Diodes PAM8902A User Manual

A

f

Description

The PAM8902A is a mono, Class-D audio amplifier with integrated

boost convertor designed for piezo and ceramic speakers. The

PAM8902A is capable for driving a ceramic/piezo speaker with

(0.6Vrms) from a 3.6V power supply. The PAM8902A's boost

30V

PP

converter operates at a fixed frequency of 1.5MHz and provides a

17.5V supply with a minimum number of external components. The

three gain mode of 18dB, 22dB and 26dB is easy for using. PAM

unique ant i -saturat ion technology which detects output signal clip

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

automatically. PAM8902A features an integrated audio low pass filter

that rejects high frequency noise, thus improving audio fidelity.

PAM8902A also provides thermal, over current, under and over

voltage protection.

The PAM8902A is available in a 16-ball 1.95mm x 1.95mm CSP

package and 16-pin QFN4x4 package.

Product Line o

Diodes Incorporated

PAM8902A

30 VPP MONO CLASS-D AUDIO AMPLIFIER FOR

PIEZO/CERAMIC SPEAKERS WITH ANTI-SATURATION

Pin Assignments

Features

• Supply Voltage Range from 2.7V to 5.5V package.

• 30V

• Integrated Boost Converter Generates 17.5V Supply

• Programmable Soft-Start

• Unique Anti-Saturation Function

• Small Boost Converter Inductor

• Selectable Gain of 18dB, 22dB, and 26dB

• Selectable Boost output voltage of 8V, 12V, and 17.5V

• Low Shutdown Current: <1µA

• Build in Thermal, OCP, UVLO, OVP

• Available in Space Saving Packages:

Output Load Voltage from a 2.7V Supply

PP

(Refer to “Application Notes”)

 16-ball 1.95mm x 1.95mm CSP package

 16-pin QFN4x4 package

Applications

• Wireless or Cellular Handsets

• Portable DVD Player

• Personal Digital Assistants (PDAs )

• Electronic Dictionaries

• Digital Still Cameras

PAM8902A

Document number: DSxxxxx Rev. 1 - 3

1 of 12

www.diodes.com

February 2013

A

f

Typical Applications Circuit

Product Line o

Diodes Incorporated

PAM8902A

Pin Descriptions

Bump (CSP)

A1 13 PVCC Audio Amplifier Power Supply A2 1 VOUT Boost Convertor Output A3 2 SW Boost Convertor Switching Node A4 4 PGND1 Boost Convertor Power Ground B1 15 OUTP Positive Differential Audio Output B2 3 VSET Boost Convertor Output Voltage Setting(8V,12V,17.5V) B3 5 COMP Boost Convertor Compensation B4 6 AVDD Power Supply C1 14 OUTN Negative Differential Audio Output C2 11 GSET AmplifierGain Setting. (Refer to "Application Notes") C3 7 VCM Common Mode Bypass Cap C4 8 AGND Analog Ground D1 13 PGND2 Class D PowerGround D2 12 ENA Whole Chip Enable D3 10 INN Negative Differential Audio Input D4 9 INP Positive Differential Audio Input

Pin Number

(QFN)

Name

Function

PAM8902A

Document number: DSxxxxx Rev. 1 - 3

2 of 12

www.diodes.com

February 2013

A

f

Functional Block Diagram

Product Line o

Diodes Incorporated

PAM8902A

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 250, 10 sec

= +25°C, unless otherwise specified.)

A

-0.3 to V

DD

+0.3

V

°C

Recommended Operating Conditions (@T

= +25°C, unless otherwise specified.)

A

Parameter Rating Unit

Supply Voltage Range 2.7 to 5.5 V

Ambient Temperature Range -40 to +85 °C

Junction Temperature Range -40 to +125 °C

PAM8902A

Document number: DSxxxxx Rev. 1 - 3

3 of 12

www.diodes.com

February 2013

A

f

Product Line o

Diodes Incorporated

PAM8902A

Thermal Information

Parameter Package Symbol Max Unit

Thermal Resistance (Junction to Ambient)

Thermal Resistance (Junction to Case)

CSP

QFN4x4-16 37

CSP

QFN4x4-16 2



JA



JC

90 – 220

75

°C/W

Electrical Characteristics

(@TA = +25°C, VDD = 3.6V, CL = 1µF, V

Parameter Symbol Test Conditions Min Typ Max Units

Input Voltage

Quiescent Current

Shutdown Current

Wake-Up Time

Chip Enable

Chip Disable

GSET/ VSET High

GSET/ VSET Floating

GSET/ VSET Low

Under Voltage Lockout Threshold UVLO

Under Voltage Lockout Hysteresis UVLO(H)

Thermal Shutdown Threshold OTP 150 °C

Thermal Shutdown Lockout Hysyeresis OTP(H) 30 °C

Boost Converter

Output Voltage

Current Limit

Lowside MOSFET R

RLS IO = 50mA

DS(ON)

Boost Switching Frequency

Over Voltage Protection Threshold

Class D

Class D Amplifier Switching Frequency

Common Mode Reject Ratio CMRR

Output Offset Voltage

R

RP

DS(ON)

Closed-Loop Voltage Gain

Power Supply Reject Ratio PSRR

Total Harmonic Distortion Plus Noise THD+N

Signal to Noise Ratio SNR Input AC Ground, A-Weighting 90 dB

PAM8902A

Document number: DSxxxxx Rev. 1 - 3

floating, R

SET

LOAD

V

DD

I

Q

I

SD

T

WU

V

EH

V

EL

V

H

V

F

V

L

V

1 V

O

VO2 V

VO3 V

C

L

f

OSCB

V

OVP

f

OSCD

V

OS

1 G

A

V

AV2 G

AV3 G

= 10, L

EN > 1.2V, V

= 22µh with external schottky diodes, unless otherwise specified.)

LOAD

2.7 5.5 V

= High

SET

= Floating

SET

= GND

SET

30 48

10 18

5 12

mA

EN = 0V 0.1 1 µA

EN from Low to High 40 mS

1.2

0.4

VDD -0.5

1

VDD

VDD -1

V

0 0.5

V

from High to Low

DD

V

from Low to High

DD

= Low, No Load

SET

= Floating, No Load

SET

= High, No Load

SET

2.2

0.2

V

7.2 8.0 8.8 V

10.8 12.0 13.2 V

16.0 17.5 19.0 V

Average Input Current 0.8 A

0.5 

1.1 1.5 1.9 MHz

18 V

Input AC-GND 225 375 475 KHz

V

= ±100mV, VDD = 3.6V

IN

60 dB

Output Offset Voltage 5 50 mV

High Side 1.5  Low Side 0.6 

= High, VO = 1V

SET

= Floating, VO = 1V

SET

= Low, VO = 1V

SET

200m V

V

O

Supply Ripple @ 217Hz

PP

= 5VRMS

4 of 12

www.diodes.com

RMS

25 26 27

21 22 23

dB

17 18 19

70 dB

0.3 %

February 2013