HT8692
Class D Audio Amplifier with Boost Converter
8.0W Anti-Clipping Mono Class
D Audio Amplifier with
Boost Converter
FEATURE
・Anti-Clipping
Function (ACF)
・Filter-less
Modulation, Eliminating Output Filter
・Output
Power
6.5W (V
BAT
=4.2V, PVDD = 7.0V, R
L
=4Ω,
THD+N=10%)
8.0W (V
BAT
=4.2V, PVDD = 7.0V, R
L
=3Ω,
THD+N=10%)
3.5W (V
BAT
=4.2V, PVDD = 7.0V, R
L
=8Ω,
THD+N=10%)
・Power
Supply
-Boost Input V
BAT
：2.5V
to 5.5V
-Boost Output PVDD：V
BAT
to 7.5V
・Adjustable
BOOST Output Voltage
・Class
AB / Class D
・Over
Current Protection, Thermal Protection,
Low voltage malfunction prevention function
included
・Pb-Free
Packages , SOP16L-PP/SOP16L
HT8692 integrates a boost converter with a
filter-less stereo class D audio power amplifier to
provide 6.5W continuous power into a 4Ω speaker,
and 8.0W continuous power into a 3Ω speaker
when operating from a Li-battery voltage boosted
to 7.0V. Meanwhile, the boost output voltage is
adjustable.
HT8692 features Anti-Clipping Function (ACF)
which detects output signal clip due to the over
input signal and suppresses the output signal clip
automatically. Also, the ACF function can adapt the
output clip caused by power supply voltage down
with battery. It can significantly improve the sound
quality, creating a very comfortable musical
enjoyment, and to protect the speakers from
overload damage. It also supplies ACF OFF mode.
Class AB amplifier mode is also available for
HT8692. Once the EMI Interference from class D
and Boost Converter becomes an annoying
problem, HT8692 can be changed into Class AB
mode.
HT8692 has a filter-less modulation circuit
which directly drives speakers while realizes low
distortion and low noise characteristics. Thanks to
filter-less, circuit design with fewer external parts
can be made in portable applications.
HT8692 has the independent Shutdown
function which can minimize the power
consumption at standby and MUTE function. As for
protection function, over current protection function
for speaker output terminals, over temperature
protection function, and low supply voltage
malfunction preventing function are also prepared.
GENERAL DESCRIPTION
APPLICATIONS
・Bluetooth
Speakers
・2.1
Channel Speakers
・iphone/ipod/ipod
docking
・Tablet
PC/Note Book
・LCD
TV/Monitor
・Portable
Speakers
・
Megaphone
・MP4/GPS
・Smart
Phones
・Portable
Gamers
TYPICAL APPLICATION
10 µF
470 µ F
Lx
1Ω
10nF Dx
10 µF
470 µ F
1µF
CTRL
1 µF
2
3
V
BAT
MUCH
16
15
1
11
7,8
5,6
9
Rd1
LX
ABD
PVDD
AGND
4
HT8692
FB
PGND
DGND
3.3nF
Rd2
C
IN
1KO
R
IN
13
14
IN+
OUT+
OUT-
12
10
0.1uF
56KΩ
R
IN
C
IN
0.1uF
56KΩ
IN-
Copyright ©2016, Jiaxing Heroic Technology Co., Ltd
-1-
11/2016 – V1.4
HT8692
Class D Audio Amplifier with Boost Converter
TERMINAL CONFIGURATION
AGND
1
2
3
4
16
CTRL
15
14
IN-
ABD
VBAT
MUCH
13
IN+
FB
LX
5
6
7
12
11
OUT+
LX
PGND
10
OUT-
DGND
DGND
8
9
PVDD
SOP16L-PP/SOP16L Top View
TERMINAL FUNCTION
*1
SOP
Terminal
No.
1
2
3
4
5,6
7,8
9
10
11
12
13
14
15
16
*1
I: Input
O:Output
Name
AGND
V
BAT
MUCH
FB
LX
DGND
PVDD
OUT-
PGND
OUT+
IN+
IN-
ABD
CTRL
I/O
GND
Power
I
I
I
GND
Power
O
GND
O
I
I
I
I
ESD
Protection
PN
PN
PN
PN
-
-
-
-
Function
Analog Ground
Power Supply
Mute Control Terminal
Regulator Feedback Input
Internal Switch Input
Power Ground for Boost converter
Boost Converter Output Voltage
Negative Output Terminal (BTL-)
Power Ground for Class D
Positive Output (BTL+)
Positive Input Terminal (differential +)
Negative Input Terminal (differential -)
Class D or Class AB Amplifier Mode
Control Terminal
Shutdown and ACF Control Terminal
PN
PN
PN
PN
Copyright ©2016, Jiaxing Heroic Technology Co., Ltd
-2-
11/2016 – V1.4
HT8692
Class D Audio Amplifier with Boost Converter
ORDERING INFORMATION
H
T
8
6
9
2
XX
Package type
Part Number
HT8692SP
HT8692SP
Package Type
SOP16L-PP
SOP16L
Marking
HT8692
SP
K#####
*2
HT8692
SP
B#####
*2
Operating
Temperature Range
-40℃½85℃
-40℃½85℃
MOQ/Shipping
Package
Tape
50PCS
Tape
50PCS
*2：##### is production track code.
ELECTRICAL CHARACTERISTIC
Item
Power supply voltage range
BOOST converter output voltage range
Input terminal voltage range (IN+, IN-)
Input terminal voltage range (except IN+, IN-)
Operating Ambient Temperature
Junction Temperature
Symbol
V
BAT
PVDD
V
IN
V
IN
T
A
T
J
Min.
-0.3
V
BAT
V
SS
－0.6
V
SS
－0.3
-40
-40
Max.
6.0
7.8
PVDD＋0.6
PVDD＋0.3
85
150
Unit
V
V
V
V
℃
℃
Absolute Maximum Ratings
*3
Storage Temperature
T
STG
-50
150
℃
*3:
Absolute Maximum Ratings is values which must not be exceeded to guarantee device reliability. With a system in
which supply voltage might exceed supply voltage of PVDD/GND, external diodes are recommended to be used to
assure that the voltage does not exceed the absolute maximum rating.
Recommended Operating Condition
Item
Power Supply
Voltage
*4
BOOST converter output voltage range
Operating Ambient Temperature
Symbol
V
BAT
PVDD
T
a
SOP16L-PP
SOP16L
Conditions
Min.
2.5
V
BAT
-40
2
4
Typ.
3.6
7.0
25
Max.
5.5
7.5
85
Unit
V
V
℃
Ω
Ω
Speaker Impedance
R
L
Speaker Impedance
R
L
*4:
The rising time of
V
BAT
should be more than 1µs.
Copyright ©2016, Jiaxing Heroic Technology Co., Ltd
-3-
11/2016 – V1.4
HT8692
Class D Audio Amplifier with Boost Converter
Electrical Specification
*5
Item
Symbol
Conditions
Min.
Typ.
Max.
Unit
BOOST Converter
Boost converter output
7.0
7.5
V
PVDD
V
BAT
voltage
Boost converter
f
SW
410
kHz
frequency
Boost converter input
I
LIMTRIP
3.2
A
current limit
Class D Channel
V
SS
=0V, V
BAT
=3.6V, R
IN
= 56K, Ta=25ºC, C
IN
=0.1uF, ACF-Off mode, unless otherwise specified
Carrier clock frequency
Over current protection
System Gain
Start-up time (power-on
or shutdown release)
ACF attenuation gain
Consumption current in
shutdown mode
PVDD = 6.5V
f
PWM
Imax
Av
0
t
STUP
Aa
I
SD
CTRL=V
SS
R
L
=4Ω
R
L
=3Ω
*9
Output Power
P
O
R
L
=8Ω
R
L
=4Ω
R
L
=3Ω
*9
R
L
=8Ω
Total Harmonic
Distortion plus Noise
Output Noise
Signal to Noise Ratio
Output offset voltage
Efficiency (Class D +
Boost)
Quiescent current
Quiescent current in
mute mode
Maximum Input Signal
PVDD = 7.0V
R
L
=4Ω
R
L
=3Ω
*9
Output Power
P
O
R
L
=8Ω
R
L
=4Ω
R
L
=3Ω
*9
R
L
=8Ω
Total Harmonic
Distortion plus Noise
Output Noise
P
O
=0.1W
THD+N
V
N
P
O
=1.0W
V
BAT
=4.2V,
f=1kHz,
THD+N=10%
V
BAT
=4.2V,
f=1kHz,
THD+N=1%
R
L
=4Ω,
f=1kHz
6.6
8.2
3.5
5.3
6.6
2.9
0.23
0.12
0.15
150
%
%
%
µV
rms
11/2016 – V1.4
W
P
O
=0.1W
THD+N
V
N
SNR
V
OS
P
O
=1.0W
-16
25
5.6
7.0
3.1
4.5
5.6
2.5
0.23
0.12
0.15
150
90
±2
V
BAT
=3.6V, R
L
=4Ω+22uH,
THD+N = 10%
V
BAT
=3.6V, R
L
=8Ω+33uH,
THD+N = 10%
No Load
Input
*6
Grounded
With Load
Input
Grounded,
With Load
*6
MUCH = H
f
IN
= 1kHz, THD+N≤10%,
ACF-1 ON
No Load
70
75
20
20
8
8
1.2
%
%
%
µV
rms
dB
mV
%
%
mA
mA
mA
mA
Vrms
W
R
IN
=56 kΩ
26
280
0
410
5
kHz
A
dB
ms
dB
µA
V
BAT
=4.2V,
f=1kHz,
THD+N=10%
V
BAT
=4.2V,
f=1kHz,
THD+N=1%
R
L
=4Ω,
f=1kHz
P
O
=3.0W
f=20Hz~20kHz, A weighted,
Av=26dB
A weighted, Av=26dB, THD+N
= 1%
η
I
BAT
I
MUTE
V
IN
max
P
O
=3.0W
f=20Hz~20kHz, A weighted,
Av=26dB
-4-
Copyright ©2016, Jiaxing Heroic Technology Co., Ltd
HT8692
Class D Audio Amplifier with Boost Converter
Signal to Noise Ratio
Output offset voltage
Efficiency (Class D +
Boost)
Quiescent current
Consumption current in
mute mode
SNR
V
OS
A weighted, Av=26dB, THD+N
= 1%
V
BAT
=3.6V, R
L
=4Ω+22uH,
THD+N = 10%
V
BAT
=3.6V, R
L
=8Ω+33uH,
THD+N = 10%
No Load
Input
*6
Grounded
With Load
No Load
90
±2
70
75
30
30
dB
mV
%
%
mA
mA
mA
mA
Vrms
η
I
BAT
I
MUTE
Input
10
Grounded,
With Load
*6
10
MUCH = H
f
IN
= 1kHz, THD+N≤10%,
Maximum Input Signal
V
IN
max
1.35
ACF-1 ON
Class AB Channel
*7
V
SS
=0V, V
BAT
=3.6V, Av=20dB, Ta=25ºC, C
IN
=0.1uF, unless otherwise specified
R
L
=4Ω,
1.3
V
BAT
=3.6V
f=1kHz,
R
L
=4Ω,
1.8
V
BAT
=4.2V
THD+N=10%
R
L
=4Ω,
2.65
V
BAT
=5.0V
Output Power
P
O
R
L
=4Ω,
1.0
V
BAT
=3.6V
R
L
=4Ω,
f=1kHz,
1.5
V
BAT
=4.2V
THD+N=1%
R
L
=4Ω,
2.1
V
BAT
=5.0V
P
O
=0.01W
0.12
Total
Harmonic
R
L
=4Ω,
THD+N
Distortion plus Noise
f=1kHz
P
O
=0.1W
0.1
Output Noise
Signal to Noise Ratio
Output offset voltage
Efficiency
Quiescent current
Consumption current in
mute mode
Consumption current in
shutdown mode
System Gain
Start-up time
(power-on, shutdown
release, or switch from
Class D to Class AB)
Digital Input/Output
ACF-Off mode setting
threshold voltage
ACF-1 mode setting
threshold voltage
ACF-2 mode setting
threshold voltage
*8
SD mode setting
threshold voltage
SD wake up voltage
Internal pull-down
Resistor of CTRL
ABD, MUCH Input High
V
N
SNR
V
OS
f=20Hz~20kHz, A weighted,
Av=20dB
A weighted, Av=20dB, THD+N
= 1%
R
L
=4Ω+22uH, THD+N = 10%
R
L
=8Ω+33uH, THD+N = 10%
No Load
With Load
No Load
With Load
Input
Grounded
Input
Grounded,
MUCH = H
75
90
±4
70
74.5
20
20
2.0
2.0
36
20
270
W
W
W
W
%
%
µV
rms
dB
mV
%
%
mA
mA
mA
mA
µA
dB
ms
η
I
BAT
I
MUTE
I
SD
Av
0
t
STUP
CTRL=V
SS
R
IN
=56 kΩ
V
MOD1
V
MOD2
V
MOD3
V
MOD4
V
CTRL_ON
R
CTRL
V
IH
-5-
0.75×
PVDD
0.45×
PVDD
0.10×
PVDD
V
SS
0.8
PVDD
0.70×
PVDD
0.40×
PVDD
0.06×
PVDD
V
V
V
V
Class D
Class AB
1.5
125
+∞
KΩ
V
11/2016 – V1.4
Copyright ©2016, Jiaxing Heroic Technology Co., Ltd
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