Diodes PAM8304 User Manual

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Description

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PAM8304

3W MONO CLASS D AUDIO AMPLIFIER

Pin Assignments

The PAM8304 is a mono filter-less Class-D amplifier with high SNR

and differential input that helps eliminate noise. The PAM8304

supports 2.8V to 6V operation make it idea for up to 4 cells alkaline

battery applications. The PAM8304 is capable of driving speaker

loads as low as 3Ω speaker with a 5V supply maximizing the output

power.

Features like greater than 90% efficiency and small PCB area make

the PAM8304 Class-D amplifier ideal for portable applications. The

output uses a filter-less architecture minimizing the number of

external components and PCB area whilst providing a high

performance, simple and lower cost system.

The PAM8304 features short circuit protection, thermal shutdown and

NEW PRODUCT

under voltage lock-out.

The PAM8304 is available in DFN3030-8L and MOP-8L packages.

Features

 Supply Voltage from 2.8V to 6.0 V

 3Ω Driving Capability

 3.0W@10% THD Output with a 4Ω Load and 5V Supply

 High Efficiency up to 90% @1W with an 8Ω Load

 Shutdown Current <1μA

 Superior Low Noise without Input

 Short Circuit Protection

 Thermal Shutdown

 Available in Space Saving DFN3030-8L and MSOP-8L

Packages

 Pb-Free Package

DFN3X3-8L

To p V i ew

1

OUT +

2

PVDD

VDD

3

4

IN- IN+

MSOP-8L

To p V i e w

OUT +

1

PVDD

2

VDD

3

IN- IN+

4

Applications

 MP4/MP3

 GPS

 Set-Top-Box

 Tablets/Digital Photo Frame

 Electronic Dictionary

 Portable Game Machines

XXXYW

XXXYW

OUT-

8

P8304

P8304

GND

7

6

SD

5

OUT-

8

GND

7

6

SD

5

Typical Applications Circuit

DD

1Fμ

VDD

OUT+

OUT-

GND

VIN

/SD

0.1 Fμ

0.1 Fμ

IN+

IN-

/SD

PVDD

PAM8304

PGND

PAM8304

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Pin Descriptions

Pin Name MSOP-8L/DFN3x3-8L Function

OUT+ 1 Positive BTL Output

PVDD 2 Power Supply

VDD 3 Analog Power Supply

IN- 4 Negative Differential Input

IN+ 5 Positive Differential Input

/SD 6 Shutdown Terminal, Active Low

GND 7 Ground

OUT- 8 Negative BTL Output

Exposed Pad — NC

Functional Block Diagram

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PAM8304

VDD

IN+

PWM

Modulator

OSC

Protection

IN-

SD

-

+

SD

Bias and

Vref

Absolute Maximum Ratings

Parameter Rating Unit

Supply Voltage (VDD) 6.5 V

Input Voltage (IN+, IN-, /SD) -0.3 to VDD +0.3 V

Storage Temperature -65 to +150 °C

Maximum Junction Temperature 150 °C

Recommended Operating Conditions (@T

(@TA = +25°C, unless otherwise specified.)

= +25°C, unless otherwise specified.)

A

UVLO

Startup

Gate

Drive

Gate

Drive

SC

Protect

OTP

PVDD

OUT +

OUT-

GND

Symbol Parameter Min Max Unit

VDD Supply Voltage 2.8 6.0 V

TA Operating Ambient Temperature Range -40 +85 °C

TJ Junction Temperature Range -40 +125 °C

PAM8304

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Electrical Characteristics (@TA=25°C, VDD=5V, Gain=18dB, RL=L(33μH)+R+L(33μH), unless otherwise noted.)

Symbol Parameter Test Conditions Min Typ Max Unit

VDD Supply Voltage 2.8 6.0 V

3.0

2.4

1.75

1.40

0.17

0.14

-68

170

93

325 mΩ

NEW PRODUCT

THD+N = 10%, f = 1kHz,
R = 4Ω

THD+N = 1%, f = 1kHz,
R = 4Ω

Po Output Power

THD+N = 10%, f = 1kHz,
R = 8Ω

THD+N = 1%, f = 1kHz,
R = 8Ω

VDD = 5.0V, Po = 1W, R = 8Ω

THD+N

PSRR

Dyn Dynamic Range VDD = 5V,THD = %, R = 8Ω f=1kHz 95 dB

Vn Output Noise Inputs ac-grounded

η Efficiency

IQ Quiescent Current VDD = 5V No Load 5 mA

Isd Shutdown Current VDD = 2.8V to 5V /SD=0V 1 μA

Rdson

fsw Switching Frequency VDD = 2.8V to 5V 400 kHz

Gv Closed-loop Gain VDD = 2.8V to 5V 300K/Rin V/V

Vos Output Offset Voltage Input ac-ground, VDD = 5V 50 mV

VIH SD Input High Voltage VDD = 5V 1.4

VIL SD Input Low Voltage VDD = 5V 1.0

Total Harmonic
Distortion Plus
Noise

Power Supply Ripple
Rejection

Static Drain-to Source On­state Resistor

VDD = 3.6V, Po = 0.1W, R = 8Ω 0.16

VDD = 3.2V, Po =0.1W, R = 8Ω 0.14

VDD = 5.0V, Po = 0.5W, R = 4Ω

VDD = 3.6V, Po = 0.2W, R = 4Ω 0.16

VDD = 3.2V, Po = 0.1W, R = 4Ω 0.17

VDD = 3.6V, Inputs ac-grounded
with C = 1μF

RL = 8Ω,THD = 10%

RL = 4Ω,THD = 10% 86

High Side PMOS,I = 500mA VDD=5.0V

Low Side NMOS,I = 500mA VDD=5.0V 200 mΩ

VDD = 5.0V

VDD = 3.6V 1.5

VDD = 3.2V 1.2

VDD = 5.0V

VDD = 3.6V 1.25

VDD = 3.2V 1.0

VDD = 5.0V

VDD = 3.6V 0.90

VDD = 3.2V 0.70

VDD = 5.0V

VDD = 3.6V 0.72

VDD = 3.2V 0.60

f = 1kHz

f = 1kHz

f=217Hz

f=1kHz -70

f=10kHz -67

No A
weighting

A-weighting 130

f=1kHz

PAM8304

W

W

W

W

%

%

dB

μV

%

V

PAM8304

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PAM8304

Performance Characteristics (@TA=25°C, VDD=5V, Gain=18dB, RL=L(33μH)+R+L(33μH), unless otherwise noted.)

THD+N Vs. Output Power (RL=4Ω) THD+N Vs. Output Power (RL=8Ω)

20

10

5

VDD=5.0V

2

%

1

0.5

VDD=3.6V

0.2

0.1
1m 52m 5m 10m 20m 50m 100m 200m 500m 1 2

NEW PRODUCT

W

THD+N Vs. Frequency PSRR Vs. Frequency

10

Po=300mW

5

2

1

0.5

%

0.2

0.1

0.05

0.02
20 20k50 100 200 500 1k 2k 5k 10k

VDD=5.0V

VDD=3.6V

Hz

Frequency Response Noise Floor

+20

+19.5

+19

+18.5

+18

+17.5

+17

+16.5

+16

d

+15.5

B

+15

g

+14.5

A

+14

+13.5

+13

+12.5

+12

+11.5

+11

+10.5

+10

20 20k50 100 200 500 1k 2k 5k 10k

Hz

VDD=5.0V

PAM8304

Document number: DS36589 Rev. 1 - 2

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20

10

5

2

%

1

0.5

0.2

0.1
1m 32m 5m 10m 20m 50m 100m 200m 500m 1 2

+0

-10

-15

-20

-25

-30

-35

d

-40

B

-45

-50

-55

-60

-65

-70

-75

-80

+20

+10

+0

-10

-20

-30

-40

d

B

-50

r

-60

A

-70

-80

-90

-100

-110

-120

T

-5

VDD=5.0V

20 20k50 100 200 500 1k 2k 5k 10k

VDD=5.0V

20 20k50 100 200 500 1k 2k 5k 10k

VDD=5.0V

VDD=3.6V

W

Hz

Hz

October 2013

© Diodes Incorporated