Diodes PAM8304 User Manual

NEW PRODUCT

Description

The PAM8304 is a mono filter-less Class-D amplifier with high SNR and differential input that helps eliminate noise. The PAM8304 supports 2.8V to 6V operation make it idea for up to 4 cells alkaline battery applications. The PAM8304 is capable of driving speaker loads as low as 3Ω speaker with a 5V supply maximizing the output power.

Features like greater than 90% efficiency and small PCB area make the PAM8304 Class-D amplifier ideal for portable applications. The output uses a filter-less architecture minimizing the number of external components and PCB area whilst providing a high performance, simple and lower cost system.

The PAM8304 features short circuit protection, thermal shutdown and under voltage lock-out.

The PAM8304 is available in DFN3030-8L and MOP-8L packages.

Features

Supply Voltage from 2.8V to 6.0 V

3Ω Driving Capability

3.0W@10% THD Output with a 4Ω Load and 5V Supply

High Efficiency up to 90% @1W with an 8Ω Load

Shutdown Current <1μA

Superior Low Noise without Input

Short Circuit Protection

Thermal Shutdown

Available in Space Saving DFN3030-8L and MSOP-8L Packages

Pb-Free Package

A Product Line of

Diodes Incorporated

PAM8304

3W MONO CLASS D AUDIO AMPLIFIER

Pin Assignments

		DFN3X3-8L
		Top View
OUT+	1		8	OUT-
PVDD	2	P8304 XXXYW	7	GND
VDD 3			6	SD
IN-	4		5	IN+

MSOP-8L

Top View

OUT+ 1 8 OUT-

VDD	3	304P8 XXXYW	6	SD
PVDD	2		7	GND
IN-	4		5	IN+

Applications

MP4/MP3

GPS

Set-Top-Box

Tablets/Digital Photo Frame

Electronic Dictionary

Portable Game Machines

Typical Applications Circuit

V D D

1μ F

P V D D

V D D

V I N

0.1μ F

I N +

OU T+

0.1μ F

I N -

PA M 8 3 0 4

/ S D

/ S D

OU T-

P GN D

GN D

PAM8304	1 of 11	October 2013
Document number: DS36589 Rev. 1 - 2	www.diodes.com	© Diodes Incorporated

NEW PRODUCT

A Product Line of

Diodes Incorporated

PAM8304

Pin Descriptions

Pin Name	MSOP-8L/DFN3x3-8L	Function
OUT+	1	Positive BTL Output
PVDD	2	Power Supply
VDD	3	Analog Power Supply
IN-	4	Negative Differential Input
IN+	5	Positive Differential Input
/SD	6	Shutdown Terminal, Active Low
GND	7	Ground
OUT-	8	Negative BTL Output
Exposed Pad	—	NC

Functional Block Diagram

			VDD
IN+				Gate		PVDD
						OUT+
	-	PWM		Drive
	+	Modulator
IN-				Gate		OUT-
				Drive
SD	SD		UVLO		SC
				Protect
	Bias and	OSC	Startup	OTP		GND
	Vref		Protection

Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)

Parameter	Rating	Unit
Supply Voltage (VDD)	6.5	V
Input Voltage (IN+, IN-, /SD)	-0.3 to VDD +0.3	V
Storage Temperature	-65 to +150	°C
Maximum Junction Temperature	150	°C

Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)

Symbol	Parameter	Min	Max	Unit
VDD	Supply Voltage	2.8	6.0	V
TA	Operating Ambient Temperature Range	-40	+85	°C
TJ	Junction Temperature Range	-40	+125	°C

PAM8304	2 of 11	October 2013
Document number: DS36589 Rev. 1 - 2	www.diodes.com	© Diodes Incorporated

A Product Line of

Diodes Incorporated

PAM8304

Electrical Characteristics (@TA=25°C, VDD=5V, Gain=18dB, RL=L(33μH)+R+L(33μH), unless otherwise noted.)

NEW PRODUCT

Symbol	Parameter	Test Conditions		Min	Typ		Max	Unit
VDD	Supply Voltage			2.8		6.0		V
		THD+N = 10%, f = 1kHz,	VDD = 5.0V		3.0
			VDD = 3.6V		1.5			W
		R = 4Ω
			VDD = 3.2V		1.2
		THD+N = 1%, f = 1kHz,	VDD = 5.0V		2.4
			VDD = 3.6V		1.25			W
		R = 4Ω
Po	Output Power		VDD = 3.2V		1.0
		THD+N = 10%, f = 1kHz,	VDD = 5.0V		1.75
			VDD = 3.6V		0.90			W
		R = 8Ω
			VDD = 3.2V		0.70
		THD+N = 1%, f = 1kHz,	VDD = 5.0V		1.40
			VDD = 3.6V		0.72			W
		R = 8Ω
			VDD = 3.2V		0.60
		VDD = 5.0V, Po = 1W, R = 8Ω			0.17
	Total Harmonic	VDD = 3.6V, Po = 0.1W, R = 8Ω	f = 1kHz		0.16			%
		VDD = 3.2V, Po =0.1W, R = 8Ω			0.14
THD+N	Distortion Plus
		VDD = 5.0V, Po = 0.5W, R = 4Ω			0.14
	Noise
		VDD = 3.6V, Po = 0.2W, R = 4Ω	f = 1kHz		0.16			%
		VDD = 3.2V, Po = 0.1W, R = 4Ω			0.17
	Power Supply Ripple	VDD = 3.6V, Inputs ac-grounded	f=217Hz		-68
PSRR			f=1kHz		-70			dB
	Rejection	with C = 1μF
			f=10kHz		-67
Dyn	Dynamic Range	VDD = 5V,THD = %, R = 8Ω	f=1kHz		95			dB
			No A		170
Vn	Output Noise	Inputs ac-grounded	weighting					μV
			A-weighting		130
η	Efficiency	RL = 8Ω,THD = 10%	f=1kHz		93			%
		RL = 4Ω,THD = 10%			86
IQ	Quiescent Current	VDD = 5V	No Load		5			mA
Isd	Shutdown Current	VDD = 2.8V to 5V	/SD=0V			1		μA
Rdson	Static Drain-to Source On-	High Side PMOS,I = 500mA	VDD=5.0V		325			mΩ
	state Resistor	Low Side NMOS,I = 500mA	VDD=5.0V		200			mΩ
fsw	Switching Frequency	VDD = 2.8V to 5V			400			kHz
Gv	Closed-loop Gain	VDD = 2.8V to 5V			300K/Rin			V/V
Vos	Output Offset Voltage	Input ac-ground, VDD = 5V				50		mV
VIH	SD Input High Voltage	VDD = 5V		1.4				V
VIL	SD Input Low Voltage	VDD = 5V				1.0

PAM8304	3 of 11	October 2013
Document number: DS36589 Rev. 1 - 2	www.diodes.com	© Diodes Incorporated

A Product Line of

Diodes Incorporated

															PAM8304
		Performance Characteristics (@TA=25°C, VDD=5V, Gain=18dB, RL=L(33μH)+R+L(33μH), unless otherwise noted.)
			THD+N Vs. Output Power (RL=4Ω)								THD+N Vs. Output Power (RL=8Ω)
		2 0								2 0
	PRODUCT	1 0								1 0
		5			VDD=5.0V					5				VDD=5.0V
		2								2				VDD=3.6V
		%			VDD=3.6V					%
		1								1
		0 .5								0 .5
	NEW	0 .2								0 .2
		0 .1								0 .1
		1 m	2 m	5 m 1 0m 2 0 m	5 0 m 10 0 m 2 00 m	5 0 0m	1	2	5
										1 m	2 m	5 m	1 0 m 2 0 m	50 m 1 0 0 m 2 0 0 m	500m	1	2 3
					W
														W

THD+N Vs. Frequency

	1 0
	Po=300mW
	5
	2				VDD=5.0V
	1
%	0 . 5			VDD=3.6V
	0 . 2
	0 . 1
	0 . 0 5
	0 . 0 22 0	5 0	1 0 0	2 0 0	5 0 0	1 k	2 k	5 k	1 0 k	2 0 k
					H z

PSRR Vs. Frequency

	+0	T
	-5
	-10	VDD=5.0V
	-15
	-20
	-25
	-30
	-35
d	-40
B
	-45
	-50
	-55
	-60
	-65
	-70
	-75
	-80	50	100	200	500	1k	2k	5k	10k	20k
	20
					Hz

Frequency Response

	+ 2 0
	+ 1 9 .	5
	+ 1 9
	+ 1 8 .	5
	+ 1 8
	+ 1 7 .	5
	+ 1 7
	+ 1 6 .	5
	+ 1 6
d	+ 1 5 .	5
B
	+ 1 5
g
A	+ 1 4 .	5
	+ 1 4
	+ 1 3 .	5
	+ 1 3
	+ 1 2 .	5
	+ 1 2
	+ 1 1 .	5							VDD=5.0V
	+ 1 1
	+ 1 0 .	5
	+ 1 02 0		5 0	1 0 0	2 00	5 0 0	1 k	2k	5 k	10 k	2 0k
							H z

Noise Floor

	+ 20
	+ 10	VDD=5.0V
	+ 0
	-10
	-20
	-30
d	-40
B	-50
r
A	-60
	-70
	-80
	-90
	-100
	-110
	-12020	50	100	200	500	1k	2k	5k	10k	20k
						Hz

PAM8304	4 of 11	October 2013
Document number: DS36589 Rev. 1 - 2	www.diodes.com	© Diodes Incorporated