

Phase Margin

54.1

degrees

Input RippleVoltage

140

mVpp

IO= 3.0A

Output RippleVoltage

mVpp

IO= 3.0A

Output RisingTime

Operating Frequency

1.0

MHz

Maximum Efficiency

91.8

IO= 0.7A

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User’s Guide

BD9A301MUV-EVK-001

No. 60UG004E Rev.001

APR.2017

Operation Procedures

1. Necessary equipments

(1) DC power-supply of 2.7V to 5.5V/3A

(2) Maximum 3A 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 maximum load should be set at 3A 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.

Figure 1. Connection Diagram

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 switched 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.

−

DC Power

−

DC Voltmeter 1

DC Voltmeter 2

Load

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User’s Guide

BD9A301MUV-EVK-001

No. 60UG004E Rev.001

APR.2017

1 PVIN

3 PGND

15 EN

5 AGND

SW 12

ITH 7

FB 6

BD9A301MUV-LB

C2 L1 C4

VIN VOUT

17 EPAD

C10

SW1

OFF

GND

J1TP1

TP2

TP3

TP4GND

TP5

TP6

SW 11

SW 10

SS 9TP7

BOOT 13

14 PGD

16 AVIN

2 PVIN

4 PGND

8 MODE

PGD

Circuit Diagram

VIN = 2.7V to 5.5V, VOUT = 1.8V

Figure 2. BD9A301MUV-EVK-001 Circuit Diagram

Bill of Materials

2 C1, C7 Ceramic Capacitor 0.1µF

50V, B, ±10% GRM188B31H104KA92D MURATA 1608

1C2 Ceramic Capacitor 10µF

16V, B, ±10% GRM31CB31C106KA88L MURATA 3216

0C3 Ceramic Capacitor

- Not installed - - 3216

2 C4, C5 Ceramic Capacitor

22µF 6.3V, B, ±20% GRM21BB30J226ME38L MURATA 2012

0C6 Ceramic Capacitor

- Not installed - - 2012

1C8 Ceramic Capacitor

3300pF 50V, B, ±10% GRM188B11H332KA01D MURATA 1608

1C9 Ceramic Capacitor

0.01µF 50V, B, ±10% GRM188B11H103KA01D MURATA 1608

0C10 Ceramic Capacitor

- Not installed - - 1608

1L1 Inductor

1.5µH ±30%, DCR=14.3mΩmax, 7.3A CLF7045T-1R5N TDK 7269

1R1 Resistor

30kΩ 1/10W, 50V, ±1% MCR03EZPFX3002 ROHM 1608

1R2 Resistor

24kΩ 1/10W, 50V, ±1% MCR03EZPFX2402 ROHM 1608

1R3 Resistor

9.1kΩ 1/10W, 50V, ±1% MCR03EZPFX9101 ROHM 1608

1R4 Resistor

10kΩ 1/10W, 50V, ±1% MCR03EZPFX1002 ROHM 1608

2 R5, R7 Resistor

0Ω Jumper MCR03EZPJ000 ROHM 1608

0R6 Resistor

- Not installed - - 1608

PH-1x03SG USECONN -

61300311121 Wurth Electronics Inc. -

1U1 IC

- Buck DC/DC Converter BD9A301MUV-LB ROHM VQFN016V3030

TB111-2-2-U-1-1 Alphaplus Connectors & Cables -

OSTTC022162 On Shore Technology Inc -

MJ254-6BK USECONN -

969102-0000-DA 3M -

Jumper

Jumper pin for SW1

J1, J2

Terminal Block

2 contacts, 15A, 14 to 22AWG

SW1

Pin header

2.54mm × 3 contacts

Reference

Designator

Count

Manufacturer

Part Number

Manufacturer

Configuration

(mm)

Type

Value

Description

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User’s Guide

BD9A301MUV-EVK-001

No. 60UG004E Rev.001

APR.2017

Layout

PCB size：50mm×50mm×1.6mm

Figure 3. Top Silk Screen (Top view)

Figure 4. Top Silk Screen and Layout (Top view)

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User’s Guide

BD9A301MUV-EVK-001

No. 60UG004E Rev.001

APR.2017

Figure 5. Top Side Layout (Top view)

Figure 6. L2 Layout (Top view)

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User’s Guide

BD9A301MUV-EVK-001

No. 60UG004E Rev.001

APR.2017

Figure 7. L3 Layout (Top view)

Figure 8. Bottom Side Layout (Top view)

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User’s Guide

BD9A301MUV-EVK-001

No. 60UG004E Rev.001

APR.2017

100

0.001 0.01 0.1 1 10

Efficiency (%)

Load Current (A)

VIN=3.3V

VIN=5.0V

VO=1.8V

-1

-0.8

-0.6

-0.4

-0.2

0.2

0.4

0.6

0.8

2 2.5 3 3.5 4 4.5 5 5.5 6

Output Voltage Change (%)

Input Voltage (V)

IO=1.0A

-0.5

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

0 0.5 1 1.5 2 2.5 3

Output Voltage Change (%)

Load Current (A)

VIN=3.3V

VIN=5.0V

VO=1.8V

Reference Application Data

Figure 9. Efficiency vs Load Current

Figure 10. Line Regulation

Figure 11. Load Regulation

Figure 12. Load Transient Characteristics

VO (AC)

50mV/div

IO: 1A/div

Time scale 2ms/div

VIN = 5.0V

VO = 1.8V

VIN = 5.0V

VO = 1.8V

IO: 0.75A→2.25A→0.75A

IO: 10mA→3A→10mA

VO (AC)

50mV/div

Time scale 2ms/div

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User’s Guide

BD9A301MUV-EVK-001

No. 60UG004E Rev.001

APR.2017

Figure 13. Loop Response VIN = 3.3V, VO= 1.8V, IO= 1.0A

Frequency (Hz)

Gain (dB)

Phase (deg)

Phase

Gain

fC= 63.1kHz

Phase margin = 66.1deg

Gain margin = 17.5dB

fC= 89.1kHz

Phase margin = 54.1deg

Gain margin = 15.5dB

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

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User’s Guide

BD9A301MUV-EVK-001

No. 60UG004E Rev.001

APR.2017

Figure 15. Input Voltage Ripple Wave

VIN = 3.3V, VO= 1.8V

VIN (AC)

50mV/div

Time scale 50ns/div

Time scale 500ns/div

VIN (AC)

50mV/div

Figure 16. Input Voltage Ripple Wave

VIN = 5.0V, VO= 1.8V

IO= 0A

IO= 3.0A

VIN (AC)

50mV/div

VIN (AC)

50mV/div

IO= 0A

IO= 3.0A

Time scale 500ns/div

Time scale 5ms/div

IO= 0A

IO= 3.0A

VO (AC)

50mV/div

VO (AC)

50mV/div

Figure 17. Output Voltage Ripple Wave

VIN = 3.3V, VO= 1.8V

Figure 18. Output Voltage Ripple Wave

VIN = 5.0V, VO= 1.8V

Time scale 5ms/div

IO= 0A

IO= 3.0A

VO (AC)

50mV/div

VO (AC)

50mV/div

10/10

User’s Guide

BD9A301MUV-EVK-001

No. 60UG004E Rev.001

APR.2017

Figure 19. Start-up EN = VIN

VIN = 3.3V, VO= 1.8V, IO= 0A

VIN

2V/div

1V/div

Time scale 5ms/div

Figure 20. Power-down EN = VIN

VIN = 3.3V, VO= 1.8V, IO= 0A

VIN

2V/div

1V/div

Time scale 5ms/div

Figure 21. Start-up EN = VIN

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

Figure 22. Power-down EN = VIN

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

VIN

2V/div

1V/div

Time scale 2ms/div

Time scale 500ms/div

Figure 23. Start-up by EN

VIN = 3.3V, VO= 1.8V, IO= 0A

Figure 24. Power-down by EN

VIN = 3.3V, VO= 1.8V, IO= 0A

VIN

2V/div

1V/div

Time scale 2ms/div

Time scale 500ms/div

Figure 25. Start-up by EN

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

Figure 26. Power-down by EN

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

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