TS4972
1.2W
AUDIO POWER AMPLIFIER
WITH STANDBY MODE ACTIVE HIGH
s
OPERATING FROM
V
CC
= 2.5V to 5.5V
s
RAIL TO RAIL
OUTPUT
s
1.2W OUTPUT POWER @ Vcc=5V, THD=1%,
F=1kHz, with
8
Ω
Load
MODE
(10nA)
PIN CONNECTIONS
(Top View)
TS4972JT - FLIP CHIP
s
ULTRA LOW CONSUMPTION IN STANDBY
s
75dB
PSRR @ 217Hz from 2.5 to 5V
s
LOW POP & CLICK
s
ULTRA LOW DISTORTION
(0.05%)
s
UNITY GAIN STABLE
s
FLIP CHIP PACKAGE 8 x 300µm bumps
DESCRIPTION
The TS4972 is an Audio Power Amplifier capable
of delivering 1.6W of continuous RMS ouput pow-
er into a 4
Ω
load @ 5V.
This Audio Amplifier is exhibiting 0.1% distortion
level (THD) from a 5V supply for a Pout = 250mW
RMS. An external standby mode control reduces
the supply current to less than 10nA. An internal
shutdown protection is provided.
The TS4972 has been designed for high quality
audio applications such as mobile phones and to
minimize the number of external components.
The unity-gain stable amplifier can be configured
by external gain setting resistors.
TYPICAL APPLICATION SCHEMATIC
Cfeed
Rfeed
VCC
6
Audio
Input
Cin
7
Vin+
+
RL
8 Ohms
-
VCC
Rin
1
Vin-
-
Vout 1
8
Cs
7
Vin
+
6
Vcc
5
Stdby
8
Vout1
Vout2
4
Vin
Gnd
Bypass
1
2
3
APPLICATIONS
s
Mobile Phones (Cellular / Cordless)
s
PDAs
s
Laptop/Notebook computers
s
Portable Audio Devices
ORDER CODE
Part
Number
TS4972IJT
Temperature
Range
-40, +85°C
Package
Marking
J
•
4972
VCC
Rstb
AV = -1
3
5
Bypass
Standby
+
Bias
GND
Cb
2
Vout 2
4
TS4972
J =
Flip Chip Package - only available in Tape & Reel (JT))
January 2003
1/28
TS4972
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
i
T
oper
T
stg
T
j
R
thja
Pd
Supply voltage
1)
Input Voltage
2)
Operating Free Air Temperature Range
Storage Temperature
Maximum Junction Temperature
Thermal Resistance Junction to Ambient
3)
Power Dissipation
Parameter
Value
6
G
ND
to V
CC
-40 to + 85
-65 to +150
150
200
Internally Limited
4)
2
200
Class A
250
Unit
V
V
°C
°C
°C
°C/W
kV
V
°C
ESD
Human Body Model
ESD
Machine Model
Latch-up Latch-up Immunity
Lead Temperature (soldering, 10sec)
1.
2.
3.
4.
All voltages values are measured with respect to the ground pin.
The magnitude of input signal must never exceed V
CC
+ 0.3V / G
ND
- 0.3V
Device is protected in case of over temperature by a thermal shutdown active @ 150°C.
Exceeding the power derating curves during a long period, involves abnormal operating condition.
OPERATING CONDITIONS
Symbol
V
CC
V
ICM
V
STB
R
L
R
thja
Supply Voltage
Common Mode Input Voltage Range
Standby Voltage Input :
Device ON
Device OFF
Load Resistor
Thermal Resistance Junction to Ambient
1)
2
Parameter
Value
2.5 to 5.5
G
ND
to V
CC
- 1.2V
G
ND
≤
V
STB
≤
0.5V
V
CC
- 0.5V
≤
V
STB
≤
V
CC
4 - 32
90
Unit
V
V
V
Ω
°C/W
1.
With Heat Sink Surface = 125mm
2/28
TS4972
ELECTRICAL CHARACTERISTICS
V
CC
=
+5V,
GND =
0V,
T
amb
= 25°C (unless otherwise specified)
Symbol
I
CC
I
STANDBY
Voo
Po
THD + N
PSRR
Φ
M
GM
GBP
Parameter
Supply Current
No input signal, no load
Standby Current
1)
No input signal, Vstdby = Vcc, RL = 8Ω
Output Offset Voltage
No input signal, RL = 8Ω
Output Power
THD = 1% Max, f = 1kHz, RL = 8Ω
Total Harmonic Distortion + Noise
Po = 250mW rms, Gv = 2, 20Hz < f < 20kHz, RL = 8Ω
Power Supply Rejection Ratio
2)
f = 217Hz, RL = 8Ω, RFeed = 22KΩ, Vripple = 200mV rms
Phase Margin at Unity Gain
R
L
= 8Ω, C
L
= 500pF
Gain Margin
R
L
= 8Ω, C
L
= 500pF
Gain Bandwidth Product
R
L
= 8Ω
Min.
Typ.
6
10
5
1.2
0.1
75
70
20
2
Max.
8
1000
20
Unit
mA
nA
mV
W
%
dB
Degrees
dB
MHz
1. Standby mode is actived when Vstdby is tied to Vcc
2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is an added sinus signal to Vcc @ f = 217Hz
V
CC
=
+3.3V,
GND =
0V,
T
amb
= 25°C (unless otherwise specified)
3)
Symbol
I
CC
I
STANDBY
Voo
Po
THD + N
PSRR
Φ
M
GM
GBP
Parameter
Supply Current
No input signal, no load
Standby Current
1)
No input signal, Vstdby = Vcc, RL = 8Ω
Output Offset Voltage
No input signal, RL = 8Ω
Output Power
THD = 1% Max, f = 1kHz, RL = 8Ω
Total Harmonic Distortion + Noise
Po = 250mW rms, Gv = 2, 20Hz < f < 20kHz, RL = 8Ω
Power Supply Rejection Ratio
2)
f = 217Hz, RL = 8Ω, RFeed = 22KΩ, Vripple = 200mV rms
Phase Margin at Unity Gain
R
L
= 8Ω, C
L
= 500pF
Gain Margin
R
L
= 8Ω, C
L
= 500pF
Gain Bandwidth Product
R
L
= 8Ω
Min.
Typ.
5.5
10
5
500
0.1
75
70
20
2
Max.
8
1000
20
Unit
mA
nA
mV
mW
%
dB
Degrees
dB
MHz
1. Standby mode is actived when Vstdby is tied to Vcc
2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is an added sinus signal to Vcc @ f = 217Hz
3. All electrical values are made by correlation between 2.6V and 5V measurements
3/28
TS4972
ELECTRICAL CHARACTERISTICS
V
CC
=
2.6V,
GND =
0V,
T
amb
= 25°C (unless otherwise specified)
Symbol
I
CC
I
STANDBY
Voo
Po
THD + N
PSRR
Φ
M
GM
GBP
Parameter
Supply Current
No input signal, no load
Standby Current
1)
No input signal, Vstdby = Vcc, RL = 8Ω
Output Offset Voltage
No input signal, RL = 8Ω
Output Power
THD = 1% Max, f = 1kHz, RL = 8Ω
Total Harmonic Distortion + Noise
Po = 200mW rms, Gv = 2, 20Hz < f < 20kHz, RL = 8Ω
Power Supply Rejection Ratio
2)
f = 217Hz, RL = 8Ω, RFeed = 22KΩ, Vripple = 200mV rms
Phase Margin at Unity Gain
R
L
= 8Ω, C
L
= 500pF
Gain Margin
R
L
= 8Ω, C
L
= 500pF
Gain Bandwidth Product
R
L
= 8Ω
Min.
Typ.
5.5
10
5
300
0.1
75
70
20
2
Max.
8
1000
20
Unit
mA
nA
mV
mW
%
dB
Degrees
dB
MHz
1. Standby mode is actived when Vstdby is tied to Vcc
2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is an added sinus signal to Vcc @ f = 217Hz
Components
Rin
Cin
Rfeed
Cs
Cb
Cfeed
Rstb
Gv
Functional Description
Inverting input resistor which sets the closed loop gain in conjunction with Rfeed. This resistor also
forms a high pass filter with Cin (fc = 1 / (2 x Pi x Rin x Cin))
Input coupling capacitor which blocks the DC voltage at the amplifier input terminal
Feed back resistor which sets the closed loop gain in conjunction with Rin
Supply Bypass capacitor which provides power supply filtering
Bypass pin capacitor which provides half supply filtering
Low pass filter capacitor allowing to cut the high frequency
(low pass filter cut-off frequency 1 / (2 x Pi x Rfeed x Cfeed))
Pull-up resistor which fixes the right supply level on the standby pin
Closed loop gain in BTL configuration = 2 x (Rfeed / Rin)
REMARKS
1.
All measurements, except PSRR measurements, are made with a supply bypass capacitor Cs = 100µF.
2.
External resistors are not needed for having better stability when supply @ Vcc down to 3V. By the way,
the quiescent current remains the same.
3.
The standby response time is about 1µs.
4/28
TS4972
Fig. 1 : Open Loop Frequency Response
0
60
Gain
Vcc = 5V
RL = 8
Ω
Tamb = 25
°
C
-20
-40
-60
Phase (Deg)
40
Phase
Gain (dB)
Fig. 2 : Open Loop Frequency Response
0
60
Gain
Vcc = 5V
ZL = 8
Ω
+ 560pF
Tamb = 25
°
C
-20
-40
-60
Phase (Deg)
Phase (Deg)
40
Gain (dB)
Phase
20
-80
-100
-120
-80
-100
-120
20
0
-140
-160
0
-140
-160
-20
-180
-200
-20
-180
-200
-40
0.3
1
10
100
Frequency (kHz)
1000
10000
-220
-40
0.3
1
10
100
1000
Frequency (kHz)
10000
-220
Fig. 3 : Open Loop Frequency Response
80
60
40
Gain (dB)
Fig. 4 : Open Loop Frequency Response
80
60
40
Phase
20
0
-20
-40
0.3
Gain
Vcc = 3.3V
ZL = 8
Ω
+ 560pF
Tamb = 25
°
C
0
-20
-40
-60
-80
-100
-120
-140
-160
-180
-200
-220
1
10
100
1000
Frequency (kHz)
10000
-240
Phase (Deg)
0
Gain
Vcc = 33V
RL = 8
Ω
Tamb = 25
°
C
-20
-40
-60
-100
-120
-140
-160
-180
-200
-220
-240
Phase (Deg)
Gain (dB)
-80
Phase
20
0
-20
-40
0.3
1
10
100
1000
Frequency (kHz)
10000
Fig. 5 : Open Loop Frequency Response
Fig. 6 : Open Loop Frequency Response
80
Gain
60
40
Phase (Deg)
Gain (dB)
80
60
40
Gain (dB)
0
Gain
Vcc = 2.6V
RL = 8
Ω
Tamb = 25
°
C
-20
-40
-60
-80
Phase
-100
-120
-140
-160
-180
-200
-220
-240
0
Vcc = 2.6V
ZL = 8
Ω
+ 560pF
Tamb = 25
°
C
-20
-40
-60
-80
Phase
-100
-120
-140
-160
-180
-200
-220
-240
20
0
-20
-40
0.3
20
0
-20
-40
0.3
1
10
100
1000
Frequency (kHz)
10000
1
10
100
1000
Frequency (kHz)
10000
5/28
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