1/28
s
OPERATING FROM V
CC
= 2.5V to 5.5V
s
1W RAIL TO RAIL OUTPUT POWER @
Vcc=5V, THD=1%, f=1kHz, with 8
Load
s
ULTRA LOW CONSUMPTION IN STANDBY
MODE (10nA)
s
75dB PSRR @ 217Hz from 5V to 2.6V
s
ULTRA LOW POP & CLICK
s
ULTRA LOW DISTORTION (0.1%)
s
UNITY GAIN STABLE
s
AVAILABLE IN SO8, MiniSO8 & DFN8 3x3mm
DESCRIPTION
The TS4871 is an Audio Power Amplifier capable
of delivering 1W of continuous RMS Ouput Power
into 8
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
thermal shutdown protection is also provided.
The TS4871 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.
APPLICATIONS
s
Mobile Phones (Cellular / Cordless)
s
Laptop / Notebook Computers
s
PDAs
s
Portable Audio Devices
ORDER CODE
MiniSO & DFN only available in Tape & Reel with T suffix(IST & IQT)
D = Small Outline Package (SO) - also available in Tape & Reel (DT)
PIN CONNECTIONS (Top View)
Part
Number
Temperature
Range: I
Package
Marking
D
S
Q
TS4871
-40, +85C
4871I
4871
Standby
Bypass
V +
IN
V
IN-
V
2
OUT
GND
V
CC
V
OUT1
1
2
3
4
8
7
6
5
Rin
Cin
Rstb
Cb
Rfeed
4
3
2
1
5
8
Vin-
Vin+
-
+
-
+
Bypass
Standby
Bias
6
Vout1
Vout2
Av=-1
TS4871
RL
8 Ohms
Vcc
GND
Audio
Input
Vcc
Vcc
Cfeed
Cs
7
TYPICAL APPLICATION SCHEMATIC
TS4871IST - MiniSO8
TS4871ID-TS4871IDT - SO8
Standby
Bypass
V +
IN
V
IN-
V
2
OUT
GND
V
CC
V
OUT1
1
2
3
4
8
7
6
5
1
2
3
4
5
8
7
6
STANDBY
BYPASS
V
OUT 2
V
IN-
V
IN+
Vcc
V
OUT 1
GND
1
2
3
4
5
8
7
6
STANDBY
BYPASS
V
OUT 2
V
IN-
V
IN+
Vcc
V
OUT 1
GND
TS4871IQT - DFN8
TS4871
OUTPUT RAIL TO RAIL 1W AUDIO POWER AMPLIFIER
WITH STANDBY MODE
June 2003
TS4871
2/28
ABSOLUTE MAXIMUM RATINGS
OPERATING CONDITIONS
Symbol
Parameter
Value
Unit
V
CC
Supply voltage
1)
6
V
V
i
Input Voltage
2)
G
ND
to V
CC
V
T
oper
Operating Free Air Temperature Range
-40 to + 85
C
T
stg
Storage Temperature
-65 to +150
C
T
j
Maximum Junction Temperature
150
C
R
thja
Thermal Resistance Junction to Ambient
3)
SO8
MiniSO8
QNF8
175
215
70
C/W
Pd
Power Dissipation
Internally Limited
4)
ESD
Human Body Model
2
kV
ESD
Machine Model
200
V
Latch-up Latch-up Immunity
Class A
Lead Temperature (soldering, 10sec)
260
C
1. All voltages values are measured with respect to the ground pin.
2. The magnitude of input signal must never exceed V
CC
+ 0.3V / G
ND
- 0.3V
3. Device is protected in case of over temperature by a thermal shutdown active @ 150C.
4. Exceeding the power derating curves during a long period, involves abnormal operating condition.
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
2.5 to 5.5
V
V
ICM
Common Mode Input Voltage Range
G
ND
to V
CC
- 1.2V
V
V
STB
Standby Voltage Input :
Device ON
Device OFF
G
ND
V
STB
0.5V
V
CC
- 0.5V
V
STB
V
CC
V
R
L
Load Resistor
4 - 32
R
thja
Thermal Resistance Junction to Ambient
1)
SO8
MiniSO8
DFN8
2)
150
190
41
C/W
1. This thermal resistance can be reduced with a suitable PCB layout (see Power Derating Curves Fig. 20)
2. When mounted on a 4 layers PCB
TS4871
3/28
ELECTRICAL CHARACTERISTICS
V
CC
= +5V, GND = 0V, T
amb
= 25C (unless otherwise specified)
V
CC
= +3.3V, GND = 0V, T
amb
= 25C (unless otherwise specified)
3)
Symbol
Parameter
Min.
Typ.
Max.
Unit
I
CC
Supply Current
No input signal, no load
6
8
mA
I
STANDBY
Standby Current
1)
No input signal, Vstdby = Vcc, RL = 8
1. Standby mode is actived when Vstdby is tied to Vcc
10
1000
nA
Voo
Output Offset Voltage
No input signal, RL = 8
5
20
mV
Po
Output Power
THD = 1% Max, f = 1kHz, RL = 8
1
W
THD + N
Total Harmonic Distortion + Noise
Po = 250mW rms, Gv = 2, 20Hz < f < 20kHz, RL = 8
0.15
%
PSRR
Power Supply Rejection Ratio
2)
f = 217Hz, RL = 8
,
RFeed = 22K
,
Vripple = 200mV rms
2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the surimposed sinus signal to Vcc @ f = 217Hz
75
dB
M
Phase Margin at Unity Gain
R
L
= 8
, C
L
= 500pF
70
Degrees
GM
Gain Margin
R
L
= 8
, C
L
= 500pF
20
dB
GBP
Gain Bandwidth Product
R
L
= 8
2
MHz
Symbol
Parameter
Min.
Typ.
Max.
Unit
I
CC
Supply Current
No input signal, no load
5.5
8
mA
I
STANDBY
Standby Current
1)
No input signal, Vstdby = Vcc, RL = 8
1. Standby mode is actived when Vstdby is tied to Vcc
10
1000
nA
Voo
Output Offset Voltage
No input signal, RL = 8
5
20
mV
Po
Output Power
THD = 1% Max, f = 1kHz, RL = 8
450
mW
THD + N
Total Harmonic Distortion + Noise
Po = 250mW rms, Gv = 2, 20Hz < f < 20kHz, RL = 8
0.15
%
PSRR
Power Supply Rejection Ratio
2)
f = 217Hz, RL = 8
,
RFeed = 22K
,
Vripple = 200mV rms
2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the surimposed sinus signal to Vcc @ f = 217Hz
3. All electrical values are made by correlation between 2.6V and 5V measurements
75
dB
M
Phase Margin at Unity Gain
R
L
= 8
, C
L
= 500pF
70
Degrees
GM
Gain Margin
R
L
= 8
, C
L
= 500pF
20
dB
GBP
Gain Bandwidth Product
R
L
= 8
2
MHz
TS4871
4/28
ELECTRICAL CHARACTERISTICS
V
CC
= 2.6V, GND = 0V, T
amb
= 25C (unless otherwise specified)
REMARKS
1. All measurements, except PSRR measurements, are made with a supply bypass capacitor Cs = 100F.
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 1s.
Symbol
Parameter
Min.
Typ.
Max.
Unit
I
CC
Supply Current
No input signal, no load
5.5
8
mA
I
STANDBY
Standby Current
1)
No input signal, Vstdby = Vcc, RL = 8
1. Standby mode is actived when Vstdby is tied to Vcc
10
1000
nA
Voo
Output Offset Voltage
No input signal, RL = 8
5
20
mV
Po
Output Power
THD = 1% Max, f = 1kHz, RL = 8
260
mW
THD + N
Total Harmonic Distortion + Noise
Po = 200mW rms, Gv = 2, 20Hz < f < 20kHz, RL = 8
0.15
%
PSRR
Power Supply Rejection Ratio
2)
f = 217Hz, RL = 8
,
RFeed = 22K
,
Vripple = 200mV rms
2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the surimposed sinus signal to Vcc @ f = 217Hz
75
dB
M
Phase Margin at Unity Gain
R
L
= 8
, C
L
= 500pF
70
Degrees
GM
Gain Margin
R
L
= 8
, C
L
= 500pF
20
dB
GBP
Gain Bandwidth Product
R
L
= 8
2
MHz
Components
Functional Description
Rin
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))
Cin
Input coupling capacitor which blocks the DC voltage at the amplifier input terminal
Rfeed
Feed back resistor which sets the closed loop gain in conjunction with Rin
Cs
Supply Bypass capacitor which provides power supply filtering
Cb
Bypass pin capacitor which provides half supply filtering
Cfeed
Low pass filter capacitor allowing to cut the high frequency
(low pass filter cut-off frequency 1 / (2 x Pi x Rfeed x Cfeed))
Rstb
Pull-up resistor which fixes the right supply level on the standby pin
Gv
Closed loop gain in BTL configuration = 2 x (Rfeed / Rin)
TS4871
5/28
Fig. 1 : Open Loop Frequency Response
Fig. 3 : Open Loop Frequency Response
Fig. 5 : Open Loop Frequency Response
Fig. 2 : Open Loop Frequency Response
Fig. 4 : Open Loop Frequency Response
Fig. 6 : Open Loop Frequency Response
0.3
1
10
100
1000
10000
-40
-20
0
20
40
60
-220
-200
-180
-160
-140
-120
-100
-80
-60
-40
-20
0
Vcc = 5V
RL = 8
Tamb = 25
C
G
a
in (dB
)
Frequency (kHz)
Gain
Phase
Phase (Deg)
0.3
1
10
100
1000
10000
-40
-20
0
20
40
60
80
-240
-220
-200
-180
-160
-140
-120
-100
-80
-60
-40
-20
0
Gai
n
(
d
B)
Frequency (kHz)
Vcc = 3.3V
RL = 8
Tamb = 25
C
Gain
Phase
Phase (
D
eg)
0.3
1
10
100
1000
10000
-40
-20
0
20
40
60
80
-240
-220
-200
-180
-160
-140
-120
-100
-80
-60
-40
-20
0
G
a
in (dB
)
Frequency (kHz)
Vcc = 2.6V
RL = 8
Tamb = 25
C
Gain
Phase
Phase (Deg)
0.3
1
10
100
1000
10000
-40
-20
0
20
40
60
-220
-200
-180
-160
-140
-120
-100
-80
-60
-40
-20
0
G
a
in (dB
)
Frequency (kHz)
Vcc = 5V
ZL = 8
+ 560pF
Tamb = 25
C
Gain
Phase
Phase (Deg)
0.3
1
10
100
1000
10000
-40
-20
0
20
40
60
80
-240
-220
-200
-180
-160
-140
-120
-100
-80
-60
-40
-20
0
G
a
in (dB
)
Frequency (kHz)
Vcc = 3.3V
ZL = 8
+ 560pF
Tamb = 25
C
Gain
Phase
Phase (Deg)
0.3
1
10
100
1000
10000
-40
-20
0
20
40
60
80
-240
-220
-200
-180
-160
-140
-120
-100
-80
-60
-40
-20
0
G
a
in (dB
)
Frequency (kHz)
Vcc = 2.6V
ZL = 8
+ 560pF
Tamb = 25
C
Gain
Phase
Phase (Deg)
PDF 
ZIP