MAXIM MAX9717 User Manual

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 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

Features

o 2.7V to 5.5V Single-Supply Operation
o 1.4W into 4Ω at 1% THD+N

o 10nA Low-Power Shutdown Mode

o 73dB PSRR at 1kHz

o No Audible Clicks or Pops at Power-Up/Down

o Internal Fixed Gain to Reduce Component Count

(MAX9717B/C/D)

o Adjustable Gain Option (MAX9716/MAX9717A)
o BTL /SE Input Senses when Headphones are

Connected (MAX9717)

o Pin Compatible with LM4890 (MAX9716)

o Pin Compatible with TPA711 (MAX9717A)

o Available in Compact, Thermally Enhanced µMAX

and TDFN (3mm x 3mm) Packages

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio

Power Amplifiers

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

Simplified Block Diagrams

19-3146; Rev 3; 3/12

Pin Configurations and Selector Guide appear at end of data
sheet.

EVALUATION KIT

AVAILABLE

UCSP is a trademark of Maxim Integrated Products, Inc.
µMAX is a registered trademark of Maxim Integrated Products, Inc.

*

EP = Exposed pad.

+

Denotes a lead(Pb)-free/RoHS-compliant package.
G45 indicates protective die coating.
/V denotes automotive qualified part.

Ordering Information continued at end of data sheet.

Mobile Phones

PDAs

Portable Devices

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.

PART TEMP RANGE

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.

MAX9716EUA/V+ -40°C to +85°C 8 µMAX-EP* Adj.

PIN­PACKAGE

GAIN

(dB)

SINGLE SUPPLY

2.7V TO 5.5V

BIAS

MAX9716

IN-

IN-

SINGLE SUPPLY

2.7V TO 5.5V

BIAS

MAX9717B/C/D

BTL/SE

V

CC

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—5V Supply

(VCC= 5V, V

GND

= 0V, SHDN = VCC, TA= +25°C. C

BIAS

= 1µF, RIN= RF= 20kΩ (MAX9716/MAX9717A), IN+ = BIAS (MAX9716),

BTL/SE = GND (MAX9717_), R

L

= ∞ connected between OUT+ and OUT-. Typical values are at TA= +25°C.) (Note 2)

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.

Supply Voltage (VCCto 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

Soldering Temperature (reflow)

Lead(Pb)-Free Packages..............................................+260°C

Packages Containing Lead(Pb)....................................+240°C

Supply Voltage V

Quiescent Supply Current I

Shutdown Supply Current I

SHDN Threshold

BTL/SE Threshold

Common-Mode Bias Voltage V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CC

CC

SHDN

V

V

V

V

BIAS

Inferred by PSRR test 2.7 5.5 V

V

= V

IN+

= V

IN-

= -40°C to +85°C

T

A

SHDN = GND 0.01 1 µA

IH

IL

IH

IL

(Note 4)

(Note 3),

BIAS

4.3 8 mA

1.2

0.4

0.9 x
V

CC

0.7 x
V

CC

V

CC

- 6%

/2

V

CC

V

/2

CC

/2

+ 6%

V

V

V

Output Offset Voltage V

OS

Power-Supply Rejection Ratio PSRR

Output Power P

Total Harmonic Distortion Plus
Noise

OUT

THD+N

Output Noise Density e

V

= V

IN-

VCC = 2.7V to 5.5V DC, V

V

= V

IN+

V

RIPPLE

= 8Ω (Note 6)

R

L

RL = 8Ω, THD+N = 1%, f

RL = 4Ω, THD+N = 1%, f

RL = 16Ω, BTL/SE = VCC (single-ended
mode), THD+N = 1%, f

A

= 6dB, RL = 8Ω, fIN = 1kHz,

V

P

OUT

fIN = 10kHz 106 nV/√Hz

n

, V

OUT+

BIAS

= 200mV

= V

IN+

,

P-P

= 0.5W (Note 8)

(Note 5) ±7 ±15 mV

BIAS

= 1.5V 60 80

BIAS

f = 217Hz 61

,

f = 1kHz 73

= 1kHz (Note 7) 0.8 1.1

IN

= 1kHz (Note 7) 1.4

IN

= 1kHz

IN

0.155

0.024 %

Signal-to-Noise Ratio SNR THD+N = 1% 105 dB

dB

W

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio

Power Amplifiers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS—5V Supply (continued)

(VCC= 5V, V

GND

= 0V, SHDN = VCC, TA= +25°C. C

BIAS

= 1µF, RIN= RF= 20kΩ (MAX9716/MAX9717A), IN+ = BIAS (MAX9716),

BTL/SE = GND (MAX9717_), R

L

= ∞ connected between OUT+ and OUT-. Typical values are at TA= +25°C.) (Note 2)

ELECTRICAL CHARACTERISTICS—3V Supply

(VCC= 3V, V

GND

= 0V, SHDN = VCC, TA= +25°C. C

BIAS

= 1µF, RIN= RF= 20kΩ (MAX9716/MAX9717A), IN+ = BIAS (MAX9716),

BTL/SE = GND (MAX9717_), R

L

= ∞ connected between OUT+ and OUT-. Typical values are at TA= +25°C.) (Note 2)

Output Short-Circuit Current Limit I

Thermal Shutdown Threshold +160 °C

Thermal Shutdown Hysteresis 15 °C

Power-Up/Enable from Shutdown
Time (Note 10)

Shutdown Time t

Input Resistance R

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SC

t

PU

SHDN

(Note 9) 1.1 A

250

C

= 0.1µF 25

BIAS

5µs

MAX9717B/C/D 12 20 28 kΩ

IN

Quiescent Supply Current I

Shutdown Supply Current I

SHDN Threshold

BTL/SE Threshold

Common-Mode Bias Voltage V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

V

= V

CC

SHDN

V

IH

V

IL

V

IH

V

IL

BIAS

IN+

= V

IN-

T

= -40°C to +85°C

A

SHDN = GND 0.01 1 µA

(Note 4)

BIAS

(Note 3),

1.2

0.9 x
V

V

CC

- 9%

CC

4 8.0 mA

/2

/2

V

CC

0.4

0.7 x
V

CC

V

CC

+ 9%

/2

ms

V

V

V

Output Offset Voltage V

OS

Power-Supply Rejection Ratio PSRR

Output Power P

Total Harmonic Distortion Plus
Noise

OUT

THD+N

Output-Noise Density e

V

= V

IN-

= V

V

IN+

V

RIPPLE

= 8Ω (Note 6)

R

L

RL = 8Ω, THD+N = 1%, f

RL = 4Ω, THD+N = 1%, f

AV = 6dB, RL = 8Ω, fIN = 1kHz,
P

OUT

fIN = 10kHz 106 nV/√Hz

n

, V

= V

OUT+

,

BIAS

= 200mV

IN+

P-P

(Note 5) ±7 ±15 mV

BIAS

f = 217Hz 61

,

f = 1kHz 73

= 1kHz (Note 7) 350

IN

= 1kHz (Note 7) 525

IN

= 0.5W, VCC = 3V (Note 8)

0.024 %

dB

mW

Signal-to-Noise Ratio SNR THD+N = 1% 100 dB

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS—3V Supply (continued)

(VCC= 3V, V

GND

= 0V, SHDN = VCC, TA= +25°C. C

BIAS

= 1µF, RIN= RF= 20kΩ (MAX9716/MAX9717A), IN+ = BIAS (MAX9716),

BTL/SE = GND (MAX9717_), R

L

= ∞ connected between OUT+ and OUT-. Typical values are at TA= +25°C.) (Note 2)

Note 1: Continuous power dissipation must also be observed.
Note 2: All specifications are tested at T

A

= +25°C. Specifications over temperature (TA = 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 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 V

OUT

to rise to 50% of final DC value.

Output Short-Circuit Current Limit I

Thermal Shutdown Threshold +160 °C

Thermal Shutdown Hysteresis 15 °C

Power-Up/Enable from Shutdown
Time (Note 10)

Shutdown Time t

Input Resistance R

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SC

t

PU

SHDN

IN

(Note 9) 1.1 A

250

C

= 0.1µF 25

BIAS

5µs

MAX9717B/C/D 12 20 28 kΩ

ms

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio

Power Amplifiers

_______________________________________________________________________________________

5

Typical Operating Characteristics

(VCC= 5V, THD+N measurement bandwidth = 22Hz to 22kHz, BTL mode, TA= +25°C, unless otherwise noted.)

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

100

VCC = 5V

= 8

R

Ω

L

= 6dB

A

10

V

1

THD+N (%)

0.1

0.01

0.001

OUTPUT POWER = 800mW

OUTPUT POWER = 30mW

10 100k

FREQUENCY (Hz)

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

100

VCC = 3V

= 8

R

Ω

L

= 12dB

A

10

V

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

100

VCC = 5V

= 8

R

Ω

MAX9716 toc01

THD+N (%)

10k1k100

L

= 12dB

A

10

V

1

0.1

0.01

0.001

OUTPUT POWER = 800mW

OUTPUT POWER = 200mW

10 100k

FREQUENCY (Hz)

10k1k100

MAX9716 toc02

THD+N (%)

0.001

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

100

VCC = 5V

= 4

R

Ω

MAX9716 toc04

L

= 6dB

A

10

V

MAX9716 toc05

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

100

VCC = 3V

= 8

R

Ω

L

= 6dB

A

10

V

1

0.1

0.01

OUTPUT POWER = 250mW

OUTPUT POWER = 30mW

10 100k

FREQUENCY (Hz)

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

100

VCC = 5V

= 4

R

Ω

L

= 12dB

A

10

V

MAX9716 toc03

10k1k100

MAX9716 toc06

1

THD+N (%)

0.1

0.01

0.001

OUTPUT POWER = 200mW

OUTPUT POWER = 50mW

10 100k

FREQUENCY (Hz)

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

100

VCC = 3V

= 4

R

Ω

L

A

= 6dB

10

V

1

THD+N (%)

0.01

0.001

OUTPUT POWER = 350mW

0.1

OUTPUT POWER = 50mW

10 100k

FREQUENCY (Hz)

1

THD+N (%)

0.1

0.01

0.001

10k1k100

10 100k

OUTPUT POWER = 1W

OUTPUT POWER = 200mW

10k1k100

FREQUENCY (Hz)

TOTAL HARMONIC DISTORTION

PLUS NOISE vs. FREQUENCY

100

VCC = 3V

= 4

R

Ω

MAX9716 toc07

THD+N (%)

10k1k100

L

A

= 12dB

10

V

1

0.1

0.01

0.001

OUTPUT POWER = 350mW

OUTPUT POWER = 50mW

10 100k

FREQUENCY (Hz)

MAX9716 toc08

10k1k100

1

THD+N (%)

0.1

0.01

0.001

OUTPUT POWER = 1W

OUTPUT POWER = 250mW

10 100k

FREQUENCY (Hz)

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY (SINGLE-ENDED)

100

VCC = 5V

= 16

R

Ω

L

10

A

= 12dB

V

1

0.1

THD+N (%)

0.01

0.001

0.0001

OUTPUT POWER = 125mW

OUTPUT POWER = 25mW

10 100k

FREQUENCY (Hz)

10k1k100

MAX9716 toc09

10k1k100

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VCC= 5V, THD+N measurement bandwidth = 22Hz to 22kHz, BTL mode, TA= +25°C, unless otherwise noted.)

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. OUTPUT POWER

MAX9716 toc10

OUTPUT POWER (W)

THD+N (%)

1.21.00.80.60.40.2

0.01

0.1

1

10

100

0.001

01.4

VCC = 5V
R

L

= 8

Ω

A

V

= 6dB

fIN = 100Hz

fIN = 1kHz

fIN = 10kHz

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. OUTPUT POWER

MAX9716 toc12

OUTPUT POWER (mW)

THD+N (%)

400300200100

0.01

0.1

1

10

100

0.001
0 500

VCC = 3V
R

L

= 8

Ω

A

V

= 6dB

fIN = 100Hz

fIN = 1kHz

fIN = 10kHz

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. OUTPUT POWER

MAX9716 toc13

OUTPUT POWER (mW)

THD+N (%)

400300200100

0.01

0.1

1

10

100

0.001
0 500

VCC = 3V
R

L

= 8

Ω

A

V

= 12dB

fIN = 100Hz

fIN = 1kHz

fIN = 10kHz

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. OUTPUT POWER

MAX9716 toc14

OUTPUT POWER (W)

THD+N (%)

1.81.61.41.21.00.80.60.40.2

0.01

0.1

1

10

100

0.001

02.0

VCC = 5V
R

L

= 4

Ω

A

V

= 6dB

fIN = 1kHz

fIN = 100Hz

fIN = 10kHz

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. OUTPUT POWER

MAX9716 toc17

OUTPUT POWER (mW)

THD+N (%)

700600500400300200100

0.01

0.1

1

10

100

0.001
0 800

VCC = 3V
R

L

= 4

Ω

A

V

= 12dB

fIN = 1kHz

fIN = 100Hz

fIN = 10kHz

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER (SINGLE-ENDED)

MAX9716 toc18

OUTPUT POWER (mW)

THD+N (%)

225200175150125100755025

0.01

0.1

1

10

100

0.001
0250

VCC = 5V
R

L

= 16

Ω

A

V

= 6dB

fIN = 100Hz

fIN = 10kHz

fIN = 1kHz

TOTAL HARMONIC DISTORTION PLUS

100

10

NOISE vs. OUTPUT POWER

VCC = 5V

= 8

R

Ω

L

= 12dB

A

V

1

MAX9716 toc11

THD+N (%)

0.001

TOTAL HARMONIC DISTORTION PLUS

100

10

NOISE vs. OUTPUT POWER

VCC = 3V

= 4

R

Ω

L

A

= 6dB

V

MAX9716 toc16

0.1

0.01

fIN = 10kHz

fIN = 1kHz

0

fIN = 100Hz

1.41.21.00.80.60.40.2

OUTPUT POWER (W)

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. OUTPUT POWER

100

VCC = 5V

= 4

R

Ω

L

= 12dB

A

V

10

1

fIN = 10kHz

THD+N (%)

0.1

0.01

0.001

fIN = 100Hz

02.0

fIN = 1kHz

OUTPUT POWER (W)

MAX9716 toc15

1.81.61.41.21.00.80.60.40.2

1

THD+N (%)

0.1

0.01

0.001
0 800

fIN = 1kHz

fIN = 100Hz

OUTPUT POWER (mW)

fIN = 10kHz

700600500400300200100

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio

Power Amplifiers

_______________________________________________________________________________________

7

Typical Operating Characteristics (continued)

(VCC= 5V, THD+N measurement bandwidth = 22Hz to 22kHz, BTL mode, TA= +25°C, unless otherwise noted.)

OUTPUT POWER

vs. SUPPLY VOLTAGE

1.8
RL = 8

Ω

f = 1kHz

1.5

= 6dB

A

V

1.2

0.9

0.6

OUTPUT POWER (W)

0.3

0

2.5 5.5

THD+N = 10%

THD+N = 1%

SUPPLY VOLTAGE (V)

OUTPUT POWER

vs. LOAD RESISTANCE

700

600

500

400

300

OUTPUT POWER (mW)

200

100

THD+N = 1%

THD+N = 10%

5.04.54.03.53.0

VCC = 3V
f = 1kHz

= 6dB

A

V

3.0

2.5

MAX9716 toc19

2.0

1.5

1.0

OUTPUT POWER (W)

0.5

0

1.0

MAX9716 toc22

0.8

0.6

0.4

POWER DISSIPATION (W)

0.2

OUTPUT POWER

vs. SUPPLY VOLTAGE

RL = 4Ω
f = 1kHz

= 6dB

A

V

SUPPLY VOLTAGE (V)

POWER DISSIPATION

vs. OUTPUT POWER

VCC = 5V

= 8

R

Ω

L

f = 1kHz

= 6dB

A

V

THD+N = 10%

THD+N = 1%

5.04.54.03.53.02.5 5.5

2.5

MAX9716 toc20

2.0

1.5

1.0

OUTPUT POWER (mW)

0.5

0

300

250

MAX9716 toc23

200

150

100

POWER DISSIPATION (mW)

50

VCC = 5V
f = 1kHz
A

1100

OUTPUT POWER

vs. LOAD RESISTANCE

= 6dB

V

THD+N = 1%

LOAD RESISTANCE (Ω)

POWER DISSIPATION

vs. OUTPUT POWER

VCC = 3V

= 8Ω

R

L

f = 1kHz

= 6dB

A

V

MAX9716 toc21

THD+N = 10%

10

MAX9716 toc24

0

101 100

LOAD RESISTANCE (Ω)

POWER DISSIPATION

0

01.5

POWER DISSIPATION

vs. OUTPUT POWER

2.0
VCC = 5V

= 4

R

Ω

L

f = 1kHz

1.6
A

= 6dB

V

1.2

0.8

POWER DISSIPATION (W)

0.4

0

02.0
OUTPUT POWER (W)

1.61.20.80.4

700

600

MAX9716 toc25

500

400

300

200

POWER DISSIPATION (mW)

100

0

0 700

VCC = 3V

= 4Ω

R

L

f = 1kHz

= 6dB

A

V

OUTPUT POWER (W)

vs. OUTPUT POWER

OUTPUT POWER (mW)

1.20.90.60.3

0

OUTPUT POWER (mW)

4003002001000 500

OUTPUT-NOISE DENSITY

vs. FREQUENCY

600

500

Hz)

MAX9716 toc26

√

400

300

200

OUTPUT-NOISE DENSITY (nV/

100

0

600500400300200100

100 100k

FREQUENCY (Hz)

AV = 6dB

MAX9716 toc27

10k1k

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers

8 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VCC= 5V, THD+N measurement bandwidth = 22Hz to 22kHz, BTL mode, TA= +25°C, unless otherwise noted.)

SUPPLY CURRENT vs. V

CC

MAX9716 toc30

VCC (V)

SUPPLY CURRENT (mA)

5.14.73.1 3.5 3.9 4.3

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

2.0

2.7 5.5

SHUTDOWN CURRENT vs. V

CC

MAX9716 toc34

VCC (V)

SHUTDOWN CURRENT (nA)

5.04.54.03.53.0

2

4

6

8

10

12

14

16

18

20

0

2.5 5.5

SHUTDOWN CURRENT

vs. TEMPERATURE

MAX9716 toc35

TEMPERATURE (°C)

SHUTDOWN CURRENT (nA)

6035-15 10

5

10

15

20

25

30

35

40

0

-40 85

VCC = 5V

VCC = 3V

GAIN AND PHASE vs. FREQUENCY

120

AV = 60dB

90

60

30

0

-30

GAIN AND PHASE (°/dB)

-60

-90

-120
10 10M

FREQUENCY (Hz)

1M100k100 1k 10k

MAX9716 toc28

PSRR (dB)

0

-10

-20

-30

-40

-50

-60

-70

-80

-90

SUPPLY CURRENT

vs. TEMPERATURE

6

5

4

3

SUPPLY CURRENT (mA)

2

1

VCC = 5V

VCC = 3V

-40 85

TEMPERATURE (°C)

603510-15

MAX9716 toc31

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

10 100k

FREQUENCY (Hz)

COMING OUT OF SHUTDOWN

RL = 8

Ω

100ms/div

10k1k100

MAX9716 toc32

MAX9716 toc29

SHDN
2V/div

OUT+
1V/div

OUT­1V/div

OUT+ - OUT­200mV/div

GOING INTO SHUTDOWN

10µs/div

MAX9716 toc33

RL = 8

Ω

SHDN
2V/div

OUT+
1V/div
OUT­1V/div

OUT+ - OUT­200mV/div

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+.

The MAX9717 can only be used with a

single-ended 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.

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio

Power Amplifiers

_______________________________________________________________________________________ 9

Pin/Bump Description

PIN BUMP

TDFN/µMAX UCSP

MAX9716 MAX9717 MAX9716 MAX9717

1 1 C3 C3 SHDN Active-Low Shutdown

2 2 C1 C1 BIAS

3 — A3 — IN+ Noninverting Input

4 4 A1 A1 IN- Inverting Input

5 5 A2 A2 OUT+ Bridge Amplifier Positive Output

6 6 B3 B3 V

7 7 B1, B2 B1, B2 GND Ground

8 8 C2 C2 OUT-

—3—A3BTL/SE

— — — — EP Exposed Pad (TDFN and µMAX Only). Connect EP to GND.

NAME FUNCTION

DC Bias Bypass Capacitor Connection. Bypass BIAS to ground with a
1µF capacitor.

Power Supply. Bypass VCC with a 1µF capacitor to ground.

CC

Bridge Amplifier Negative Output. OUT- becomes high-impedance
when BTL/SE is driven high.

BTL/Single-Ended Mode Input. Logic low sets the device in BTL mode.
Logic high sets the device in single-ended mode.

MAX9716/MAX9717

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:

Substituting 2 x V

OUT(P-P)

for V

OUT(P-P)

into the following
equations yields four times the output power due to
doubling of the output voltage:

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.

Power Dissipation and Heat Sinking

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:

where T

J(MAX)

is +150°C, TAis the ambient temperature,

and θJAis the reciprocal of the derating factor in °C/W as
specified in the

Absolute Maximum Ratings

section. For

example, θJAof 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 VCCand load is given by the
following equation:

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 VCC,
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 RINand RFshown in the MAX9717B/C/D

Typical Operating Circuit

are used to achieve each

fixed gain.

Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers

10 ______________________________________________________________________________________

Figure 1. Bridge-Tied Load Configuration

+1

-1

V

OUT(P-P)

2 x V

V

OUT(P-P)

OUT(P-P)

A

=×2

V

V

=

=

OUT P P

22

V

RMS

R

V

RMS

P

OUT

R

F

R

IN

()

−

2

L

P

DISSPKG MAX

()

=

TT

J MAX A

−

()

θ

JA

V

2

P

DISS MAX

()

=

CC

2

R

π

L

2

Adjustable Gain

Gain-Setting Resistors

External feedback resistors set the gain of the
MAX9716 and MAX9717A. Resistors RFand RIN(see
Figure 2)set the gain of the amplifier as follows:

Where AVis the desired voltage gain. Hence, an RINof
20kΩ and an RFof 20kΩ yields a gain of 2V/V, or 6dB.
R

F

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

CINand RINform 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:

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.

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:

As with the input capacitor, choose C

OUT

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 C

OUT

. Load impedance can vary, changing
the -3dB point of the output filter. A lower impedance
increases the corner frequency, degrading low-fre­quency response. Select C

OUT

such that the worst-

case 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.

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio

Power Amplifiers

______________________________________________________________________________________ 11

Figure 2. Setting the MAX9716/MAX9717A Gain

Figure 3. CMRR with Differential Input

BIAS

IN+

MAX9716

C

IN

R

AUDIO

INPUT

IN

IN-

R

F

OUT-

OUT+

⎛

⎞

R

A

=

V

F

2

⎜

⎟

R

⎝

⎠

IN

2

π

RC

1

IN IN

f

dB

−=3

2

π

RC

1

L OUT

f

dB

−=3

COMMON-MODE REJECTION RATIO

0

-10

-20

-30

-40

-50

CMRR (dB)

-60

-70

-80

-90

-100
10 100k

vs. FREQUENCY

V

RIPPLE

RL = 8Ω
C

BIAS

FREQUENCY (Hz)

= 200mV

= 1µF

10k1k100

P-P

MAX9716/MAX9717

BIAS Capacitor

BIAS is the output of the internally-generated VCC/2 bias
voltage. The BIAS bypass capacitor, C

BIAS

, improves the
power-supply rejection ratio by reducing power supply
and other noise sources at the common-mode bias node.
C

BIAS

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 tONtime. Do not connect
external loads to BIAS.

Supply Bypassing

Proper power-supply bypassing ensures low-noise,
low-distortion performance. Connect a 1µF ceramic
capacitor from VCCto GND. Add additional bulk
capacitance as required by the application. Connect
the bypass capacitor as close to the device as possible.

Layout and Grounding

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.

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

12 ______________________________________________________________________________________

Figure 4. MAX9716 Differential Input

R

F

20kΩ

V

CC

220pF

C

BIAS

C

IN

R

0.33µF

AUDIO

INPUT

0.33µF

AUDIO

INPUT

VALUES SHOWN FOR 0dB GAIN.

IN

20kΩ

C

IN

R

IN

20kΩ

BIAS

IN+

IN-

V

CC

CLICKLESS/POPLESS

SHUTDOWN

CONTROL

20kΩ

20kΩ

MAX9716

R

F

20kΩ

220pF

SHDN

OUT-

OUT+

GND

ON

OFF

UCSP Applications Information

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

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio

Power Amplifiers

______________________________________________________________________________________ 13

Selector Guide

Ordering Information (continued)

Chip Information

PROCESS: BiCMOS

*

EP = Exposed pad.

+

Denotes a lead(Pb)-free/RoHS-compliant package.

G45 indicates protective die coating.

AAA
XXX

PART TEMP RANGE

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

PIN­PACKAGE

GAIN

(dB)

PART BTL/SE INPUT GAIN (dB)

MAX9716 — Adjustable
MAX9717A √ Adjustable
MAX9717B √ 6
MAX9717C √ 9
MAX9717D √ 12

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers

14 ______________________________________________________________________________________

Pin/Bump Configurations

TOP VIEW

1

SHDN

2

MAX9716

3

IN+

4

µMAX

MAX9716

TOP VIEW

(BUMPS ON BOTTOM)

123

IN- OUT+ IN+

A

B

GND V

GND

BIAS SHDNOUT-

C

UCSP

(1.5mm x 1.5mm)

1

SHDN

87OUT-

6

5

CC

8

GNDBIAS

V

CC

OUT+IN-

OUT-

SHDN

BTL/SE

SHDN

1

2

MAX9717

3

4

µMAX

MAX9717

123

IN- OUT+ BTL/SE

A

B

GND V

GND

BIAS SHDNOUT-

C

UCSP

(1.5mm x 1.5mm)

1

87OUT-

6

5

CC

GNDBIAS

V

CC

OUT+IN-

8

OUT-

2

BIAS

MAX9716

3

IN+

4

IN-

TDFN

(3mm x 3mm x 0.8mm)

7

GND

6

V

CC

5

OUT+

BIAS

BTL/SE

2

MAX9717

3

4

IN-

7

GND

6

V

CC

5

OUT+

TDFN

(3mm x 3mm x 0.8mm)

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio

Power Amplifiers

______________________________________________________________________________________ 15

Functional Diagrams/Typical Operating Circuits

CLICKLESS/POPLESS

SHUTDOWN

CONTROL

BIAS

IN-

OUT+

OUT-

SHDN

GND

MAX9717A

R

F

40kΩ

V

CC

R

IN

20kΩ

C

IN

0.33µF

AUDIO

INPUT

C

BIAS

1µF

20kΩ

20kΩ

V

CC

VALUES SHOWN FOR BTL 12dB GAIN,
HEADPHONE 6dB GAIN.

1µF

BTL/SE

C

OUT

100µF

100kΩ

V

CC

1kΩ

OFF

ON

100kΩ

C

BIAS

1µF

C

IN

R

IN

0.33µF

AUDIO

INPUT

VALUES SHOWN FOR 12dB GAIN.

20kΩ

V

CC

1µF

BIAS

IN+

IN-

V

CC

CLICKLESS/POPLESS

SHUTDOWN

CONTROL

20kΩ

20kΩ

MAX9716

R

F

40kΩ

SHDN

OUT-

OUT+

GND

ON

OFF

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers

16 ______________________________________________________________________________________

Functional Diagrams/Typical Operating Circuits (continued)

V

CC

1µF

BIAS

C

BIAS

1µF

IN+

C

AUDIO

INPUT

IN

0.33µF

R

IN

20kΩ

IN-

V

CC

R

MAX9717B
MAX9717C
MAX9717D

CLICKLESS/POPLESS

20kΩ

F

SHUTDOWN

CONTROL

20kΩ

BTL/SE

SHDN

OUT-

OUT+

GND

100kΩ

OFF

ON

C

OUT

100µF

100kΩ

1kΩ

V

CC

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio

Power Amplifiers

______________________________________________________________________________________ 17

Package Information

For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or
“-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing per­tains to the package regardless of RoHS status.

PACKAGE TYPE PACKAGE CODE OUTLINE NO.

8 µMAX U8E+2 21-0107 90-0145

8 TDFN-EP T833+1 21-0137 90-0059

9 UCSP B9+1 21-0093 —

LAND

PATTERN NO.

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers

18 ______________________________________________________________________________________

Package Information (continued)

For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a "+", "#", or
"-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing per­tains to the package regardless of RoHS status.

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio

Power Amplifiers

______________________________________________________________________________________ 19

Package Information (continued)

For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a "+", "#", or
"-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing per­tains to the package regardless of RoHS status.

COM MO N DIMENSIONS

SYM BOL

MIN . M AX.

A0.70 0.80

D2.90 3.10

E2.90 3.10

A1

0.00 0.05

L0.20 0.40

0.25 MIN.k

A2 0.20 REF.

PACKAG E VARIATIONS

PKG. CO DE

T633-2

T833-2

T833-3

T1033-1

T1033M K -1

T1033-2

T1433-1

N D2 E2 e

61.50±0.10 2.30±0.10 0.95 B S C M O 229 / W EEA 0.40±0.05 1.90 REF

81.50±0.10 2.30±0.10

81.50±0.10 2.30±0.10

1.50± 0.10

1.70± 0.10 2.30±0.1014

JEDEC SPEC

0.65 B S C M O 229 / W EEC

0.65 B S C M O 229 / W EEC

2.30± 0.1010

2.30± 0.101.50±0.10

2.30± 0.10 M O 229 / W EED-32.00 REF0.25±0.050.50 BSC1.50± 0.1010

0.50 BSC

0.50 B S C M O 229 / W EED -3

0.40 BSC

0.40 BSC

0.40 BSC

M O 229 / W EED -3

- - - -

- - - - 0.20±0.05 2.40 REFT1433-3F 14 2.30± 0.101.70±0.10

b

[(N/2)-1] x e

0.30± 0.05 1.95 REF

0.30± 0.05 1.95 REF

2.00 REF0.25± 0.05

0.25± 0.05 2.00 REF10

2.40 REF0.20± 0.05- - - -

0.20± 0.05 2.40 REFT1433-214 2.30±0.101.70±0.10

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio
Power Amplifiers

20 ______________________________________________________________________________________

Package Information (continued)

For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a "+", "#", or
"-" in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing per­tains to the package regardless of RoHS status.

MAX9716/MAX9717

Low-Cost, Mono, 1.4W BTL Audio

Power Amplifiers

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. The parametric values (min and max limits) shown in
the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.

21

____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

© 2012 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

Revision History

REVISION

NUMBER

2 3/09 Added lead-free and G45 options to Ordering Information 1, 13

3 3/12 Add automotive qualified part 1

REVISION

DATE

DESCRIPTION

PAGES

CHANGED