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s
OPERATING FROM Vcc=2V to 5.5V
s
STANDBY MODE ACTIVE HIGH (TS419) or
LOW (TS421)
s
OUTPUT POWER into 16
: 367mW @ 5V
with 10% THD+N max or 295mW @5V and
110mW @3.3V with 1% THD+N max.
s
LOW CURRENT CONSUMPTION: 2.5mA max
s
High Signal-to-Noise ratio: 95dB(A) at 5V
s
PSRR: 56dB typ. at 1kHz, 46dB at 217Hz
s
SHORT CIRCUIT LIMITATION
s
ON/OFF click reduction circuitry
s
Available in SO8, MiniSO8 & DFN 3x3
DESCRIPTION
The TS419/TS421 is a monaural audio power am-
plifier driving in BTL mode a 16 or 32
earpiece or
receiver speaker. The main advantage of this con-
figuration is to get rid of bulky ouput capacitors.
Capable of descending to low voltages, it delivers
up to 220mW per channel (into 16
loads) of con-
tinuous average power with 0.2% THD+N in the
audio bandwidth from a 5V power supply.
An externally controlled standby mode reduces
the supply current to 10nA (typ.). The TS419/
TS421 can be configured by external gain-setting
resistors or used in a fixed gain version.
APPLICATIONS
s
16/32 ohms earpiece or receiver speaker driver
s
Mobile and cordless phones (analog / digital)
s
PDAs & computers
s
Portable appliances
ORDER CODE
MiniSO & DFN only available in Tape & Reel with T suffix.
SO is available in Tube (D) and in Tape & Reel (DT)
PIN CONNECTIONS (top view)
Part
Number
Temp.
Range:
I
Package
Gain
Marking
D
S
Q
TS419
-40, +85C
external
TS419I
TS421
external
TS421I
TS419
external
K19A
TS419-2
tba tba
x2/6dB
K19B
TS419-4
tba tba x4/12dB
K19C
TS419-8
tba tba x8/18dB
K19D
TS421
external
K21A
TS421-2
tba tba
x2/6dB
K21B
TS421-4
tba tba x4/12dB
K21C
TS421-8
tba tba x8/18dB
K21D
TS419IDT: SO8
TS419IST, TS419-xIST: MiniSO8
Standby
Bypass
V +
IN
V
IN-
V
2
OUT
GND
V
CC
V
OUT1
1
2
3
4
8
7
6
5
TS421IDT: SO8
TS421IST, TS421-xIST: MiniSO8
TS419IQT, TS419-xIQT: DFN8
TS421IQT, TS421-xIQT: DFN8
1
2
3
4
5
8
7
6
STANDBY
BYPASS
V
IN+
Vcc
V
OUT 1
GND
V
IN-
V
OUT 2
1
2
3
4
5
8
7
6
STANDBY
BYPASS
V
IN+
Vcc
V
OUT 1
GND
V
IN-
V
OUT 2
1
2
3
4
5
8
7
6
STANDBY
BYPASS
V
IN+
Vcc
V
OUT 1
GND
V
IN-
V
OUT 2
1
2
3
4
5
8
7
6
STANDBY
BYPASS
V
IN+
Vcc
V
OUT 1
GND
V
IN-
V
OUT 2
TS419
TS421
360mW MONO AMPLIFIER WITH STANDBY MODE
June 2003
TS419-TS421
2/32
ABSOLUTE MAXIMUM RATINGS
OPERATING CONDITIONS
Symbol
Parameter
Value
Unit
V
CC
Supply voltage
1)
6
V
V
i
Input Voltage
-0.3V to V
CC
+
0.3V
V
T
stg
Storage Temperature
-65 to +150
C
T
j
Maximum Junction Temperature
150
C
R
thja
Thermal Resistance Junction to Ambient
SO8
MiniSO8
DFN8
175
215
70
C/W
Pd
Power Dissipation
2)
SO8
MiniSO8
DFN8
0.71
0.58
1.79
W
ESD
Human Body Model (pin to pin): TS419
3)
, TS421
1.5
kV
ESD
Machine Model - 220pF - 240pF (pin to pin)
100
V
Latch-up Latch-up Immunity (All pins)
200
mA
Lead Temperature (soldering, 10sec)
250
C
Output Short-Circuit to Vcc or GND
continous
4)
1. All voltage values are measured with respect to the ground pin.
2. Pd has been calculated with Tamb = 25C, Tjunction = 150C.
3. TS419 stands 1.5KV on all pins except standby pin which stands 1KV.
4. Attention must be paid to continous power dissipation (V
DD
x 300mA). Exposure of the IC to a short circuit for an extended time period is
dramatically reducing product life expectancy.
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
2 to 5.5
V
R
L
Load Resistor
16
T
oper
Operating Free Air Temperature Range
-40 to + 85
C
C
L
Load Capacitor
R
L
= 16 to 100
R
L
> 100
400
100
pF
V
ICM
Common Mode Input Voltage Range
GND to V
CC
-1V
V
V
STB
Standby Voltage Input
TS421 ACTIVE / TS419 in STANDBY
TS421 in STANDBY / TS419 ACTIVE
1.5
V
STB
V
CC
GND
V
STB
0.4
1)
V
R
THJA
Thermal Resistance Junction to Ambient
SO8
MiniSO8
DFN8
2)
150
190
41
C/W
T
wu
Wake-up time from standby to active mode (Cb = 1F)
3)
0.12
s
1.
The minimum current consumption (
I
STANDBY) is guaranteed at V
CC
(TS419) or GND (TS421) for the whole temperature range.
2. When mounted on a 4-layer PCB
3. For more details on T
WU
, please refer to application note section on Wake-up time page 28.
TS419-TS421
3/32
FIXED GAIN VERSION SPECIFIC ELECTRICAL CHARACTERISTICS
V
CC
from +5V to +2V, GND = 0V, T
amb
= 25C (unless otherwise specified)
APPLICATION COMPONENTS INFORMATION
TYPICAL APPLICATION SCHEMATICS:
Symbol
Parameter
Min.
Typ.
Max.
Unit
R
IN
Input Resistance
20
k
G
Gain value for Gain TS419/TS421-2
Gain value for Gain TS419/TS421-4
Gain value for Gain TS419/TS421-8
6dB
12dB
18dB
dB
Components
Functional Description
R
IN
Inverting input resistor which sets the closed loop gain in conjunction with R
FEED
. This resistor also
forms a high pass filter with C
IN
(fcl = 1 / (2 x Pi x R
IN
x C
IN
)). Not needed in fixed gain versions.
C
IN
Input coupling capacitor which blocks the DC voltage at the amplifier's input terminal
R
FEED
Feedback resistor which sets the closed loop gain in conjunction with R
IN
.
A
V
= Closed Loop Gain= 2xR
FEED
/R
IN
. Not needed in fixed gain versions.
C
S
Supply Bypass capacitor which provides power supply filtering.
C
B
Bypass capacitor which provides half supply filtering.
TS419-TS421
4/32
ELECTRICAL CHARACTERISTICS
V
CC
= +5V, GND = 0V, T
amb
= 25C (unless otherwise specified)
Symbol
Parameter
Min.
Typ.
Max.
Unit
I
CC
Supply Current
No input signal, no load
1.8
2.5
mA
I
STANDBY
Standby Current
No input signal, V
STANDBY
=GND for TS421
No input signal, V
STANDBY
=Vcc for TS419
10
1000
nA
Voo
Output Offset Voltage
No input signal, RL = 16 or 32
,
Rfeed=20k
5
25
mV
P
O
Output Power
THD+N = 0.1% Max, F = 1kHz, R
L
= 32
THD+N = 1% Max, F = 1kHz, R
L
= 32
THD+N = 10% Max, F = 1kHz, R
L
= 32
THD+N = 0.1% Max, F = 1kHz, R
L
= 16
THD+N = 1% Max, F = 1kHz, R
L
= 16
THD+N = 10% Max, F = 1kHz, R
L
= 16
166
240
190
207
258
270
295
367
mW
THD + N
Total Harmonic Distortion + Noise (A
v
=2)
R
L
= 32
,
P
out
= 150mW, 20Hz
F
20kHz
R
L
= 16
,
P
out
= 220mW, 20Hz
F
20kHz
0.15
0.2
%
PSRR
Power Supply Rejection Ratio (A
v
=2)
1)
F = 1kHz
,
Vripple = 200mVpp, input grounded, Cb=1F
1. Guaranteed by design and evaluation.
50
56
dB
SNR
Signal-to-Noise Ratio (Filter Type A, A
v
=2)
1)
(R
L
= 32
,
THD +N < 0.5%, 20Hz
F
20kHz)
85
98
dB
M
Phase Margin at Unity Gain
R
L
= 16
, C
L
= 400pF
58
Degrees
GM
Gain Margin
R
L
= 16
, C
L
= 400pF
18
dB
GBP
Gain Bandwidth Product
R
L
= 16
1.1
MHz
SR
Slew Rate
R
L
= 16
0.4
V/
S
TS419-TS421
5/32
ELECTRICAL CHARACTERISTICS
V
CC
= +3.3V, GND = 0V, T
amb
= 25C (unless otherwise specified)
1)
1.
All electrical values are guaranted with correlation measurements at 2V and 5V
Symbol
Parameter
Min.
Typ.
Max.
Unit
I
CC
Supply Current
No input signal, no load
1.8
2.5
mA
I
STANDBY
Standby Current
No input signal, V
STANDBY
=GND for TS421
No input signal, V
STANDBY
=Vcc for TS419
10
1000
nA
Voo
Output Offset Voltage
No input signal, RL = 16 or 32
,
Rfeed=20k
5
25
mV
P
O
Output Power
THD+N = 0.1% Max, F = 1kHz, R
L
= 32
THD+N = 1% Max, F = 1kHz, R
L
= 32
THD+N = 10% Max, F = 1kHz, R
L
= 32
THD+N = 0.1% Max, F = 1kHz, R
L
= 16
THD+N = 1% Max, F = 1kHz, R
L
= 16
THD+N = 10% Max, F = 1kHz, R
L
= 16
65
91
75
81
102
104
113
143
mW
THD + N
Total Harmonic Distortion + Noise (A
v
=2)
R
L
= 32
,
P
out
= 50mW, 20Hz
F
20kHz
R
L
= 16
,
P
out
= 70mW, 20Hz
F
20kHz
0.15
0.2
%
PSRR
Power Supply Rejection Ratio
inputs grounded, F = 1kHz
,
Vripple = 200mVpp, Cb=1F
50
56
dB
SNR
Signal-to-Noise Ratio (Weighted A, A
v
=2)
(R
L
= 32
,
THD +N < 0.5%, 20Hz
F
20kHz)
82
94
dB
M
Phase Margin at Unity Gain
R
L
= 16
, C
L
= 400pF
58
Degrees
GM
Gain Margin
R
L
= 16
, C
L
= 400pF
18
dB
GBP
Gain Bandwidth Product
R
L
= 16
1.1
MHz
SR
Slew Rate
R
L
= 16
0.4
V/
S
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