MAXIM MAX9717

19-3146; Rev 2; 3/09
KIT
ATION
EVALU
LE
B
A
IL
A
AV
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
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 supply. 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 suppression 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.
Applications
Mobile Phones
Features
♦ 2.7V to 5.5V Single-Supply Operation
♦ 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
Ordering Information
PART
TEMP RANGE
PINPACKAGE
GAIN
(dB)
MAX9716ETA+T
-40°C to +85°C 8 TDFN-EP*
Adj.
MAX9716EBL+TG45
-40°C to +85°C 3 x 3 UCSP
Adj.
MAX9716EUA
-40°C to +85°C 8 µMAX-EP*
Adj.
*EP = Exposed pad.
+Denotes a lead(Pb)-free/RoHS-compliant package.
G45 indicates protective die coating.
Ordering Information continued at end of data sheet.
Portable Devices
Pin Configurations and Selector Guide appear at end of data
sheet.
PDAs
Simplified Block Diagrams
SINGLE SUPPLY
2.7V TO 5.5V
SINGLE SUPPLY
2.7V TO 5.5V
BIAS
BIAS
MAX9716
IN-
MAX9717B/C/D
IN-
BTL/SE
VCC
UCSP is a trademark of Maxim Integrated Products, Inc.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
1
MAX9716/MAX9717
General Description
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC to GND) ..................................-0.3V to +6V
Any Other Pin to GND ...............................-0.3V to (VCC + 0.3V)
IN_, BIAS, SHDN, BTL/SE Continuous Current...................20mA
OUT_ Short-Circuit Duration to GND or VCC (Note 1)...Continuous
Continuous Power Dissipation (TA = +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
(VCC = 5V, GND = 0, SHDN = VCC, TA = +25°C. CBIAS = 1µF, RIN = RF = 20kΩ (MAX9716/MAX9717A), IN+ = BIAS (MAX9716),
BTL/SE = GND (MAX9717_), RL = ∞ connected between OUT+ and OUT-. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
Supply Voltage
VCC
Inferred by PSRR test
Quiescent Supply Current
ICC
VIN- = VIN+ = VBIAS (Note 3),
TA = -40°C to +85°C
Shutdown Supply Current
ISHDN
SHDN Threshold
MIN
TYP
MAX
UNITS
5.5
V
4.3
8
mA
0.01
1
µA
2.7
SHDN = GND
VIH
1.2
0.4
VIL
0.9 x
VCC
VIH
BTL/SE Threshold
V
0.7 x
VCC
VIL
Common-Mode Bias Voltage
Output Offset Voltage
Power-Supply Rejection Ratio
VBIAS
VOS
PSRR
VCC/2
- 6%
(Note 4)
VIN- = VOUT+, VIN+ = VBIAS (Note 5)
Total Harmonic Distortion Plus
Noise
POUT
THD+N
Output Noise Density
en
Signal-to-Noise Ratio
SNR
2
VCC/2
+ 6%
V
±7
±15
mV
DC, VBIAS = 1.5V
VIN+ = VBIAS,
VRIPPLE = 200mVP-P,
RL = 8Ω (Note 6)
f = 217Hz
61
f = 1kHz
73
RL = 4Ω, THD+N = 1%, fIN = 1kHz (Note 7)
60
VCC/2
VCC = 2.7V to 5.5V
RL = 8Ω, THD+N = 1%, fIN = 1kHz (Note 7)
Output Power
V
0.8
80
dB
1.1
1.4
W
RL = 16Ω, BTL/SE = VCC (single-ended
mode), THD+N = 1%, fIN = 1kHz
0.155
AV = 6dB, RL = 8Ω, fIN = 1kHz,
POUT = 0.5W (Note 8)
0.024
%
fIN = 10kHz
106
nV/√Hz
THD+N = 1%
105
dB
_______________________________________________________________________________________
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
MAX9716/MAX9717
ELECTRICAL CHARACTERISTICS—5V Supply (continued)
(VCC = 5V, GND = 0, SHDN = VCC, TA = +25°C. CBIAS = 1µF, RIN = RF = 20kΩ (MAX9716/MAX9717A), IN+ = BIAS (MAX9716),
BTL/SE = GND (MAX9717_), RL = ∞ connected between OUT+ and OUT-. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
Output Short-Circuit Current Limit
ISC
CONDITIONS
MIN
TYP
MAX
UNITS
1.1
A
Thermal Shutdown Threshold
+160
°C
Thermal Shutdown Hysteresis
15
°C
Power-Up/Enable from Shutdown
Time (Note 10)
250
Shutdown Time
tPU
(Note 9)
CBIAS = 0.1µF
tSHDN
Input Resistance
RIN
ms
25
5
MAX9717B/C/D
12
20
µs
28
kΩ
ELECTRICAL CHARACTERISTICS—3V Supply
(VCC = 3V, GND = 0, SHDN = VCC, TA = +25°C. CBIAS = 1µF, RIN = RF = 20kΩ (MAX9716/MAX9717A), IN+ = BIAS (MAX9716),
BTL/SE = GND (MAX9717_), RL = ∞ connected between OUT+ and OUT-. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
Quiescent Supply Current
ICC
Shutdown Supply Current
ISHDN
CONDITIONS
VIN- = VIN+ = VBIAS (Note 3),
TA = -40°C to +85°C
SHDN = GND
VIH
SHDN Threshold
MIN
TYP
MAX
UNITS
4
8.0
mA
0.01
1
µA
1.2
VIL
0.4
0.9 x
VCC
VIH
BTL/SE Threshold
V
0.7 x
VCC
VIL
Common-Mode Bias Voltage
Output Offset Voltage
Power-Supply Rejection Ratio
Output Power
VBIAS
VOS
PSRR
POUT
Total Harmonic Distortion Plus
Noise
THD+N
Output-Noise Density
en
Signal-to-Noise Ratio
SNR
V
VCC/2
- 9%
VCC/2
VCC/2
+ 9%
V
VIN- = VOUT+, VIN+ = VBIAS (Note 5)
±7
±15
mV
VIN+ = VBIAS,
VRIPPLE = 200mVP-P,
RL = 8Ω (Note 6)
f = 217Hz
61
f = 1kHz
73
(Note 4)
dB
RL = 8Ω, THD+N = 1%, fIN = 1kHz (Note 7)
350
RL = 4Ω, THD+N = 1%, fIN = 1kHz (Note 7)
525
AV = 6dB, RL = 8Ω, fIN = 1kHz,
POUT = 0.5W, VCC = 3V (Note 8)
mW
0.024
%
fIN = 10kHz
106
nV/√Hz
THD+N = 1%
100
dB
_______________________________________________________________________________________
3
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
ELECTRICAL CHARACTERISTICS—3V Supply (continued)
(VCC = 3V, GND = 0, SHDN = VCC, TA = +25°C. CBIAS = 1µF, RIN = RF = 20kΩ (MAX9716/MAX9717A), IN+ = BIAS (MAX9716),
BTL/SE = GND (MAX9717_), RL = ∞ connected between OUT+ and OUT-. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
Output Short-Circuit Current Limit
ISC
CONDITIONS
MIN
TYP
MAX
UNITS
1.1
A
Thermal Shutdown Threshold
+160
°C
Thermal Shutdown Hysteresis
15
°C
Power-Up/Enable from Shutdown
Time (Note 10)
250
Shutdown Time
Input Resistance
tPU
(Note 9)
CBIAS = 0.1µF
tSHDN
RIN
ms
25
5
MAX9717B/C/D
12
20
µs
28
kΩ
Note 1: Continuous power dissipation must also be observed.
Note 2: All specifications are tested at TA = +25°C. Specifications over temperature (TA = TMIN to TMAX) 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 offset voltage when a practical load is connected to the amplifier.
Note 4: Common-mode bias voltage is the voltage on BIAS and is nominally VCC/2.
Note 5: VOS = VOUT+ - VOUT-.
Note 6: The amplifier input IN- is AC-coupled to GND through CIN.
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 VOUT to rise to 50% of final DC value.
4
_______________________________________________________________________________________
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
OUTPUT POWER = 800mW
0.1
OUTPUT POWER = 800mW
1
0.01
OUTPUT POWER = 30mW
0.001
100
1k
10k
0.001
10
100k
100
1k
10k
100k
1k
10k
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
0.01
OUTPUT POWER = 50mW
1
OUTPUT POWER = 1W
0.1
100
1k
10k
MAX9716 toc06
OUTPUT POWER = 250mW
0.001
10
100k
OUTPUT POWER = 1W
0.1
0.01
0.001
0.001
1
OUTPUT POWER = 200mW
0.01
VCC = 5V
RL = 4Ω
AV = 12dB
10
THD+N (%)
OUTPUT POWER = 200mW
10
THD+N (%)
0.1
VCC = 5V
RL = 4Ω
AV = 6dB
100k
100
MAX9716 toc05
100
MAX9716 toc04
1
100
1k
10k
100k
10
100
1k
10k
100k
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY (SINGLE-ENDED)
VCC = 3V
RL = 4Ω
AV = 6dB
VCC = 3V
RL = 4Ω
AV = 12dB
10
100
MAX9716 toc09
100
MAX9716 toc07
100
10
100
FREQUENCY (Hz)
VCC = 3V
RL = 8Ω
AV = 12dB
10
10
FREQUENCY (Hz)
100
10
OUTPUT POWER = 30mW
OUTPUT POWER = 200mW
0.001
10
OUTPUT POWER = 250mW
0.1
0.01
0.01
THD+N (%)
MAX9716 toc02
1
VCC = 3V
RL = 8Ω
AV = 6dB
10
THD+N (%)
0.1
100
MAX9716 toc08
THD+N (%)
1
VCC = 5V
RL = 8Ω
AV = 12dB
10
THD+N (%)
VCC = 5V
RL = 8Ω
AV = 6dB
10
100
MAX9716 toc01
100
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX9716 toc03
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
VCC = 5V
RL = 16Ω
AV = 12dB
10
OUTPUT POWER = 350mW
0.1
THD+N (%)
THD+N (%)
THD+N (%)
1
1
1
OUTPUT POWER = 350mW
0.1
0.1
OUTPUT POWER = 125mW
0.01
0.01
OUTPUT POWER = 50mW
0.01
OUTPUT POWER = 50mW
0.001
0.0001
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
OUTPUT POWER = 25mW
0.001
10
100
1k
FREQUENCY (Hz)
10k
100k
10
100
1k
10k
100k
FREQUENCY (Hz)
_______________________________________________________________________________________
5
MAX9716/MAX9717
Typical Operating Characteristics
(VCC = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, BTL mode, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VCC = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, BTL mode, TA = +25°C, unless otherwise noted.)
fIN = 100Hz
0.1
fIN = 10kHz
0.2
0.4
0.6
0.8
1.0
1.2
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0
500
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
0.01
1
fIN = 100Hz
0.1
0.01
fIN = 1kHz
200
300
400
500
1
fIN = 10kHz
0.1
0.01
0.001
100
VCC = 5V
RL = 4Ω
AV = 12dB
10
fIN = 1kHz
fIN = 100Hz
0.001
fIN = 10kHz
MAX9716 toc15
VCC = 5V
RL = 4Ω
AV = 6dB
10
100
MAX9716 toc14
MAX9716 toc13
100
THD+N (%)
0.1
fIN = 100Hz
fIN = 1kHz
0.001
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
OUTPUT POWER (mW)
OUTPUT POWER (W)
OUTPUT POWER (W)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (SINGLE-ENDED)
fIN = 1kHz
fIN = 10kHz
0.1
fIN = 100Hz
0.001
1
fIN = 1kHz
fIN = 10kHz
0.1
0.01
fIN = 100Hz
0.001
100 200 300 400 500 600 700 800
OUTPUT POWER (mW)
100
VCC = 5V
RL = 16Ω
AV = 6dB
10
THD+N (%)
1
VCC = 3V
RL = 4Ω
AV = 12dB
10
THD+N (%)
VCC = 3V
RL = 4Ω
AV = 6dB
MAX9716 toc18
100
MAX9716 toc16
100
0
400
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
fIN = 10kHz
0.01
300
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
1
10
200
OUTPUT POWER (mW)
VCC = 3V
RL = 8Ω
AV = 12dB
0
100
OUTPUT POWER (W)
THD+N (%)
THD+N (%)
fIN = 1kHz
OUTPUT POWER (W)
100
10
fIN = 10kHz
0.001
0
1.4
fIN = 100Hz
0.1
fIN = 100Hz
0.001
0
1
0.01
fIN = 1kHz
fIN = 1kHz
0.001
VCC = 3V
RL = 8Ω
AV = 6dB
10
0.01
0.01
6
MAX9716 toc11
1
0.1
100
THD+N (%)
fIN = 10kHz
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9716 toc17
THD+N (%)
1
VCC = 5V
RL = 8Ω
AV = 12dB
10
THD+N (%)
VCC = 5V
RL = 8Ω
AV = 6dB
10
100
MAX9716 toc10
100
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
MAX9716 toc12
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
THD+N (%)
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
fIN = 100Hz
fIN = 1kHz
1
fIN = 10kHz
0.1
0.01
0.001
0
100 200 300 400 500 600 700 800
OUTPUT POWER (mW)
0
25 50 75 100 125 150 175 200 225 250
OUTPUT POWER (mW)
_______________________________________________________________________________________
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
THD+N = 10%
0.9
0.6
2.0
THD+N = 10%
1.5
1.0
THD+N = 1%
THD+N = 1%
3.0
3.5
4.0
4.5
5.5
5.0
3.0
3.5
4.0
4.5
5.0
5.5
MAX9716 toc21
1
10
100
LOAD RESISTANCE (Ω)
OUTPUT POWER
vs. LOAD RESISTANCE
POWER DISSIPATION
vs. OUTPUT POWER
POWER DISSIPATION
vs. OUTPUT POWER
400
THD+N = 10%
300
THD+N = 1%
0.6
0.4
0
1
10
150
100
0
0
100
200
50
100
0
VCC = 3V
RL = 8Ω
f = 1kHz
AV = 6dB
250
0.2
MAX9716 toc24
0.8
300
MAX9716 toc23
VCC = 5V
RL = 8Ω
f = 1kHz
AV = 6dB
POWER DISSIPATION (mW)
500
200
1.0
POWER DISSIPATION (W)
600
0.3
0.6
0.9
1.2
1.5
0
100
200
300
400
LOAD RESISTANCE (Ω)
OUTPUT POWER (W)
OUTPUT POWER (mW)
POWER DISSIPATION
vs. OUTPUT POWER
POWER DISSIPATION
vs. OUTPUT POWER
OUTPUT-NOISE DENSITY
vs. FREQUENCY
0.8
500
400
300
200
0.4
100
0
0.8
1.2
OUTPUT POWER (W)
1.6
2.0
500
AV = 6dB
500
400
300
200
100
0
0
0.4
600
OUTPUT-NOISE DENSITY (nV/√Hz)
1.2
VCC = 3V
RL = 4Ω
f = 1kHz
AV = 6dB
600
POWER DISSIPATION (mW)
VCC = 5V
RL = 4Ω
f = 1kHz
AV = 6dB
MAX9716 toc26
700
MAX9716 toc25
2.0
POWER DISSIPATION (W)
THD+N = 1%
SUPPLY VOLTAGE (V)
VCC = 3V
f = 1kHz
AV = 6dB
0
1.0
SUPPLY VOLTAGE (V)
700
1.6
THD+N = 10%
0
2.5
MAX9716 toc22
2.5
1.5
0.5
0
0
OUTPUT POWER (mW)
2.0
0.5
0.3
VCC = 5V
f = 1kHz
AV = 6dB
MAX9716 toc27
1.2
RL = 4Ω
f = 1kHz
AV = 6dB
2.5
2.5
MAX9716 toc20
RL = 8Ω
f = 1kHz
AV = 6dB
OUTPUT POWER (W)
OUTPUT POWER (W)
3.0
MAX9716 toc19
1.8
1.5
OUTPUT POWER
vs. LOAD RESISTANCE
OUTPUT POWER
vs. SUPPLY VOLTAGE
OUTPUT POWER (mW)
OUTPUT POWER
vs. SUPPLY VOLTAGE
0
100
200
300
400
500
OUTPUT POWER (mW)
600
700
100
1k
10k
100k
FREQUENCY (Hz)
_______________________________________________________________________________________
7
MAX9716/MAX9717
Typical Operating Characteristics (continued)
(VCC = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, BTL mode, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
(VCC = 5V, THD+N measurement bandwidth = 22Hz to 22kHz, BTL mode, TA = +25°C, unless otherwise noted.)
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX9716 toc29
60
30
-30
PSRR (dB)
GAIN AND PHASE (°/dB)
-10
-20
0
-40
-50
-30
-60
-60
6.0
5.5
5.0
SUPPLY CURRENT (mA)
AV = 60dB
90
SUPPLY CURRENT vs. VCC
0
MAX9716 toc28
120
4.5
4.0
3.5
3.0
-70
-90
2.5
-80
-120
2.0
-90
10
100
1k
10k
100k
1M
10M
MAX9716 toc30
GAIN AND PHASE vs. FREQUENCY
10
100
1k
10k
FREQUENCY (Hz)
SUPPLY CURRENT
vs. TEMPERATURE
COMING OUT OF SHUTDOWN
3.1
2.7
100k
FREQUENCY (Hz)
3.5
3.9
4.3
4.7
MAX9716 toc31
5
5.5
GOING INTO SHUTDOWN
MAX9716 toc33
SHDN
2V/div
RL = 8Ω
RL = 8Ω
VCC = 5V
OUT+
1V/div
OUT1V/div
4
VCC = 3V
SHDN
2V/div
OUT+
1V/div
OUT1V/div
OUT+ - OUT200mV/div
3
2
OUT+ - OUT200mV/div
1
-40
-15
10
35
60
10μs/div
100ms/div
85
TEMPERATURE (°C)
SHUTDOWN CURRENT
vs. TEMPERATURE
SHUTDOWN CURRENT vs. VCC
35
SHUTDOWN CURRENT (nA)
16
14
12
10
8
6
4
MAX9716 toc35
18
SHUTDOWN CURRENT (nA)
40
MAX9716 toc34
20
30
25
20
VCC = 5V
15
10
VCC = 3V
5
2
0
0
2.5
3.0
3.5
4.0
VCC (V)
8
5.1
VCC (V)
MAX9716 toc32
6
SUPPLY CURRENT (mA)
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
4.5
5.0
5.5
-40
-15
10
35
60
TEMPERATURE (°C)
_______________________________________________________________________________________
85
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
PIN
BUMP
TDFN/µMAX
NAME
UCSP
FUNCTION
MAX9716
MAX9717
MAX9716 MAX9717
1
1
C3
C3
SHDN
2
2
C1
C1
BIAS
3
—
A3
—
IN+
Noninverting Input
4
4
A1
A1
IN-
Inverting Input
5
5
A2
A2
OUT+
6
6
B3
B3
VCC
Power Supply. Bypass VCC with a 1µF capacitor to ground.
7
7
B1, B2
B1, B2
GND
Ground
8
8
C2
C2
OUT-
Bridge Amplifier Negative Output. OUT- becomes high-impedance
when BTL/SE is driven high.
—
3
—
A3
BTL/SE
EP
EP
—
—
EP
Active-Low Shutdown
DC Bias Bypass Capacitor Connection. Bypass BIAS to ground with a
1µF capacitor.
Bridge Amplifier Positive Output
BTL/Single-Ended Mode Input. Logic low sets the device in BTL mode.
Logic high sets the device in single-ended mode.
Exposed Pad. Connect EP to GND.
Detailed Description
The MAX9716/MAX9717 are 1.3W BTL speaker amplifiers. Both devices feature a low-power shutdown
mode, and industry-leading click-and-pop suppression.
The MAX9717 features a headphone sense input that
disables the slave BTL amplifier to drive the headphone
as a single-ended load. These devices consist of high
output-current audio amps configured as BTL amplifiers (see Functional Diagrams). The closed-loop gain
of the input op amp sets the single-ended gain of the
device. Two external gain resistors set the gain of the
MAX9716 and MAX9717A (see the Gain-Setting
Resistor section). The MAX9717B/C/D feature internally
set gains of 6dB, 9dB, and 12dB, respectively.
The output of the first amplifier serves as the input of the
second amplifier, which is configured as an inverting
unity-gain follower. This results in two outputs, identical in
amplitude, but 180° out-of-phase.
BIAS
The MAX9716/MAX9717 operate from a single 2.7V to
5.5V supply and feature an internally generated, commonmode bias voltage of VCC/2 referenced to ground. BIAS
provides both click-and-pop suppression and sets the DC
bias level for the audio outputs. The MAX9716 can be
configured as a single-ended or differential input. For single-ended input, connect the noninverting input IN+ to
BIAS externally. The MAX9717 BIAS is internally connected to the amplifier noninverting input IN+.
input. Always bypass BIAS to ground with a capacitor.
Choose the value of the bypass capacitor as described in
the BIAS Capacitor section. Do not connect external loads
to BIAS. Any load lowers the BIAS voltage, affecting the
overall performance of the device.
BTL/SE Control Input
The MAX9717 features a headphone sense input,
BTL/SE, that enables headphone jack sensing to control the power amplifier output configuration. Driving
BTL/SE low enables the slave amplifier (OUT-). Driving
BTL/SE high disables the slave amplifier.
Shutdown Mode
The MAX9716/MAX9717 feature a low-power shutdown
mode that reduces quiescent current consumption to
10nA. Entering shutdown disables the bias circuitry,
forces the amplifier outputs to GND through an internal
20kΩ resistor. Drive SHDN low to enter shutdown
mode; drive SHDN high for normal operation.
Click-and-Pop Suppression
The MAX9716/MAX9717 feature Maxim’s industry-leading
click-and-pop suppression circuitry. During startup, the
amplifier common-mode bias voltage ramps to the DC
bias. When entering shutdown, the amplifier outputs are
pulled to GND through an internal 20kΩ resistor. This
scheme minimizes the energy present in the audio band.
The MAX9717 can only be used with a single-ended
_______________________________________________________________________________________
9
MAX9716/MAX9717
Pin Description
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
Power Dissipation and Heat Sinking
VOUT(P-P)
+1
Under normal operating conditions, the MAX9716/
MAX9717 dissipate a significant amount of power. The
maximum power dissipation for each package is given
in the Absolute Maximum Ratings section under
Continuous Power Dissipation or can be calculated by
the following equation:
2 x VOUT(P-P)
VOUT(P-P)
-1
Figure 1. Bridge-Tied Load Configuration
Applications Information
BTL Amplifier
The MAX9716/MAX9717 are designed to drive a load
differentially, a configuration referred to as bridge-tied
load or BTL. The BTL configuration (Figure 1) offers
advantages over the single-ended configuration, where
one side of the load is connected to ground. Driving the
load differentially doubles the output voltage compared
to a single-ended amplifier under similar conditions.
Thus, the differential gain of the device is twice the
closed-loop gain of the input amplifier. The effective
gain is given by:
AV = 2 ×
RF
RIN
Substituting 2 x VOUT(P-P) for VOUT(P-P) into the following
equations yields four times the output power due to
doubling of the output voltage:
VRMS =
VOUT(P − P)
2 2
2
V
POUT = RMS
RL
There is no net DC voltage across the load because the
differential outputs are each biased at midsupply. This
eliminates the need for DC-blocking capacitors
required for single-ended amplifiers. These capacitors
can be large and expensive, consume board space,
and degrade low-frequency performance.
10
PDISSPKG(MAX) =
TJ(MAX) − TA
θ JA
where TJ(MAX) is +150°C, TA is the ambient temperature,
and θJA is the reciprocal of the derating factor in °C/W as
specified in the Absolute Maximum Ratings section. For
example, θJA of the TDFN package is 41°C/W.
The increase in power delivered by the BTL configuration
directly results in an increase in internal power dissipation
over the single-ended configuration. The maximum power
dissipation for a given VCC and load is given by the
following equation:
PDISS(MAX) =
2VCC2
π 2 RL
If the power dissipation for a given application exceeds
the maximum allowed for a given package, reduce
power dissipation by increasing the ground plane heatsinking capability and the size of the traces to the device
(see the Layout and Grounding section). Other methods
for reducing power dissipation are to reduce V CC ,
increase load impedance, decrease ambient temperature, reduce gain, or reduce input signal.
Thermal-overload protection limits total power dissipation
in the MAX9716/MAX9717. Thermal protection circuitry
disables the amplifier output stage when the junction
temperature exceeds +160°C. The amplifiers are
enabled once the junction temperature cools by 15°C. A
pulsing output under continuous thermal-overload conditions results as the device heats and cools.
Fixed Gain
The MAX9717B, MAX9717C, and MAX9717D feature
internally fixed gains of 6dB, 9dB, and 12dB, respectively (see the Selector Guide). Fixed gain simplifies
designs, reduces pin count, decreases required footprint size, and eliminates external gain-setting resistors.
Resistors R IN and R F shown in the MAX9717B/C/D
Typical Operating Circuit are used to achieve each
fixed gain.
______________________________________________________________________________________
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
BIAS
OUTIN+
RIN
OUT+
IN-
1
f−3dB =
RF
Figure 2. Setting the MAX9716/MAX9717A Gain
Adjustable Gain
Gain-Setting Resistors
External feedback resistors set the gain of the
MAX9716 and MAX9717A. Resistors RF and RIN (see
Figure 2) set the gain of the amplifier as follows:
⎛R ⎞
AV = 2⎜ F ⎟
⎝ RIN ⎠
Where AV is the desired voltage gain. Hence, an RIN of
20kΩ and an RF of 20kΩ yields a gain of 2V/V, or 6dB.
RF can be either fixed or variable, allowing the use of a
digitally controlled potentiometer to alter the gain under
software control.
The gain of the MAX9717 in a single-ended output
configuration is half the gain when configured as BTL
output. Choose R F between 10kΩ and 50kΩ for the
MAX9716 and MAX9717A. Gains for the MAX9717B/C/D
are set internally.
Input Filter
CIN and RIN form a highpass filter that removes the DC
bias from an incoming signal. The AC-coupling capacitor allows the amplifier to bias the signal to an optimal
DC level. Assuming zero-source impedance, the -3dB
point of the highpass filter is:
f−3dB =
1
2πRINCIN
Setting f -3dB too high affects the low-frequency
response of the amplifier. Use capacitors with
dielectrics that have low-voltage coefficients, such as
tantalum or aluminum electrolytic. Capacitors with highvoltage coefficients, such as ceramics, can increase
distortion at low frequencies.
2πRLCOUT
As with the input capacitor, choose COUT such that
f-3dB is well below the lowest frequency of interest.
Setting f-3dB too high affects the amplifier’s low-frequency response. Load impedance is a concern when
choosing COUT. Load impedance can vary, changing
the -3dB point of the output filter. A lower impedance
increases the corner frequency, degrading low-frequency response. Select COUT such that the worstcase load/C OUT combination yields an adequate
response. Select capacitors with low ESR to minimize
resistive losses and optimize power transfer to the load.
Differential Input
The MAX9716 can be configured for a differential input.
The advantage of differential inputs is that any common-mode noise is attenuated and not passed through
the amplifier. This input improves noise rejection and
provides common-mode rejection (Figure 3). External
components should be closely matched for high
CMRR. Figure 4 shows the MAX9716 configured for a
differential input.
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
0
VRIPPLE = 200mVP-P
RL = 8Ω
CBIAS = 1μF
-10
-20
-30
CMRR (dB)
AUDIO
INPUT
CIN
MAX9716
-40
-50
-60
-70
-80
-90
-100
10
100
1k
10k
100k
FREQUENCY (Hz)
Figure 3. CMRR with Differential Input
______________________________________________________________________________________
11
MAX9716/MAX9717
Output-Coupling Capacitor
The MAX9717 require output-coupling capacitors to
operate in single-ended (headphone) mode. The output-coupling capacitor blocks the DC component of the
amplifier output, preventing DC current from flowing to
the load. The output capacitor and the load impedance
form a highpass filter with a -3dB point determined by:
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
RF
20kΩ
VCC
220pF
VCC
ON
CLICKLESS/POPLESS
SHUTDOWN
CONTROL
SHDN
OFF
BIAS
CBIAS
OUT-
20kΩ
CIN
0.33μF
AUDIO
INPUT
CIN
0.33μF
AUDIO
INPUT
RIN
20kΩ
IN+
20kΩ
OUT+
RIN
20kΩ
INGND
MAX9716
RF
20kΩ
220pF
VALUES SHOWN FOR 0dB GAIN.
Figure 4. MAX9716 Differential Input
BIAS Capacitor
Layout and Grounding
BIAS is the output of the internally-generated VCC/2 bias
voltage. The BIAS bypass capacitor, CBIAS, improves the
power-supply rejection ratio by reducing power supply
and other noise sources at the common-mode bias node.
CBIAS also generates the clickless/popless startup DC
bias waveform for the speaker amplifiers. Bypass BIAS
with a 1µF capacitor to GND. Larger C BIAS values
improve PSRR but slow down tON time. Do not connect
external loads to BIAS.
Proper PC board layout and grounding is essential for
optimizing performance. Use large traces for the
power-supply inputs and amplifier outputs to minimize
losses due to parasitic trace resistance. Large traces
also aid in moving heat away from the package. Proper
grounding improves audio performance and prevents
digital switching noise from coupling into the audio signal.
Supply Bypassing
Proper power-supply bypassing ensures low-noise,
low-distortion performance. Connect a 1µF ceramic
capacitor from V CC to GND. Add additional bulk
capacitance as required by the application. Connect
the bypass capacitor as close to the device as possible.
12
The MAX9716/MAX9717 TDFN and µMAX packages
feature exposed thermal pads on their undersides. This
pad lowers the thermal resistance of the package by
providing a direct-heat conduction path from the die to
the printed circuit board. Connect the exposed pad to
the ground plane using multiple vias, if required.
______________________________________________________________________________________
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
For the latest application details on UCSP construction,
dimensions, tape carrier information, printed circuit board
techniques, bump-pad layout, and recommended reflow
temperature profile, as well as the latest information on
reliability testing results, refer to the application note,
“UCSP—A Wafer-Level Chip-Scale Package” available
on Maxim’s web site at http://www.maxim-ic.com/ucsp.
UCSP Marking Information
Pin A1 Bump Indicator
AAA: Product ID code
XXX: Lot Code
AAA
XXX
Ordering Information (continued)
PART
TEMP RANGE
PINPACKAGE
GAIN
(dB)
MAX9717AEBL+TG45 -40°C to +85°C 3 x 3 UCSP
Adj.
MAX9717AETA+T
-40°C to +85°C 8 TDFN-EP*
Adj.
MAX9717AEUA
-40°C to +85°C 8 µMAX-EP*
Adj.
MAX9717BEBL+TG45 -40°C to +85°C 3 x 3 UCSP
6
MAX9717BETA+T
-40°C to +85°C 8 TDFN-EP*
6
MAX9717BEUA
-40°C to +85°C 8 µMAX-EP*
6
MAX9717CEBL+TG45 -40°C to +85°C 3 x 3 UCSP
9
MAX9717CETA+T
-40°C to +85°C 8 TDFN-EP*
9
MAX9717CEUA
-40°C to +85°C 8 µMAX-EP*
9
MAX9717DEBL+TG45 -40°C to +85°C 3 x 3 UCSP
12
MAX9717DETA+T
-40°C to +85°C 8 TDFN-EP*
12
MAX9717DEUA
-40°C to +85°C 8 µMAX-EP*
12
*EP = Exposed pad.
+Denotes a lead(Pb)-free/RoHS-compliant package.
G45 indicates protective die coating.
Selector Guide
PART
BTL/SE INPUT
GAIN (dB)
MAX9716
—
Adjustable
MAX9717A
√
Adjustable
MAX9717B
√
6
MAX9717C
√
9
MAX9717D
√
12
Chip Information
TRANSISTOR COUNT: 4877
PROCESS: BiCMOS
______________________________________________________________________________________
13
MAX9716/MAX9717
UCSP Applications Information
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
MAX9716/MAX9717
Pin Configurations
TOP VIEW
SHDN
1
BIAS
2
8
OUT-
7
GND
SHDN
1
8
OUT-
7
GND
3
6
VCC
IN- 4
5
OUT+
BIAS 2
MAX9717
MAX9716
3
6
VCC
IN- 4
5
OUT+
IN+
BTL/SE
μMAX
μMAX
MAX9716
TOP VIEW
(BUMPS ON BOTTOM)
MAX9717
1
2
3
A
IN-
OUT+
IN+
B
GND
GND
C
BIAS
OUT-
1
2
3
A
IN-
OUT+
BTL/SE
VCC
B
GND
GND
VCC
SHDN
C
BIAS
OUT-
SHDN
UCSP
(1.5mm x 1.5mm)
SHDN
1
BIAS
2
IN+
3
IN-
4
MAX9716
8
OUT-
SHDN
1
7
GND
BIAS
2
6
VCC
5
OUT+
TDFN
(3mm x 3mm x 0.8mm)
14
UCSP
(1.5mm x 1.5mm)
BTL/SE
3
IN-
4
MAX9717
8
OUT-
7
GND
6
VCC
5
OUT+
TDFN
(3mm x 3mm x 0.8mm)
______________________________________________________________________________________
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
VCC
1μF
VCC
ON
CLICKLESS/POPLESS
SHUTDOWN
CONTROL
SHDN
OFF
BIAS
CBIAS
1μF
OUT-
20kΩ
IN+
CIN
0.33μF
AUDIO
INPUT
20kΩ
OUT+
RIN
20kΩ
INGND
MAX9716
RF
40kΩ
VALUES SHOWN FOR 12dB GAIN.
VCC
1μF
VCC
ON
CLICKLESS/POPLESS
SHUTDOWN
CONTROL
SHDN
OFF
BIAS
CBIAS
1μF
OUT-
1kΩ
20kΩ
COUT
100μF
20kΩ
CIN
0.33μF
AUDIO
INPUT
RIN
20kΩ
OUT+
IN-
BTL/SE
100kΩ
MAX9717A
VALUES SHOWN FOR BTL 12dB GAIN,
HEADPHONE 6dB GAIN.
RF
40kΩ
GND
100kΩ
VCC
______________________________________________________________________________________
15
MAX9716/MAX9717
Functional Diagrams/Typical Operating Circuits
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
MAX9716/MAX9717
Functional Diagrams/Typical Operating Circuits (continued)
VCC
1μF
VCC
ON
CLICKLESS/POPLESS
SHUTDOWN
CONTROL
SHDN
OFF
BIAS
CBIAS
1μF
OUT-
1kΩ
20kΩ
IN+
CIN
0.33μF
AUDIO
INPUT
IN-
COUT
100μF
20kΩ
OUT+
RIN
20kΩ
BTL/SE
RF
100kΩ
GND
100kΩ
VCC
MAX9717B
MAX9717C
MAX9717D
16
______________________________________________________________________________________
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
PACKAGE CODE
DOCUMENT NO.
8 µMAX
U8E-2
21-0107
8 TDFN-EP
T833-1
21-0137
3 x 3 UCSP
B9-1
21-0093
8L, μMAX, EXP PAD.EPS
PACKAGE TYPE
21-0107
C
1
1
______________________________________________________________________________________
17
MAX9716/MAX9717
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
6, 8, &10L, DFN THIN.EPS
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
18
______________________________________________________________________________________
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
COMMON DIMENSIONS
PACKAGE VARIATIONS
SYMBOL
MIN.
MAX.
PKG. CODE
N
D2
E2
e
JEDEC SPEC
b
[(N/2)-1] x e
A
0.70
0.80
T633-2
6
1.50±0.10
2.30±0.10
0.95 BSC
MO229 / WEEA
0.40±0.05
1.90 REF
D
2.90
3.10
T833-2
8
1.50±0.10
2.30±0.10
0.65 BSC
MO229 / WEEC
0.30±0.05
1.95 REF
E
2.90
3.10
T833-3
8
1.50±0.10
2.30±0.10
0.65 BSC
MO229 / WEEC
0.30±0.05
1.95 REF
A1
0.00
0.05
T1033-1
10
1.50±0.10
2.30±0.10
0.50 BSC
MO229 / WEED-3
0.25±0.05
2.00 REF
L
0.20
0.40
T1033-2
10
1.50±0.10
2.30±0.10
0.50 BSC
MO229 / WEED-3
0.25±0.05
2.00 REF
k
0.25 MIN.
T1433-1
14
1.70±0.10
2.30±0.10
0.40 BSC
----
0.20±0.05
2.40 REF
A2
0.20 REF.
T1433-2
14
1.70±0.10
2.30±0.10
0.40 BSC
----
0.20±0.05
2.40 REF
______________________________________________________________________________________
19
MAX9716/MAX9717
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
Package Information (continued)
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
9LUCSP, 3x3.EPS
MAX9716/MAX9717
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
PACKAGE OUTLINE, 3x3 UCSP
21-0093
20
______________________________________________________________________________________
L
1
1
Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers
REVISION
NUMBER
REVISION
DATE
2
3/09
DESCRIPTION
Added lead-free and G45 options to Ordering Information
PAGES
CHANGED
1, 13
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ___________________ 21
© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX9716/MAX9717
Revision History