TS4961T
Mono class D audio power amplifier with dedicated analog switch
Features
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QFN 16 3 x 3 mm
Wide operating voltage range from
V
CC
= 2.4 V to 4.3 V
Audio amplifier standby mode active low
Output power: 1.6 W at 4.2 V or 0.75 W at
3.0 V into 4
Ω
with 1% THD+N maximum
Output power: 0.95 W at 4.2 V or 0.45 W at
3.0 V into 8
Ω
with 1% THD+N maximum
Adjustable gain via external resistors
Low current consumption 2 mA at 3 V
Efficiency: 88% typical
Signal-to-noise ratio: 85 dB typical
PSRR: 63 dB typical at 217 Hz with 6 dB gain
PWM base frequency: 250 kHz
Low pop and click noise
Dual Power SPST with separated control
Ultra-high off-isolation on analog switch:
-80 dB typical from 20 Hz to 20 kHz
TS4961TIQT pinout
Applications
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Cellular telephones
PDAs
Notebook PCs
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Description
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The audio amplifying gain of the device can be
controlled via two external gain-setting resistors. It
is designed to operate from 2.4 to 4.3 V, making
this device ideal for portable applications.
The TS4961T is a smart combination of one
mono class D audio power amplifier and a
high-speed CMOS low-voltage dual power analog
SPST.
One of the key functions of this device is the
switch mode of the various audio signals coming
from the codec or baseband through the
loudspeaker. It can drive up to 1.6 W into a 4
Ω
load and 0.95 W into an 8
Ω
load. It achieves an
outstanding efficiency of up to 88% typical.
September 2008
Rev 1
1/49
www.st.com
49
Contents
TS4961T
Contents
1
2
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1
2.2
Audio amplifier section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Analog switch section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3
Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.1
3.2
Audio amplifier section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Analog switch section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4
Application component information . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 36
Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Wake-up time (t
WU
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Shutdown time (t
STBY
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Consumption in standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Output filter considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Examples with summed inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.9.1
4.9.2
Example 1: dual differential inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Example 2: one differential input plus one single-ended input . . . . . . . . 42
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4.10
Using the audio amplifier and switch on the same speaker . . . . . . . . . . . 43
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
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TS4961T
Absolute maximum ratings and operating conditions
1
Table 1.
Symbol
Absolute maximum ratings and operating conditions
Absolute maximum ratings
Parameter
Value
GND to 5.5
GND-0.3V / V
CC
+0.3V
-40 to + 85
-65 to +150
150
39
5
Unit
V
V
°C
°C
V
CCA
& V
CCS
Supply voltage
(1) (2)
V
in
T
oper
T
stg
T
j
R
thja
R
thjc
P
d
ESD
Input voltage
Operating free-air temperature range
Storage temperature
Maximum junction temperature
Thermal resistance junction to ambient
(3)
Thermal resistance junction to case
Power dissipation
Human body model
(5)
Machine model
(6)
Internally limited
(4)
Latch-up
V
STBY
Latch-up immunity of the Class D Amplifier (All Pins)
Latch-up immunity of the Analog Switch (Supply Pins)
Latch-up immunity of the Analog Switch Supply (I/O Pins)
Standby pin voltage maximum voltage
Lead temperature (soldering, 10 sec)
1. Caution: this device is not protected in the event of abnormal operating conditions, such as short-circuiting between any
one output pin and ground, between any one output pin and V
CC
, and between individual output pins.
2. All voltage values are measured with respect to the ground pin.
3. When mounted on a 4-layers PCB.
4. Exceeding the power derating curves during a long period provokes abnormal operating conditions.
5. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a 1.5 kΩ resistor
between two pins of the device. This is done for all couples of connected pin combinations while the other pins are floating.
6. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between two pins of the
device with no external series resistor (internal resistor < 5
Ω).
This is done for all couples of connected pin combinations
while the other pins are floating.
Table 2.
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°C/W
°C/W
kV
V
mA
V
°C
°C
200
200
100
200
GND-0.3V / V
CC
+0.3V
260
Operating conditions for audio amplifier section
Parameter
Supply voltage
(1)
Common mode input voltage range
(2)
Standby voltage input:
(3)
Class D amplifier ON
Class D amplifier OFF
(4)
Load resistor
Value
2.4 to 4.3
0.5 to V
CC
-0.8
1.4
≤
V
STBY
≤
V
CC
GND
≤
V
STBY
≤
0.4
≥
4
Unit
V
V
V
Ω
Symbol
V
CCA
V
IC
V
STBY
R
L
1. For V
CC
from 2.4 V to 2.5 V, the operating temperature range is reduced to 0° C≤ T
amb
≤70°
C.
2. For V
CC
from 2.4 V to 2.5 V, the common mode input range must be set at V
CC
/2.
3. Without any signal on V
STBY
, the device is in standby.
4. Minimum current consumption is obtained when V
STBY
= GND.
3/49
Absolute maximum ratings and operating conditions
Table 3.
Symbol
V
CC
V
in
V
IC
V
O
dt/dv
Supply voltage
Input voltage
Control input voltage
Output voltage
Input rise and fall time control input
V
CC
= 2.5 V
V
CC
= 3.0 V to 4.3 V
TS4961T
Operating conditions for analog switch section
Parameter
Value
2.4 to 4.3
0 to V
CC
0 to 4.3
0 to V
CC
0 to 20
ns/V
0 to 10
Unit
V
V
V
V
Table 4.
Audio amplifier standby mode settings
/STDBY
Low
High
Functional description
OFF
Device is in shut-down mode
ON
Device is in operating mode
Table 5.
Analog switch settings truth table
SLn
High
Low
Switch N°1
ON
D1 is connected to T1
OFF
High impedance from D1 to T1
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Switch N°2
ON
D2 is connected to T2
OFF
High impedance from D2 to T2
4/49
TS4961T
Table 6.
Name
VCCA
VCCS
/STDBY
T1
D2
SL2
OUT+
GNDA
OUT-
T2
GNDS
SL1
D1
NC
IN-
IN+
E-Pad
Absolute maximum ratings and operating conditions
Pin description
Pin number
6
2
12
1
3
4
5
7
8
9
10
11
13
14
15
16
-
Function
Class D audio amplifier power supply voltage input pin
Analog switch power supply voltage input pin
Standby input pin (active low) to disable the audio amplifier
Independent output audio channel 1
Common input audio channel 2
Select input pin for D2 to T2 (active high)
Positive differential audio output
Audio amplifier input ground
Negative differential audio output
Independent output audio channel 2
Analog switch input ground
Select input pin for D1 to T1 (active high)
Common input audio channel 1
No internal connection
Audio negative differential input
Audio positive differential input
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Exposed pad (should be connected to GND)
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