Small-sized Class-D Speaker Amplifiers
Analog Input
Monaural Class-D Speaker Amplifiers
BD5632NUX,BD5634NUX,BD5638NUX
No.10101EAT04
●Description
BD5632NUX, BD5634NUX and BD5638NUX are a low voltage drive class-D speaker amplifier that was developed for
mobile phones, mobile audio products and the others. BD5632NUX has a fixed gain of 6dB, BD5634NUX has a fixed gain
of 12dB, and BD5638NUX has a fixed gain of 18dB. It is suitable for the application of battery drive because of high
efficiency and low power consumption. Also, stand-by current is 0µA (typ.), and fast transitions from standby to active with
little pop noise. It is suitable for applications that switch repeatedly between stand-by and active.
●Features
1) LC Filter less
2) Only 3 external components
3) High power 2.5W/4ohm/BTL
(VDD=5V, RL=4ohm, THD+N=10%, typ.)
4) High power 0.85W/8ohm/BTL (VDD=3.6V, RL=8ohm, THD+N=10%, typ.)
5) Analog differential input / PWM digital output
6) Pop noise suppression circuit
7) Standby function (Mute function)
8) Protection circuit
(Short protection [Auto recover without power cycling], Thermal shutdown, under voltage lockout)
9) Ultra small package VSON008X2030 (2.0×3.0×0.6mmMAX)
●Applications
Mobile phones, PND (Personal Navigation Device), DSC, PDA, etc
●Line
up matrix
Production Name
Gain (dB)
Input Impedance (kΩ)
Package
BD5632NUX
6
100
BD5634NUX
12
50
VSON008X2030
BD5638NUX
18
25
●Absolute
maximum ratings (Ta=25℃)
Parameter
Power Supply Voltage
Power Dissipation
Storage Temperature Range
STBY Terminal Input Range
IN+, IN- Terminal Input Range
Symbol
VDD
Pd
Tstg
Vstby
Vin
Ratings
7.0
0.52 *1
-55 ~ +150
-0.3 ~ VDD+0.3
-0.3 ~ VDD+0.3
Unit
V
W
℃
V
V
(*1) ROHM standard board mounted (Board size 70mm×70mm×1.6mmt, 1layer), de-rate the value 4.16mW/deg above Ta=+25deg.
●Operating
conditions
Parameter
Power Supply Voltage
Temperature Range
Symbol
VDD
Topr
Ratings
+2.5 ~ +5.5
-40 ~ +85
Unit
V
℃
*This product is not designed for protection against radioactive rays.
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© 2010 ROHM Co., Ltd. All rights reserved.
1/14
2010.06 - Rev.A
BD5632NUX, BD5634NUX, BD5638NUX
Technical Note
●Electric
characteristics
(Unless otherwise specified, Ta=+25deg, VDD=+3.6V, f=1 kHz, RL=8Ω, AC item=LC Filter; L=22µH, C=1µF)
Limits
Parameter
Symbol
Unit
Conditions
MIN.
TYP.
MAX.
Circuit current (No signal)
Circuit current (Standby)
Output power1
Output power2
Voltage gain (BD5632NUX)
Voltage gain (BD5634NUX)
Voltage gain (BD5638NUX)
Switching Frequency
Start-up time
STBY threshold voltage
Input impedance (STBY)
Input impedance (IN+/-)
(BD5632NUX)
Input impedance (IN+/-)
(BD5634NUX)
Input impedance (IN+/-)
(BD5638NUX)
fosc
Ton
V
STBY
R
STBY
G
V
I
CC
I
STBY
P
O1
P
O2
―
―
450
550
5.5
11.5
17.0
150
0.36
0.4
210
70
R
IN
35
17.5
2.7
0.1
680
850
6.0
12.0
18.0
250
0.51
―
300
100
50
25
5.4
2
―
―
6.5
12.5
19.0
350
0.85
1.4
390
130
65
32.5
kohm
kHz
msec
V
kohm
Active to standby shift
dB
BTL
mA
µA
mW
mW
Active mode, No load
Standby mode
BTL, f=1kHz, THD+N=1% *1
BTL, f=1kHz, THD+N=10% *1
*1:B.W. =20 kHz-LPF, BTL: The voltage between 5 pin and 8 pin
●Measurement
Circuit Diagram
V
STBY
A
STBY
1
Bias
OSC
8
OUT-
22µH
NC
2
0.47µF
IN+
Vin
0.47µF
7
GND
10µF
1µF
8Ω
V
V
V
BTL
V
SE
3
PWM
H-
Bridge
6
VDD
OUT+
22µH
1µF
Vin
IN-
4
5
V
V
SE
A
VDD
●Active/Standby
Control
STBY Pin (1pin)
Mode
Active
Standby
Pin Level
H
L
Conditions
IC Active
IC Shutdown
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© 2010 ROHM Co., Ltd. All rights reserved.
2/14
2010.06 - Rev.A
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