ON Semiconductor NCP2820 Technical data

NCP2820

2.65 W Filterless Class−D Audio Power Amplifier

The NCP2820 is a cost−effective mono Class−D audio power

amplifier capable of delivering 2.65 W of continuous average power to 4.0  from a 5.0 V supply in a Bridge Tied Load (BTL) configuration. Under the same conditions, the output power stage can provide 1.4 W to a 8.0  BTL load with less than 1% THD+N. For cellular handsets or PDAs it offers space and cost savings because no output filter is required when using inductive tranducers. With more than 90% efficiency and very low shutdown current, it increases the lifetime of your battery and drastically lowers the junction temperature.

The NCP2820 processes analog inputs with a pulse width modulation technique that lowers output noise and THD when compared to a conventional sigma−delta modulator. The device allows independent gain while summing signals from various audio sources. Thus, in cellular handsets, the earpiece, the loudspeaker and even the melody ringer can be driven with a single NCP2820. Due to its low 42V noise floor, A−weighted, a clean listening is guaranteed no matter the load sensitivity.

Features

• Optimized PWM Output Stage: Filterless Capability

• Efficiency up to 90%

Low 2.5 mA Typical Quiescent Current

• Large Output Power Capability: 1.4 W with 8.0  Load (CSP) and

THD + N < 1%

• Wide Supply Voltage Range: 2.5−5.5 V Operating Voltage

• High Performance, THD+N of 0.03% @ V

R

= 8.0 , P

L

= 100 mW

out

• Excellent PSRR (−65 dB): No Need for Voltage Regulation

• Surface Mounted Package 9−Pin Flip−Chip CSPand UDFN8

• Fully Differential Design. Eliminates Two Input Coupling Capacitors

• Very Fast Turn On/Off Times with Advanced Rising and Falling

Gain Technique

• External Gain Configuration Capability

• Internally Generated 250 kHz Switching Frequency

• Short Circuit Protection Circuitry

• “Pop and Click” Noise Protection Circuitry

• Pb−Free Packages are Available

Applications

• Cellular Phone

• Portable Electronic Devices

• PDAs and Smart Phones

• Portable Computer

= 5.0 V,

p

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MARKING

DIAGRAMS

AYWW

C1

ZB MG

A3

MAQG

Cs

1

9−PIN FLIP−CHIP CSP

1

FC SUFFIX

CASE 499AL

8

1

8 PIN UDFN 2x2.2

MU SUFFIX

CASE 506AV

A = Assembly Location Y = Year WW = Work Week M = Date Code G = Pb−Free Package

ORDERING INFORMATION

See detailed ordering and shipping information on page 20 of this data sheet.

Audio

Input

from

DAC

Microcontroller

1.6 mm

R

Input from

R

i

INP

i

INM

SD

GND

i

3.7 mm

A1

1

VP

OUTM

OUTP

Cs

November, 2006 − Rev. 5

1 Publication Order Number:

NCP2820/D

9−Pin Flip−Chip CSP

NCP2820

PIN CONNECTIONS

UDFN8

Negative

Differential

Input

8

7

6

5

OUTM

GND

VP

OUTP

INM

A1

B1

VP

C1

A2

A3

GNDINP OUTM

B2

VP

C2

SD

B3

GND

C3

OUTP

SD

VP

INP

INM

1

2

3

4

(Top View)

BATTERY

Cs

V

p

R

i

INM

R

f

OUTP

RAMP

GENERATOR

Data

Processor

CMOS Output

Stage

8 

= L

R

OUTM

Positive

Differential

Input

R

i

INP

R

f

300 k

Shutdown

Control

GND

SD

V

ih

V

il

Figure 1. Typical Application

PIN DESCRIPTION

Pin No.

CSP UDFN8

A1 3 INP I Positive Differential Input.

A2 7 GND I Analog Ground.

A3 8 OUTM O Negative BTL Output.

B1 2 V

B2 6 V

B3 7 GND I Analog Ground.

C1 4 INM I Negative Differential Input.

C2 1 SD I The device enters in Shutdown Mode when a low level is applied on this pin. An internal

C3 5 OUTP O Positive BTL Output.

Symbol Type Description

p

I Analog Positive Supply. Range: 2.5 V – 5.5 V.

I Power Analog Positive Supply. Range: 2.5 V – 5.5 V.

300 k resistor will force the device in shutdown mode if no signal is applied to this pin. It also helps to save space and cost.

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NCP2820

MAXIMUM RATINGS

Symbol Rating Max Unit

V

p

V

in

I

out

P

d

T

A

T

J

T

stg

R



JA

−

− Latchup Current @ TA = 85°C (Note 6) 9−Pin Flip−Chip

MSL Moisture Sensitivity (Note 7) Level 1

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.

1. The device is protected by a current breaker structure. See “Current Breaker Circuit” in the Description Information section for more

information.

2. The thermal shutdown is set to 160°C (typical) avoiding irreversible damage to the device due to power dissipation.

3. For the 9−Pin Flip−Chip CSP package, the R

2

total area and also 135°C/W with 500 mm2. When using ground and power planes, the value is around 90°C/W, as specified in table.

50 mm

4. Human Body Model: 100 pF discharged through a 1.5 k resistor following specification JESD22/A114. On 9−Pin Flip−Chip, B2 Pin (V

is qualified at 1500 V.

5. Machine Model: 200 pF discharged through all pins following specification JESD22/A115.

6. Latchup Testing per JEDEC Standard JESD78.

7. Moisture Sensitivity Level (MSL): 1 per IPC/JEDEC standard: J−STD−020A.

Supply Voltage Active Mode

Shutdown Mode

6.0

7.0

Input Voltage −0.3 to VCC +0.3 V

Max Output Current (Note 1) 1.5 A

Power Dissipation (Note 2) Internally Limited −

Operating Ambient Temperature −40 to +85 °C

Max Junction Temperature 150 °C

Storage Temperature Range −65 to +150 °C

Thermal Resistance Junction−to−Air 9−Pin Flip−Chip

UDFN8

90 (Note 3)

50

°C/W

ESD Protection

Human Body Model (HBM) (Note 4)

Machine Model (MM) (Note 5)

is highly dependent of the PCB Heatsink area. For example, R



JA

UDFN8

> 2000

> 200

$70

$100

can equal 195°C/W with



JA

mA

V

)

P

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NCP2820

ELECTRICAL CHARACTERISTICS (Limits apply for T

Characteristic

Operating Supply Voltage V

Supply Quiescent Current I

Shutdown Current I

Shutdown Voltage High V

Shutdown Voltage Low V

Switching Frequency F

Gain G

Output Impedance in Shutdown Mode Z

Resistance from SD to GND Rs − − 300 −

Symbol Conditions Min Typ Max Unit

p

dd

sd

sdih

sdil

sw

SD

= +25°C unless otherwise noted) (NCP2820FCT1G and NCP2820FCT2G)

A

TA = −40°C to +85°C 2.5 − 5.5 V

Vp = 3.6 V, RL = 8.0 

V

= 5.5 V, No Load

p

V

from 2.5 V to 5.5 V, No Load

p

= −40°C to +85°C

T

A

−

2.15

2.61

−

4.6

Vp = 4.2 V

T

= +25°C

A

T

= +85°C

A

−

0.42

0.45

0.8

−

Vp = 5.5 V

T

= +25°C

A

T

= +85°C

A



Vp from 2.5 V to 5.5 V

T

= −40°C to +85°C

A

RL = 8.0  285 k



−

0.8

0.9

1.5

−

1.2 − − V

− − 0.4 V

190 250 310 kHz

300 k

R

i

315 k

R

i

R

i

− 300 −

mA

A

k

Output Offset Voltage Vos Vp = 5.5 V − 6.0 − mV

Turn On Time To n Vp from 2.5 V to 5.5 V − 9.0 − ms

Turn Off Time To ff Vp from 2.5 V to 5.5 V − 5.0 − ms

Thermal Shutdown Temperature Ts d − − 160 − °C

Output Noise Voltage Vn V

RMS Output Power Po

= 3.6 V, f = 20 Hz to 20 kHz

p

no weighting filter

with A weighting filter

RL = 8.0 , f = 1.0 kHz, THD+N < 1%

V

= 2.5 V

p

= 3.0 V

V

p

V

= 3.6 V

p

V

= 4.2 V

p

V

= 5.0 V

p

Vrms

−

65 42

0.32

0.48

0.7

0.97

1.38

−

RL = 8.0 , f = 1.0 kHz, THD+N < 10%

V

p

V

p

V

p

V

p

V

p

= 2.5 V = 3.0 V = 3.6 V = 4.2 V = 5.0 V

−

0.4

0.59

0.87

1.19

1.7

−

RL = 4.0 , f = 1.0 kHz, THD+N < 1%

V

p

V

p

V

p

V

p

V

p

= 2.5 V = 3.0 V = 3.6 V = 4.2 V = 5.0 V

−

0.49

0.72

1.06

1.62

2.12

−

RL = 4.0 , f = 1.0 kHz, THD+N < 10%

V

p

V

p

V

p

V

p

V

p

= 2.5 V = 3.0 V = 3.6 V = 4.2 V = 5.0 V

−

0.6

0.9

1.33

2.0

2.63

−

V V



W

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NCP2820

ELECTRICAL CHARACTERISTICS (Limits apply for T

= +25°C unless otherwise noted) (NCP2820FCT1G and NCP2820FCT2G)

A

Characteristic UnitMaxTypMinConditionsSymbol

Efficiency −

RL = 8.0 , f = 1.0 kHz

V

= 5.0 V, P

p

= 3.6 V, P

V

p

out out

= 1.2 W = 0.6 W

−

91 90

−

RL = 4.0 , f = 1.0 kHz

Total Harmonic Distortion + Noise THD+N

V

= 5.0 V, P

p

V

= 3.6 V, P

p

V

= 5.0 V, RL = 8.0 ,

p

f = 1.0 kHz, P

V

= 3.6 V, RL = 8.0 ,

p

f = 1.0 kHz, P

= 2.0 W

out

= 1.0 W

out

= 0.25 W

out

= 0.25 W

out

Common Mode Rejection Ratio CMRR Vp from 2.5 V to 5.5 V

V

= 0.5 V to V

ic

V

= 3.6 V, Vic = 1.0 V

p

− 0.8 V

p

f = 217 Hz

f = 1.0 kHz

Power Supply Rejection Ratio PSRR

V

p_ripple_pk−pk

= 200 mV, RL = 8.0 ,

−

pp

−

82 81

0.05

0.09

−62

−56

−57

−

dB

−

dB

Inputs AC Grounded

V

= 3.6 V

p

f = 217 kHz f = 1.0 kHz

ELECTRICAL CHARACTERISTICS (Limits apply for T

Characteristic

Operating Supply Voltage V

Supply Quiescent Current I

Shutdown Current I

Symbol Conditions Min Typ Max Unit

p

dd

sd

= +25°C unless otherwise noted) (NCP2820MUTBG)

A

TA = −40°C to +85°C 2.5 − 5.5 V

Vp = 3.6 V, RL = 8.0 

V

= 5.5 V, No Load

p

V

from 2.5 V to 5.5 V, No Load

p

T

= −40°C to +85°C

A

Vp = 4.2 V

T

= +25°C

A

T

= +85°C

A

Vp = 5.5 V

T

= +25°C

A

T

= +85°C

A

Shutdown Voltage High V

Shutdown Voltage Low V

Switching Frequency F

Gain G

Output Impedance in Shutdown Mode Z

sdih

sdil

sw

SD

Vp from 2.5 V to 5.5 V

T



= −40°C to +85°C

A

RL = 8.0  285 k



Resistance from SD to GND Rs − − 300 −

−

−62

−65

2.15

2.61

−

3.8

−

mA

−

A

−

0.42

0.45

0.8

2.0

A

−

0.8

0.9

1.5

−

1.2 − − V

− − 0.4 V

180 240 300 kHz

300 k

R

i

− 20 −

315 k

R

i

R

i

k

Output Offset Voltage Vos Vp = 5.5 V − 6.0 − mV

Turn On Time To n Vp from 2.5 V to 5.5 V − 1.0 −

Turn Off Time To ff Vp from 2.5 V to 5.5 V − 1.0 −

s

Thermal Shutdown Temperature Ts d − − 160 − °C

Output Noise Voltage Vn V

= 3.6 V, f = 20 Hz to 20 kHz

p

no weighting filter

with A weighting filter

Vrms

−

65 42

−

%

V V

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NCP2820

ELECTRICAL CHARACTERISTICS (Limits apply for T

= +25°C unless otherwise noted) (NCP2820MUTBG)

A

Characteristic UnitMaxTypMinConditionsSymbol

RMS Output Power Po

RL = 8.0 , f = 1.0 kHz, THD+N < 1%

V

= 2.5 V

p

= 3.0 V

V

p

V

= 3.6 V

p

V

= 4.2 V

p

V

= 5.0 V

p

RL = 8.0 , f = 1.0 kHz, THD+N < 10%

V

= 2.5 V

p

V

= 3.0 V

p

V

= 3.6 V

p

= 4.2 V

V

p

V

= 5.0 V

p

RL = 4.0 , f = 1.0 kHz, THD+N < 1%

V

= 2.5 V

p

V

= 3.0 V

p

V

= 3.6 V

p

V

= 4.2 V

p

V

= 5.0 V

p

RL = 4.0 , f = 1.0 kHz, THD+N < 10%

V

= 2.5 V

p

V

= 3.0 V

p

V

= 3.6 V

p

V

= 4.2 V

p

V

= 5.0 V

p

Efficiency −

RL = 8.0 , f = 1.0 kHz

V

= 5.0 V, P

p

V

= 3.6 V, P

p

out out

= 1.2 W = 0.6 W

RL = 4.0 , f = 1.0 kHz

Total Harmonic Distortion + Noise THD+N

V

= 5.0 V, P

p

V

= 3.6 V, P

p

V

= 5.0 V, RL = 8.0 ,

p

f = 1.0 kHz, P

V

= 3.6 V, RL = 8.0 ,

p

f = 1.0 kHz, P

= 2.0 W

out

= 1.0 W

out

= 0.25 W

out

= 0.25 W

out

Common Mode Rejection Ratio CMRR Vp from 2.5 V to 5.5 V

V

= 0.5 V to V

ic

V

= 3.6 V, Vic = 1.0 V

p

− 0.8 V

p

f = 217 Hz

f = 1.0 kHz

Power Supply Rejection Ratio PSRR

V

p_ripple_pk−pk

= 200 mV, RL = 8.0 ,

Inputs AC Grounded

V

= 3.6 V

p

f = 217 kHz f = 1.0 kHz

−

0.22

0.33

0.45

0.67

0.92

−

W

−

0.36

0.53

0.76

1.07

1.49

−

W

−

0.24

0.38

0.57

0.83

1.2

−

W

−

0.52

0.8

1.125

1.58

2.19

−

%

−

87 87

79 78

−

%

−

0.05

0.06

−

dB

−

pp

−

−62

−56

−57

−

dB

−

−62

−65

−

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NCP2820

INP

INM

VP

4.7 F

OUTM

OUTP

GND

Load

30 kHz

Low Pass

Filter

Audio Input

Signal

C

+

C

−

Power Supply

R

i

R

i

+

−

Figure 2. Test Setup for Graphs

NOTES:

1. Unless otherwise noted, C

= 100 nF and Ri= 150 k. Thus, the gain setting is 2 V/V and the cutoff frequency of the

i

input high pass filter is set to 10 Hz. Input capacitors are shorted for CMRR measurements.

2. To closely reproduce a real application case, all measurements are performed using the following loads: RL = 8  means Load = 15 H + 8  + 15 H

= 4  means Load = 15 H + 4  + 15 H

R

L

Very low DCR 15 H inductors (50 m) have been used for the following graphs. Thus, the electrical load measurements are performed on the resistor (8  or 4 ) in differential mode.

3. For Efficiency measurements, the optional 30 kHz filter is used. An RC low−pass filter is selected with

(100 , 47 nF) on each PWM output.

+

Measurement

Input

−

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