TS419, TS421
Datasheet
360 mW mono amplifier with standby mode
TS419IST : MiniSO8
Standby
Bypass
V
IN
+
V
IN-
1
2
3
4
8
7
6
5
V
OUT
2
GND
V
CC
V
OUT1
Features
•
•
•
•
•
•
•
•
•
Operating from V
CC
= 2 V to 5.5 V
Standby mode active high (TS419) or low (TS421)
Output power into 16 Ω: 367 mW @ 5 V with 10% THD+N max or 295 mW @ 5
V and 110 mW @ 3.3 V with 1% THD+N max.
Low current consumption: 2.5 mA max.
High signal-to-noise ratio: 95 dB (A) at 5 V
PSRR: 56 dB typ. at 1 kHz, 46 dB at 217 Hz
Short-circuit limitation
ON/OFF click reduction circuitry
Available in MiniSO8 and DFN 3x3
TS421IQT : DFN8
GND
V
OUT
2
Standby
Bypass
1
2
3
4
8
7
6
5
V
CC
V
OUT1
V
IN
+
V
IN-
Applications
•
•
•
•
16/32 Ω earpiece or receiver speaker driver
Mobile and cordless phones (analog / digital)
PDAs & computers
Portable appliances
Description
Maturity status link
TS3431
The TS419/TS421 is a monaural audio power amplifier driving in BTL mode a 16 or
32 Ω earpiece or receiver speaker. The main advantage of this configuration is to get
rid of bulky output capacitors.
Capable of descending to low voltages, it delivers up to 220 mW per channel (into 16
Ω loads) of continuous average power with 0.2% THD+N in the audio bandwidth from
a 5 V power supply.
An externally controlled standby mode reduces the supply current to 10 nA (typ.).
The TS419 / TS421 can be configured by external gain-setting resistors.
DS3048
-
Rev 5
-
May 2019
For further information contact your local STMicroelectronics sales office.
www.st.com
TS419, TS421
Maximum ratings
1
Maximum ratings
Table 1.
Absolute maximum ratings
Symbol
V
CC
V
i
T
stg
T
j
Supply voltage
(1)
Input voltage
Storage temperature
Maximum junction temperature
Thermal resistance junction-to-ambient
R
thja
MiniSO8
DFN8
Power dissipation
(2)
P
d
MiniSO8
DFN8
ESD
ESD
Latch-up
Human body model (pin to pin): TS419
(3)
, TS421
Machine Model - 220 pF - 240 pF (pin to pin)
Latch-up Immunity (All pins)
Lead temperature (soldering, 10 s)
Output short-circuit to V
CC
or GND
1. All voltage values are measured with respect to the ground pin.
2. Pd has been calculated with Tamb = 25 °C, Tj = 150 °C.
3. TS419 stands 1.5 KV on all pins except standby pin which stands 1 KV
4. Attention must be paid to continous power dissipation (V
DD
x 300 mA). Exposure of the IC to a short circuit for an extended
time period is dramatically reducing product life expectancy.
215
70
0.58
1.79
1.5
100
200
250
continuous
(4)
°C/W
Parameter
Value
6
-0.3 V to V
CC
+0.3 V
-65 to +150
150
Unit
V
V
°C
°C
W
kV
V
mA
°C
Table 2.
Operating conditions
Symbol
V
CC
R
L
T
oper
Supply voltage
Load resistor
Operating free air temperature range
Load capacitor
C
L
R
L
= 16 to 100 Ω
R
L
> 100 Ω
V
ICM
Common mode input voltage range
Standby voltage input
V
STB
TS421 ACTIVE / TS419 in STANDBY
TS421 in STANDBY / TS419 ACTIVE
Thermal resistance junction-to-ambient
R
thja
MiniSO8
DFN8
(2)
Parameter
Value
2 to 5.5
≥ 16
-40 to +85
400
100
GND to V
CC
- 1 V
1.5 ≤ V
STB
≤ V
CC
GND ≤ V
STB
≤ 0.4
(1)
Unit
V
Ω
°C
pF
V
V
190
41
°C/W
DS3048
-
Rev 5
page 2/47
TS419, TS421
Maximum ratings
Symbol
T
wu
Parameter
Wake-up time from standby to active mode (Cb = 1 μF)
(3)
Value
≥ 0.12
Unit
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.
DS3048
-
Rev 5
page 3/47
TS419, TS421
Typical application schematics
2
Typical application schematics
Figure 1.
Application schematics
Table 3.
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
(f
cl
= 1 / (2 x P
i
x R
IN
x C
IN
)).
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= 2 x R
FEED
/ R
IN
.
Supply bypass capacitor which provides power supply filtering.
Bypass capacitor which provides half supply filtering.
DS3048
-
Rev 5
page 4/47
TS419, TS421
Electrical characteristics
3
Electrical characteristics
Table 4.
Electrical characteristics V
CC
= +5 V, GND = 0 V, T
amb
= 25 °C (unless otherwise specified)
Symbol
I
CC
Supply current
No input signal, no load
Standby current
I
STANDBY
No input signal, V
STANDBY
= GND for TS421
No input signal, V
STANDBY
= V
CC
for TS419
V
OO
Output offset voltage
No input signal, R
L
= 16 Ω or 32 Ω, R
feed
= 20 kΩ
Output power
THD+N = 0.1% Max, F = 1 kHz, R
L
= 32 Ω
Output power
THD+N = 1% Max, F = 1 kHz, R
L
= 32 Ω
Output power
P
O
THD+N = 10% Max, F = 1 kHz, R
L
= 32 Ω
Output power
THD+N = 0.1% Max, F = 1 kHz, R
L
= 16 Ω
Output power
THD+N = 1% Max, F = 1 kHz, R
L
= 16 Ω
Output power
THD+N = 10% Max, F = 1 kHz, R
L
= 16 Ω
Total harmonic distortion + noise (Av = 2)
THD + N
R
L
= 32 Ω, P
out
= 150 mW, 20 Hz ≤ F ≤ 20 kHz
R
L
= 16 Ω, P
out
= 220 mW, 20 Hz ≤ F ≤ 20 kHz
PSRR
Power supply rejection ratio (Av = 2)
F = 1 kHz, V
ripple
= 200 mVpp, input grounded, C
b
= 1 μF
Signal-to-Noise Ratio (Filter Type A, Av = 2)
(1)
(R
L
= 32 Ω, THD +N < 0.5%, 20 Hz ≤ F ≤ 20 kHz)
Phase margin at unity gain
R
L
= 16 Ω, C
L
= 400 pF
Gain margin
R
L
= 16 Ω, C
L
= 400 pF
Gain bandwidth product
R
L
= 16 Ω
Slew rate
R
L
= 16 Ω
50
240
166
5
25
mV
10
1000
nA
Parameter
Min.
Typ.
6
Max.
8
Unit
mA
190
207
258
mW
270
295
367
0.15
0.2
%
56
dB
SNR
85
98
dB
ϕ
M
58
Degrees
GM
18
dB
GBP
1.1
MHz
SR
0.4
V/µS
1. Guaranteed by design and evaluation.
DS3048
-
Rev 5
page 5/47
