ON Semiconductor NCP9004 Technical data

NCP9004

2.65 W Filterless Class−D Audio Power Amplifier

The NCP9004 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 NCP9004 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 NCP9004. Due to its low 42 V noise floor, A−weighted, a clean listening is guaranteed no matter the load sensitivity.

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9−PIN FLIP−CHIP CSP

FC SUFFIX

1

CASE 499E

MAQ = Device Code A = Assembly Location Y = Year WW = Work Week G = Pb−Free Package

PIN CONNECTIONS

9−Pin Flip−Chip CSP

MARKING DIAGRAM

MAQG

AYWW

1

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 and

THD+N < 1%

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

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

RL = 8.0 , P

= 100 mW

out

= 5.0 V,

p

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

• Surface Mounted Package 9−Pin Flip−Chip CSP (SnPb and Pb−Free)

• 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

Applications

• Cellular Phone

• Portable Electronic Devices

• PDAs and Smart Phones

• Portable Computer

A1

B1

VP

C1

INM

See detailed ordering and shipping information on page 16 of this data sheet.

Microcontroller

ORDERING INFORMATION

Audio

Input

from

DAC

1.6 mm

R

Input from

R

i

R

i

A2

GNDINP OUTM

B2

VP

C2

SD OUTP

(Top View)

VP

INP

INM

SD

GND

3.7 mm

A3

B3

GND

C3

Cs

OUTM

OUTP

Cs

August, 2006 − Rev. 2

Solution Size

1 Publication Order Number:

NCP9004/D

NCP9004

TYPICAL APPLICATION

BATTERY

Cs

R

f

R

i

INP

V

p

BYPASS

Negative

Differential

Input

V

BYPASS

p

GENERATOR

RAMP

Data

Processor

INTERNAL

BIASING

R

i

INM

BYPASS

R

f

300 k

Shutdown

Control

Positive

Differential

Input

V

ih

V

il

SD

Figure 1. Typical Application

PIN DESCRIPTION

Pin No. Symbol Type Description

A1 INP I Positive Differential Input.

A2 GND I Analog Ground.

A3 OUTM O Negative BTL Output.

B1 V

B2 V

p

B3 GND I Analog Ground.

C1 INM I Negative Differential Input.

C2 SD I

C3 OUTP O Positive BTL Output.

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

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

GND

OUTM

OUTP

8 

= L

R

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2

NCP9004

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) $70 mA

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

50 mm2 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.

4. Human Body Model: 100 pF discharged through a 1.5 k resistor following specification JESD22/A114. B2 pin (Vp) 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

V

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 90 (Note 3) °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

> 2000

> 200

can equal 195°C/W with



JA

V

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3

NCP9004

ELECTRICAL CHARACTERISTICS (Limits apply for T

= +25°C unless otherwise noted)

A

Symbol Characteristic Conditions Min Typ Max Unit

V

I

Operating Supply Voltage TA = −40°C to +85°C 2.5 − 5.5 V

p

Supply Quiescent Current

dd

Vp = 3.6 V, RL = 8.0 

= 5.5 V, No Load

V

p

−

2.15

2.61

−

mA

−

Vp from 2.5 V to 5.5 V, No Load

TA = −40°C to +85°C

I

sd

Shutdown Current

Vp = 4.2 V TA = +25°C TA = +85°C

−

0.42

0.45

4.6

0.8

−

Vp = 5.5 V TA = +25°C TA = +85°C

V

F

Shutdown Voltage High

sdih

Shutdown Voltage Low

sdil

Switching Frequency Vp from 2.5 V to 5.5 V

sw



−

0.8

0.9

1.5

−

1.2 − − V

− − 0.4 V

190 250 310 kHz

TA = −40°C to +85°C

G Gain

RL = 8.0  285 k

R

i

300 k

R

i

315 k

R

i

Rs Resistance from SD to GND − − 300 −

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

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

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

Ts d Thermal Shutdown Temperature − − 160 − °C

Vn Ouput Noise Voltage

Po RMS Output Power

V

= 3.6 V, f = 20 Hz to 20 kHz

p

no weighting filter

with A weighting filter

no weighting filter

with A weighting filter

RL = 8.0 , 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

Vrms

−

65 42

70 48

0.32

0.48

0.7

0.97

1.38

−

Vrms

−

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

−

A

V V

k

W

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4

NCP9004

ELECTRICAL CHARACTERISTICS (Limits apply for T

= +25°C unless otherwise noted)

A

Symbol UnitMaxTypMinConditionsCharacteristic

− Efficiency

RL = 8.0 , f = 1.0 kHz

= 5.0 V, P

V

p

V

= 3.6 V, P

p

out

= 1.2 W = 0.6 W

RL = 4.0 , f = 1.0 kHz

THD+N Total Harmonic Distortion + Noise

V

= 5.0 V, P

p

= 3.6 V, P

V

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

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

Vic = 0.5 V to V V

= 3.6 V, Vic = 1.0 V

p

− 0.8 V

p

f = 217 Hz f = 1.0 kHz

PSRR Power Supply Rejection Ratio

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

%

−

91 90

−

%

−

82 81

−

%

−

0.05

0.09

−

dB

−

pp

−

−62

−56

−57

−

dB

−

−62

−65

−

NCP9004

INP

INM

VP

OUTM

OUTP

GND

Load

30 kHz

Low Pass

Filter

+

Measurement

Input

−

Audio Input

Signal

C

R

i

+

C

i

R

−

i

4.7 F

+

Power

Supply

−

Figure 2. Test Setup for Graphs

NOTES:

1. Unless otherwise noted, Ci = 100 nF and Ri= 150 k. Thus, the gain setting is 2 V/V and the cutoff frequency of the 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 RL = 4  means Load = 15 H + 4  + 15 H

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.

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5

NCP9004

TYPICAL CHARACTERISTICS

100

90

80

70

60

50

40

30

EFFICIENCY (%)

20

10

0

0 0.5 1.0

Figure 3. Efficiency vs. P

NCP9004

Class AB

P

(W)

out

Vp = 5 V R

out

Vp = 5 V, RL = 8 , f = 1 kHz

100

90

80

70

60

50

40

30

EFFICIENCY (%)

20

10

0

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7

Figure 5. Efficiency vs. P

NCP9004

Class AB

P

(W)

out

Vp = 3.6 V RL = 8 

out

Vp = 3.6 V, RL = 8 , f = 1 kHz

= 8 

L

100

90

80

70

60

50

40

DIE TEMPERATURE (°C)

30

20

0 0.2 0.4

60

55

50

45

40

35

30

DIE TEMPERATURE (°C)

25

20

0 0.1 0.2

Class AB

NCP9004

0.6 0.8 1.0 1.2 1.4

P

(W)

out

Figure 4. Die Temperature vs. P

Vp = 5 V, RL = 8 , f = 1 kHz @ T

Class AB

NCP9004

0.3 0.4

P

(W)

out

0.5 0.6 0.7

Figure 6. Die Temperature vs. P

Vp = 3.6 V, RL = 8 , f = 1 kHz @ T

Vp = 5 V R

= 8 

L

out

= +25°C

A

Vp = 3.6 V RL = 8 

out

= +25°C

A

90

80

70

60

50

40

30

EFFICIENCY %

20

10

0

0 0.5 1.0 1.5

Figure 8. Efficiency vs. P

Vp = 5 V, RL = 4 , f = 1 kHz

NCP9004

Class AB

P

(W)

out

Vp = 5 V RL = 4 

2.0 2.5

out

160

140

120

100

80

60

DIE TEMPERATURE (°C)

40

20

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6

Class AB

0 0.5 1.0

P

(W)

out

Figure 7. Die Temperature vs. P

Vp = 5 V, RL = 4 , f = 1 kHz @ T

NCP9004

1.5 2.0

Vp = 5 V RL = 4 

out

= +25°C

A