Datasheet PAM8902KER-P, PAM8902ZER-P Datasheet (Diodes) [ru]

A

f

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

Description

The PAM8902 is a mono, Class-D audio amplifier with integrated

boost converter designed for piezo and ceramic speakers.The

PAM8902 is capable of driving a ceramic/piezo speaker with

(10.6Vrms) from a 3.6V power supply.The PAM8902'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.

PAM8902 features an integrated audio low pass filter that rejects high

frequency noise thus improving audio fidelity. And three gain modes

of 18dB, 22dB and 26dB for ease of use. PAM8902 also provides

thermal, short, under- and over-voltage protection.

The PAM8902 is available in a 16-ball 1.95mm x 1.95mm CSP

package and 16-pin QFN4x4 package.

Features

Pin Assignments

Product Line o

Diodes Incorporated

PAM8902

 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 18dB, 22dB, and 26dB

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

 Low Shutdown Current: < 1µA

 Built-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

PAM8902

Document number: DSxxxxx Rev. 1 - 4

1 of 13

www.diodes.com

November 2012

© Diodes Incorporated

A

f

Typical Applications Circuit

Product Line o

Diodes Incorporated

PAM8902

Pin Descriptions

Pin

Name

Bump
(CSP)

PVCC A1 16
VOUT A2 1

SW A3 2

PGND1 A4 4

OUT+ B1 15
VSET B2 3

COMP B3 5

AVDD B4 6

OUT- C1 14

GSET C2 11

VCM C3 7

AGND C4 8

PGND2 D1 13

ENA D2 12

INN D3 10
INP D4 9

Pin Number

QFN4x4

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 ( 18dB , 22dB , 26dB)

Common Mode Bypass Cap

Analog Ground

ClassD Power Ground

Whole Chip Enable

Negative Differential Audio Input

Positive Differential Audio Input

PAM8902

Document number: DSxxxxx Rev. 1 - 4

2 of 13

www.diodes.com

November 2012

© Diodes Incorporated

A

f

Functional Block Diagram

Product Line o

Diodes Incorporated

PAM8902

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 350, 10sec

Recommended Operating Conditions (@T

Parameter Rating Unit

Supply Voltage Range 2.5 to 5.5 V

Ambient Temperature Range -40 to +85 °C

Junction Temperature Range -40 to +125 °C

PAM8902

Document number: DSxxxxx Rev. 1 - 4

= +25°C, unless otherwise specified.)

A

-0.3 to V

+0.3

DD

www.diodes.com

= +25°C, unless otherwise specified.)

A

3 of 13

V

°C

November 2012

© Diodes Incorporated

A

f

Product Line o

Diodes Incorporated

PAM8902

Thermal Information

Parameter Package Symbol Max Unit

Thermal Resistance (Junction to Ambient)

Thermal Resistance (Junction to Case)

CSP

QFN4x4-16 52

CSP

QFN4x4-16 30

θ

JA

θ

JC

Electrical Characteristics (@T

= +25°C, VDD = 3.6V, CL = 1µF, V

A

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

V

DD

I

Q

I

SD

T

WU

V

EH

V

EL

V

V

V

EN > 1.2V, V

EN > 1.2V, V

EN > 1.2V, V

EN = 0V 0.1 1 µA

EN from Low to High 40 mS

1.2

0.4

H

1

F

0 0.5

L

= High

SET

= Floating

SET

= GND

SET

Under Voltage Lockout Threshold UVLO VDD from High to Low 2.2

Under Voltage Lockout Hysteresis UVLO(H) VDD from Low to High 0.2

Thermal Shutdown Threshold OTP 150 °C

Thermal Shutdown Lockout Hysyeresis OTP(H) 30 °C

Boost Converter

V

Output Voltage

Current Limit

Lowside MOSFET R

DS(ON)

Boost Switching Frequency

1 V

O

VO2 V

VO3 V

C

L

RLS IO = 50mA

f

OSCB

= GND, No Load

SET

= NC, No Load

SET

= AVDD, No Load

SET

Average Input Current 0.8 A

1.1 1.5 1.9 MHz

Class D

Class D Amplifier Switching Frequency

f

OSCD

Common Mode Reject Ratio CMRR

Output Offset Voltage

R

DS(ON)

Closed-Loop Voltage Gain

V

OS

RP

A

V

AV2 G

AV3 G

Power Supply Reject Ratio PSRR

Total Harmonic Distortion Plus Noise THD+N

Input AC-GND 225 375 475 KHz

V

= + -100mV, VDD = 3.6V

IN

Output Offset Voltage 5 50 mV

High Side 1.5 Ω
Low Side 0.6 Ω

1 G

= AVDD, VO = 1V

SET

= NC, VO = 1V

SET

= GND, VO = 1V

SET

200m V

V

O

Supply Ripple @ 217Hz

PP

= 5VRMS

RMS

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

PAM8902

Document number: DSxxxxx Rev. 1 - 4

4 of 13

www.diodes.com

90

75

Float, unless otherwise specified.)

SET

°C/W

2.5 5.5 V

30 48

10 18

5 12

VDD -0.5

7.2 8 8.8 V

10.8 12 13.2 V

16 17.5 19 V

0.5 Ω

60 dB

RMS

RMS

25 26 27

21 22 23

17 18 19 dB

70 dB

0.3 %

mA

V

VDD

VDD -1

V

V

November 2012

© Diodes Incorporated

A

f

Typical Performance Characteristics

(@TA = +25°C, VDD = 4.2V, Gain = 26dB, CIN = 1µF, C

LOAD

Product Line o

Diodes Incorporated

PAM8902

= 1µF, unless otherwise specified.)

PAM8902

Document number: DSxxxxx Rev. 1 - 4

5 of 13

www.diodes.com

November 2012

© Diodes Incorporated

A

f

Typical Performance Characteristics (cont.) (@T

Product Line o

Diodes Incorporated

PAM8902

= +25°C, VDD = 5V, Gain = 18dB, unless otherwise specified.)

A

PAM8902

Document number: DSxxxxx Rev. 1 - 4

www.diodes.com

6 of 13

November 2012

© Diodes Incorporated

A

f

Product Line o

Diodes Incorporated

PAM8902

Application Information

Select Boost Converter Output Voltage

Customer can use V

Pin Configuration

V

SET

Connect to AVDD AVDD – 0.5 AVDD 17.5V

Floating 1V AVDD – 1V 12V

Connect to GND GND 0.5V 8V

Input Resistance (RI)

The input resistors (RI = RIN + REX) set the gain of the amplifier according to Equation 1 when anti-saturation is inactive.

Where R

is a 77.4KΩ internal resistor, REX is the external input resistor, RF is a 122.6KΩ internal resistor. Resistor matching is very important

IN

in fully differential amplifiers. The balance of the output on the reference voltage depends on matched ratios of the resistors. CMRR, PSRR, and

cancellation of the second harmonic distortion diminish if resistor mismatch occurs. Therefore, it is recommended to use 1% tolerance resistors

or better to keep the performance optimized. Matching is more important than overall tolerance. Resistor arrays with 1% matching can be used

with a tolerance greater than 1%. Place the input resistors very close to the PAM8902 to limit noise injection on the high-impedance nodes. For

optimal performance the gain should be set to lower. Lower gain allows the PAM8902 to operate at its best, and keeps a high voltage at the input

making the inputs less susceptible to noise. In addition to these features, higher value of R

Input Capacitors (CI)

In the typical application, an input capacitor, CI, is required to allow the amplifier to bias the input signal to the proper DC level for optimum

operation. In this case, Ci and the minimum input impedance R

equation:



F

It is important to consider the value of C

For example, when R

Equation is reconfigured as followed:



C

I

When input resistance variation is considered, the C

capacitor is the leakage path from the input source through the input network (C

voltage at the input to the amplifier that reduces useful headroom, especially in high gain applications. For this reason, a low-leakage tantalum or

ceramic capacitor is the best choice. When polarized capacitors are used, the positive side of the capacitor should face the amplifier input in

most applications as the DC level is held at V

capacitor polarity in the application.

PAM8902

Document number: DSxxxxx Rev. 1 - 4

pin to set boost converor output voltage between 8V, 12V and 17.5V. V

SET

Min Max PVCC Voltage

G = 20 Log [12.8*R

G

R

SET

G

= VDD

SET

G

= Floating

SET

G

= GND

SET

/ (RIN + REX)] (dB)

F

R

IN

77.4kΩ 122.6kΩ

100kΩ 100kΩ

122.6kΩ 77.4kΩ

form is a high-pass filter with the corner frequency determined in the follow

I

1

C

R2

IC

I

as it directly affects the low frequency performance of the circuit.

I

is 150k and the specification calls for a flat bass response are down to 150Hz.

I

1

R2

IFC



is 7nF, so one would likely choose a value of 10nF. A further consideration for this

I

, RI + RF) to the load. This leakage current creates a DC offset

I

/2, which is likely higher than the source DC level. Please note that it is important to confirm the

DD

7 of 13

www.diodes.com

pin configuration table as below:

SET

FB

minimizes pop noise.

I

Audio Amplifier

Maximum Output Voltage

11 V

(VPP = 31.1V)

RMS

8 V

(VPP = 22.6V)

RMS

5 V

(VPP = 14.1V)

RMS

November 2012

© Diodes Incorporated

A

f

Product Line o

Diodes Incorporated

PAM8902

Application Information

Decoupling Capacitor

The PAM8902 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to ensure the output total harmonic

distortion (THD) as low as possible. The optimum decoupling is achieved by using two different types of capacitors that target on different types

of noise on the power supply leads. For higher frequency transients, spikes, or digital hash on the line, a good low equivalent series-resistance

(ESR) ceramic capacitor, typically 1µF is placed as close as possible to the device AVDD pin for the best operation. For filtering lower frequency

noise signals, a large ceramic capacitor of 10µF or greater placed near the AVDD supply trace is recommended.

External Schottky Diode

Use external schottky diode can get the best driving capability and efficiency.

Since internal power diode has limited driving capability, only in following conditions customer can remove the external schottky diode to reduce

the cost.

1. VSET = GND or Floating and C

2. The signal frequency less than 4KHz.

3. Haptic application (50-500Hz)

Shutdown Operation

In order to reduce power consumption while not in use, the PAM8902 contains shutdown circuitry amplifier off when a logic low is placed on the

ENA pin. By switching the ENA pin connected to GND, the PAM8902 supply current draw will be minimized in idle mode.

Under-Voltage Lock-Out (UVLO)

The PAM8902 incorporates circuitry designed to detect supply voltage. When the supply voltage drops to 2.2V or below, the PAM8902 goes into

a state of shutdown, and the device comes out of its shutdown state and restore to normal function only when reset the power supply or ENA

pin.

Short-Circuit Protection (SCP)

The PAM8902 has short circuit protection circuitry on the outputs to prevent the device from damage when output-to-output shorted or output-to-

GND shorted occurs. When a short circuit occurs, the device goes into a latch state and must be reset by cycling the voltage on the ENA pin to a

logic low and then back to the logic high state for normal operation. This will clear the short-circuit flag and allow for normal operation if the short

was removed. If the short was not removed, the protection circuitry will again activate.

Over-Temperature Protection (OTP)

Thermal protection on the PAM8902 prevents the device from damage when the internal die temperature exceeds +150°C. There is a +15°C

tolerance on this trip point from device to device. Once the die temperature exceeds the set point, the device will enter the shutdown state and

the outputs are disabled in this condition both OUT+ and OUT- will become high impedance. This is not a latched fault. The thermal fault is

cleared once the temperature of the die decreased by +30°C. This large hysteresis will prevent motor boating sound well and the device begins

normal operation at this point with no external system interaction.

PAM8902

Document number: DSxxxxx Rev. 1 - 4

less than 1µF.

L

8 of 13

www.diodes.com

November 2012

© Diodes Incorporated

A

f

Ordering Information

Product Line o

Diodes Incorporated

PAM8902

Part Number Part Marking Package Type Standard Package

PAM8902ZER-P

PAM8902KER-P

BG
YW

P8902

XXXYW

CSP-16L 3000Units/Tape&Reel

QFN4x4-16L 3000Units/Tape&Reel

Marking Information

Y: Last Digital of Manufacturing Year

6: 2006

7: 2007

8: 2008

9: 2009

0: 2010

1: 2011

W: Week Code

Item Week Code Item Week Code Item Week Code Item Week Code

1 A 14 N 27 A 40 N
2 B 15 O 28 B 41 O
3 C 16 P 29 C 42 P
4 D 17 Q 30 D 43 Q
5 E 18 R 31 E 44 R
6 F 19 S 32 F 45 S
7 G 20 T 33 G 46 T
8 H 21 U 34 H 47 U

9 I 22 V 35 I 48 V
10 J 23 W 36 J 49 W
11 K 24 X 37 K 50 X
12 L 25 Y 38 L 51 Y
13 M 26 Z 39 M 52 Z

PAM8902

Document number: DSxxxxx Rev. 1 - 4

9 of 13

www.diodes.com

November 2012

© Diodes Incorporated

A

f

Marking Information (cont.)

Product Line o

Diodes Incorporated

PAM8902

PAM8902

Document number: DSxxxxx Rev. 1 - 4

10 of 13

www.diodes.com

November 2012

© Diodes Incorporated

A

f

Package Outline Dimensions (All dimensions in mm.)

CSP-16

Product Line o

Diodes Incorporated

PAM8902

PAM8902

Document number: DSxxxxx Rev. 1 - 4

11 of 13

www.diodes.com

November 2012

© Diodes Incorporated

A

f

Package Outline Dimensions (cont.) (All dimensions in mm.)

QFN4x4-16

Product Line o

Diodes Incorporated

PAM8902

PAM8902

Document number: DSxxxxx Rev. 1 - 4

12 of 13

www.diodes.com

November 2012

© Diodes Incorporated

A

f

Product Line o

Diodes Incorporated

PAM8902

DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.

Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.

Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.

This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.

Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:

A. Life support devices or systems are devices or systems which:

1. are intended to implant into the body, or

2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the

labeling can be reasonably expected to result in significant injury to the user.

B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.

Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.

Copyright © 2012, Diodes Incorporated

www.diodes.com

IMPORTANT NOTICE

LIFE SUPPORT

PAM8902

Document number: DSxxxxx Rev. 1 - 4

13 of 13

www.diodes.com

November 2012

© Diodes Incorporated