Datasheet
Low Power Consumption Class D Amplifier
9W+9W Analog Input
Class D Speaker Amplifier
BD28412MUV
General Description
BD28412MUV is a 9W+9W stereo (or 18W monaural)
class D amplifier, developed for battery equipped
speaker systems such as wireless speakers. This IC is
incorporated with a precise oscillator to generate
multiple switching frequencies that can avoid the AM
radio interference. In addition, 2.1Ch audio system can
be realized by master and slave operation without beat
noise caused by interference between two ICs.
Furthermore, this IC achieves lower power
consumption that eliminates the need for an external
heat sink.
Key Specifications
Supply Voltage Range:
4.5V to 13V
Speaker Output Power:
9W+9W (Typ)
(V
CC
=12V, R
L
=8Ω, PLIMIT=0V)
Speaker Output Power(PBTL):
18W (Typ)
(V
CC
=12V, R
L
=4Ω, PLIMIT=0V)
Total Harmonic Distortion Ratio:
0.03% (Typ) @Po=1W
(V
CC
=11V, R
L
=8Ω, PLIMIT=0V)
Crosstalk:
100dB (Typ)
PSRR:
55dB (Typ)
Output Noise Voltage:
-80dBV (Typ)
Standby Current:
0.1µA (Typ)
Operating Current:
16mA (Typ)
(No load or filter, No signal)
Operating Temperature Range:
-25°C to +85°C
Features
Analog Differential Input
Low Standby Current
Output Feedback Circuitry Prevents Sound
Quality Degradation Caused by Power Supply
Voltage Fluctuation, Achieves Low Noise and Low
Distortion, Eliminates the Need of Large
Electrolytic-Capacitors for Decoupling
Power Limit Function
(Linearly-programmable)
Selectable Switching Frequency
(AM Avoidance Function)
Synchronization Control is Supported
(Selectable Master and Slave Operation)
Parallel BTL (PBTL) is Supported
Wide Voltage Range (V
CC
=4.5V to 13V)
High Efficiency and Low-heat-generation Make
the System Smaller, Thinner, and More
Power-saving
Pop Noise Prevention During Power Supply
ON/OFF
High Reliability Design by Built-in Protection
Circuits
- Overheat Protection
- Under Voltage Protection
- Output Short Protection
- Output DC Voltage Protection
Small Package (VQFN032V5050) Achieves Mount
Area Reduction
Wireless Speakers, Small Active Speakers,
Portable Audio Equipments, etc.
PDX
Package
VQFN032V5050
W(Typ) x D(Typ) x H(Max)
5.00mm x 5.00mm x 1.00mm
VQFN032V5050
Typical Application Circuit
Applications
OUT1N
OUT2N
MUTEＸ
OUT1P
OUT2P
BSP1N
GAIN_ BSP2N
MS_SEL
BSP1P
FSEL<2:0>
BSP2P
ERRORX
MUTEＸ
PLIMIT
SYNC
Figure 1. Typical Application Circuit
〇Product
structure : Silicon monolithic integrated circuit
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TEST
IN1N
IN2N
IN1P
IN2P
PDX
BD28412MUV
Pin Configuration
(TOP VIEW)
Datasheet
ERRORX
VCCP1
32
31
30
29
28
NC
27
26
25
IN1P
1
BSP1P
REGA
VCCA
TEST
PDX
24
OUT1P
IN1N
2
23
GNDP1
PLIMIT
3
22
OUT1N
GNDA
4
21
BSP1N
REGG
5
20
BSP2P
GAIN_MS_SEL
6
19
OUT2P
IN2P
7
18
GNDP2
IN2N
8
17
OUT2N
9
SYNC
10
FSEL0
11
FSEL1
12
FSEL2
13
MUTEX
14
NC
15
VCCP2
16
BSP2N
Figure 2. Pin Configuration
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BD28412MUV
Pin Description
Pin
No.
1
Pin Name
IO
Function
Datasheet
Internal Equivalent Circuit
30kΩ~127.9kΩ
202.1kΩ~300kΩ
IN1P
I
Positive input pin for Ch1
1
+-
-+
2
2
IN1N
I
Negative input pin for Ch1
4
30kΩ~127.9kΩ 202.1kΩ~300kΩ
100kΩ
3
+
-
100kΩ
4
3
PLIMIT
I
Power limit level setting pin
4
GNDA
-
GND pin for Analog signal
Internal power supply pin for Gate driver
Please connect a capacitor.
27
5
REGG
O
5
The REGG terminal of BD28412MUV should not be
used as external supply. Therefore, do not connect
anything except the capacitor for stabilization and the
resistors for setting of GAIN_MS_SEL and PLIMIT.
200kΩ
4
2kΩ
6
6
GAIN_MS_SEL
I
Gain and Master/Slave mode Setting pin
4
30kΩ~127.9kΩ
202.1kΩ~300kΩ
7
IN2P
I
Positive input pin for Ch2
7
+-
-+
8
8
IN2N
I
Negative input pin for Ch2
4
30kΩ~127.9kΩ 202.1kΩ~300kΩ
5
9
SYNC
I/O
Clock input/output pin to synchronize
multiple class D amplifiers
9
100kΩ
4
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BD28412MUV
Pin Description – continued
10
Datasheet
10
FSEL0
I
PWM frequency setting pin 0
4
5
100kΩ
11
FSEL1
I
PWM frequency setting pin 1
11
100kΩ
4
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
FSEL2
MUTEX
NC
VCCP2
BSP2N
OUT2N
GNDP2
OUT2P
BSP2P
BSP1N
OUT1N
GNDP1
OUT1P
BSP1P
VCCP1
VCCA
NC
I
I
-
-
O
O
-
O
O
O
O
-
O
O
-
-
-
PWM frequency setting pin 2
Speaker output mute control pin
H: Mute OFF
L: Mute ON
Non connection
Power supply pin for Ch2 PWM signal
Please connect a capacitor.
Boot-strap pin of Ch2 negative PWM signal
Please connect a capacitor.
Output pin of Ch2 negative PWM signal
Please connect to output LPF.
GND pin for Ch2 PWM signal
Output pin of Ch2 positive PWM signal
Please connect to output LPF.
Boot-strap pin of Ch2 positive PWM signal
Please connect a capacitor.
Boot-strap pin of Ch1 negative PWM signal
Please connect a capacitor.
Output pin of Ch1 negative PWM signal
Please connect to output LPF.
GND pin for Ch1 PWM signal
Output pin of Ch1 positive PWM signal
Please connect to output LPF.
Boot-strap pin of Ch1 positive PWM signal
Please connect a capacitor.
Power supply pin for Ch1 PWM signal
Please connect a capacitor.
Power supply pin for Analog signal
Please connect a capacitor.
Non connection
Internal power supply pin for Gate driver
Please connect a capacitor.
12, 13
100kΩ
4
15
5
16, 20
17, 19
18
26
5
21, 25
22, 24
23
27
29
REGA
O
29
The REGA terminal of BD28412MUV should not be
used as external supply. Therefore, do not connect
anything except the capacitor for stabilization.
4
180kΩ
30
30
TEST
I
Test pin
Please connect to GND.
4
100k
Ω
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BD28412MUV
Pin Description – continued
27
Datasheet
Power down setting pin
31
PDX
I
H: Active
L: Standby
31
55kΩ
45kΩ
4
Error flag pin
Please connect to pull-up resistor.
H: Normal
L: Error detected
An error flag occurs when Output Short Protection, DC
Voltage Protection, or High Temperature Protection is
activated. This flag shows IC condition during operation.
The numerical value of internal equivalent circuit is typical value, not guaranteed value.
4
500Ω
32
32
ERRORX
O
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