Diodes PAM8001 User Manual

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ANTI-SATURATION FILTERLESS 2W CLASS-D STEREO AMPLIFIER

WITH DC VOLUME CONTROL AND MAX OUTPUT POWER SETTING

Description

The PAM8001 is a 2W, class-D audio amplifier. Advanced 64-step

DC volume control minimizes external components and allows

speaker volume control. PAM unique anti-saturation technology which

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

the output signal clip automatically. Also control the gain for set max

power. It can protect low wattage speaker from overdrive damage

even same platform with high wattage model. It offers low THD+N, to

produce high-quality 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

PAM8001 is much better than class-AB cousins. It can extend the

battery life thus be ideal for portable applications.

The PAM8001 is available in SSOP-24L and QFN3*3-20L package.

Features

Pin Assignments

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PAM8001

 2W Output at 1% THD with a 4Ω Load at 5V Power Supply

 Filterless, Low Quiescent Current and Low EMI

 Low THD+N

 64-Step DC Volume Control

 Unique Anti-Saturation Function

 Adjustable Max Output Power with No Clipping

 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

Applications

 LCD Monitors / TV Projectors

 Notebook Computers

 Portable Speakers

 Portable DVD Players, Game Machines

 VoIP/Speaker Phones

 All In One Computer /TV

PAM8001

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Typical Applications Circuit

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PAM8001

Pin Descriptions

Pin Number

QFN3x3 SSOP

1 4 -OUT_L Left Channel Negative Output

2 5 PVDDL Left Channel Power Supply

3 6 MUTE Mute Control Input (active low)

4 7 VDD Analog VDD

5 8 INL Left Channel Input

6 10 VDC Analog Reference for Gain Control Selection

7 11 VOLUME DC Volume Control to Set the Gain of Class-D

8 12 ANTI Anti-Saturation On/Off Control

9 14 VDD/2 Internal Common Mode Voltage, Connect a Bypass Capacitior form This Pin to GND

10 15 VPL Maximum Output Power Setting Voltage

11 16 VREF Reference Voltage Out for VPL

12 17 INR Right Channel Input

13 18 GND Analog Ground

14 19 SHDN Shutdown Control Input (active low)

15 20 PVDDR Right Channel Power Supply

16 21 -OUT_R Right Channel Negative Output

17 22/23 PGNDR Right Channel Power GND

18 24 +OUT_R Right Channel Positive Output

19 1 +OUT_L Left Channel Positive Output

20 2/3 PGNDL Left Channel Power GND

9/13 NC No Connection

PAM8001

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Pin

Name

Function

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Functional Block Diagram

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PAM8001

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 Junction Temperature -40 to +125

Storage Temperature -65 to +150

Soldering Temperature 300, 5sec

Recommended Operating Conditions (@T

Parameter Rating Unit

Supply Voltage Range 2.5 to 5.5 V

Junction Temperature Range -40 to +125

Ambient Operation Temperature Range -20 to +85

PAM8001

Document number: DSxxxxx Rev. 1 - 0

= +25°C, unless otherwise specified.)

A

-0.3 to V

+0.3

DD

= +25°C, unless otherwise specified.)

A

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V

°C

°C

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PAM8001

Thermal Information

Parameter Symbol Package Maximum Unit

Thermal Resistance (Junction to Ambient)

Thermal Resistance (Junction to Ambient)

θ

JA

θ

JA

Electrical Characteristics (V

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

DD

Symbol Parameter Conditions Min Typ Max Unit

VDD

IQ

VOS

R

DS(ON)

PO

PO

THD+N

PSRR Power Supply Ripple Rejection

CS Channel Separation

f

OSC

η Efficiency

Vn Noise

SNR Signal Noise Ratio f = 20-20kHz, Gain = 6dB 85 dB

UVLO Under Voltage Lock-Out 2.0 V

I

MUTE

I

SHDN

VSH

VSL

VMH

VML

VPL V

V

REF

ID V

OTP Over Temperature Protection 150 °C

OTH Over Temperature Hysteresis 30 °C

Note: 1. Maximum Output Power vs. VPL Voltage
V

VPL (V) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 >1.5

PO (W) 0 0.04 0.11 0.21 0.34 0.50 0.68 0.94 1.28 1.52 1.90 2.15 2.40 2.8

Supply Voltage Range 2.5 5.5 V

Quiescent Current No Load 11.5 15 mA

Output Offset Voltage

Drain-Source On-State
Resistance

Output Power with Anti­Saturation

Output Power without Anti­Saturation

Total Harmonic Distortion Plus
Noise

VIN = 0V

IDS = 0.5A

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

THD+N <10%
f = 1kHz, V

=8Ω, PO = 0.85W, f = 1kHz

R

L

RL = 4Ω, PO = 1.75W, f = 1kHz

Input AC-GND, f = 1KHz,
V

= 200mV, Gain = 6dB

PP

P

= 1W, f = 1KHz

O

Oscillator Frequency 200 250 300 kHz

P

= 1.7W, f = 1KHz, RL = 8Ω

O

PO = 3.0W, f = 1KHz, RL = 4Ω

Input AC-GND
Gain = 6dB

Mute Current

Shutdown Current

V

V

MUTE

SHDN

SHDN Input High 1.3

SHDN Input Low 0.65

MUTE Input High 1.3

MUTE Input Low 0.66

Threshold Voltage

PL

V

DD

Voltage VDD = 2.5V to 5.5V

REF

Drive Current VDD = 2.5V to 5.5V

REF

= 5V, RL = 4Ω, TA = +25°C

Power Limit Off 1.5 Note 1 V

SSOP-24L 96 °C/W

QFN3*3-20L 31 °C/W

20 mV

= 1V

PL

= 1.5V

PL

P MOSFET 0.21

N MOSFET 0.165

=8Ω

R

L

RL = 4Ω

=8Ω

R

L

RL = 4Ω

1

1.9

1.35 1.5

2.65 2.8

0.08

0.08

Ω

W

W

%

70 dB

-85 dB

85 89 %

80 83 %

= 0.3V

= 0V

A-Weighting 50

No A-Weighting 70

4.2 mA

1 µA

µV

V

V

1.2 V

150 µA

PAM8001

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Typical Operating Characteristics (@T

= +25°C, unless otherwise specified.)

A

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PAM8001

PAM8001

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Typical Operating Characteristics (cont.) (@T

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= +25°C, unless otherwise specified.)

A

PAM8001

PAM8001

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