19-3146; Rev 0; 1/04
Low-Cost, Mono, 1.4W BTL Audio Power
Amplifiers
General Description
The MAX9716/MAX9717 audio power amplifiers are ideal
for portable audio devices with internal speakers. A
bridge-tied load (BTL) architecture minimizes external
component count, while providing high-quality audio
reproduction. Both devices deliver 1.4W continuous
power into a 4Ω load with less than 1% Total Harmonic
Distortion (THD) while operating from a single +5V sup-
ply. With an 8Ω load, both devices deliver 1W continuous
power. These devices also deliver 350mW continuous
power into an 8Ω load while operating from a single
+3.0V supply. The devices are available as adjustable
gain amplifiers (MAX9716/MAX9717A) or with internally
fixed gains of 6dB, 9dB, and 12dB (MAX9717B/
MAX9717C/MAX9717D), reducing component count.
A low-power shutdown mode disables the bias generator
and amplifiers, reducing quiescent current consumption
to less than 10nA. These devices feature Maxim’s
industry-leading, comprehensive click-and-pop sup-
pression that reduces audible clicks and pops during
startup and shutdown.
The MAX9717 features a headphone sense input (BTL/SE)
that senses when a headphone is connected to the
device, disables the BTL slave driver, muting the speaker
while driving the headphone as a single-ended load.
The MAX9716 is pin compatible with the LM4890 and is
available in 9-bump UCSP™, 8-pin TDFN (3mm x
3mm), and 8-pin µMAX packages. The MAX9717 is
available in 9-bump UCSP, 8-pin TDFN, and 8-pin
µMAX packages. Both devices operate over the -40°C
to +85°C extended temperature range.
♦
1.4W into 4Ω at 1% THD+N
♦
10nA Low-Power Shutdown Mode
♦
73dB PSRR at 1kHz
♦
No Audible Clicks or Pops at Power-Up/Down
♦
Internal Fixed Gain to Reduce Component Count
(MAX9717B/C/D)
♦
Adjustable Gain Option (MAX9716/MAX9717A)
♦
BTL
/SE Input Senses when Headphones are
Connected (MAX9717)
♦
Pin Compatible with LM4890 (MAX9716)
♦
Pin Compatible with TPA711 (MAX9717A)
♦
Available in Compact, Thermally Enhanced
µMAX
and TDFN (3mm x 3mm) Packages
Features
♦
2.7V to 5.5V Single-Supply Operation
MAX9716/MAX9717
Ordering Information
PART
MAX9716ETA
MAX9716EBL-T*
MAX9716EUA
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
8 TDFN-EP**
3 x 3 UCSP
8 µMAX-EP**
GAIN
(dB)
Adj.
Adj.
Adj.
Applications
Mobile Phones
PDAs
Portable Devices
*Future
product—contact factory for availability.
**EP
= Exposed paddle.
Ordering Information continued at end of data sheet.
Pin Configurations and Selector Guide appear at end of data
sheet.
Simplified Block Diagrams
SINGLE SUPPLY
2.7V TO 5.5V
SINGLE SUPPLY
2.7V TO 5.5V
BIAS
BIAS
MAX9716
MAX9717B/C/D
IN-
IN-
BTL/SE
V
CC
UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Low-Cost, Mono, 1.4W BTL Audio Power
Amplifiers
MAX9716/MAX9717
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
to GND) ..................................-0.3V to +6V
Any Other Pin to GND ...............................-0.3V to (V
CC
+ 0.3V)
IN_, BIAS,
SHDN, BTL/SE
Continuous Current...................20mA
OUT_ Short-Circuit Duration to GND or V
CC
(Note 1)...Continuous
Continuous Power Dissipation (T
A
= +70°C)
8-Pin TDFN (derate 24.4mW/°C above +70°C) .........1951mW
8-Pin µMAX (derate 10.3mW/°C above +70°C) ...........825mW
9-Bump UCSP (derate 5.2mW/°C above 70°C) ...........412mW
Operating Temperature Range ..........................-40°C to +85°C
Maximum Junction Temperature ....................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Bump Temperature (soldering)........................................+235°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS—5V Supply
(V
CC
= 5V, GND = 0,
SHDN
= V
CC
, T
A
= +25°C. C
BIAS
= 1µF, R
IN
= R
F
= 20kΩ (MAX9716/MAX9717A), IN+ = BIAS (MAX9716),
BTL/SE
= GND (MAX9717_), R
L
=
∞
connected between OUT+ and OUT-. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
Supply Voltage
Quiescent Supply Current
Shutdown Supply Current
SHDN
Threshold
SYMBOL
V
CC
I
CC
I
SHDN
V
IH
V
IL
V
IH
BTL/SE
Threshold
V
IL
Common-Mode Bias Voltage
Output Offset Voltage
V
BIAS
V
OS
(Note 4)
V
IN-
= V
OUT+
, V
IN+
= V
BIAS
(Note 5)
V
CC
= 2.7V to 5.5V
Power-Supply Rejection Ratio
PSRR
V
IN+
= V
BIAS
,
V
RIPPLE
= 200mV
P-P
,
R
L
= 8Ω (Note 6)
DC, V
BIAS
= 1.5V
f = 217Hz
f = 1kHz
0.8
60
V
CC
/2
- 6%
V
CC
/2
±7
80
61
73
1.1
1.4
0.155
0.024
106
105
%
nV/√Hz
dB
W
dB
0.9 x
V
CC
0.7 x
V
CC
V
CC
/2
+ 6%
±15
V
mV
CONDITIONS
Inferred by PSRR test
V
IN-
= V
IN+
= V
BIAS
(Note 3),
T
A
= -40°C to +85°C
SHDN
= GND
1.2
0.4
MIN
2.7
4.3
0.01
TYP
MAX
5.5
8
1
UNITS
V
mA
µA
V
V
R
L
= 8Ω, THD+N = 1%, f
IN
= 1kHz (Note 7)
Output Power
P
OUT
R
L
= 4Ω, THD+N = 1%, f
IN
= 1kHz (Note 7)
R
L
= 16Ω,
BTL/SE
= V
CC
(single-ended
mode), THD+N = 1%, f
IN
= 1kHz
A
V
= 6dB, R
L
= 8Ω, f
IN
= 1kHz,
P
OUT
= 0.5W (Note 8)
f
IN
= 10kHz
THD+N = 1%
Total Harmonic Distortion Plus
Noise
Output Noise Density
Signal-to-Noise Ratio
THD+N
e
n
SNR
2
_______________________________________________________________________________________
Low-Cost, Mono, 1.4W BTL Audio Power
Amplifiers
ELECTRICAL CHARACTERISTICS—5V Supply (continued)
(V
CC
= 5V, GND = 0,
SHDN
= V
CC
, T
A
= +25°C. C
BIAS
= 1µF, R
IN
= R
F
= 20kΩ (MAX9716/MAX9717A), IN+ = BIAS (MAX9716),
BTL/SE
= GND (MAX9717_), R
L
=
∞
connected between OUT+ and OUT-. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
Output Short-Circuit Current Limit
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Power-Up/Enable from Shutdown
Time (Note 10)
Shutdown Time
Input Resistance
t
PU
t
SHDN
R
IN
MAX9717B/C/D
12
C
BIAS
= 0.1µF
SYMBOL
I
SC
(Note 9)
CONDITIONS
MIN
TYP
1.1
+160
15
250
25
5
20
28
MAX
UNITS
A
°C
°C
ms
µs
kΩ
MAX9716/MAX9717
ELECTRICAL CHARACTERISTICS—3V Supply
(V
CC
= 3V, GND = 0,
SHDN
= V
CC
, T
A
= +25°C. C
BIAS
= 1µF, R
IN
= R
F
= 20kΩ (MAX9716/MAX9717A), IN+ = BIAS (MAX9716),
BTL/SE
= GND (MAX9717_), R
L
=
∞
connected between OUT+ and OUT-. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
Quiescent Supply Current
Shutdown Supply Current
SHDN
Threshold
SYMBOL
I
CC
I
SHDN
V
IH
V
IL
V
IH
BTL/SE
Threshold
V
IL
Common-Mode Bias Voltage
Output Offset Voltage
V
BIAS
V
OS
(Note 4)
V
IN-
= V
OUT+
, V
IN+
= V
BIAS
(Note 5)
V
IN+
= V
BIAS
,
V
RIPPLE
= 200mV
P-P
,
R
L
= 8Ω (Note 6)
f = 217Hz
f = 1kHz
V
CC
/2
- 9%
V
CC
/2
±7
61
dB
73
350
525
0.024
106
100
mW
%
nV/√Hz
dB
0.9 x
V
CC
0.7 x
V
CC
V
CC
/2
+ 9%
±15
V
mV
CONDITIONS
V
IN-
= V
IN+
= V
BIAS
(Note 3),
T
A
= -40°C to +85°C
SHDN
= GND
1.2
0.4
MIN
TYP
4
0.01
MAX
8.0
1
UNITS
mA
µA
V
V
Power-Supply Rejection Ratio
PSRR
Output Power
Total Harmonic Distortion Plus
Noise
Output-Noise Density
Signal-to-Noise Ratio
P
OUT
THD+N
e
n
SNR
R
L
= 8Ω, THD+N = 1%, f
IN
= 1kHz (Note 7)
R
L
= 4Ω, THD+N = 1%, f
IN
= 1kHz (Note 7)
A
V
= 6dB, R
L
= 8Ω, f
IN
= 1kHz,
P
OUT
= 0.5W, V
CC
= 3V (Note 8)
f
IN
= 10kHz
THD+N = 1%
_______________________________________________________________________________________
3
Low-Cost, Mono, 1.4W BTL Audio Power
Amplifiers
MAX9716/MAX9717
ELECTRICAL CHARACTERISTICS—3V Supply (continued)
(V
CC
= 3V, GND = 0,
SHDN
= V
CC
, T
A
= +25°C. C
BIAS
= 1µF, R
IN
= R
F
= 20kΩ (MAX9716/MAX9717A), IN+ = BIAS (MAX9716),
BTL/SE
= GND (MAX9717_), R
L
=
∞
connected between OUT+ and OUT-. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
Output Short-Circuit Current Limit
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Power-Up/Enable from Shutdown
Time (Note 10)
Shutdown Time
Input Resistance
t
PU
t
SHDN
R
IN
MAX9717B/C/D
12
C
BIAS
= 0.1µF
SYMBOL
I
SC
(Note 9)
CONDITIONS
MIN
TYP
1.1
+160
15
250
25
5
20
28
MAX
UNITS
A
°C
°C
ms
µs
kΩ
Note 1:
Continuous power dissipation must also be observed.
Note 2:
All specifications are tested at T
A
= +25°C. Specifications over temperature (T
A
= T
MIN
to T
MAX
) are not production tested,
and guaranteed by design.
Note 3:
Quiescent power-supply current is specified and tested with no load. Quiescent power-supply current depends on the off-
set voltage when a practical load is connected to the amplifier.
Note 4:
Common-mode bias voltage is the voltage on BIAS and is nominally V
CC
/2.
Note 5:
V
OS
= V
OUT+
- V
OUT-.
Note 6:
The amplifier input IN- is AC-coupled to GND through C
IN
.
Note 7:
Output power is specified by a combination of a functional output current test and characterization analysis.
Note 8:
Measurement bandwidth for THD+N is 22Hz to 22kHz.
Note 9:
Extended short-circuit conditions result in a pulsed output.
Note 10:
Time for V
OUT
to rise to 50% of final DC value.
4
_______________________________________________________________________________________
Low-Cost, Mono, 1.4W BTL Audio Power
Amplifiers
MAX9716/MAX9717
Typical Operating Characteristics
(V
CC
= 5V, THD+N measurement bandwidth = 22Hz to 22kHz, BTL mode, T
A
= +25°C, unless otherwise noted.)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9716 toc01
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9716 toc02
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
V
CC
= 3V
R
L
= 8Ω
A
V
= 6dB
MAX9716 toc03
100
V
CC
= 5V
R
L
= 8Ω
A
V
= 6dB
100
V
CC
= 5V
R
L
= 8Ω
A
V
= 12dB
100
10
10
10
THD+N (%)
THD+N (%)
1
1
THD+N (%)
1
0.1
OUTPUT POWER = 800mW
0.1
OUTPUT POWER = 800mW
0.1
OUTPUT POWER = 250mW
0.01
OUTPUT POWER = 30mW
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
0.01
OUTPUT POWER = 200mW
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
0.01
OUTPUT POWER = 30mW
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9716 toc04
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9716 toc05
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
V
CC
= 5V
R
L
= 4Ω
A
V
= 12dB
MAX9716 toc06
100
V
CC
= 3V
R
L
= 8Ω
A
V
= 12dB
100
V
CC
= 5V
R
L
= 4Ω
A
V
= 6dB
100
10
10
10
THD+N (%)
THD+N (%)
1
OUTPUT POWER = 200mW
1
OUTPUT POWER = 1W
0.1
OUTPUT POWER = 200mW
THD+N (%)
1
OUTPUT POWER = 1W
0.1
0.1
0.01
OUTPUT POWER = 50mW
0.01
0.01
OUTPUT POWER = 250mW
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9716 toc07
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
V
CC
= 3V
R
L
= 4Ω
A
V
= 12dB
MAX9716 toc08
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (SINGLE-ENDED)
V
CC
= 5V
R
L
= 16Ω
A
V
= 12dB
MAX9716 toc09
100
V
CC
= 3V
R
L
= 4Ω
A
V
= 6dB
100
100
10
1
10
10
THD+N (%)
1
OUTPUT POWER = 350mW
THD+N (%)
1
OUTPUT POWER = 350mW
0.1
THD+N (%)
0.1
0.01
0.1
OUTPUT POWER = 125mW
0.01
OUTPUT POWER = 50mW
0.01
OUTPUT POWER = 50mW
0.001
0.0001
OUTPUT POWER = 25mW
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
FREQUENCY (Hz)
10k
100k
_______________________________________________________________________________________
5
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