Diodes PAM8603A User Manual

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PAM8603A

ANTI-SATURATION FILTERLESS 3W CLASS-D STEREO AMPLIFIER

WITH DC VOLUME CONTROL AND HEADPHONE OUTPUT

Description

The PAM8603A is a 3W, Class-D audio amplifier with headphone

amplifier. Advanced 64-Step DC volume control minimizes external

components and allows speaker volume control and headphone

volume control. PAM unique antisaturation technology which detects

output signal clip due to the over level input signal suppress the

output signal clip automatically. Also the antisaturation function can

adapt the output clip caused by power supply voltage down with

battery. It offers low THD+N, to produce highquality sound

reproduction. The new filterless architecture allows the device to

drive the speaker directly, without low-pass output filters which will

save system cost and PCB area.

With the same numbers of external components, the efficiency of the

PAM8603A is much better than Class-AB cousins. It can extend the

battery life thus be ideal for portable applications.

The PAM8603A is available in a SSOP-24 package.

Features

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

• Filterless, Low Quiescent Current and Low EMI

• Low THD+N

• 64-Step DC Volume Control

• Headphone Output Function

• Unique Anti-Saturation Function

• Superior Low Noise

• Low Pop Noise

• Efficiency Up to 90%

• Short Circuit Protection

• Thermal Shutdown

• Few External Components to Save the Space and Cost

• Pb-Free Package

PAM8603A

Document number: DSxxxxx Rev. 1 - 2

Pin Assignments

Applications

• LCD Monitors / TV Projectors

• Notebook Computers

• Portable Speakers

• Portable DVD Players, Game Machines

• VoIP/Speakers Phones

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Typical Applications Circuit

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PAM8603A

Pin Descriptions

Number

1 +OUT_L Left Channel Positive Output

2 PGNDL Left Channel Power GND

3 PGNDL Left Channel Positive GND

4 -OUT_L Left Channel Negative Output

5 PVDDL Left Channel Power Supply

6 MUTE Mute Control Input (active low)

7 VDD Analog VDD

8 IN L Left Channel Input

9 EAR IN L Left Earphone Input

10 VDC Analog Reference for gain Control Section

11 VOLUME DC Voltage Control to Set the Gain of Class-D

12 EAR OUT L Left Earphone Output

13 EAR OUT R Right Earphone Output

14 VREF Internal Analog Reference, Connect a Bypass Capacitor from VREF to GND

15 LINE/EAR Line/ Ear Detect

16 EAR IN R Right Earphone Input

17 INR Right Channel Input

18 GND Analog GND

19 SHDN Shutdown Control Input (active low)

20 PVDDR Right Channel Power Supply

21 -OUT_R Right Channel Negaitive Output

22 PGNDR Right Channel Power GND

23 PGNDR Right Channel Power GND

24 +OUT_R Right Channel Positive Output

PAM8603A

Document number: DSxxxxx Rev. 1 - 2

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Function

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Functional Block Diagram

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PAM8603A

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

Maximum Junction Temperature 150

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

Ambient Temperature Range -20 to +85 °C

Junction Temperature Range -20 to +125 °C

= +25°C, unless otherwise specified.)

A

-0.3 to V

+0.3

DD

= +25°C, unless otherwise specified.)

A

V

°C

Thermal Information

Parameter Package Symbol Max Unit

Thermal Resistance (Junction to Ambient) SSOP-24

PAM8603A

Document number: DSxxxxx Rev. 1 - 2

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96 °C/W

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PAM8603A

Electrical Characteristics (@T

Parameter Symbol Test Conditions Min Typ Max Units

Class D Stage

Supply Voltage Range

Quiescent Current

Output Offset Voltage

Drain-Source On-State Resistance

Output Power

Total Harmonic Distortion Plus Noise THD+N

Power Supply Ripple Rejection PSRR

Channel Separation CS

Oscillator Frequency

Efficiency η

Noise

Signal Noise Ratio SNR f = 20 – 20kHz, THD = 1% 85 dB

Earphone Stage

Quiescent Current IQ No Load 4.5 7.5 mA

Output Offset Voltage

Output Power

Total Harmonic Distortion Plus Noise THD+N

Power Supply Ripple Rejection PSRR

Channel Separation CS

Noise

Signal Noise Ratio SNR

Control Section

Under Voltage Lock-Out UVLO 2

Mute Current

Shutdown Current

Ear/ Line Threshold Voltage

SHDN Input High

MUTE Input High

Over Temperature Protection OTP 140 °C

Over Temperature Hysteresis OTH 30 °C

PAM8603A

Document number: DSxxxxx Rev. 1 - 2

= +25°C, VDD = 5V, Gain = Maximum, RL = 8Ω, unless otherwise specified.)

A

V

R

DS(ON)

I

DD

No Load

Q

No Load 10 50 mV

OS

IDS = 0.5A

THD+N = 10%, f = 1kHz, Anti-saturation off

P

THD+N = 1%, f = 1kHz,

O

Anti-saturation off

f = 1kHz, Anti-saturation on

R

= 8Ω, PO = 0.85W, f = 1KHz

L

RL = 4Ω, PO = 1.75W, f = 1KHz

Input AC-GND, f = 1KHz, V

= 200mV, Gain =2V/V

PP

P

= 1W, f = 1KHz

O

f

OSC

200 250 300 kHz

P

= 1.7W, f =1 kHz, RL = 8Ω

O

PO = 3.0W, f =1 kHz, RL = 4Ω

V

P

Input AC-GND

N

No Load 2.5 V

OS

THD+N = 1%, RL = 32Ω, f = 1KHz

O

R

= 32Ω, PO = 10mW, f = 1kHz

L

Input AC-GND, f = 1kHz, V

P

= 1W, f = 1kHz

O

V

I

MUTE

I

SHDN

V

Input

N

AC-GND

f = 20 – 20kHz, V

TH

SH

SL

MH

ML

V

= 0V

MUTE

= 0V

SHDN

0.65

1.2

0.5

1.2

0.5

= 1V

O

P MOSFET 0.35

N MOSFET 0.25

R

= 8Ω

L

RL = 4Ω

R

= 8Ω

L

RL = 4Ω

= 8Ω

R

L

RL = 4Ω

A-Weighting 220

No A-Weighting 350

= 200mV

PP

A-Weighting 40

No A-Weighting 70

RMS

2.5 5.5 V

10 15 mA

1.55 1.70

2.85 3.00

1.10 1.35

2.3 2.5

1.0

2.0

0.08

-70 dB

-95 dB

85 89 %

80 83 %

60 mW

0.02 %

-75 dB

-85 dB

85 dB

1 3 mA

1 µA

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Ω

W

%

µV

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Typical Performance Characteristics (@T

Class-D Output

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PAM8603A

= +25°C, VDD = 5V, RL = 8Ω, GV = 24dB, unless otherwise specified.)

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PAM8603A

Document number: DSxxxxx Rev. 1 - 2

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