Diodes PAM8902H User Manual

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30 VPP MONO CLASS-D AUDIO AMPLIFIER FOR PIEZO/CERAMIC SPEAKERS

Description

The PAM8902H is a mono, Class-D audio amplifier with integrated boost convertor designed for piezo and ceramic speakers.The PAM8902H is capable of driving a ceramic/ piezo speaker with 30Vpp(10.6Vrms) from a 3.6V power supply.The PAM8902H's Boost converter operates at a fixed frequency of 1.5MHz , and provides a

17.5V supply with a minimum number of external components. PAM8902H features an integrated audio low pass filter that rejects high frequency noise thus improving audio fidelity. And three gain modes of 21dB, 26dB and 32.5dB easy for using.PAM8902H also provides thermal ,short, under and over voltage protection.

The PAM8902H is available in a 16-ball 1.95mm x 1.95mm CSP package and 16-pin QFN4x4 package.

Features

Pin Assignments

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PAM8902H

• Supply Voltage Range From 2.5V to 5.5V

• 30 V

• Integrated Boost Converter Generates 17.5V Supply

• Programmable Soft-Start

• Small Boost Converter Inductor

• Selectable Gain of 21dB, 26dB, and 32.5dB

• Selectable Boost Output Voltage of 8V, 12V, and 17.5V

• Low Shutdown Current: <1µA

• Build in Thermal , OCP ,OVP,Short Protection

• Available in Space Saving Packages:

Output Load Voltage From a 2.5V Supply

PP

 16-ball 1.95mmx1.95mm CSP Package  16-pin QFN4x4 Package

Applications

 Wireless or Cellular Handsets  Portable DVD Player  Personal Digital Assistants (PDAs )  Electronic Dictionaries  Digital Still Cameras

PAM8902H

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Typical Applications Circuit

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PAM8902H

Pin Descriptions

Pin Name Bump (CSP) Pin Number (QFN) Function

PVCC A1 16 Audio Amplifier Power Supply VOUT A2 1 Boost Convertor Output

SW A3 2 Boost Convertor Switching Node

PGND1 A4 4 Boost Convertor Power Ground

OUT+ B1 15 Positive Differential Audio Output VSET B2 3 Boost Convertor Output Voltage Setting (8V,12V,17.5V)

COMP B3 5 Boost Convertor compensation

AVDD B4 6 Power Supply

OUT- C1 14 Negative Differential Audio Output

GSET C2 11 Amplifier Gain setting ( 21dB , 26dB , 32.5dB)

VCM C3 7 Common Mode bypass Cap

AGND C4 8 Analog Ground

PGND2 D1 13 Class D Power Ground

ENA D2 12 Whole chip Enable

INN D3 10 Negative Differential Audio Input INP D4 9 Positive Differential Audio Input

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Functional Block Diagram

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PAM8902H

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 Storage Temperature -65 to 150 Maximum Junction Temperature 150 Soldering Temperature 250, 10sec

Recommended Operating Conditions (@T

Parameter Rating Unit

Supply Voltage Range 2.5 to 5.5 V Ambiient Temperature Range -40 to +85 Junction Temperature Range -40 to +125

PAM8902H

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= +25°C, unless otherwise specified.)

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-0.3 to V

DD

+0.3

= +25°C, unless otherwise specified.)

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°C

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PAM8902H

Thermal Information

Parameter Symbol Package Maximum Unit

Thermal Resistance

(Junction to Ambient)

Thermal Resistance

(Junction to Case)

θ

JA

θ

JC

Electrical Characteristics (@T

= +25°C, VDD = 3.6V, CL = 1µF, V

A

Symbol Parameter Conditions Min Typ Max Unit

VDD

IQ

ISD TWU VEH VEL

VH

VF VL

UVLO Under Voltage Lockout Threshold

UVLOH

OTP Thermal Shutdown Threshold 150 °C

OTPH

Boost Converter

VO1 VO2 VO3

CL

RLS Low Side MOSFET R

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OSCB

Class-D

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OSCD

CMRR Common Mode Reject Ratio

VOS

RP R AV1

AV2 G AV3 G

PSRR Power Supply Reject Ratio

THD+N Total Harmonice Distortion Plus Noise

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

Input Voltage 2.5 5.5 V

EN > 1.2V, VSET = High 30 48

Quiescent Current

EN > 1.2V, VSET = Floating 10 18

EN > 1.2V, VSET = GND 5 12 Shutdown Current EN = 0V 0.1 1.0 µA Wake-Up Time EN From Low to High 40 mS Chip Enable 1.2 Chip Disable 0.4 GSET/VSET High GSET/VSET Floating 1 GSET/VSET Low 0 0.5

V

DD

Under Voltage Lockout Hysteresis

VDD From Low to High

Thermal Shutdown Lockout Hysteresis 30 °C

VSET = GND, No Load 7.2 8.0 8.8 V Output Voltage

VSET = NC, No Load 10.8 12.0 13.2 V

VSET = AVDD, No Load 16 17.5 19 V Current Limit Average Input Current 1.0 A

I

DS(ON)

Boost Switching Frequency 1.1 1.5 1.9 MHz

Class-D Amplifier Switching Frequency Input AC-GND 225 375 475 KHz

= 50mA

O

V

IN

Output Offset Voltage Output Offset Voltage 5 50 mV

DS(ON)

Closed-Loop Voltage Gain

High Side 1.5 Ω

Low Side 0.6 Ω

G

SET SET SET

200m V

V

O

CSP 90

QFN4x4-16 52

CSP 72

QFN4x4-16 30

Float, unless otherwise specified.)

SET

VDD -0.5

From High to Low

2.2

0.2

0.5 Ω

= ±100mV, VDD = 3.6V

= AVDD, VO = 1V = AVDD, VO = 1V = AVDD, VO = 1V

Supply Ripple @ 217Hz

PP

= 5V

RMS

RMS RMS RMS

60 dB

32.5 26 21 70 dB

0.3 %

°C/W

mA

V

VDD

VDD -1

V

dB

PAM8902H

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