TS419
TS421
360mW MONO AMPLIFIER WITH STANDBY MODE
s
OPERATING FROM Vcc=2V to 5.5V
s
STANDBY MODE
ACTIVE HIGH (TS419) or
LOW (TS421)
s
OUTPUT POWER into 16Ω: 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 32Ω 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 16Ω 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
Part
Number
Temp.
Range:
I
TS419IQT, TS419-xIQT: DFN8
PIN CONNECTIONS
(top view)
TS419IDT: SO8
TS419IST, TS419-xIST: MiniSO8
Standby
Bypass
V
IN
+
V
IN-
1
2
3
4
8
7
6
5
V
OUT
2
GND
V
CC
V
OUT1
GND
V
OUT 2
STANDBY
BYPASS
1
2
3
4
8
7
6
5
Vcc
V
OUT 1
V
IN-
V
IN+
TS421IDT: SO8
TS421IST, TS421-xIST: MiniSO8
Package
Gain
D
•
•
•
tba
tba
tba
•
tba
tba
tba
•
tba
tba
tba
•
tba
tba
tba
S
Q
external
external
external
x2/6dB
x4/12dB
x8/18dB
external
x2/6dB
x4/12dB
x8/18dB
TS419I
TS421I
K19A
K19B
K19C
K19D
K21A
K21B
K21C
K21D
Marking
TS421IQT, TS421-xIQT: DFN8
TS419
TS421
TS419
TS419-2
TS419-4
-40, +85°C
TS419-8
TS421
TS421-2
TS421-4
TS421-8
GND
V
OUT 2
STANDBY
BYPASS
1
2
3
4
8
7
6
5
Vcc
V
OUT 1
V
IN-
V
IN+
MiniSO & DFN only available in Tape & Reel with T suffix.
SO is available in Tube (D) and in Tape & Reel (DT)
June 2003
1/32
TS419-TS421
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
i
T
stg
T
j
R
thja
Supply voltage
1)
Input Voltage
Storage Temperature
Maximum Junction Temperature
Thermal Resistance Junction to Ambient
SO8
MiniSO8
DFN8
Power Dissipation
2)
SO8
MiniSO8
DFN8
Parameter
Value
6
-0.3V to V
CC
+
0.3V
-65 to +150
150
175
215
70
0.71
0.58
1.79
1.5
100
200
250
continous
4)
Unit
V
V
°C
°C
°C/W
Pd
W
Human Body Model (pin to pin): TS419
3)
, TS421
ESD
Machine Model - 220pF - 240pF (pin to pin)
Latch-up Latch-up Immunity (All pins)
Lead Temperature (soldering, 10sec)
ESD
Output Short-Circuit to Vcc or GND
1. All voltage values are measured with respect to the ground pin.
2. Pd has been calculated with Tamb = 25°C, Tjunction = 150°C.
kV
V
mA
°C
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.
OPERATING CONDITIONS
Symbol
V
CC
R
L
T
oper
C
L
V
ICM
V
STB
Supply Voltage
Load Resistor
Operating Free Air Temperature Range
Load Capacitor
R
L
= 16 to 100Ω
R
L
> 100Ω
Common Mode Input Voltage Range
Standby Voltage Input
TS421 ACTIVE / TS419 in STANDBY
TS421 in STANDBY / TS419 ACTIVE
Thermal Resistance Junction to Ambient
SO8
MiniSO8
DFN8
2)
Parameter
Value
2 to 5.5
≥
16
-40 to + 85
400
100
GND to V
CC
-1V
1.5
≤
V
STB
≤
V
CC
GND
≤
V
STB
≤
0.4
150
190
41
1)
Unit
V
Ω
°C
pF
V
V
R
THJA
T
wu
°C/W
≥
0.12
Wake-up time from standby to active mode (Cb = 1µF)
3)
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.
s
2/32
TS419-TS421
FIXED GAIN VERSION SPECIFIC ELECTRICAL CHARACTERISTICS
V
CC
from
+5V to +2V,
GND =
0V,
T
amb
= 25°C (unless otherwise specified)
Symbol
R
IN
Input Resistance
Gain value for Gain TS419/TS421-2
G
Gain value for Gain TS419/TS421-4
Gain value for Gain TS419/TS421-8
Parameter
Min.
Typ.
20
6dB
12dB
18dB
dB
Max.
Unit
kΩ
APPLICATION COMPONENTS INFORMATION
Components
R
IN
C
IN
R
FEED
C
S
C
B
Functional Description
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.
Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminal
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.
Supply Bypass capacitor which provides power supply filtering.
Bypass capacitor which provides half supply filtering.
TYPICAL APPLICATION SCHEMATICS:
3/32
TS419-TS421
ELECTRICAL CHARACTERISTICS
V
CC
=
+5V,
GND =
0V,
T
amb
= 25°C (unless otherwise specified)
Symbol
I
CC
Parameter
Supply Current
No input signal, no load
Standby Current
No input signal,
No input signal,
V
STANDBY
=GND for TS421
V
STANDBY
=Vcc for TS419
Min.
Typ.
1.8
10
Max.
2.5
1000
Unit
mA
nA
I
STANDBY
Voo
Output Offset Voltage
No input signal, RL = 16 or 32Ω, Rfeed=20kΩ
Output Power
THD+N
THD+N
THD+N
THD+N
THD+N
THD+N
=
=
=
=
=
=
0.1% Max, F = 1kHz, R
L
= 32Ω
1% Max, F = 1kHz, R
L
= 32Ω
10% Max, F = 1kHz, R
L
= 32Ω
0.1% Max, F = 1kHz, R
L
= 16Ω
1% Max, F = 1kHz, R
L
= 16Ω
10% Max, F = 1kHz, R
L
= 16Ω
5
25
mV
166
P
O
240
190
207
258
270
295
367
mW
THD + N
Total Harmonic Distortion + Noise (A
v
=2)
R
L
= 32Ω, P
out
= 150mW, 20Hz
≤
F
≤
20kHz
R
L
= 16Ω, P
out
= 220mW, 20Hz
≤
F
≤
20kHz
Power Supply Rejection Ratio (A
v
=2)
1)
F = 1kHz, Vripple = 200mVpp, input grounded, Cb=1µF
Signal-to-Noise Ratio (Filter Type A, A
v
=2)
1)
(R
L
= 32Ω, THD +N < 0.5%, 20Hz
≤
F
≤
20kHz)
Phase Margin at Unity Gain
R
L
= 16Ω, C
L
= 400pF
Gain Margin
R
L
= 16Ω, C
L
= 400pF
Gain Bandwidth Product
R
L
= 16Ω
Slew Rate
R
L
= 16Ω
50
0.15
0.2
56
%
PSRR
dB
SNR
Φ
M
GM
GBP
SR
85
98
dB
58
18
1.1
0.4
Degrees
dB
MHz
V/µS
1. Guaranteed by design and evaluation.
4/32
TS419-TS421
ELECTRICAL CHARACTERISTICS
V
CC
=
+3.3V,
GND =
0V,
T
amb
= 25°C (unless otherwise specified)
1)
Symbol
I
CC
Parameter
Supply Current
No input signal, no load
Standby Current
No input signal,
No input signal,
V
STANDBY
=GND for TS421
V
STANDBY
=Vcc for TS419
Min.
Typ.
1.8
10
Max.
2.5
1000
Unit
mA
nA
I
STANDBY
Voo
Output Offset Voltage
No input signal, RL = 16 or 32Ω, Rfeed=20kΩ
Output Power
THD+N
THD+N
THD+N
THD+N
THD+N
THD+N
=
=
=
=
=
=
0.1% Max, F = 1kHz, R
L
= 32Ω
1% Max, F = 1kHz, R
L
= 32Ω
10% Max, F = 1kHz, R
L
= 32Ω
0.1% Max, F = 1kHz, R
L
= 16Ω
1% Max, F = 1kHz, R
L
= 16Ω
10% Max, F = 1kHz, R
L
= 16Ω
5
25
mV
65
P
O
91
75
81
102
104
113
143
mW
THD + N
Total Harmonic Distortion + Noise (A
v
=2)
R
L
= 32Ω, P
out
= 50mW, 20Hz
≤
F
≤
20kHz
R
L
= 16Ω, P
out
= 70mW, 20Hz
≤
F
≤
20kHz
Power Supply Rejection Ratio
inputs grounded, F = 1kHz, Vripple = 200mVpp, Cb=1µF
Signal-to-Noise Ratio (Weighted A, A
v
=2)
(R
L
= 32Ω, THD +N < 0.5%, 20Hz
≤
F
≤
20kHz)
Phase Margin at Unity Gain
R
L
= 16Ω, C
L
= 400pF
Gain Margin
R
L
= 16Ω, C
L
= 400pF
Gain Bandwidth Product
R
L
= 16Ω
Slew Rate
R
L
= 16Ω
50
82
0.15
0.2
56
94
58
18
1.1
0.4
%
PSRR
SNR
Φ
M
GM
GBP
SR
1.
dB
dB
Degrees
dB
MHz
V/µS
All electrical values are guaranted with correlation measurements at 2V and 5V
5/32
