Small-sized Class-D Speaker Amplifiers
Analog Input
Monaural Class-D Speaker Amplifier
BD5468GUL
No.10101EAT08
●Description
BD5468GUL is a monaural Class-D speaker amplifier that contained ALC function for mobile phone, portable type
electronic devices etc. LC filter of speaker output is not needed, can form monaural speaker amplifier. with 3 external parts.
ALC, short for Automatic Level Control, is a function that automatically adjusts up to the level of suppression of distortion
(clip) of output wave form during excessive input. The time until the limit release operation of output level is called the
release time (or recovery time). This IC adopts high-speed release time (4ms/1dB Typ.) and suits the application which
repeats big volume in the short time such as the camera shutter sound.
Through Class-D operation, efficiency is high low power consumption that is why it’s suitable for battery drive application.
The current consumption during shutdown when lowered to 0.01μA(Typ.), from the shutdown to the operation time is early
and at the same time pop sound is few that is why its also suitable in repeating active and shutdown.
●Feature
1) Contains Digital ALC (Automatic Level Control) Function
2) External Parts: 3points
3) Ultra slim type package: 9pin WL-CSP(1.7×1.7×0.55mmMax.)
4) BD5460/61GUL (No ALC Function, Gain Fixed Goods) Pin Compatible Specs
BD5465/66/67GUL (ALC Function, Gain Fixed Goods) Pin Compatible Specs
5) Maximum Gain: 13dB (Typ.) [during ALC operation, 13½-2dB@1dB Step]
6) ALC high speed release (recovery) time: 4ms/1dB(Typ.)
7) Limit output power : 0.7W (Typ.) [VDD=4.2V, RL=8Ω, THD+N≦1%]
: 0.5W (Typ.) [VDD=3.6V, RL=8Ω, THD+N≦1%]
8) Audio Analog Input (corresponds to single-end input / differential input)
9) Output LC filter free
10) Pop noise suppression circuit
11) Shutdown Function (use as mute at the same time) [low shutdown current = 0.01μA (Typ.)]
12) Contains protection circuit: output short, thermal shutdown, under voltage lockout (UVLO)
●Applications
Mobile phone, Portable audio device, PND, DSC, Note-PC etc.
●Absolute
Maximum Rating (Ta=+25℃)
Parameter
Power Supply Voltage
Power Dissipation
Storage Temperature Range
SDNB Pin Input Range
IN+, IN- Pin Input Range
Symbol
VDDmax
PVDDmax
Pd
Tstg
V
SDNB
V
IN
Ratings
7.0
690
※
-55
½
+150
-0.3½VDD+0.3
-0.3½VDD+0.3
Unit
V
mW
℃
V
V
※
In case Ta=+25℃ or more, 5.52 mW decrease per 1℃
When mounting Rohm Typical Board 50.0mm×58.0mm (Material :Glass Epoxy)
●Operation
Range
Parameter
Temperature
Power Supply Voltage
Common Mode Input Voltage Range
Symbol
Topr
VDD
PVDD
V
IC
Range
-40
½
+85
+2.5
½
+5.5
+0.5
½
VDD-0.8
Unit
℃
V
V
◎
This product is not designed for protection against radioactive rays.
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© 2010 ROHM Co., Ltd. All rights reserved.
1/19
2010.09 - Rev.A
BD5468GUL
●Electrical
Characteristic (Ta=+25℃, VDD=+3.6V, Unless specified otherwise)
Parameter
＜All
Device＞
Circuit current (no signal)
Circuit current (shutdown)
＜Audio
Feature＞
Limit output power
Total harmonic distortion
Maximum Gain
ALC Limit level
ALC Release level
Switching frequency
Start-up time
Audio input resistance
＜Control
Terminal＞
SDNB terminal
Threshold voltage
H
L
H
L
V
SDNBH
V
SDNBL
I
SDBNH
I
SDNBL
1.4
0
12
-5
―
―
24
―
VDD
0.4
36
5
V
V
μA
μA
IC Active
P
O
T
HD+N
G
MAX
V
LIM
V
REL
f
OSC
T
ON
Ri
0.035
2
×VDD
―
12
1.5
×VDD
1.19
×VDD
150
0.73
36
0.044
2
×VDD
0.2
13
1.68
×VDD
1.34
×VDD
250
1.02
55
0.055
2
×VDD
1
14
1.89
×VDD
1.5
×VDD
350
1.71
74
W
%
dB
Vpp
Vpp
kHz
msec
kΩ
I
CC
I
SDN
―
―
3
0.01
6
2
mA
μA
Symbol
Limits
Min.
Typ.
Max.
Unit
Technical Note
Conditions
IC Active, No Load
V
SDNB
=VDD
IC Shutdown
V
SDNB
=GND
BTL, f=1kHz, R
L
=8Ω
THD+N≦1% ,
*1
BTL, fin=1kHz, R
L
=8Ω
P
O
=0.3W,
*1
BTL,
*1
BTL,
*1
BTL,
*1
Gain=13dB
IC Shutdown
V
SDNB
=3.6V
V
SDNB
=0V
SDNB terminal
Inflow Current
*1
Filter bandwidth for measurement :400½30kHz, LC filter for AC measurement :L=22μH / C=1μF, BTL :Voltage between A3,C3
●Shutdown
control
Control terminal
SDNB
H
L
●ALC
Parameter
Conditions
IC operation (active)
IC stop (shutdown)
ALC Parameter
Attack Time
(Typ.)
Release Time(Typ.)
4ms/1dB
@ fin=100½10kHz
Gain Switch Step (Typ.)
±1dB
½1ms/1dB
@ fin=100Hz
½0.5ms/1dB
@ fin=1kHz
½0.05ms/1dB
@ fin=10kHz
The gain switch timing during ALC operation occurs at zero cross point of audio output voltage.
For that, attack time, release time will change at input frequency “fin”.
ALC Parameter is fixed. ALC operation doesn’t correspond to noise of impulse.
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© 2010 ROHM Co., Ltd. All rights reserved.
2/19
2010.09 - Rev.A
BD5468GUL
●Measurement
Circuit Diagram
<Audio Characteristics Method of Evaluation >
■In
case LC filter is not used
+Battery
Technical Note
C3
10uF
VDD
B1
B2
PVDD
Shutdown Signal
H : IC Active
L : IC Shutdown
SDNB
C2
150k
(Typ .)
Shutdown
Control
BIAS
OSC
ALC
0. 1uF
IN +
A1
C2
Ri
Rf
H-
Bridge
OUT +
C3
PWM
0. 1uF
IN -
C1
C1
OUT -
A3
Ri
Rf
BTL
GND
A2
B3
PGND
LPF
AP AUX-0025
Measurement Instrument
Audio
Precision
(AP)
■In
case LC filter is used
+Battery
C3
10uF
VDD
B1
B2
PVDD
Shutdown Signal
H : IC Active
L : IC Shutdown
SDNB
C2
150k
(Typ .)
Shutdown
Control
BIAS
OSC
ALC
0. 1uF
C2
IN +
A1
Ri
Rf
H-
Bridge
22uH
C3
1 uF
1uF
A3
22uH
BTL
GND
A2
B3
PGND
Audio Precision
(AP )
PWM
0. 1uF
C1
IN -
C1
Ri
Rf
Audio characteristics can be measured to insert LC filter between output pin and speaker load, if you don’t have
measurement equipment for switching amplifier, like AUX-0025, Audio Precision.
Arrange the LC filter directly close to output pin.
In case of L=22μH, C=1μF, cut off frequency becomes:
34kHz
2
LC 2
22
H
1
F
For Inductor L, please use huge current type.
fc
½
1
½
1
(Reference)TDK : SLF12575T-220M4R0
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© 2010 ROHM Co., Ltd. All rights reserved.
3/19
2010.09 - Rev.A
BD5468GUL
●External
Dimension Diagram
Top View
Bottom View
Technical Note
5468
LOT No.
9pin WL-CSP (VCSP50L1)
[ 1.7×1.7×0.55mm Max, 0.5mm Pitch ]
(Unit : mm)
Side View
●Block
Diagram
●Pin
Arrangement (Bottom View)
VDD B1
B2 PVDD
SDNB
C2
150k
(Typ.)
Shutdown
Control
BIAS
C1
IN-
C2
SDNB
C3
OUT+
OSC
ALC
IN+
A1
PWM
IN-
C1
Ri
Rf
H-
Bridge
OUT-
A3
Ri
Rf
OUT+
C3
B1
Index Post
VDD
B2
PVDD
B3
PGND
A1
IN+
A2
GND
A3
OUT-
GND A2
B3 PGND
●Pin
Explanation
Pin No.
A1
A2
A3
B1
B2
B3
C1
C2
C3
Pin Name
IN+
GND
OUT-
VDD
PVDD
PGND
IN-
SDNB
OUT+
Explanation
Audio differential input+ terminal
GND terminal (signal)
Class-D BTL output - terminal
VDD terminal (signal)
VDD terminal (power)
GND terminal (power)
Audio differential input - terminal
Shutdown control terminal
Class-D BTL output+ terminal
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© 2010 ROHM Co., Ltd. All rights reserved.
4/19
2010.09 - Rev.A
BD5468GUL
●Application
circuit example
Technical Note
SHORT the power supply pin VDD (B1), PVDD (B2) at board pattern, then use singleness power supply.
Singleness power supply (+2.5½+5.5V)
+Battery
C3
10 uF
Signal VDD
Shutdown Control
Shutdown Signal
H: IC Active
L: IC Shutdown
SDNB
C2
VDD
B1
B2
PVDD
Power VDD
150k
(Typ.)
Shutdown
Control
BIAS
OSC
ALC
Audio
Input +
Differential
Input
0 .1 uF
IN+
A1
Class-D BTL Output
OUT +
C3
Ri
Rf
PWM
H-
Bridge
Audio
Input -
0 .1 uF
IN-
C1
OUT -
A3
Ri
Rf
Signal GND
GND
A2
B3
PGND
Audio Differential Input
Power GND
Fig1. Differential Input (With Input Coupling Capacitor)
+Battery
Singleness power supply(+2.5½+5.5V)
C3
10 uF
Shutdown Control
Shutdown Signal
H: IC Active
L: IC Shutdown
SDNB
C2
Signal VDD
VDD
B1
B2
PVDD
Power VDD
150k
(Typ.)
Shutdown
Control
BIAS
OSC
Class-D BTL Output
ALC
IN+
OUT +
C3
Audio
Input +
Differential
Input
A1
Ri
Rf
PWM
H-
Bridge
Audio
Input -
IN-
C1
OUT -
A3
Ri
Rf
Signal GND
GND
A2
B3
PGND
Audio Differential Input
Power GND
Fig2. Differential Input (Without Input Coupling Capacitor)
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© 2010 ROHM Co., Ltd. All rights reserved.
5/19
2010.09 - Rev.A
Analogue and Mixed Signal
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