Diodes PAM8406 User Manual

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Description

The PAM8406 is a 5W audio amplifier with an alternative option

between Class-D and Class-AB output which makes PAM8406 very

ideally for the applications efficiency-EMI compatible.

PAM8406 offers low THD+N, high SNR allowing it to achieve high-

quality sound reproduction. The fully differential output wi th new filter

less architecture (Class-D Mode) allows the device to drive the

speaker directly, requiring no low-pass output filters and DC blocking

capacitors, thus to save the system cost and PCB area.

The efficiency of the PAM8406 is up to 90%. It can extend the battery

life, ideally for portable applications. The PAM8406 is fully protected

against faults with short circuit protection and thermal protection.

The PAM8406 is available in SOP-16L/SOP-16(EP) package.

Features

ALTERNATIVE 5W STEREO AUDIO AMPLIFIER

Pin Assignments

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 Alternative Output: Class-D or Class-AB

 5W Output at 10% THD with a 2Ω Load and 5V Power Supply

at Class-D Mode

 3W Output at 10% THD with a 4Ω Load and 5V Power Supply

 Filterless, Low Quiescent Current and No EMI

 Low THD+N at Fully Output Range

 Superior Low Noise

 Efficiency up to 90% with Class-D Mode

 No Pop At Turn-on/off

 Fully Short Circuit Protection With Auto Recovery

 Thermal Shutdown

 Few External Components to Save the Space and Cost

 SOP-16L/SOP-16(EP) Package

Typical Applications Circuit

Applications

 LCD TVs

 Mutimedia Speakers

 AM/FM System

 DABs

PAM8406

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Pin Descriptions

Pin

Number

1 +OUT_L Left Channel Positive Output

2 PGNDL Power GND

3 -OUT_L Left Channel Negative Output

4 PVDDL Power VDD

5 MUTE Mute Control Input (active low)

6 VDD Analog VDD

7 INL Left Channel Input

8 VREF Internal analog reference, connect a bypass capacitor from VREF to GND.

9 MODE High: Class-D; Low: Class-AB

10 INR Right Channel Input

11 GND Analog GND

12 SHND Shutdown Control Input (active low)

13 PVDDR Power VDD

14 -OUT_R Right Channel Negative Output

15 PGNDR Power GND

16 +OUT_R Right Channel Positive Output

Pin

Name

Functional Block Diagram

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Function

PAM8406

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Absolute Maximum Ratings (@T

These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may
affect device reliability. All voltages are with respect to ground.

Parameter Rating Unit

Supply Voltage 6.0

Input Voltage

Operation Temperature Range -40 to +85

Maximum Junction Temperature 150

Operation Junction Temperature -40 to +125

Storage Temperature -65 to +150

Soldering Temperature 300, 5 sec

Recommended Operating Conditions (@T

Parameter Rating Unit

Supply Voltage Range 2.5 to 5.5 V

Operation Temperature Range -40 to +85 °C

Junction Temperature Range -40 to +125 °C

= +25°C, unless otherwise specified.)

A

-0.3 to V

+0.3V

DD

= +25°C, unless otherwise specified.)

A

V

°C

Thermal Information

Parameter Package Symbol Max Unit

Thermal Resistance (Junction to Ambient) SOP-16

Thermal Resistance (Junction to Case) SOP-16

θ

JA

θ

JC

110

23

°C/W

PAM8406

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Electrical Characteristics

(@TA = +25°C, VDD = 5V, Gain = 24dB, RL = 8Ω, both Class-AB and D mode, unless otherwise specified.)

Symbol Parameter Test Conditions Min Typ Max Units

VDD

PO

THD+N

GV

PSRR

CS

SNR Signal-to-Noise Ratio

VN

PAM8406

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Supply Voltage 2.5 5.5 V

5.0

2.6

1.3

4.0

2.0

1.0

3.14

1.5

0.76

2.55

1.45

0.63

1.8

0.92

0.44

1.6

0.76

0.36

0.15

0.11

0.15

0.11

0.15

0.11

dB

90

85

80

10

8

6

25

15

10

Output Power

Total Harmonic
Distortion Plus Noise

Closed Loop Gain

Power Supply Ripple
Rejection

Crosstalk

Output Noise

η Efficiency

Quiescent Current

IQ

Quiescent Current

THD+N = 10%, f = 1KHz, R

= 2Ω

L

(Class-D)

THD+N = 1%, f = 1KHz, RL = 2Ω

(Class-D)

THD+N = 10%, f = 1KHz, RL = 4Ω

THD+N = 1%, f = 1KHz, RL = 4Ω

THD+N = 10%, f = 1KHz, RL = 8Ω

THD+N = 1%, f = 1KHz, RL = 8Ω

= 5.0V, PO = 0.1W to 1W , RL = 8Ω

V

DD

VDD = 3.6V, PO = 0.05W to 0.5W, RL = 8Ω

VDD = 5.0V, PO = 0.1W to 2W, RL = 4Ω

VDD = 3.6V, PO = 0.05W to 2W, RL = 4Ω

VDD = 5.0V, PO = 0.1W to 2W, RL = 2Ω

(Class-D)

VDD = 3.6V, PO = 0.05W to 1W, RL = 2Ω

(Class-D)

VDD = 3V to 5V

= 5.0V, Inputs AC-Grounded with CIN =

V

DD

0.47µF

V

= 5.0V, PO = 0.5W, RL = 8Ω,

DD

= 24db

G

V

V

= 5.0V, THD = 1%, GV = 24db

DD

VDD = 5.0V, Inputs AC-Grounded

R

= 8Ω, THD = 10%

L

RL = 4Ω, THD = 10%

RL = 2Ω, THD = 10%

V

= 5.0V

DD

VDD = 3.6V

VDD = 2.5V

V

= 5.0V

DD

VDD = 3.6V

VDD = 2.5V

= 5.0V

V

DD

VDD = 3.6V

VDD = 2.5V

= 5.0V

V

DD

VDD = 3.6V

VDD = 2.5V

= 5.0V

V

DD

VDD = 3.6V

VDD = 2.5V

= 5.0V

V

DD

VDD = 3.6V

VDD = 2.5V

= 5.0V

V

DD

VDD = 3.6V

VDD = 2.5V

= 5.0V

V

DD

VDD = 3.6V

VDD = 2.5V

f = 1kHz

f = 1kHz

f = 1kHz

f = 100Hz -70

f = 1kHz -65

f = 1kHz -95 dB

f = 1kHz 90 dB

A-Weighting 100

No A-Weighting 150

Class D Mode

f = 1kHz

No Load

No Load

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W

W

W

W

W

W

%

%

%

dB

µV

%

mA

mA

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PAM8406

Electrical Characteristics (cont.)

(@TA = +25°C, VDD = 5V, Gain = 24dB, RL = 8Ω, both Class-AB and D mode, unless otherwise specified.)

Symbol Parameter Test Conditions Min Typ Max Units

I

MUTE

ISD

R

DS(ON)

fSW

VOS

VIH

VIL

VIH

VIL

VIH

VIL

OTP

OTH

PAM8406

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Muting Current

Shutdown Current

Static Drain-to-Source
On-State Resistor

Switching Frequency

Output Offset Voltage

Enable Input High
Voltage

Enable Input Low
Voltage

MUTE Input High
Voltage

MUTE Input Low
Voltage

MODE Input High
Voltage

MODE Input Low
Voltage

Over Temperature
Protection

Over Temperature
Hysterisis

VDD = 5.0V V

VDD = 2.5V to 5.5V VSD = 0.3V

IDS = 500mA, VGS = 5V

VDD = 2.5V to 5.5V

Input AC-GND, VDD = 5.0V

VDD = 5.0V

VDD = 5.0V

VDD = 5.0V

VDD = 5.0V

VDD = 5.0V

VDD = 5.0V

No Load, Junction Temperature

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= 0.3V

MUTE

PMOS 180

NMOS 140

Class-D 250 kHz

V

= 5.0V

DD

2.4 mA

< 1 µA

mΩ

10 mV

1.4
V

0.4

1.4
V

0.4

1.4
V

0.4

150

°C

30

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