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
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