ROHM BD5471MUV Technical data

Small-sized Class-D Speaker Amplifiers

Analog Input
Stereo Class-D Speaker Amplifier

BD5471MUV

●Description

BD5471MUV is a low voltage drive class-D stereo speaker amplifier that was developed for note-book PC, cellular phone,
mobile audio products and the others. LC filters of speaker outputs are unnecessary, and only 7 external components are
needed for speaker system. Also, 3.3V regulator in BD5471MUV can use power supply for audio-codec. BD5471MUV, that
is high-efficiency, low consumption, is suitable for application by using battery. Shutdown current is 0µA typically. Also,
start-up time is fast from shutdown to active mode. BD5471MUV can use for some applications that change mode between
“shutdown state” and “active state”.

●Features

1) High power 2.3W typ. (VDD=5V, RL=4Ω, THD+N=10%, stereo input)
High power 1.5W typ. (VDD=5V, RL=8Ω, THD+N=10%, stereo input)

2) Gain selectable by the external control (6, 12, 18, 24dB)

3) Pop noise suppression circuitry

4) Standby function (Mute function) [I

5) Protection circuitry (Short protection [Audio, REG], Thermal shutdown, Under voltage lockout)

6) Built-in 3.3V regulator

7) Built-in BEEP detect circuitry

8) Very small package VQFN024V4040

●Applications

Notebook computers,Mobile electronic applications,Mobile phones,PDA etc.

●Absolute Maximum Ratings(Ta=+25℃)

Parameter Symbol Ratings Unit

=0uA]

SD

No.10101EAT03

Power Supply Voltage VDD 7.0 V

0.7 *1 W

Power Dissipation Pd

2.2 *2 W

Storage Temperature Range Tstg -55 ~ +150 ℃

Input Voltage Range *3 Vin -0.3 ~ VDD+0.3 V

Control Terminal
Input Voltage Range *4

*1 74.2mm×74.2mm×1.6mm, FR4 1-layer glass epoxy board(Copper on top layer 0%)
Derating in done at 5.6mW/℃ for operating above Ta=25℃. There are thermal via on the board
*2 4.2mm×74.2mm×1.6mm, FR4 4-layer glass epoxy board (Copper on bottom 2 and 3 layer 100%)
*3 input Terminal (INL+, INL-, INR+, INR-)
*4 Control Terminal (MUTE, G0, G1, EAPD, BEEP, REG_SD)

●Operating Conditions

Parameter Symbol Ratings Unit

Power Supply Voltage

Temperature Range

* These products aren’t designed for protection against radioactive rays.

Vctl -0.3 ~ VDD+0.3 V

VDD +4.5 ~ +5.5 V

Topr -40 ~ +85 ℃

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© 2010 ROHM Co., Ltd. All rights reserved.

1/21

2010.06 - Rev.A

BD5471MUV

Technical Note

●Electric Characteristics(Unless otherwise specified, Ta=+25℃, VDD=+5.0V, RL=8Ω, AC item= LC Filter(L=22µH, C=1µF) )

Parameter Symbol

Circuit current (Active)

Circuit current (Standby)

Circuit current (Regulator)

Circuit current (Shutdown)

I

I

STBY

I

CCR

I

CC

SD

MIN. TYP. MAX.

Limits

― 5.5 12.0 mA

Unit Conditions

Active mode,
MUTE=H, EAPD=H, No load

― 0.1 1.0 mA Standby mode, MUTE=H,EAPD=L

― 0.15 1.0 mA

― 0.1 2.0 µA

Regulator Mode, MUTE=EAPD=L
REG_SD=H
Shutdown mode, MUTE=L,
REG_SD=L

<Speaker Amplifier>

Output power 1 P

Output power 2 P

0.8 1.2 ― W

O1

1.0 1.5 ― W

O2

BTL, f=1kHz, THD+N=1%,
Stereo input, *1, *2
BTL, f=1kHz, THD+N=10%,
Stereo input, *1, *2

5.5 6.0 6.5 dB BTL, G0=G1=GND

11.5 12 12.5 dB BTL, G0=GND, G1=VDD

Voltage gain GV

17.5 18 18.5 dB BTL, G0=VDD, G1=GND

23.5 24 24.5 dB BTL, G0=G1=VDD

Total harmonic distortion THD+N ― 0.2 1.0 % BTL, Po=0.7*P

Crosstalk C

60 70 ― dB BTL, f=1kHz *1, *3

T

S/N SNR 70 90 ― dB BTL, Po=P

Switching Frequency fosc 175 250 325 kHz

Start-up time Ton 0.78 1.02 1.46 msec

63 90 117 kΩ G0=G1=GND

42 60 78 kΩ G0=GND, G1=VDD

Input resistance R

IN

25 36 47 kΩ G0=VDD, G1=GND

14 20 26 kΩ G0=G1=VDD

<Regulator>

Output voltage Vo 3.15 3.30 3.45 V Io=150mA

Maximum output current Iom 150 200 ― mA Vo=3.15V

Load regulation L

― 0.2 1 mV/mA Io=0→150mA

REG

<Control terminal (MUTE, G0, G1, EAPD, BEEP, REG_SD) >

Control terminal
input voltage

High-level

Low-level

Control terminal input current

*1: B.W.=400 ~ 30kHz, BTL:The voltage between 3pin and 6pin, 13pin and 16pin

V

V

CTLH

CTLL

I

CTL

1.4 ― VDD V

0 ― 0.4 V

22 33 44 µA

Control terminal Input voltage
V

CTL

●Active / Standby Control

Mode Pin level Conditions

MUTE H/L IC active/ shutdown

EAPD H/L IC active/standby

BEEP H/L IC active/standby

REG_SD H/L REG active/shutdown

=5V

O1

*1, *2

O1

*1, *3

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© 2010 ROHM Co., Ltd. All rights reserved.

2/21

2010.06 - Rev.A

BD5471MUV

A

_

2.2μF

E

S

C11

8

C9

S

●Measurement Circuit Diagram

V

BEEP

BEEP

A

1

V

V

SE

22μF

1μF

V

V

BTL

8Ω

VDD

DET_C

C1

0.01u
F

OUTL

PVDD

PGNDL

2

3

4

5

V

V

SE

22μF

1μF

OUTL-

6

●Package Outlines

D5471

Vin Vin Vin Vin

C

0.1μF

24 19202122

150k

SHORT

SHORT

SHORT

SHORT

MUT

7 8 9 10 11

A

C7

0.1μF
INL - INR

23

BEEP

DE T

BEEP

H-

Bridge

150k

EAPD

MUTE EAP REG_S

A

V

MUTE

BEEP
MUT
EAPD

150k

V

EAPD

Gain

Select

PWM

GNDINL+

UVLO TSD SHOR

BIAS

A

V

10u

C6

G0

G0

G1 G1

STOP

OSC

REG_

VDD

VDD

AVD D

Gain

Select

PWM

UVLO

T

3.3VRE

REG_VD

C2

+B

D

VQFN024V4040 (Plastic Mold)

UVLO

T

C5

0.1 μF

Bridg

D

REG_OU

C4

0.1μF

INR＋

G0

150 k

G1

150k

SHORT

H-

SHORT

REG

12

C3

Bottom View Top View

(Unit: mm)

Technical Note

V

G0

18

G1

17

OUT R

16

PVDD

15

PGND

14

OUTR-

13

GN

G0

A

V

G1

A

22μF

1μF

8Ω

22μF

1μF

V

V

SE

V

BTL

V

V

SE

V

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© 2010 ROHM Co., Ltd. All rights reserved.

3/21

2010.06 - Rev.A

BD5471MUV

●Block Diagram ●Pin Assignment <top view>

INL+

24

INL-

23

INR+

19

INR-

20

G0

18

G1

17

MUTE

7

EAPD

8

BEEP

1

DET_C

2

REG_SD

9

150k

150k

150k

150k

150k

150k

PVDDL

4

Gain
Select

G0 G1

Gain
Select

G0 G1

G0

G1

REG

12

REG_GND

REG_VDD

10 15

Short

TSD

UVLO

Bias

BEEP

Detect

5

PGNDL

3.3V

PVDDR

PWM

PWM

OSC

14

PGNDR

ERROR

ERROR

Control

Logic

Short
Protection

AVDD

21

H­Bridge

Short
Protection

H­Bridge

ERROR

22

AGND

OUTL+
3

6
OUTL-

OUTR+

16

13

OUTR-

REG_OUT

11

24 23 22 21 20 19

INL+

INL-

AGND

BEEP

1

2

DET_C

3

OUTL+

PVDDL

4

5

PGNDL

OUTL-

6

EAPD

MUTE

7 8 9 10 11 12

REG SD

●Pin Assignment Table

PIN No. PIN Name

1 BEEP
2 DET_C
3 OUTL+
4 PVDDL
5 PGNDL
6 OUTL­7 MUTE
8 EAPD

9 REG_SD
10 REG_VDD
11 REG_OUT
12 REG_GND
13 OUTR­14 PGNDR
15 PVDDR
16 OUTR+
17 G1
18 G0
19 INR+
20 INR­21 AVDD
22 AGND
23 INL­24 INL+

Technical Note

INR-

AVDD

REG VDD

INR+

G0

18

17

G1

OUTR+

PVDDR

PGNDR

OUTR-

REG OUT

REG GND

16

15

14

13

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© 2010 ROHM Co., Ltd. All rights reserved.

4/21

2010.06 - Rev.A

BD5471MUV

●Application Circuit Example

Differential
Input

Differential
Input

Gain
Control

BEEP

H：Active

L：Shutdown

MUTE

EAPD

REG_SD

Audio
InputL+

Audio
InputL-

Audio
InputR+

Audio
InputR-

G0

G1

0.01μF

0.1μF

C2

0.1μF

C1

0.1μF

C4

0.1μF

C3

C8

REG_SD

INL+

INL-

INR+

INR-

MUTE

EAPD

BEEP

DET_C

Technical Note

C5
10μF

PVDDL

REG_VDD

10 15

4

24

Gain
Select

23

G0 G1

19

Gain
Select

20

G0 G1

G0

18

G1

17

7

8

1

2

9

150k

150k

150k

150k

150k

150k

REG_GND

REG

G0

G1

12

PGNDL

Bias

BEEP

Detect

Short

TSD

UVLO

5

PWM

PWM

OSC

3.3V

14

PVDDR

Short

Control

Logic

Short
Protection

PGNDR

21

H­Bridge

ERROR

H­Bridge

ERROR

22

AVDD

Short
Protection

ERROR

AGND

OUTL+
3

6
OUTL-

OUTR+

16

13

OUTR-

REG_OUT

11

2.2μF

C7

Sing le-Ended
Input

Sing le-Ended
Input

Gain
Contr ol

BEEP

H：Active

L：Shutdown

MUTE

EAPD

REG _SD

Audio
Input L

Audio
Input R

G0

G1

0.01μF

Differential input

C5
10μF

PVDDL

REG_VDD

4

Gain
Sele ct

Gain
Sele ct

G0

G1

REG

12

Bias

BEEP

Detect

PGNDL

10 15

PWM

PWM

Short

TSD

UVLO

OSC

3.3V

5

14

0.1μF

INL+

24

C2

INL-

0.1μF

0.1μF

C4

0.1μF

DET_C

C8

REG_SD

INR+

INR-

G0

G1

MUTE

EAPD

BEEP

23

G0 G1

19

20

G0 G1

18

150k

17

150k

7

150k

8

150k

1

150k

2

9

150k

REG_GND

C1

C3

PVDDR

Short

Cont rol

Logic

Short
Protection

PGND R

21

H­Bridge

ERROR

Shor t
Protection

H­Bridge

ERROR

22

AGND

AVDD

ERROR

OUTL+
3

6
OUTL-

OUTR+

16

13

OUTR-

REG_OUT

11

2.2μF

C7

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© 2010 ROHM Co., Ltd. All rights reserved.

Single-Ended input

5/21

2010.06 - Rev.A

BD5471MUV

●Evaluation board Circuit Diagram

JP1

BEEP

1

DET_C

C1

2

OUTL+

3

to Speaker
(BTL)

PVDDL

PGNDL

4

5

OUTL-

6

Please connect
to Input Signal line.

Please connect
to Power Supply
(VDD=+2.5～5.5V) line.

Please connect
to GND line.

Audio Input

C7 C6

INL+ INL-

23

24

150k

BEEP

DET

BEEP

SHORT

H-

SHORT

SHORT

SHORT

MUTE

7

Bridge

BEEP
MUTE
EAPD

EAPD

150k

150k

MUTE

8

JP2 JP3 JP4

AGND

22

Gain

G0

Select

G1 G1

UVLO

PWM

STOP

BIAS

EAPD RE G_SD

9

C5

C8

TSD SHORT

OSC

Technical Note

Audio Input

C4 C3

Gain

Select

PWM

UVLO

TSD

3.3VREG

UVLO

20

TSD

11

INR-

H-

Bridge

REG_OUT

C2

19

G0

G1

SHORT

SHORT

12

INR+

150k

150k

REG_GND

G0

18

G1

17

OUTR+

16

PVDDR

15

PGNDR

14

OUTR-

13

JP4

JP5

to Speaker
(BTL)

Please connect
to Speaker.

AVDD

21

G0

REG_VDD

10

3.3V
Regulator

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© 2010 ROHM Co., Ltd. All rights reserved.

6/21

2010.06 - Rev.A

BD5471MUV

●Evaluation board Parts List

Qty. Item Description SMD Size Manufacturer/Part Number

Technical Note

1 C1 Capacitor, 0.01μF 1608

1 C2 Capacitor, 2.2μF 1608

2 C3, C4,C6,C7 Capacitor, 0.1μF 1608

1 C5, C8 Capacitor, 10μF A (3216)

1 U1

1 PCB1

●The relation in the gain setting and input impedance Ri

The gain setting terminal (G0,G1)

G0 G1 Gain[dB] Ri [Ohm]

L L 6 90k

L H 12 60k

H L 18 36k

H H 24 20k

●Description of External parts
①Power down timing capacitor (C1)

It’s the capacitor which adjusts time from BEEP signal stop to amplifier stop.
Turn off time Toff is set the following formula.



Toff

②Regulator output capacitor(C2)

Output capacitor of 3.3V regulator.
Use capacitance equal to or more than 1uF.

③Input coupling capacitor Ci (C3,C4, C6,C7)

It makes an Input coupling capacitor 0.1uF.
Input impedance Ri in each gain setting becomes the above table.
In 18dB gain setting, it is Ri=36kΩ(Typ.).
It sets cutoff frequency fc by the following formula by input coupling capacitor Ci (C3,C4, C6,C7) and input impedance Ri

fc

In case of Ri=36kΩ, Ci=0.1uF, it becomes fc=about 44Hz.

④The power decoupling capacitor (C5,C8)

It makes a power decoupling capacitor 10uF.
When making capacitance of the power decoupling capacitor small, there is an influence in the Audio characteristic.
When making small, careful for the Audio characteristic at the actual application.

8.0

VDDC1

[ms]

μ

5

1

[Hz]

CiRi2π

IC, BD5471MUV,
Stereo Class-D audio
amplifier

Printed-circuit board,
BD5471MUV EVM

4.0mm X 4.0mm
VQFN Package

― ―

Murata
GRM188R71C103KA01D

Murata
GRM188R61C225KE15D

Murata
GRM188R71C104KA01D

ROHM
TCFGA1A106M8R

ROHM
BD5471MUV

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© 2010 ROHM Co., Ltd. All rights reserved.

7/21

2010.06 - Rev.A