ROHM BD5423MUV Technical data

Middle Power Class-D Speaker Amplifiers

Analog Input / BTL Output
Class-D Speaker Amplifier

BD5423MUV

●Description

BD5423MUV is a 17W + 17W stereo class-D power amplifier IC, developed for space-saving and low heat-generation
applications such as low-profile TV sets. The IC employs state-of-the-art Bipolar, CMOS, and DMOS (BCD) process technology
that eliminates turn-on resistance in the output power stage and internal loss due to line resistances up to an ultimate level.
With this technology, the IC has achieved high efficiency of 90% (10W + 10W output with 8Ω load), which is the top class in the
industry. The IC, in addition, employs a compact back-surface heat radiation type power package to achieve low power
consumption and low heat generation and eliminates necessity of installing an external radiator, up to a total output of 34W.
This product satisfies both needs for drastic downsizing, low-profile structures and powerful, high-quality playback of the
sound system.

●Features

1) A high efficiency of 90% (10W + 10W output with 8Ω load), which is the highest grade in the industry and low heat-generation.

2) An output of 17W + 17W (12V, with 4Ω load) is allowed without an external heat radiator.

3) Driving a lowest rating load of 4Ω is allowed.

4) Pop noise upon turning power on/off and power interruption has been reduced.

5) High-quality audio muting is implemented by soft-switching technology.

6) An output power limiter function limits excessive output to speakers.

7) High-reliability design provided with built-in protection circuits against high temperatures, against VCC shorting and
GND shorting, against reduced-voltage, and against applying DC voltage to speaker.

8) A master/slave function allowing synchronization of multiple devices reduces beat noises.

9) Adjustment of internal PWM sampling clock frequencies (250kHz to 400kHz) allows easy protective measures against
unwanted radio emission to AM radio band.

10) A compact back-surface heat radiation type power package is employed.
VQFN048V7070 7.0mm × 7.0mm × 1.0mm, pitch 0.5mm

●Absolute maximum ratings

A circuit must be designed and evaluated not to exceed absolute maximum rating in any cases and even momentarily, to prevent
reduction in functional performances and thermal destruction of a semiconductor product and secure useful life and reliability.

The following values assume Ta =25℃. For latest values, refer to delivery specifications.

No.10075EBT03

Parameter

Supply voltage VCC +20 V

Power dissipation Pd

Input voltage for signal pin VIN -0.2 ～ +7.2 V Pin 6, 7 (Note 1)

Input voltage for control pin VCONT -0.2 ～ Vcc+0.2 V Pin 28, 32 (Note 1)

Input voltage for clock pin VOSC -0.2 ～ +7.2 V Pin 31 (Note 1)

Operating temperature range Topr -40 ～ +85 ℃

Storage temperature range Tstg -55 ～ +150 ℃

Maximum junction temperature Tjmax +150 ℃

(Note 1) A voltage that can be applied with reference to GND (pins 5, 18, 19, 42, and 43)
(Note 2) Pd and Tjmax=150℃ must not be exceeded.
(Note 3) 114.3mm × 76.2mm × 1.6mm FR4 2-layer glass epoxy board (Copper Area 5505mm2) installed.
If used under Ta=25℃ or higher, reduce 26.2mW for increase of every 1℃. The board is provided with thermal via.
(Note 4) 114.3mm × 76.2mm × 1.6mm FR4 4-layer glass epoxy board (Copper Area 5505mm2) installed.
If used under Ta=25℃ or higher, reduce 38.4mW for increase of every 1℃. The board is provided with thermal via.

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Symbol Ratings Unit Conditions

Pin 2, 14, 15, 22, 23, 38, 39, 46, 47
(Note 1, 2)

3.28 W (Note 3)

4.8 W (Note 4)

1/16

2010.05 - Rev.B

BD5423MUV

●Operating conditions

The following values assume Ta =25℃. Check for latest values in delivery specifications.

Technical Note

Parameter

Supply voltage VCC +10～+16.5 V Pin 2, 14, 15, 22, 23, 38, 39, 46, 47

Load resistance RL 4 ～ 16 Ω (Note 5)

(Note 5) Pd should not be exceeded.

●Electrical characteristics

Except otherwise specified Ta = 25℃, VCC = 12V, fIN = 1kHz, Rg = 0Ω, RL = 8Ω, MUTEX="H", MS="L"
For latest values, refer to delivery specifications.

Parameter

Whole circuit

Circuit current 1 (Sampling mode) ICC1 25 mA With no signal

Circuit current 2 (Muting mode) ICC2 10 mA MUTEX = “L”

Control circuit

“H” level input voltage VIH 2.3～12 V MUTEX, MS

“L” level input voltage VIL 0～0.8 V MUTEX, MS

Audio circuit

Symbol Ratings Unit Conditions

Symbol Limits Unit Conditions

Voltage gain GV 28 dB PO = 1W

Maximum output power 1 (Note 6) PO1 10 W THD+N = 10%, RL = 8Ω

Maximum output power 2 (Note 6) PO2 17 W THD+N = 10%, RL = 4Ω

Total harmonic distortion (Note 6) THD 0.1 % PO = 1W, BW=20Hz～20kHz

Crosstalk CT 85 dB PO = 1W, Rg = 0Ω, BW = IHF-A

Output noise voltage
(Sampling mode)

Residual noise voltage
(Muting mode)

Internal sampling clock frequency FOSC 250 kHz MS = “L” (In master operation)

(Note 6) The rated values of items above indicate average performances of the device, which largely depend on circuit layouts, components,
and power supplies. The reference values are those applicable to the device and components directly installed on a board specified by us.

NO 80 µVrms Rg = 0Ω, BW = IHF-A

V

NOM 1 µVrms Rg = 0Ω, BW = IHF-A, MUTEX = “L”

V

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2/16

2010.05 - Rev.B

BD5423MUV

●Electrical characteristic curves (Reference data)

(1) Under Stereo Operation(RL=8Ω)

100

Vcc=12V
RL=8Ω

10

BW=20～20kHz

1

THD+N (%)

0.1

0.01

0.001 0.01 0.1 1 10 100

OUTPUT POWER (W)

Fig. 3 Voltage gain - Frequency Fig. 4 Crosstalk - Frequency

Fig. 1 THD+N － Output power

40

35

30

25

20

15

10

VOLTAGE GAIN (dB)

Vcc=12V

L

=8Ω

R
Po=1W
L=33µH
C=0.47µF
Cｇ=0.1µF

5

0

10 100 1000 10000 100000

FREQUENCY (Hz)

6kHz

1kHz

100Hz

0

Vcc=12V

L

=8Ω

-20

R
fin=1kHz
BW=20～20kHz

-40

-60

CROSSTALK (dB)

-80

-100

0.001 0.01 0.1 1 10 100
OUTPUT POWER (W)

Fig. 5 Crosstalk - Output power Fig. 6 Output power - Power supply voltage

100

10

1

THD+N (%)

0.1

0.01
10 100 1000 10000 100000

CROSSTALK (dB)

-100

Fig. 2 THD+N － Frequency

0

-20

-40

-60

-80

10 100 1000 10000 100000

20

RL=8Ω
fin=1kHz

15

10

5

OUTPUT POWER (W)

0

8 1012141618

FREQUENCY (Hz)

FREQUENCY (Hz)

THD=10%

VCC (V)

Technical Note

Vcc=12V

L

=8Ω

R
Po=1W
BW=20～20kHz

Vcc=12V

L

=8Ω

R
Po=1W
BW=20～20kHz

THD=1%

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3/16

2010.05 - Rev.B

BD5423MUV

●Electrical characteristic curves (Reference data) – Continued

100

90
80
70
60
50
40
30

EFFICIENCY (%)

20
10

Vcc=10V

L

=8Ω

R
fin=1kHz

0

0 5 10 15 20

OUTPUT POWER (W/ch)

Fig. 7 Efficiency - Output power Fig. 8 Efficiency - Output power

100

100

90
80
70
60
50
40
30

EFFICIENCY (%)

20
10

0

0 5 10 15 20

OUTPUT POWER (W/ch)

3

90
80
70
60

2

Vcc=10V

Vcc=12V

50
40
30

EFFICIENCY (%)

20
10

Vcc=16.5V

L

=8Ω

R
fin=1kHz

0

0 5 10 15 20

OUTPUT POWER (W/ch)

Fig. 9 Efficiency - Output power Fig. 10 Current consumption - Output power

100

RL=8Ω

90

無信号時

Without signal

80
70
60

ICC (A)

1

0

0 5 10 15 20 25 30 35 40

TOTAL OUTPUT POWER (W)

0

-20

-40

-60

50
40

ICC (mA)

30
20
10

Sampling

Mute

0

8 1012141618

VCC (V)

Fig. 11 Current consumption - Power supply voltage Fig. 12 FFT of Output Noise Voltage

-80

-100

NOISE FFT (dBV)

-120

-140
10 100 1000 10000 100000

FREQUENCY (Hz)

Technical Note

Vcc=12V

L

R
fin=1kHz

Vcc=16.5V

Vcc=12V

L

R

=8Ω

Without signal

無信号時
BW=20～20kHz

=8Ω

RL=8Ω
fin=1kHz

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4/16

2010.05 - Rev.B

BD5423MUV

Technical Note

●Electrical characteristic curves (Reference data) – Continued

MUTEX

Pin 28

TM

Pin 34

10V/div

5V/div

Vcc=12V
R

=8

L

Ω

Po=500mW
fin=500Hz

MUTEX

Pin 28

TM

Pin 34

10V/div

5V/div

Speaker output

2V/div

10msec/div

Speaker output

2V/div

10msec/div

Fig. 13 Wave form when Releasing Soft-mute Fig. 14 Wave form when Activating Soft-mute

Fig. 15 Wave form on Instantaneous Power Interruption

(20msec / div)

Fig. 16 Wave form on Instantaneous Power Interruption

(2msec / div)

Fig. 17 Wave form on Output Power Limiter function

(Po = 5W)

Vcc=12V

=8

R

L

Ω

Po=500mW

fin=500Hz

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5/16

2010.05 - Rev.B

BD5423MUV

Technical Note

●Electrical characteristic curves (Reference data) – Continued

(2) Under Stereo Operation(RL=6Ω)

25

20

RL=6Ω
fin=1kHz

THD=10%

15

10

OUTPUT POWER (W)

5

0

8 1012141618

VCC (V)

Fig. 18 Output power - Power supply voltage

100

90
80
70
60
50
40
30

EFFICIENCY (%)

20
10

0

0 5 10 15 20 25

OUTPUT POWER (W/ch)

Vcc=10V

L

=6Ω

R
fin=1kHz

100

90
80
70
60
50
40
30

EFFICIENCY (%)

20
10

0

0 5 10 15 20 25

OUTPUT POWER (W/ch)

Vcc=12V

L

=6Ω

R
fin=1kHz

Fig. 19 Efficiency - Output power Fig. 20 Efficiency - Output power

100

90
80
70
60
50
40
30

EFFICIENCY (%)

20
10

0

0 5 10 15 20 25

OUTPUT POWER (W/ch)

Vcc=16.5V

L

R

=6Ω

fin=1kHz

4

3

Vcc=12V

Vcc=16.5V

Vcc=10V

2

ICC (A)

1

RL=6Ω
fin=1kHz

0

0 5 10 15 20 25 30 35 40 45 50

TOTAL OUTPUT POWER (W)

Fig. 21 Efficiency - Output power Fig. 22 Current consumption - Output power

Dotted lines of the graphs indicate continuous output power to be obtained on musical signal source or by installing
additional heat sinks.

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6/16

2010.05 - Rev.B

BD5423MUV

Technical Note

●Electrical characteristic curves (Reference data) – Continued

(3) Under Stereo Operation(RL=4Ω)

30

RL=4Ω
fin=1kHz

25

THD=10%

20

15

10

5

OUTPUT POWER (W)

0

8 1012141618

VCC (V)

Fig. 23 Output power - Power supply voltage

100

90
80
70
60
50
40
30

EFFICIENCY (%)

20
10

0

0 5 10 15 20

OUTPUT POWER (W/ch)

Vcc=10V

L

=4Ω

R
fin=1kHz

100

90
80
70
60
50
40
30

EFFICIENCY (%)

20
10

0

0 5 10 15 20

OUTPUT POWER (W/ch)

Vcc=12V

L

R

=4Ω

fin=1kHz

Fig. 24 Efficiency - Output power Fig. 25 Efficiency - Output power

100

90
80
70
60
50
40
30

EFFICIENCY (%)

20
10

0

0 5 10 15 20

OUTPUT POWER (W/ch)

Vcc=16.5V

L

=4Ω

R
fin=1kHz

4

3

Vcc=10V

Vcc=12V

2

ICC (A)

1

Vcc=16.5V

RL=4Ω
fin=1kHz

0

0 5 10 15 20 25 30 35 40

TOTAL OUTPUT POWER (W)

Fig. 26 Efficiency - Output power Fig. 27 Current consumption - Output power

Dotted lines of the graphs indicate continuous output power to be obtained on musical signal source or by installing
additional heat sinks.

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7/16

2010.05 - Rev.B

BD5423MUV

●Pin Assignment

Technical Note

Top View

BSP1P

PLMT4

PLMT3

PLMT2

PLMT1

IN1

IN2

GNDA

FILA

FILP

VCCA

BSP2P

123456789101112

13

N.C.

VCCP1P

VCCP1P

OUT1P

OUT1P

GNDP1

GNDP1

OUT1N

OUT1N

VCCP1N

VCCP1N

N.C.

N.C.

14

15

16

17

18

19

20

21

22

23

N.C.

24

●Outer Dimensions and Inscriptions

Power Limit

PWM1 PWM2

DRIVER

1P

DRIVER

WARNING

BSP1N

WARNING

1N

ERROR

ERROR

Protections & Logic

Under Voltage Protection

High Temperature Protection

Output Short Protection

Output DC Voltage Protection

Mute

Control

N.C.

N.C.

N.C.

N.C.

MUTEX

Fig. 28 Pin Assignment Diagram

Type

Clock

OSC

GNDA

FILP

FILA

Ramp

Control

MS

DRIVER

DRIVER

Generator

ROSC

VCCA

2P

2N

SOFT

MUTE

Power-Off

3534333231302928272625

TM

N.C.

48

N.C.

VCCP2P

47

VCCP2P

46

OUT2P

45

44

OUT2P

GNDP2

43

42

GNDP2

OUT2N

41

OUT2N

40

VCCP2N

39

VCCP2N

38

N.C.

Detector

36

BSP2N

VHOLD

N.C.

37

BD5423

Fig. 29 Outer Dimensions and Inscriptions of VQFN048V7070 Package

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Lot No.

8/16

2010.05 - Rev.B

BD5423MUV

●Explanation of Pin Functions (Provided pin voltages are typical values.)

No. Symbol Pin voltage Pin description

Internal equalizing circuit

Technical Note

2 VCCA Vcc Analog system power pin

PWM system bias pin

12

Connect a capacitor.

Analog signal system bias pin

Connect a capacitor.

3 FILP

4 FILA 3.5V

5 GNDA 0V Analog system GND pin

Vcc+35

6
7

8 PLMT1 3.5V

9 PLMT2 -

IN2
IN1

3.5V

ch2 Analog signal input pin
ch1 Analog signal input pin

Input audio signal via a capacitor.

Voltage-to-current conversion pin for
output power limiter function

Connect a register.

Current-to-voltage conversion pin for
output power limiter function

Connect a register.

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9/16

2010.05 - Rev.B

BD5423MUV

●Explanation of Pin Functions - Continued

No. Symbol Pin voltage Pin description Internal equalizing circuit

Current-to-voltage conversion pin for

10 PLMT3 -

11 PLMT4 3.5V

output power limiter function

Connect a register.

Bias pin for output power limiter function

Connect a register and a capacitor.

Technical Note

12 BSP1P -

14, 15 VCCP1P Vcc

16, 17 OUT1P Vcc～0V

18, 19 GNDP1 0V ch1 power system GND pin

20, 21 OUT1N Vcc～0V

22, 23 VCCP1N Vcc

ch1 positive bootstrap pin
Connect a capacitor.

ch1 positive power system power supply
pin

ch1 positive PWM signal output pin
Connect with output LPF.

ch1 negative PWM signal output pin
Connect with output LPF.

ch1 negative power system power supply
pin

25 BSP1N -

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ch1 negative bootstrap pin
Connect a capacitor

10/16

2010.05 - Rev.B

BD5423MUV

●Explanation of Pin Functions - Continued

No. Symbol Pin voltage Pin description Internal equalizing circuit

Warning output pin

Pin to notify operation warning.
H: Under warning
L: Normal operation

Connect a resister.

Error output pin

A pin for notifying operation errors.
H: Error
L: Normal operation

Connect a resister.

26 WARNING

27 ERROR

H: 5V

L: 0V

H: 5V

L: 0V

Technical Note

28 MUTEX -

13, 24
29, 30

37,48

31 OSC -

32 MS -

N.C.

-

Audio mute control pin

H: Mute off
L: Mute on

N.C. pin
Nothing is connected with IC internal
circuit.

Sampling clock signal input/output pin

When using two or more sampling clocks,
connect via a capacitor.

Master/Slave switching pin

Switching of master/slave functions on a
sampling clock signal.
H: Slave operation
L: Master operation

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11/16

2010.05 - Rev.B

BD5423MUV

●Explanation of Pin Functions - Continued

No. Symbol Pin voltage Pin description Internal equalizing circuit

Internal PWM sampling clock
frequency setting pin

33 ROSC 5.6V

34 TM 0～5V

Usually the pin is used open.
To adjust an internal sampling clock
frequency, connect a resister.

Audio muting constant setting pin

Connect a capacitor.

Technical Note

Instantaneous power interruption
detecting voltage setting pin

35 VHOLD 0.68×Vcc

36 BSP2N -

38, 39 VCCP2N Vcc

40, 41 OUT2N Vcc～0V

42, 43 GNDP2 0V cch2 power system GND pin

44, 45 OUT2P Vcc～0V

Connect a capacitor.
To adjust a detecting voltage, connect a
resister.

ch2 negative bootstrap pin
Connect a capacitor.

ch2 negative power system power supply
pin

ch2 negative PWM signal output pin
Connect an output LPF.

ch2 positive PWM signal output pin
Connect an output LPF.

46, 47 VCCP2P Vcc

1 BSP2P -

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ch2 positive power system power supply
pin

ch2 positive bootstrap pin
Connect a capacitor.

12/16

2010.05 - Rev.B

BD5423MUV

●Application Circuit Diagram (under stereo operation)

・Vcc=10V～16.5V

Technical Note

SP 1ch

(4Ω)

10μF

C17
1μF

VCCP1

C15

GNDP1

C2

C3

DRIVER

DRIVER

Generator

OPEN

VCCA

10μF

+

C5

0.1μF

1μF

123456789101112

FILP

VCCA

N.C.

N.C.

48

47

46

45

2P

44

43

42

41

2N

40

39

38

N.C.

SOFT

MUTE

Detector

Power-Off

3534333231302928272625

C34

0.1μF

3.3μF

GNDD

37

36

C35

C46

0.1μF

C38

0.1μF

N.C.

C1

0.68μF

L44

15μH

C44

0.22μF

C40

0.22μF

15μH

L40

C36

0.68μF

VCCP2

GNDP2

+

C39

10μF

C41

1μF

SP 2ch

(4Ω)

GNDA

SP INPUT 1ch

SP INPUT 2ch

2.2μF

C6

C4

10μF

FILA

GNDA

C12

0.68μF

N.C.

GNDA

R9

C11

0.1μF

22kΩ

R10

22kΩ

Power Limit

13

N.C.

GNDA

2.2μF

R8

22kΩ

C7

14

L16

15μH

C16

0.22μF

C20

0.22μF

15μH

L20

C25

C14

0.1μF

C22

0.1μF

N.C.

16

17

DRIVER

1P

18

19

20

21

DRIVER

1N

22

23

N.C.

24

WARNING

ERROR

R27

R26

100kΩ

GNDD

ERROR OUTPUT

WARNING OUTPUT

+

0.68μF

15

PWM1 PWM2

Protections & Logic

Under Voltage Protection

High Temperature Protection

Output Short Protection

Output DC Voltage Protection

Mute

Control

N.C.

N.C.

N.C.

100kΩ

GNDD

N.C.

MUTESPX

Ramp

Clock

Control

C31

0.1μF

SLAVE

MASTER

CAREER I/O

Fig. 30 Circuit Diagram of Stereo Operation with 4Ω Load

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13/16

2010.05 - Rev.B

BD5423MUV

Technical Note

Table 1 BOM List of Stereo Operation with 4Ω Load

No. Item Part Number Vendor

1 IC BD5423MUV ROHM VQFN048V7070 - - - - 1 IC1

2 C GRM219B31E684KA88 MURATA 2012 0805 0.68µF 25V ±10% ±10% 4 C1, C12, C25, C36

3 C GRM188R11H104KA93 MURATA 1608 0603 0.1µF 50V ±10% ±15% 5 C5, C14, C22, C38, C46

4 C GRM31MB11H224KA01 MURATA 3216 1206 0.22µF 50V ±10% ±10% 4 C16, C20, C40, C44

5 C 25ST225M3216 Rubycon 3225 1210 2.2µF 25V ±20% ±5% 2 C6, C7

6 C 50ST105M3225 Rubycon 3225 1210 1µF 50V ±20% ±5% 2 C17, C41

7 C GRM21BB31E335KA75 MURATA 2012 0805 3.3µF 25V ±10% ±10% 1 C35

8 C GRM188B11E104KA01 MURATA 1608 0603 0.1µF 25V ±10% ±10% 3 C11, C31, C34

9 C GRM21BB11C105KA01 MURATA 2012 0805 1µF 16V ±10% ±10% 1 C3

10 C GRM21BB31C106KE15 MURATA 2012 0805 10µF 16V ±10% ±10% 1 C4

Configuration

mm inch

Val ue

Rated

voltage

Tolerance

Temperature

characteristics

Quantity Reference

11 C 25SVPD10M SANYO 6666 2626 10µF 25V ±20% ±25% 3 C2, C15, C39

12 R MCR01MZPF2202 ROHM 1005 0402 22kΩ 50V ±1% ±200ppm/℃ 3 R8, R9, R10

13 R MCR01MZPF1003 ROHM 1005 0402 100kΩ 50V ±1% ±200ppm/℃ 2 R26, R27

No. Item Part Number Vendor

14 L 7G09B-150M SAGAMI 10×9×10 15µH×2 ±20% 44mΩmax. 4.1A max. 2 L16, L20, L40, L44

Configuration

mm

Value Tolerance

DC

Resistance

Rated

DC Current

Quantity Reference

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14/16

2010.05 - Rev.B

BD5423MUV

Technical Note

●Notes for use Notes for use

1. About absolute maximum ratings
If an applied voltage or an operating temperature exceeds an absolute maximum rating, it may cause destruction of a
device. A result of destruction, whether it is short mode or open mode, is not predictable. Therefore, provide a physical
safety measure such as fuse, against a special mode that may violate conditions of absolute maximum ratings.

2. About power supply line
As return of current regenerated by back EMF of output coil happens, take steps such as putting capacitor between
power supply and GND as a electric pathway for the regenerated current. Be sure that there is no problem with each
property such as emptied capacity at lower temperature regarding electrolytic capacitor to decide capacity value. If the
connected power supply does not have sufficient current absorption capacity, regenerative current will cause the voltage
on the power supply line to rise, which combined with the product and its peripheral circuitry may exceed the absolute
maximum ratings. It is recommended to implement a physical safety measure such as the insertion of a voltage clamp
diode between the power supply and GND pins.

3. Potential of GND (5, 18, 39, 42, and 43 pins)
Potential of the GND terminal must be the lowest under any operating conditions.

4. About thermal design
Perform thermal design with sufficient margins, in consideration of maximum power dissipation Pd under actual operating
conditions. This product has an exposed frame on the back of the package, and it is assumed that the frame is used with
measures to improve efficiency of heat dissipation. In addition to front surface of board, provide a heat dissipation pattern
as widely as possible on the back also.
A class-D power amplifier has heat dissipation efficiency far higher than that of conventional analog power amplifier and
generates less heat. However, extra attention must be paid in thermal design so that a power dissipation Pdiss should not
exceed the maximum power dissipation Pd.

Maximum power dissipation

Power dissipation

Pd



Ta-T

η

〔W〕



1



1-

〔W〕






aj

θ




Odiss

PP








Tjmax: Maximum temperature junction = 150[℃]
Ta: Operating ambient temperature [℃]
θja: Package thermal resistance [℃/W]
Po: Output power [W]

η: Efficiency

jmax

5. About operations in strong electric field
Note that the device may malfunction in a strong electric field.

6. Thermal shutdown (TSD) circuit
This product is provided with a built-in thermal shutdown circuit. When the thermal shutdown circuit operates, the output
transistors are placed under open status. The thermal shutdown circuit is primarily intended to shut down the IC avoiding
thermal runaway under abnormal conditions with a chip temperature exceeding Tjmax = 150℃, and is not intended to
protect and secure an electrical appliance. Accordingly, do not use this circuit function to protect a customer's electrical
appliance.

7. About shorting between pins and installation failure
Be careful about direction and displacement of an LSI when installing it onto the board. Faulty installation may destroy
the LSI when the device is energized. In addition, a foreign matter getting in between LSI pins, pins and power supply,
and pins and GND may cause shorting and destruction of the LSI.

8. About power supply startup and shutdown
When starting up a power supply, be sure to place the MUTEX pin (pin 28) at “L” level. When shutting down a power
supply also, be sure to place the pin at “L” level. Those processes reduce pop noises generated upon turning on and off
the power supply. In addition, all power supply pins must be started up and shut down at the same time.

9. About WARNING output pin (pin 26) and ERROR output pin (pin 27)
A WARNING flag is output from the WARNING output pin upon operation of the high-temperature protection function and
under-voltage protection function. And an ERROR flag is output from the ERROR output pin upon operation of VCC/GND
shorting protection function and speaker DC voltage applying protection function. These flags are the function which the
condition of this product is shown in. The use which aimed at the protection except for this product is prohibition.

10. About N.C. pins (pins 13, 24, 29, 30, 37, and48)
The N.C. (Non connection) pins are not connected with an internal circuit. Leave the pins open or connect them to GND.

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15/16

2010.05 - Rev.B

BD5423MUV

●Ordering part number

Technical Note

B D

Part No
BD.

VQFN048V7070

5 4 2 3 MU V

-E 2

Part No.

5423

Package

MUV: VQFN048V7070

7.0± 0.1

7.0± 0.1

1PIN MARK

1.0MAX

0.08 S

4.7± 0.1

C0.2

112

48

37

0.4± 0.1

0.75

0.5

0.25

S

0.02

(0.22)

+0.03

-

0.02

13

4.7± 0.1

24

2536

+0.05

-

0.04

(Unit : mm)

<Tape and Reel information>

Embossed carrier tapeTape

Quantity

Direction
of feed

1500pcs
E2

The direction is the 1pin of product is at the upper left when you hold

()

reel on the left hand and you pull out the tape on the right hand

Reel

1pin

Order quantity needs to be multiple of the minimum quantity.

∗

Packaging and forming specification
E2: Embossed tape and reel

Direction of feed

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16/16

2010.05 - Rev.B

Notes

No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.

The content specied herein is subject to change for improvement without notice.

The content specied herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specications,
which can be obtained from ROHM upon request.

Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.

Great care was taken in ensuring the accuracy of the information specied in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.

The technical information specied 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 and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.

Notice

The Products specied in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, ofce-automation equipment, commu­nication devices, electronic appliances and amusement devices).

The Products specied in this document are not designed to be radiation tolerant.

While ROHM always makes efforts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.

Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, re or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, re control and fail-safe designs. ROHM
shall bear no responsibility whatsoever for your use of any Product outside of the prescribed
scope or not in accordance with the instruction manual.

The Products are not designed or manufactured to be used with any equipment, device or
system which requires an extremely high level of reliability the failure or malfunction of which
may result in a direct threat to human life or create a risk of human injury (such as a medical
instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel­controller or other safety device). ROHM shall bear no responsibility in any way for use of any
of the Products for the above special purposes. If a Product is intended to be used for any
such special purpose, please contact a ROHM sales representative before purchasing.

If you intend to export or ship overseas any Product or technology specied herein that may
be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to
obtain a license or permit under the Law.

Thank you for your accessing to ROHM product informations.
More detail product informations and catalogs are available, please contact us.

ROHM Customer Support System

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R1010

A