PowTech PT5326 Schematics

PT5326

Filter-free Class-D Audio Power Amplifier

GENERAL DESCRIPTION

The PT5326 is a dual 2.0W high efficiency filterless
class D audio power amplifier in a 4mm×4mm QFN-16
and SMD-16 or SOP16 package that requires only five
external components.

The PT5326 uses Class D architecture, the device
delivers up to 2.0W while offering up to 80%
efficiency.
The PT5326 offers a spread-spectrum PWM
modulation scheme that reduces EMI-radiated
emissions due to the modulation frequency. The device
utilizes a fully differential architecture, a full bridged
output, and comprehensive click-and-pop suppression.
The PT5326 features high 60dB PSRR, low 0.11%
THD+N. Output short-circuit and thermal-overload
protection prevents the device from being damaged
during a fault condition.
The PT5326 is ideal for cellular handsets and PDA

applications.

2.0 W/CH Ster eo

FEATURES

z 2.0 W/Ch into 4  at 5 V , THD<10%
z Selectable Gain of 6, 12, 18, and 24 dB
z 6mA Quiescent Current
z 0.5µA Shutdown Current
z Spread-Spectrum PWM Modulation
z Only Three External Components
z Output short-Circuit and Thermal Protection
z Space Saving Packages: SMD16 QFN16,SOP16

APPLICATIONS

z Wireless or Cellular Handsets
z Portable DVD
z Notebook PC
z Portable Radio
z Portable Gaming
z Educational Toys
z USB Speakers

TYPICAL APPLICATION CIRCUIT

INL

INR

Shutdown

Control

C

INL1

C

INL2

C

INR1

C

INR2

INL +

INL -

INR +

INR -

SDL

PT5326

SDR

PIN ASSIGNMENT

G0

PVDD

AVDD

PGND

AGND

OUTL+

OUTL-

OUTR+

OULR-

G1

Gain

Control

To Battery

C

10uF

note4

S

SOP16 (Top View)

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PT5326_DS Rev EN_1.2

PT5326

-

+

2.0 W/CH Ster eo

Filter-free Class-D Audio Power Amplifier

A1 A2 A3

PVDD

OUTR

-

AGND

SDR

AVDD

PGND

OULR

12

11

13

14

15

16

1

2

G0

INR+

QFN16 (4x4 mm) Top View

10

3

INR-

OUTL+

9

8

OUTL

7

SDL

6

G1

INL+

5

4

INL-

B1

C1

D1

INL+ PVDD OUTL+

INL- G1 SDR

INR-

INR+ AVDD OUTR+

SMD16 Top View

G0

A4

OUTL-

SDL

AGND

PGND

OUTR

-

PIN DESCRIPTIONS

QFN16 SMD16 SOP16 NAME DESCRIPTION

1 D1 3 INR+ Right channel positive input

3 C1 5 INR- Right channel negative input

5 A1 7 INL+ Left channel positive input

4 B1 6 INL- Left channel negative input

15 B3 16

7 B4 9

2 C2 4 G0 Gain select (LSB)

6 B2 8 G1 Gain select (MSB)

10 A2 12 PVDD Power supply (Must be same voltage as AVDD)

16 D2 2 AVDD Analog supply (Must be same voltage as PVDD)

11 C4 13 PGND Power ground

14 C3 1 AGND Analog ground

13 D3 15 OUTR+ Right channel positive differential output

12 D4 14 OUTR- Right channel negative differential output

8 A3 10 OUTL+ Left channel positive differential output

9 A4 11 OUTL- Left channel negative differential output

SDR

SDL

Thermal Pad

Right channel shutdown terminal (shutdown at

low)

Left channel shutdown terminal (shutdown at low)

Connect the thermal pad of QFN package to PCB

GND

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PT5326_DS Rev EN_1.2

PT5326

PAD ASSIGNMENT

B1

D1 D2

E1 E2

F1 F2

Filter-free Class-D Audio Power Amplifier

A1 A2

B2 B3 B4

C1 C2

D3 D4

G1 G2

G3

G4 G5

2.0 W/CH Ster eo

E3

PAD DESCRIPTIONS

PADS NAMES POSITION DESCRIPTION

A1, A2 PGND (-198,883), (-118,883) Power ground

B1, B2 OUTR- (-845,743), (-765,743) Right channel negative differential output

B3, B4 OUTL- (765,743), (845,743) Left channel negative differential output

C1, C2 PVDD (-180,473), (-100,473) Power supply (Must be same voltage as AVDD)

D1, D2 OUTR+ (-845,280), (-765,280) Right channel positive differential output

D3, D4 OUTL+ (765,280), (845,280) Left channel positive differential output

E1

SDR

E2 AGND (-591,-20) Analog ground

E3

SDL

F1 AVDD (-863,-544) Analog supply (Must be same voltage as PVDD)

F2 G1 (863,-536) Gain select (MSB)

G1 INR+ (-642,-863) Right channel positive input

G2 G0 (-532,-863) Gain select (LSB)

G3 INR- (-173,-863) Right channel negative input

G4 INL- (540,-863) Left channel negative input

G5 INL+ (657,-863) Left channel positive input

(-862,-21) Right channel shutdown terminal

(High = Enable, Low = Shutdown)

(862,-21) Left channel shutdown terminal

( High = Enable, Low = Shutdown )

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PT5326_DS Rev EN_1.2

PT5326

Filter-free Class-D Audio Power Amplifier

ABSOLUTE MAXIMUM RATINGS (NOTE1)

SYMBOL PARAMETER VALUE UNIT

VDD Supply Voltage -0.3 ~ 6.0 V

VIN Input Voltage -0.3 ~ VDD+0.3 V

T

Storage Temperature -65 ~ +150

STG

P

Continuous Power Dissipation (Note2) Internally Limited W

DMAX

TJ Operating Junction Temperature -40 ~ +150

PTR1 Thermal Resistance, SMD16: JA 100

PTR2 Thermal Resistance, QFN16(4x4): JA 60 oC / W

PTR3 Thermal Resistance, SOP16: JA 90

T

Solder Temperature 235

Solder

ESD Susceptibility (Note 3) 2 KV

RECOMMENDED OPERATING RANGE

SYMBOL PARAMETER VAL UE UNIT

VDD Supply voltage AVDD, PVDD 2.5~5 V

VIH High-level input voltage

VIL Low-level input voltage

TA Operating free-air temperature -40 ~85 °C

SDL, SDR
SDL, SDR

, G0, G1

, G0, G1

2.0 W/CH Ster eo

o

C

o

C

o

C / W

o

C / W

o

C

1.4~V

V

DD

0~0.4 V

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Recommended

Operating Range indicates conditions for which the device is functional, but do not guarantee specific performance

limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which

guarantee specific performance limits. This assumes that the device is within the Operating Range. Specifications are

not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device

performance.

Note 2: The maximum power dissipation must be derated at elevated temperatures and is dictated by T

the ambient temperature T

A. The maximum allowable power dissipation is PDMAX = (TJMAX - TA)/ JA or the number

JMAX, JA, and

given in Absolute Maximum Ratings, whichever is lower.

Note 3: Human body model, 100pF discharged through a 1.5k resistor.
Note 4: Bypass capacitor Cs can’t be smaller than 10uF and closes to the chip to prevent the vdd’s glitch from

exceeding 6.5V. Selecting 0805 or larger volume package type’s capacitor is preferable.

ELECTRICAL CHARACTERISTICS

SYMBOL PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

|VOS|

Output offset voltage
(measured differentially)

IQ Supply current

ISD Shutdown current 1.5 µA

Inputs ac grounded, AV = 6dB,
V

= 2.5 to 5.5V

DD

5 25 mV

VDD = 5.5V, No load 6 9

VDD = 3.6V, No load 5 7.5

V

= 2.5V, No load 4 6

DD

mA

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PT5326_DS Rev EN_1.2

PT5326

2.0 W/CH Ster eo

Filter-free Class-D Audio Power Amplifier

ELECTRICAL CHARACTERISTICS (continued)

SYMBOL PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

R

DS(on)

Static drain-source

on-state resistance

fSW Switching frequency VDD = 2.5V to 5.5V 400 500 600 kHz

PO

THD+N

Closed-loop voltage

gain

Output power

(per channel)

Total harmonic

distortion plus noise

Xtalk Channel crosstalk PO = 0.5 W, f = 1 kHz -70 dB

PSRR

CMRR

Supply ripple

rejection ratio

Common mode

rejection ratio

Input impedance

Start-up time from

shutdown

SNR Signal to Noise Ratio VDD = 5V, PO = 1W 90 dB

en Output voltage noise

VDD = 2.5V 700

VDD = 3.6V 570

= 5.5V 500

V

DD

G0, G1 = 0.35V 5.5 6 6.5

G0 = VDD, G1 = 0.35V 11.5 12 12.5

G0 = 0.35V, G1 = VDD 17.5 18 18.5

G0, G1 = V

RL = 8

= 4

R

L

PO = 1W, VDD = 5V, AV = 6dB,

f = 1kHz

= 0.5W, VDD = 5V, AV = 6dB,

P

O

f = 1kHz

23.5 24 24.5

DD

VDD = 5.0V, f = 1kHz,

THD = 10%

V

= 3.6V, f = 1kHz,

DD

THD = 10%

= 5.0V, f = 1kHz,

V

DD

THD = 10%

1.5

0.8

2.0

0.14

%

0.11

%

VDD = 5V, AV = 6dB, f = 217Hz -60

= 3.6V, AV = 6dB, f = 217Hz -60

V

DD

= 3.6V, VIC = 1Vpp,

V

DD

f = 217Hz

-60 dB

Av = 6dB 28.2

Av = 12dB 17.76

Av = 18dB 11.15

Av = 24dB 5.89

= 3.6V 1.5 ms

V

DD

= 3.6V, f =

V

DD

20 to 20 kHz,

No weighting 80

Inputs are ac

grounded, AV =

A weighting 50

6dB

m

dB

W

dB

k

µV

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PT5326_DS Rev EN_1.2

PT5326

Filter-free Class-D Audio Power Amplifier

TYPICAL PERFORMANCE CHARACTERISTICS

CMRR vs Freqency

+0

-10

-20

-30

-40

-50

CMRR (dB)

-60

-70

-

80

+0

-10

-20

-30

-40

-50

CMRR (dB)

-60

-70

-

80

20 20k50 100 200 500 1k 2k 5k 10k

+0

-10

-20

-30

-40

-50

Crosstalk (dB)

-60

-70

-

80

20 20k50 100 200 500 1k 2k 5k 10k

VDD=5 V
R

=8 ohm

L

A

=6 dB

V

20 20k50 100 200 500 1k 2k 5k 10k

Frequency (Hz)

CMRR vs Freqency

VDD=3.6 V
R

=8 ohm

L

A

=6 dB

V

Frequency (Hz)

Crosstalk vs Frequency

V

= 5 V

DD

R

= 8 ohm

L

A

= 6 dB

V

R to L

L to R

Frequency (Hz)

+0

-10

-20

-30

-40

-50

CMRR (dB)

-60

-70

-

80

+0

-10

-20

-30

-40

-50

Crosstalk (dB)

-60

-70

-

80

+0

-10

-20

-30

-40

-50

Crosstalk (dB)

-60

-70

-

80

20 20k50 100 200 500 1k 2k 5k 10k

R to L

20 20k50 100 200 500 1k 2k 5k 10k

20 20k50 100 200 500 1k 2k 5k 10k

CMRR vs Freqency

VDD=2.5 V
R

=8 ohm

L

A

=6 dB

V

Frequency (Hz)

Crosstalk vs Frequency

V

= 5 V

DD

R

= 4 ohm

L

A

= 6 dB

V

L to R

Frequency (Hz)

Crosstalk vs Frequency

V

= 2.5 V

DD

= 4 ohm

R

L

A

= 6 dB

V

L to R

Frequency (Hz)

2.0 W/CH Ster eo

R to L

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PT5326_DS Rev EN_1.2