TS4621ML
High-performance class-G stereo headphone amplifier
Datasheet
−
production data
Features
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TS4621MLEIJT - flip-chip
Power supply range: 2.3 V to 4.8 V
0.6 mA/channel quiescent current
2.1 mA current consumption with
100 µW/channel (10 dB crest factor)
0.006% typical THD+N at 1 kHz
100 dB typical PSRR at 217 Hz
100 dB of SNR A-weighted at G = 0 dB
Zero "pop and click"
Gain settings : 0 dB and 6 dB
Integrated high efficiency step-down converter
Low standby current: 5 µA max
INR+
CMS
PVSS
C2
INR-
Pinout (top view)
TOP VIEW
GAIN
EN
VOUTR
D
C
Output-coupling capacitors removed
Thermal shutdown
Flip-chip package: 1.65 mm x 1.65 mm,
400 µm pitch, 16 bumps
INL+
HPVDD
C1
AGND
B
INL-
VOUTL
AVDD
SW
A
4
3
2
1
Applications
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Balls are underneath
amplitude of the audio signal to supply the
headsets. It achieves a total 2.1 mA current
consumption at 100 µW output power (10 dB
crest factor).
THD+N is 0.02 % maximum at 1 kHz and PSRR
is 100 dB at 217 Hz, which ensures a high audio
quality of the device in a wide range of
environments.
The traditionally bulky output coupling capacitors
can be removed.
A dedicated common-mode sense pin removes
parasitic ground noise.
The TS4621ML is designed to be used with an
output serial resistor. It ensures unconditional
stability over a wide range of capacitive loads.
The TS4621ML is packaged in a tiny 16-bump
flip-chip package with a pitch of 400 µm.
Cellular phones, smartphones
Mobile internet devices
PMP/MP3 players
Portable CD/DVD players
Description
The TS4621ML is a class-G stereo headphone
driver dedicated to high-performance audio, high-
power efficiency and space-constrained
applications.
It is based on the core technology of a low power
dissipation amplifier combined with a high-
efficiency step-down DC/DC converter for
supplying this amplifier.
When powered by a battery, the internal step-
down DC/DC converter generates the appropriate
voltage to the amplifier depending on the
May 2012
This is information on a product in full production.
Doc ID 023181 Rev 1
1/40
www.st.com
40
Contents
TS4621ML
Contents
1
2
3
4
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 5
Typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.1
4.2
4.3
Gain control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Overview of the class-G, 2-level headphone amplifier . . . . . . . . . . . . . . . 25
External component selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.3.1
4.3.2
4.3.3
4.3.4
4.3.5
4.3.6
4.3.7
Step-down inductor selection (L1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Step-down output capacitor selection (C
t
) . . . . . . . . . . . . . . . . . . . . . . . 27
Full capacitive inverter capacitors selection (C12 and C
SS
) . . . . . . . . . 28
Power supply decoupling capacitor selection (Cs) . . . . . . . . . . . . . . . . . 28
Input coupling capacitor selection (C
in
) . . . . . . . . . . . . . . . . . . . . . . . . . 28
Low-pass output filter (R
out
and C
out
) and
IEC 61000-4-2 ESD protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Integrated input low-pass filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.4
4.5
Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.4.1
Layout recommendations for single-ended operation . . . . . . . . . . . . . . 32
Startup phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.5.1
4.5.2
Auto zero technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Input impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.6
Layout recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.6.1
Common-mode sense layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5
6
7
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
2/40
Doc ID 023181 Rev 1
TS4621ML
List of figures
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Figure 22.
Figure 23.
Figure 24.
Figure 25.
Figure 26.
Figure 27.
Figure 28.
Figure 29.
Figure 30.
Figure 31.
Figure 32.
Figure 33.
Figure 34.
Figure 35.
Figure 36.
Figure 37.
Figure 38.
Figure 39.
Figure 40.
Figure 41.
Figure 42.
Figure 43.
Figure 44.
Figure 45.
Figure 46.
Figure 47.
Figure 48.
Typical application schematic for the TS4621ML . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Current consumption vs. power supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Standby current consumption vs. power supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Maximum output power vs. power supply voltage, R
L
= 16
Ω . . . . . . . . . . . . . . . . . . . . . . . . .11
Maximum output power vs. power supply voltage, R
L
= 32
Ω . . . . . . . . . . . . . . . . . . . . . . . . .11
Maximum output power vs. power supply voltage, R
L
= 47
Ω . . . . . . . . . . . . . . . . . . . . . . . . .11
Current consumption vs. total output power, R
L
= 16
Ω. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Current consumption vs. total output power, R
L
= 32
Ω. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Current consumption vs. total output power, R
L
= 47
Ω. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Differential input impedance vs. gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
THD+N vs. output power - R
L
= 16
Ω,
in-phase, V
CC
= 2.5 V . . . . . . . . . . . . . . . . . . . . . . 12
THD+N vs. output power - R
L
= 16
Ω,
out-of-phase, V
CC
= 2.5 V . . . . . . . . . . . . . . . . . . . 12
THD+N vs. output power - R
L
= 16
Ω,
in-phase, V
CC
= 3.6 V . . . . . . . . . . . . . . . . . . . . . . 12
THD+N vs. output power - R
L
= 16
Ω,
out-of-phase, V
CC
= 3.6 V . . . . . . . . . . . . . . . . . . . 13
THD+N vs. output power - R
L
= 16
Ω,
in-phase, V
CC
= 4.8 V . . . . . . . . . . . . . . . . . . . . . . 13
THD+N vs. output power - R
L
= 16
Ω,
out-of-phase, V
CC
= 4.8 V . . . . . . . . . . . . . . . . . . . 13
THD+N vs. output power - R
L
= 32
Ω,
in-phase, V
CC
= 2.5 V . . . . . . . . . . . . . . . . . . . . . . 13
THD+N vs. output power - R
L
= 32
Ω,
out-of-phase, V
CC
= 2.5 V . . . . . . . . . . . . . . . . . . . 14
THD+N vs. output power - R
L
= 32
Ω,
in-phase, V
CC
= 3.6 V . . . . . . . . . . . . . . . . . . . . . . 14
THD+N vs. output power - R
L
= 32
Ω,
out-of-phase, V
CC
= 3.6 V . . . . . . . . . . . . . . . . . . . 14
THD+N vs. output power - R
L
= 32
Ω,
in-phase, V
CC
= 4.8 V . . . . . . . . . . . . . . . . . . . . . . 14
THD+N vs. output power - R
L
= 32
Ω,
out-of-phase, V
CC
= 4.8 V . . . . . . . . . . . . . . . . . . . 15
THD+N vs. output power - R
L
= 32
Ω+IPad,
in-phase, V
CC
= 2.5 V . . . . . . . . . . . . . . . . . . 15
THD+N vs. output power - R
L
= 32
Ω+IPad,
out-of-phase, V
CC
= 2.5 V. . . . . . . . . . . . . . . 15
THD+N vs. output power - R
L
= 32
Ω+IPad,
in-phase, V
CC
= 3.6 V . . . . . . . . . . . . . . . . . . 15
THD+N vs. output power - R
L
= 32
Ω+IPad,
out-of-phase, V
CC
= 3.6 V. . . . . . . . . . . . . . . 16
THD+N vs. output power - R
L
= 32
Ω+IPad,
in-phase, V
CC
= 4.8 V . . . . . . . . . . . . . . . . . . 16
THD+N vs. output power - R
L
= 32
Ω+IPad,
out-of-phase, V
CC
= 4.8 V. . . . . . . . . . . . . . . 16
THD+N vs. output power - R
L
= 47
Ω,
in-phase, V
CC
= 2.5 V . . . . . . . . . . . . . . . . . . . . . . 16
THD+N vs. output power - R
L
= 47
Ω,
out-of-phase, V
CC
= 2.5 V . . . . . . . . . . . . . . . . . . . 17
THD+N vs. output power - R
L
= 47
Ω,
in-phase, V
CC
= 3.6 V . . . . . . . . . . . . . . . . . . . . . . 17
THD+N vs. output power - R
L
= 47
Ω,
out-of-phase, V
CC
= 3.6 V . . . . . . . . . . . . . . . . . . . 17
THD+N vs. output power - R
L
= 47
Ω,
in-phase, V
CC
= 4.8 V . . . . . . . . . . . . . . . . . . . . . . 17
THD+N vs. output power -R
L
= 47
Ω,
out-of-phase, V
CC
= 4.8 V . . . . . . . . . . . . . . . . . . . . 17
THD+N vs. frequency, R
L
= 16
Ω,
in-phase, V
CC
= 2.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . 17
THD+N vs. frequency, R
L
= 16
Ω,
out-of-phase, V
CC
= 2.5 V . . . . . . . . . . . . . . . . . . . . . . 18
THD+N vs. frequency, R
L
= 16
Ω,
in-phase, V
CC
= 3.6 V. . . . . . . . . . . . . . . . . . . . . . . . . . 18
THD+N vs. frequency, R
L
= 16
Ω,
out-of-phase, V
CC
= 3.6 V . . . . . . . . . . . . . . . . . . . . . . 18
THD+N vs. frequency, R
L
= 16
Ω,
in-phase, V
CC
= 4.8 V. . . . . . . . . . . . . . . . . . . . . . . . . . 18
THD+N vs. frequency, R
L
= 16
Ω,
out-of-phase, V
CC
= 4.8 V . . . . . . . . . . . . . . . . . . . . . . 19
THD+N vs. frequency, R
L
= 32
Ω,
in-phase, V
CC
= 2.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . 19
THD+N vs. frequency, R
L
= 32
Ω,
out-of-phase, V
CC
= 2.5 V . . . . . . . . . . . . . . . . . . . . . . 19
THD+N vs. frequency, R
L
= 32
Ω,
in-phase, V
CC
= 3.6 V. . . . . . . . . . . . . . . . . . . . . . . . . . 19
THD+N vs. frequency, R
L
= 32
Ω,
out-of-phase, V
CC
= 3.6 V . . . . . . . . . . . . . . . . . . . . . . 20
THD+N vs. frequency, R
L
= 32
Ω,
in-phase, V
CC
= 4.8 V. . . . . . . . . . . . . . . . . . . . . . . . . . 20
THD+N vs. frequency, R
L
= 32
Ω,
out-of-phase, V
CC
= 4.8 V . . . . . . . . . . . . . . . . . . . . . . 20
THD+N vs. frequency, R
L
= 47
Ω,
in-phase, V
CC
= 2.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . 20
THD+N vs. frequency, R
L
= 47
Ω,
out-of-phase, V
CC
= 2.5 V . . . . . . . . . . . . . . . . . . . . . . 21
Doc ID 023181 Rev 1
3/40
List of figures
Figure 49.
Figure 50.
Figure 51.
Figure 52.
Figure 53.
Figure 54.
Figure 55.
Figure 56.
Figure 57.
Figure 58.
Figure 59.
Figure 60.
Figure 61.
Figure 62.
Figure 63.
Figure 64.
Figure 65.
Figure 66.
Figure 67.
Figure 68.
Figure 69.
Figure 70.
Figure 71.
Figure 72.
Figure 73.
Figure 74.
Figure 75.
Figure 76.
Figure 77.
TS4621ML
THD+N vs. frequency, R
L
= 47
Ω,
in-phase, V
CC
= 3.6 V. . . . . . . . . . . . . . . . . . . . . . . . . . 21
THD+N vs. frequency, R
L
= 47
Ω,
out-of-phase, V
CC
= 3.6 V . . . . . . . . . . . . . . . . . . . . . . 21
THD+N vs. frequency, R
L
= 47
Ω,
in-phase, V
CC
= 4.8 V. . . . . . . . . . . . . . . . . . . . . . . . . . 21
THD+N vs. frequency, R
L
= 47
Ω,
out-of-phase, V
CC
= 4.8 V . . . . . . . . . . . . . . . . . . . . . . 22
PSRR vs. frequency - V
CC
= 3.6 V, gain = 0 dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
PSRR vs. frequency - V
CC
= 3.6 V, gain = +6 dB. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Output signal spectrum (V
CC
= 3.6 V, load = 32
Ω)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Crosstalk vs. frequency - R
L
= 32
Ω,
V
CC
= 3.6 V, gain = 0 dB . . . . . . . . . . . . . . . . . . . . . 23
Crosstalk vs. frequency - R
L
= 32
Ω,
V
CC
= 3.6 V, gain = +6 dB . . . . . . . . . . . . . . . . . . . . 23
Crosstalk vs. frequency - R
L
= 47
Ω,
V
CC
= 3.6 V, gain = 0 dB . . . . . . . . . . . . . . . . . . . . . 23
Crosstalk vs. frequency - R
L
= 47
Ω,
V
CC
= 3.6 V, gain = +6 dB . . . . . . . . . . . . . . . . . . . . 23
CMRR vs. frequency, 32
Ω,
V
CC
= 36 V, 0 dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
CMRR vs. frequency, 32
Ω,
V
CC
= 36 V, 6 dB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Wake-up time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
TS4621ML architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Efficiency comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Class-G operating with a music sample . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Typical application schematic with IEC 61000-4-2 ESD protection . . . . . . . . . . . . . . . . . . 30
Single-ended input configuration1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Single-ended input configuration 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Incorrect ground connection for single-ended option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Correct ground connection for single-ended option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Common-mode sense layout example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
TS4621ML footprint recommendation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Marking (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Flip-chip - 16 bumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Device orientation in tape pocket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
4/40
Doc ID 023181 Rev 1
TS4621ML
Absolute maximum ratings and operating conditions
1
Absolute maximum ratings and operating conditions
Table 1.
Symbol
V
CC
V
in+
,V
in-
Control
input
voltage
T
stg
T
j
R
thja
P
d
Absolute maximum ratings
Parameter
Supply voltage
(1)
during 1 ms.
Input voltage referred to ground
EN, Gain
Storage temperature
Maximum junction temperature
(2)
Thermal resistance junction to ambient
(3)
Power dissipation
Human body model (HBM)
(5)
All pins
VOUTR, VOUTL vs. AGND
Machine model (MM), min. value
(6)
Value
5.5
+/- 1.2
-0.3 to VDD
-65 to +150
150
200
Internally limited
(4)
2
4
100
500
750
+/- 8
+/- 15
260
kV
V
V
Unit
V
V
V
°C
°C
°C/W
ESD
Charge device model (CDM)
All pins
VOUTR, VOUTL
IEC61000-4-2 level 4, contact
(7)
IEC61000-4-2 level 4, air discharge
(7)
Lead temperature (soldering, 10 sec)
kV
°C
1. All voltage values are measured with respect to the ground pin.
2. Thermal shutdown is activated when maximum junction temperature is reached.
3. The device is protected from overtemperature by a thermal shutdown mechanism, active at 150° C.
4. Exceeding the power derating curves for long periods may provoke abnormal operation.
5. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a
1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations
while the other pins are floating.
6. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between
two pins of the device with no external series resistor (internal resistor < 5
Ω).
This is done for all couples of
connected pin combinations while the other pins are floating.
7. The measurement is performed on an evaluation board, with ESD protection EMIF02-AV01F3.
Doc ID 023181 Rev 1
5/40
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