ROHM BD5426MUV

Middle Power Class-D Speaker Amplifiers
Analog Input / BTL Output
Class-D Speaker Amplifier
BD5426MUV
No.10075EBT08
●Description
BD5426MUV is a 10W + 10W 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 87% (9W + 9W 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 20W. 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 87% (9W + 9W output with 8Ω load), which is the highest grade in the industry and low heat-generation.
2) An output of 10W + 10W (13V, with 8Ω load) is allowed without an external heat radiator.
3) Driving a lowest rating load of 6Ω 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 (250 kHz 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.
Symbol
Ratings
Unit
VCC
+20
V
Power dissipation
Pd
3.28
4.8
W
W
Pin 2, 14, 15, 22, 23, 38, 39, 46, 47
(Note 1, 2)
(Note 3)
(Note 4)
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)
VOSC
-0.2 ~ +7.2
V
Pin 31 (Note 1)
Operating temperature range
Topr
-40 ~ +85
℃
Storage temperature range
Tstg
-55 ~ +150
℃
Tjmax
+150
℃
Parameter
Supply voltage
Input voltage for clock pin
Maximum junction temperature
Conditions
(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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© 2010 ROHM Co., Ltd. All rights reserved.
1/15
2010.05 - Rev.B
Technical Note
BD5426MUV
●Operating conditions
The following values assume Ta =25℃. Check for latest values in delivery specifications.
Parameter
Symbol
Ratings
Unit
Conditions
Supply voltage
VCC
+10 ~ +16.5
V
Pin 2, 14, 15, 22, 23, 38, 39, 46, 47
Load resistance
RL
6 ~ 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.
Symbol
Limits
Unit
Circuit current 1 (Sampling mode)
ICC1
25
mA
With no signal
Circuit current 2 (Muting mode)
ICC2
10
mA
MUTEX = “L”
“H” level input voltage
VIH
2.3 ~ 12
V
SDX, MUTEX, MS
“L” level input voltage
VIL
0 ~ 0.8
V
SDX, MUTEX, MS
GV
28
dB
PO = 1W
Maximum output power 1 (Note 6)
PO1
9
W
THD+N = 10%
Maximum output power 2 (Note 6)
PO2
10
W
Vcc=13V, THD+N = 10%
Total harmonic distortion (Note 6)
THD
0.1
%
PO = 1W, BW=20Hz ~ 20kHz
CT
85
dB
PO = 1W, Rg = 0Ω, BW = IHF-A
Output noise voltage (Sampling mode)
VNO
80
µVrms
Rg = 0Ω, BW = IHF-A
Residual noise voltage (Muting mode)
VNOM
1
µVrms
Rg = 0Ω, BW = IHF-A, MUTEX = “L”
Internal sampling clock frequency
FOSC
250
kHz
Parameter
Conditions
Whole circuit
Control circuit
Audio circuit
Voltage gain
Crosstalk
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.
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© 2010 ROHM Co., Ltd. All rights reserved.
2/15
2010.05 - Rev.B
Technical Note
BD5426MUV
●Electrical characteristic curves (Reference data)
(1) Under Stereo Operation(RL=8Ω)
100
100
Vcc=12V
R L=8Ω
BW=20～20kHz
10
THD+N (%)
THD+N (%)
10
6kHz
1
0.1
Vcc=12V
RL=8Ω
Po=1W
BW=20～20kHz
1
0.1
1kHz
100Hz
0.01
0.001
0.01
Fig. 1
0.1
1
10
0.01
100
10
100
OUTPUT POWER (W)
THD+N - Output power
1000
10000
FREQUENCY (Hz)
Fig. 2 THD+N - Frequency
40
0
Vcc=12V
RL=8Ω
Po=1W
BW=20～20kHz
-20
30
25
CROSSTALK (dB)
VOLTAGE GAIN (dB)
35
Vcc=12V
RL=8Ω
Po=1W
L=33µH
C=0.47µF
Cｇ=0.1µF
20
15
10
5
10
-40
-60
-80
0
100
1000
10000
-100
100000
10
100
FREQUENCY (Hz)
Fig. 4
0
OUTPUT POWER (W)
RL=8Ω
fin=1kHz
-40
-60
-80
-100
0.001
0.01
0.1
1
10
15
Crosstalk - Frequency
THD=10%
10
5
8
Fig. 5 Crosstalk - Output power
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100000
0
100
OUTPUT POWER (W)
© 2010 ROHM Co., Ltd. All rights reserved.
10000
20
Vcc=12V
RL=8Ω
fin=1kHz
BW=20～20kHz
-20
1000
FREQUENCY (Hz)
Fig. 3 Voltage gain - Frequency
CROSSTALK (dB)
100000
10
12
14
VCC (V)
16
18
Fig. 6 Output power - Power supply voltage
3/15
2010.05 - Rev.B
Technical Note
BD5426MUV
100
90
80
70
60
50
40
30
20
10
0
Vcc=10V
RL=8Ω
fin=1kHz
0
5
10
15
100
90
80
70
60
50
40
30
20
10
0
EFFICIENCY (%)
EFFICIENCY (%)
●Electrical characteristic curves (Reference data) – Continued
Vcc=12V
RL=8Ω
fin=1kHz
0
20
5
Fig. 7 Efficiency - Output power
20
Fig. 8 Efficiency - Output power
3
100
90
80
70
60
50
40
30
20
10
0
Vcc=16.5V
Vcc=12V
2
Vcc=10V
ICC (A)
EFFICIENCY (%)
15
OUTPUT POWER (W/ch)
OUTPUT POWER (W/ch)
Vcc=16.5V
RL=8Ω
fin=1kHz
0
5
10
15
1
RL=8Ω
fin=1kHz
0
20
0
5
OUTPUT POWER (W/ch)
Fig. 9 Efficiency - Output power
100
90
80
70
60
50
40
30
20
10
0
10 15 20 25 30 35
TOTAL OUTPUT POWER (W)
40
Fig. 10 Current consumption - Output power
0
=8Ω
RRLL=8Ω
無信号時
Without
signal
VVcc=12V
CC=12V
RL=8Ω
RL=8Ω signal
Without
無信号時
BW=20～20kHz
-20
NOISE FFT (dBV)
ICC (mA)
10
Sampling
-40
BW=20～20kHz
-60
-80
-100
-120
Mute
-140
8
10
12
14
VCC (V)
16
10
18
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1000
10000
100000
FREQUENCY (Hz)
Fig. 11 Current consumption - Power supply voltage
© 2010 ROHM Co., Ltd. All rights reserved.
100
4/15
Fig. 12 FFT of Output Noise Voltage
2010.05 - Rev.B
Technical Note
BD5426MUV
●Electrical characteristic curves (Reference data) – Continued
MUTEX
Pin 28
10V/div
TM
Pin 34
5V/div
MUTEX
Vcc=12V
Pin 28
RL =8 Ω
Po=500m W
fin=500Hz
TM
Pin 34
10V/div
5V/div
2V/div
2V/div
Speaker
output
Vcc=12V
RL =8 Ω
Po=500mW
fin=500Hz
Speaker
output
10msec/div
10msec/div
Fig. 13 Wave form when Releasing Soft-mute
Fig. 14 Wave form when Activating Soft-mute
VCCA
VCCA
VHOLD
Pin 35
5V/div
TM
Pin 34
5V/div
VHOLD
Vcc=12V
Pin 35
RL =8 Ω
Po=500m W
TM
fin=3kHz
Pin 34
2V/div
Speaker
output
Speaker
output
Soft Clip
5V/div
2V/div
2msec/div
Fig. 15 Wave form on Instantaneous
Power Interruption(20msec / div)
5V/div
Vcc=12V
RL =8 Ω
Po=500mW
fin=3kHz
Speaker
output
20msec/div
Soft Clip
5V/div
Fig. 16 Wave form on Instantaneous
Power Interruption(2msec / div)
Vcc=12V
RL =8 Ω
Po=5W
THD+n=10%
fin=1kHz
R8=91k Ω
R9=22k Ω
200 μsec/div
Fig. 17 Wave form on Output Power Limiter function
(Po = 5W)
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© 2010 ROHM Co., Ltd. All rights reserved.
5/15
2010.05 - Rev.B
Technical Note
BD5426MUV
●Electrical characteristic curves (Reference data) – Continued
(2) Under Stereo Operation(RL=6Ω)
OUTPUT POWER (W)
25
RL=6Ω
fin=1kHz
20
THD=10%
15
10
5
0
8
10
12
14
16
18
VCC (V)
100
90
80
70
60
50
40
30
20
10
0
Vcc=10V
RL=6Ω
fin=1kHz
0
5
10
15
20
100
90
80
70
60
50
40
30
20
10
0
EFFICIENCY (%)
EFFICIENCY (%)
Fig. 18 Output power - Power supply voltage
Vcc=12V
RL=6Ω
fin=1kHz
0
25
Efficiency - Output power
Fig. 20
15
20
25
Efficiency - Output power
4
100
90
80
70
60
50
40
30
20
10
0
Vcc=16.5V
3
Vcc=12V
Vcc=10V
Vcc=16.5V
RL=6Ω
fin=1kHz
ICC (A)
EFFICIENCY (%)
10
OUTPUT POWER (W/ch)
OUTPUT POWER (W/ch)
Fig. 19
5
2
RL=6Ω
fin=1kHz
1
0
0
5
10
15
20
OUTPUT POWER (W/ch)
Fig. 21
25
0
Efficiency - Output power
5
10 15 20 25 30 35 40 45 50
TOTAL OUTPUT POWER (W)
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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© 2010 ROHM Co., Ltd. All rights reserved.
6/15
2010.05 - Rev.B
Technical Note
BD5426MUV
●Block diagram
PLMT2
PLMT1
IN1
IN2
GNDA
FILA
FILP
VCCA
BSP2P
10
9
8
7
6
5
4
3
2
1
FILA
Power Limit
N.C. 13 N.C.
VCCA
PLMT3
11
FILP
PLMT4
12
GNDA
BSP1P
Top View
N.C. 48 N.C.
VCCP1P 14
47 VCCP2P
VCCP1P 15
46 VCCP2P
PWM1 PWM2
OUT1P 16
DRIVER
1P
OUT1P 17
45 OUT2P
DRIVER
2P
44 OUT2P
GNDP1 18
43 GNDP2
GNDP1 19
42 GNDP2
OUT1N 20
DRIVER
1N
OUT1N 21
40 OUT2N
Under Voltage Protection
High Temperature Protection
VCCP1N 22
39 VCCP2N
Output Short Protection
Output DC Voltage Protection
Ramp
Generator
SOFT
MUTE
Power-Off
Detector
33
34
35
36
ROSC
TM
VHOLD
BSP2N
Mute
Control
Clock
Control
32
MS
ERROR
31
OSC
WARNING
38 VCCP2N
N.C. 37 N.C.
N.C. N.C.
28
29
30
N.C.
27
N.C.
26
MUTEX
25
BSP1N
24 N.C.
ERROR
WARNING
VCCP1N 23
N.C.
41 OUT2N
DRIVER
2N
Protections & Logic
Fig. 23 Pin Assignment Diagram
●Outer Dimensions and Inscriptions
TYPE
BD5426
1PIN MARK
Lot No.
Fig. 24 Outer Dimensions and Inscriptions of VQFN048V7070 Package
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© 2010 ROHM Co., Ltd. All rights reserved.
7/15
2010.05 - Rev.B
Technical Note
BD5426MUV
●Explanation of Pin Functions (Provided pin voltages are typical values.)
No.
Symbol
Pin voltage
Pin description
2
VCCA
Vcc
Internal equalizing circuit
Analog system power pin
2
3
FILP
Vcc+35
12
PWM system bias pin
3
Connect a capacitor.
5
2
Analog signal system bias pin
4
FILA
3.5V
4
Connect a capacitor.
5
5
GNDA
0V
Analog system GND pin
2
6
7
IN2
IN1
3.5V
ch2 Analog signal input pin
ch1 Analog signal input pin
20k
6/7
Input audio signal via a capacitor.
5
2
8
PLMT1
3.5V
Voltage-to-current conversion pin for
output power limiter function
8
Connect a register.
5
2
9
PLMT2
-
Current-to-voltage conversion pin for
output power limiter function
9
Connect a register.
5
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© 2010 ROHM Co., Ltd. All rights reserved.
8/15
2010.05 - Rev.B
Technical Note
BD5426MUV
●Explanation of Pin Functions - Continued
No.
Symbol
Pin voltage
Pin description
Internal equalizing circuit
2
10
PLMT3
-
Current-to-voltage conversion pin for
output power limiter function
10
Connect a register.
5
2
Bias pin for output power limiter function
11
PLMT4
3.5V
Connect a register and a capacitor.
11
5
12
BSP1P
-
ch1 positive bootstrap pin
Connect a capacitor.
1 4,1 5
12
14, 15
VCCP1P
Vcc
16, 17
OUT1P
Vcc ~ 0V
ch1 positive power system power supply pin
1 6,1 7
ch1 positive PWM signal output pin
Connect with output LPF.
1 8,1 9
2 2 ,2 3
18, 19
GNDP1
0V
ch1 power system GND pin
25
20, 21
OUT1N
Vcc ~ 0V
22, 23
VCCP1N
Vcc
ch1 negative PWM signal output pin
Connect with output LPF.
2 0 ,2 1
ch1 negative power system power supply
pin
1 8 ,1 9
25
BSP1N
-
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© 2010 ROHM Co., Ltd. All rights reserved.
ch1 negative bootstrap pin
Connect a capacitor
9/15
2010.05 - Rev.B
Technical Note
BD5426MUV
●Explanation of Pin Functions - Continued
No.
Symbol
Pin voltage
Pin description
Internal equalizing circuit
2
Warning output pin
26
WARNING
H: 5V
L: 0V
Pin to notify operation warning.
H: Under warning
L: Normal operation
2k
26
Connect a resister.
5
2
Error output pin
27
ERROR
H: 5V
L: 0V
A pin for notifying operation errors.
2k
27
H: Error
L: Normal operation
Connect a resister.
5
2
Audio mute control pin
MUTEX
-
120k
28
H: Mute off
L: Mute on
80k
28
5
13, 24
29, 30
37,48
N.C.
-
N.C. pin
Nothing is connected with IC internal circuit.
2
Sampling clock signal input/output pin
31
OSC
-
When using two or more sampling clocks,
connect via a capacitor.
31
5
2
Master/Slave switching pin
MS
-
Switching of master/slave functions on a
sampling clock signal.
H: Slave operation
L: Master operation
32
120k
80k
32
5
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© 2010 ROHM Co., Ltd. All rights reserved.
10/15
2010.05 - Rev.B
Technical Note
BD5426MUV
●Explanation of Pin Functions - Continued
No.
Symbol
Pin voltage
Pin description
Internal equalizing circuit
2
ROSC
5.6V
33
32k
33
Internal PWM sampling clock frequency
setting pinUsually the pin is used open.
To adjust an internal sampling clock
frequency, connect a resister.
5
2
Audio muting constant setting pin
34
TM
0 ~ 5V
34
Connect a capacitor.
5
2
VHOLD
0.68×Vcc
Connect a capacitor.
To adjust a detecting voltage, connect a
resister.
35
390k
35
180k
Instantaneous power interruption
detecting voltage setting pin
5
36
BSP2N
-
ch2 negative bootstrap pin
Connect a capacitor.
3 8 ,3 9
36
38, 39
VCCP2N
Vcc
40, 41
OUT2N
Vcc ~ 0V
ch2 negative power system power supply
pin
4 0 ,4 1
ch2 negative PWM signal output pin
Connect an output LPF.
4 2 ,4 3
42, 43
GNDP2
0V
44, 45
OUT2P
Vcc ~ 0V
cch2 power system GND pin
ch2 positive PWM signal output pin
Connect an output LPF.
4 6 ,4 7
1
4 4 ,4 5
46, 47
VCCP2P
Vcc
1
BSP2P
-
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© 2010 ROHM Co., Ltd. All rights reserved.
ch2 positive power system power supply pin
ch2 positive bootstrap pin
Connect a capacitor.
11/15
4 2 ,4 3
2010.05 - Rev.B
Technical Note
BD5426MUV
●Application Circuit Diagram
C2
10μF
VCCP1
+
C3
1μF
N.C. 13 N.C.
4
3
2
1
VCCA
5
0.1μF
C5
6
Power Limit
C12
0.68μF
VCCA
GNDA
SP INPUT 2ch
SP INPUT 1ch
7
FILP
8
C4
10μF
9
2.2μF
R8
22kΩ
10
FILA
11
GNDA
12
C7 2.2μF
R9
22kΩ
R10
22kΩ
C6
C11
0.1μF
GNDA
GNDA
・Vcc=10V ~ 16.5V
N.C. 48 N.C.
14
16
DRIVER
1P
17
43
19
42
20
21
Protections & Logic
39
Output Short Protection
Output DC Voltage Protection
SOFT
MUTE
C38
0.1μF
Power-Off
Detector
33
34
35
C41
0.47μF
GNDP2
SP 2ch
(8Ω)
33μH
L40
C36
0.68μF
N.C. 37 N.C.
31
32
36
3.3μF
C35
30
0.1μF
29
GNDD
27
C40
0.1μF
38
C34
26
C44
0.1μF
+ C39
10μF
N.C. N.C.
28
N.C.
25
Mute
Control
N.C. 24 N.C.
ERROR
WARNING
23
WARNING OUTPUT
R26
GNDD 100kΩ
ERROR OUTPUT
R27
GNDD 100kΩ
MUTEX
C25
0.68μF
40
Under Voltage Protection
High Temperature Protection
22
L44
33μH
41
DRIVER
2N
Ramp
Generator
C22
0.1μF
DRIVER
1N
OPEN
33μH
L20
44
18
Clock
Control
C20
0.1μF
C46
0.1μF
45
DRIVER
2P
0.1μF
C16
0.1μF
46
PWM1 PWM2
MASTER
SLAVE
GNDP1
15
C31
SP 1ch
(8Ω)
C14
0.1μF
CAREER I/O
C17
0.47μF
L16
33μH
VCCP2
47
N.C.
C15
10μF +
C1
0.68μF
Fig. 25 Circuit Diagram of Stereo Operation with 8Ω Load
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© 2010 ROHM Co., Ltd. All rights reserved.
12/15
2010.05 - Rev.B
Technical Note
BD5426MUV
Table 1 BOM List of Stereo Operation with 8Ω Load
Configuration
Value
Rated
voltage
Tolerance
Temperature
characteristics
Quantity
-
-
-
-
1
IC1
0805
0.68µF
25V
±10%
±10%
4
C1, C12, C25, C36
1608
0603
0.1µF
50V
±10%
±15%
5
C5, C14, C22, C38, C46
MURATA
2012
0805
0.1µF
50V
±10%
±10%
4
C16, C20, C40, C44
25ST225M3216
Rubycon
3225
1210
2.2µF
25V
±20%
±5%
2
C6, C7
C
50ST474M3225
Rubycon
3225
1210
0.47µF
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
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
Value
Tolerance
DC
Resistance
Rated
DC Current
Quantity
14
L
33µH×2
±20%
44mΩmax.
4.1A max.
2
No.
Item
Part Number
1
IC
BD5426MUV
2
C
GRM219B31E684KA88
MURATA
2012
3
C
GRM188R11H104KA93
MURATA
4
C
GRM21BB11H104KA01
5
C
6
Part Number
7G09B-330M
Vendor
ROHM
Vendor
SAGAMI
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
mm
inch
VQFN048V7070
Configuration
mm
10×9×10
13/15
Reference
Reference
L16, L20, L40, L44
2010.05 - Rev.B
Technical Note
BD5426MUV
●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.
T jmax - Ta
Tjmax: Maximum temperature junction = 150[℃]
Pd 
〔W〕
Maximum power dissipation
θj a
Ta: Operating ambient temperature [℃]
θja: Package thermal resistance [℃/W]


 1

Po: Output power [W]
Pdiss  PO 
- 1  〔W〕
Power dissipation
 η



η: Efficiency
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 IC when installing it onto the board. Faulty installation may destroy the
IC when the device is energized. In addition, a foreign matter getting in between IC pins, pins and power supply, and
pins and GND may cause shorting and destruction of the IC.
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.
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
14/15
2010.05 - Rev.B
Technical Note
BD5426MUV
●Ordering part number
B
D
5
Part No
4
2
6
Part No.
M
U
-
V
Package
MUV: VQFN048V7070
E
2
Packaging and forming specification
E2: Embossed tape and reel
VQFN048V7070
<Tape and Reel information>
7.0±0.1
7.0 ± 0.1
1.0MAX
4.7 ± 0.1
1
12
1500pcs
E2
The direction is the 1pin of product is at the upper left when you hold
)
(0.22)
( reel on the left hand and you pull out the tape on the right hand
13
4.7±0.1
0.4±0.1
48
+0.03
0.02 -0.02
S
C0.2
Embossed carrier tape
Quantity
Direction
of feed
1PIN MARK
0.08 S
Tape
37
24
36
0.75
0.5
25
+0.05
0.25 -0.04
1pin
(Unit : mm)
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
Reel
15/15
Direction of feed
∗ Order quantity needs to be multiple of the minimum quantity.
2010.05 - Rev.B
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specified herein is subject to change for improvement without notice.
The content specified 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 specifications,
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 specified 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 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 and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specified in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices).
The Products specified 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, fire or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, fire 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 specified 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
http://www.rohm.com/contact/
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
R1010A