TS4890
RAIL TO RAIL OUTPUT
1W
AUDIO POWER AMPLIFIER WITH
STANDBY MODE
s
OPERATING FROM
V
CC
= 2.2V to 5.5V
s
1W
RAI L TO RAIL OUTPUT POWER @
Vcc=5V, THD=1%, f=1kHz, with
8
Ω
Load
MODE
(10nA)
PIN CONNECTIONS
(Top View)
s
ULTRA LOW CONSUMPTION IN STANDBY
s
75dB
PSRR @ 217Hz from 5 to 2.2V
s
POP & CLICK REDUCTION CIRCUITRY
s
ULTRA LOW DISTORTION
(0.1%)
s
UNITY GAIN STABLE
s
AVAILABLE IN
MiniSO8 & SO8
DESCRIPTION
The TS4890 (MiniSO8 & SO8) is an Audio Power
Amplifier capable of delivering 1W of continuous
RMS. ouput power into 8
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
thermal shutdown protection is also provided.
The TS4890 have 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
TS4890IS, TS4890IST - MiniSO8
Standby
Bypass
V
IN
+
V
IN-
1
2
3
4
8
7
6
5
V
OUT
2
GND
V
CC
V
OUT1
TS4890ID, TS4890IDT - SO8
Standby
Bypass
V
IN
+
V
IN-
1
2
3
4
8
7
6
5
V
OUT
2
GND
V
CC
V
OUT1
Audio
Input
Cin
Rin
4
3
Vin-
Vin+
-
+
Vcc
s
Mobile Phones (Cellular / Cordless)
s
Laptop / Notebook Computers
s
PDAs
s
Portable Audio Devices
ORDER CODE
Part Number
TS4890IST
TS4890IDT
Temperature
Range
-40, +85°C
Package
S
•
•
D
TYPICAL APPLICATION SCHEMATIC
Cfeed
Rfeed
Vcc
6
Cs
Vout1 5
RL
8 Ohms
Vcc
2
1
Bypass
Standby
Bias
GND
TS4890
-
Av=-1
+
Vout2
8
Rstb
Cb
7
S =
MiniSO Package (MiniSO) - also available in Tape & Reel (ST)
D =
Small Outline Package (SO) - also available in Tape & Reel (DT)
November 2001
1/31
TS4890
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
i
T
oper
T
stg
T
j
R
thja
Supply voltage
1)
Input Voltage
2)
Operating Free Air Temperature Range
Storage Temperature
Maximum Junction Temperature
Thermal Resistance Junction to Ambient
3)
SO8
MiniSO8
Power Dissipation
4)
Human Body Model
Machine Model
Latch-up Immunity
Lead Temperature (soldering, 10sec)
Parameter
Value
6
G
ND
to V
CC
-40 to + 85
-65 to +150
150
175
215
See Power Derating Curves
Fig. 24
2
200
Class A
260
W
kV
V
°C
Unit
V
V
°C
°C
°C
°C/W
Pd
ESD
ESD
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 may involve abnormal working of the device.
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)
SO8
MiniSO8
Parameter
Value
2.2 to 5.5
G
ND
+ 1V to V
CC
1.5
≤
V
STB
≤
V
CC
G
ND
≤
V
STB
≤
0.5
4 - 32
150
190
Unit
V
V
V
Ω
°C/W
1. This thermal resistance can be reduced with a suitable PCB layout (see Power Derating Curves Fig. 24)
2/31
TS4890
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 = G
ND
, 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
0.15
77
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 GND
2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the surimposed sinus signal to Vcc @ f = 217Hz
V
CC
=
+3.3V,
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 = G
ND
, 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
450
0.15
77
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 GND
2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the surimposed sinus signal to Vcc @ f = 217Hz
3/31
TS4890
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 = G
ND
, 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
10
5
260
0.15
77
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 GND
2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the surimposed sinus signal to Vcc @ f = 217Hz
V
CC
=
2.2V,
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 = G
ND
, 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 = 100mV 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
10
5
180
0.15
77
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 GND
2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the surimposed sinus signal to Vcc @ f = 217Hz
4/31
TS4890
Components
Rin
Cin
Rfeed
Cs
Cb
Cfeed
Rstb
Gv
Functiona l 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-down 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.
1.
External resistors are not needed for having better stability when supply @ Vcc down to 3V. The
quiescent current still remains the same.
2.
The standby response time is about 1µs.
5/31
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