A Product Line of
Diodes Incorporated
NOT RECOMMENDED FOR NEW DESIGN
USE
PAM8902H
PAM8902A
30-V
PP
MONO CLASS-D AUDIO AMPLIFIER
for PIEZO/CERAMIC SPEAKERS with ANTI-SATURATION/CLIPPING
Description
The PAM8902A is a mono, Class-D audio amplifier with integrated
boost converter designed for piezo and ceramic speakers. The
PAM8902A is capable for driving a ceramic/piezo speaker with 30V
PP
(10.6V
RMS
) from a 3.6V power supply. The boost converter operates
at a fixed frequency of 1.5MHz and provides a 17.5V supply with a
minimum number of external components.
The PAM8902A provide three fixed-gain settings of 18dB, 22dB, and
26dB. PAM's anti-saturation technology detects if the input has been
over-driven and automatically decreases the gain to prevent the
output signal from clipping. To improve fidelity, an integrated low-
pass filter rejects any high-frequency noise. The PAM8902A also
includes thermal, current limiting, under-voltage lockout, and over-
voltage protection circuitry.
Package options include a 1.95mm x 1.95mm CSP and a 4mm x
4mm QFN.
Pin Assignments
Features
Supply Voltage Range from 2.7V to 5.5V
30V
PP
Boost Converter Output Voltage from a 3.6V Supply
Selectable Boost Output Voltage of 8V, 12V, and 17.5V
Integrated Boost Converter Generates 17.5V Supply
Programmable Soft-Start
Anti-Saturation Function Eliminates Clipping
Selectable Gain of 18dB, 22dB, and 26dB
Low Shutdown Current: < 1µA
Build in Thermal, Over-Current Protection, Under-Voltage Lock-
Out and Over Voltage Protection
Available in Space Saving CSP and QFN4x4 Packages
Applications
Wireless or Cellular Handsets
Portable DVD Player
Personal Digital Assistants (PDAs)
Electronic Dictionaries
Digital Still Cameras
PAM8902A
Document number: DS36452 Rev. 2 - 3
1 of 12
www.diodes.com
October 2016
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM8902A
Typical Applications Circuit
Pin Descriptions
Pin
Name
PVCC
VOUT
SW
PGND1
OUTP
VSET
COMP
AVDD
OUTN
GSET
VCM
AGND
PGND2
ENA
INN
INP
Bump
(CSP)
A1
A2
A3
A4
B1
B2
B3
B4
C1
C2
C3
C4
D1
D2
D3
D4
Pin Number
QFN4x4
16
1
2
4
15
3
5
6
14
11
7
8
13
12
10
9
Function
Audio Amplifier Power Supply
Boost Converter Output
Boost Converter Switching Node
Boost Converter Power Ground
Positive Differential Audio Output
Boost Converter Output Voltage Setting(8V,12V,17.5V)
Boost Converter Compensation
Power Supply
Negative Differential Audio Output
Amplifier Gain Setting (Refer to “Application Information”)
Common Mode Bypass Cap
Analog Ground
Class D Power Ground
Whole Chip Enable
Negative Differential Audio Input
Positive Differential Audio Input
PAM8902A
Document number: DS36452 Rev. 2 - 3
2 of 12
www.diodes.com
October 2016
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM8902A
Functional Block Diagram
Absolute Maximum Ratings
(@T
A
= +25°C, unless otherwise specified.)
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
Supply Voltage
Input Voltage
Maximum Junction Temperature
Storage Temperature
Soldering Temperature
Rating
6.0
-0.3 to V
DD
+0.3
+150
-65 to +150
250, 10 sec
Unit
V
°C
Recommended Operating Conditions
(@T
A
= +25°C, unless otherwise specified.)
Parameter
Supply Voltage Range
Ambient Temperature Range
Junction Temperature Range
Rating
2.5 to 5.5
-40 to +85
-40 to +125
Unit
V
°C
°C
PAM8902A
Document number: DS36452 Rev. 2 - 3
3 of 12
www.diodes.com
October 2016
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM8902A
Thermal Information
Parameter
Thermal Resistance (Junction to Ambient)
Thermal Resistance (Junction to Case)
Package
CSP
QFN4x4-16
CSP
QFN4x4-16
Symbol
θ
JA
θ
JC
Max
90 – 220
37
75
2
Unit
°C/W
Electrical Characteristics
Parameter
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
Under Voltage Lockout Hysteresis
Thermal Shutdown Threshold
Thermal Shutdown Lockout Hysyeresis
Boost Converter
Output Voltage
Current Limit
Lowside MOSFET R
DS(ON)
Boost Switching Frequency
Over Voltage Protection Threshold
Class D
Class D Amplifier Switching Frequency
Common Mode Reject Ratio
Output Offset Voltage
R
DS(ON)
(@T
A
= +25°C, V
DD
= 3.6V, C
L
= 1µF, V
SET
floating, unless otherwise specified.)
Symbol
V
DD
EN > 1.2V, V
SET
= High
I
Q
I
SD
T
WU
V
EH
V
EL
V
H
V
F
V
L
UVLO
UVLO(H)
OTP
OTP(H)
V
O
1
V
O
2
V
O
3
C
L
R
LS
f
OSCB
V
OVP
f
OSCD
CMRR
V
OS
R
P
A
V
1
Input AC-GND
V
IN
= ±100mV, V
DD
= 3.6V
Output Offset Voltage
High Side
Low Side
G
SET
= High, V
O
= 1V
RMS
G
SET
= Floating, V
O
= 1V
RMS
G
SET
= Low, V
O
= 1V
RMS
200m V
PP
Supply Ripple @ 217Hz
V
O
= 5VRMS
Input AC Ground, A-Weighting
25
21
17
225
V
SET
= Low, No Load
V
SET
= Floating, No Load
V
SET
= High, No Load
Average Input Current
I
O
= 50mA
1.1
7.2
10.8
16.0
V
DD
from High to Low
V
DD
from Low to High
V
DD
-0.5
1
0
2.2
0.2
150
30
8.0
12.0
17.5
0.8
0.5
1.5
18
375
60
5
1.5
0.6
26
22
18
70
0.3
90
27
23
19
dB
%
dB
dB
50
475
1.9
8.8
13.2
19.0
EN > 1.2V, V
SET
= Floating
EN > 1.2V, V
SET
= GND
EN = 0V
EN from Low to High
1.2
0.4
V
DD
V
DD
-1
0.5
V
°C
°C
V
V
V
A
Ω
MHz
V
KHz
dB
mV
Ω
Ω
V
Test Conditions
Min
2.7
30
10
5
0.1
40
Typ
Max
5.5
48
18
12
1
µA
mS
V
mA
Units
V
Closed-Loop Voltage Gain
Power Supply Reject Ratio
Total Harmonic Distortion Plus Noise
Signal to Noise Ratio
A
V
2
A
V
3
PSRR
THD+N
SNR
PAM8902A
Document number: DS36452 Rev. 2 - 3
4 of 12
www.diodes.com
October 2016
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM8902A
Typical Performance Characteristics
(@T
A
= +25°C, V
DD
= 3.6V, CL = 1µF, L = 4.7µH, V
SET
floating, R
LOAD
= 10Ω,
L
LOAD
= 22µH with external schottky diode, unless otherwise specified.)
PAM8902A
Document number: DS36452 Rev. 2 - 3
5 of 12
www.diodes.com
October 2016
© Diodes Incorporated
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