NSC LM4820IBP-6, LM4820MX-6, LM4820MM-6, LM4820IBPX-6 Datasheet

LM4820-6

Fixed Gain 1 Watt Audio Power Amplifier

General Description

The LM4820-6 is an audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1 watt of continuous average power to an 8Ω BTL load with less than 1% distortion (THD+N) at 6dB of BTL gain from a 5V

power supply.

Boomer audio poweramplifiersweredesigned specifically to provide high quality output power with a minimal amount of external components. The LM4820-6 does not require input and gain resistors, output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal parts count and low power consumption is a primary requirement.

The LM4820-6 features a low-power consumption shutdown mode, which is achieved by driving the shutdown pin with logic low. Additionally, the LM4820-6 features an internal thermal shutdown protection mechanism.

The LM4820-6 contains advanced pop & click circuitry which eliminates noises which would otherwise occur during turn-on and turn-off transitions.

Key Specifications

Improved PSRR at 217Hz 62dB

Power Output at 5.0V & 1% THD 1.0W(typ.)

Power Output at 3.3V & 1% THD 400mW(typ.)

Shutdown Current 0.1µA(typ.)

Features

n Fixed 6dB BTL voltage gain n Available in space-saving packages micro SMD, MSOP

and SOIC

n Ultra low current shutdown mode n Can drive capacitive loads up to 500 pF n Improved pop & click circuitry eliminates noises during

turn-on and turn-off transitions

n 2.0 - 5.5V operation n No output coupling capacitors, snubber networks or

bootstrap capacitors required

n External gain configuration still possible

Applications

n Mobile Phones n PDAs n Portable electronic devices

Typical Application

Boomer®is a registered trademark of National Semiconductor Corporation.

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FIGURE 1. Typical Audio Amplifier Application Circuit

April 2002

LM4820-6 Fixed Gain 1 Watt Audio Power Amplifier

Connection Diagram

8 Bump micro SMD

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Top View

Order Number LM4820IBP-6, LM4820IBPX-6

See NS Package Number BPA08DDB

Small Outline (SO) Package

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Top View

Order Number LM4820M-6

See NS Package Number M08A

Mini Small Outline (MSOP) Package

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Top View

Order Number LM4820MM-6

See NS Package Number MUA08A

micro SMD Marking

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Top View

X - Date Code T - Die Traceability G - Boomer Family

F - LM4820IBP-6

SO Marking

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Top View

XY - Date Code

TT - Die Traceability

Bottom 2 lines - Part Number ( LM4820M-6 )

MSOP Marking

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Top View

G- Boomer Family

26 - LM4820MM-6

LM4820-6

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Absolute Maximum Ratings (Note 2)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Supply Voltage 6.0V Storage Temperature −65˚C to +150˚C Input Voltage −0.3V to V

+0.3V Power Dissipation (Note 3) Internally Limited ESD Susceptibility (Note 4) 2500V ESD Susceptibility (Note 5) 250V Junction Temperature 150˚C Thermal Resistance

(SO) 35˚C/W

(SO) 150˚C/W

(micro SMD) 220˚C/W

(MSOP) 56˚C/W

(MSOP) 190˚C/W Soldering Information See AN-1112 ’microSMD Wafers Level Chip Scale

Package’.

Operating Ratings

Temperature Range

MIN

≤ TA≤ T

MAX

−40˚C ≤ TA≤ 85˚C

Supply Voltage 2.0V ≤ V

≤ 5.5V

Electrical Characteristics VDD=5V(Notes 1, 2, 8)

The following specifications apply for V

= 5V, AV= 1, and 8Ω load unless otherwise specified. Limits apply for TA= 25˚C.

Symbol Parameter Conditions

LM4820-6

UnitsTypical Limit

(Note 6) (Note 7)

Quiescent Power Supply Current VIN= 0V, Io= 0A 4 10 mA (max)

Shutdown Current V

shutdown

= GND 0.1 µA (max)

Output Power THD = 2% (max);f=1kHz 1 W

THD+N Total Harmonic Distortion+Noise P

= 0.4 Wrms; f = 1kHz 0.1 %

PSRR Power Supply Rejection Ratio V

ripple

= 200mV sine p-p 62 (f =

217Hz)

66 (f =

1kHz)

Fixed Voltage Gain 1.41Vinrms, RL=8Ω 6.0 6.5

5.5

dB Max

dB Min

Electrical Characteristics VDD= 3.3V (Notes 1, 2, 8)

The following specifications apply for V

= 3.3V, AV= 1, and 8Ω load unless otherwise specified. Limits apply for TA= 25˚C.

Symbol Parameter Conditions

LM4820-6

UnitsTypical Limit

(Note 6) (Note 7)

Quiescent Power Supply Current VIN= 0V, Io= 0A 3.5 mA (max)

Shutdown Current V

shutdown

= GND 0.1 µA (max)

Output Power THD = 1% (max); f = 1kHz 0.4 W

THD+N Total Harmonic Distortion+Noise P

= 0.15Wrms; f = 1kHz 0.1 %

PSRR Power Supply Rejection Ratio V

ripple

= 200mV sine p-p 60 (f =

217Hz)

62 (f =

1kHz)

Fixed Voltage Gain .7Vinrms, RL=8Ω 6.0 dB

LM4820-6

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Electrical Characteristics VDD= 2.6V (Notes 1, 2, 8)

The following specifications apply for V

= 2.6V and 8Ω Load unless otherwise specified. Limits apply for TA= 25˚C.

Symbol Parameter Conditions

LM4820-6

UnitsTypical Limit

(Note 6) (Note 7)

Quiescent Power Supply Current VIN= 0V, Io= 0A 2.6 mA (max)

Shutdown Current V

shutdown

= GND 0.1 µA (max)

Output Power ( 8Ω ) Output Power ( 4Ω )

THD = 1% (max);f=1kHzTHD = 1% (max);f=1kHz

0.2

0.4

W W

THD+N Total Harmonic Distortion+Noise P

= 0.1Wrms; f = 1kHz 0.08 %

PSRR Power Supply Rejection Ratio V

ripple

= 200mV sine p-p 44 (f =

217Hz)

44 (f =

1kHz)

Fixed Voltage Gain .5Vinrms, RL=8Ω 6.0 dB

Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified. Note 2:

Absolute Maximum Ratings

indicate limits beyond which damage to the device may occur.

Operating Ratings

indicate 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 Ratings. Specifications are not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device performance.

Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by T

JMAX

, θJA, and the ambient temperature TA. The maximum

allowable power dissipation is P

DMAX

=(T

JMAX–TA

)/θJAor the number given in Absolute Maximum Ratings, whichever is lower. For the LM4820-6, see power

derating curves for additional information.

Note 4: Human body model, 100 pF discharged through a 1.5 kΩ resistor. Note 5: Machine Model, 220 pF–240 pF discharged through all pins. Note 6: Typicals are measured at 25˚C and represent the parametric norm. Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level). Note 8: For micro SMD only, shutdown current is measured in a Normal Room Environment. Exposure to direct sunlight will increase I

by a maximum of 2µA.

External Components Description (

Figure 1

)

Components Functional Description

2. C

Input coupling capacitor which blocks the DC voltage at the amplifiers input terminals. Also creates a highpass filter with R

at fc= 1/(2π RiCi). Refer to the section, Proper Selection of External Components,

for an explanation of how to determine the value of C

4. C

Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply Bypassing section for information concerning proper placement and selection of the supply bypass capacitor.

5. C

Bypass pin capacitor which provides half-supply filtering. Refer to the section, Proper Selection of External Components, for information concerning proper placement and selection of C

Typical Performance Characteristics

THD+N vs Frequency at V

=5V,8ΩRL, and PWR = 250mW

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THD+N vs Frequency at V

= 3.3V, 8Ω RL, and PWR = 150mW

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Typical Performance Characteristics (Continued)

THD+N vs Frequency at V

= 2.6V, 8Ω RL, and PWR = 100mW

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THD+N vs Frequency at V

= 2.6V, 4Ω RL, and PWR = 100mW

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THD+N vs Power Out

VDD=5V,8ΩRL, 1kHz

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THD+N vs Power Out

VDD= 3.3V, 8Ω RL, 1kHz

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THD+N vs Power Out

VDD= 2.6V, 8Ω RL, 1kHz

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THD+N vs Power Out

VDD= 2.6V, 4Ω RL, 1kHz

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Typical Performance Characteristics (Continued)

Power Supply Rejection Ratio (PSRR)

VDD=5V

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Input terminated with 10Ω R

Power Supply Rejection Ratio (PSRR)

VDD=5V

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Input Floating

Power Supply Rejection Ratio (PSRR)

VDD= 2.6V

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Input terminated with 10Ω R

Power Supply Rejection Ratio (PSRR)

VDD= 3.3V

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Input terminated with 10Ω R

Power Dissipation vs Output Power V

= 3.3V

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Power Dissipation vs Output Power

VDD=5V

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