NSC LM4819MX, LM4819MMX, LM4819MM, LM4819LDX, LM4819M Datasheet

LM4819

350mW Audio Power Amplifier with Shutdown Mode

General Description

The LM4819 is a mono bridged power amplifier that is capable of delivering 350mW

RMS

output power into a 16Ω load

or 300mW

RMS

output power into an 8Ω load with 10%

THD+N from a 5V power supply. The LM4819 Boomer audio power amplifier is designed

specifically to provide high quality output power and minimize PCB area with surface mount packaging and a minimal amount of external components. Since the LM4819 doesnot require output coupling capacitors, bootstrap capacitors or snubber networks, it is optimally suited for low-power portable applications.

The closed loop response of the unity-gain stable LM4819 can be configured using external gain-setting resistors. The device is available in LLP, MSOP, and SO package types to suit various applications.

Key Specifications

n THD+N at 1kHz, 350mW continuous average output

power into 16Ω 10% (max)

n THD+N at 1kHz, 300mW continuous average output

power into 8Ω 10% (max)

n Shutdown Current 0.7µA (typ)

Features

n LLP, SOP, and MSOP surface mount packaging. n Switch on/off click suppression. n Unity-gain stable. n Minimum external components.

Applications

n General purpose audio n Portable electronic devices n Information Appliances (IA)

Typical Application

Boomer®is a registered trademark of National Semiconductor Corporation.

DS200136-1

FIGURE 1. Typical Audio Amplifier Application Circuit

April 2002

LM4819 350mW Audio Power Amplifier with Shutdown Mode

Connection Diagrams

Small Outline (SO) Package

DS200136-35

Top View

Order Number LM4819M

See NS Package Number M08A

Mini Small Outline (MSOP) Package

DS200136-36

Top View

Order Number LM4819MM

See NS Package Number MUA08A

LLP Package

DS200136-74

Top View

Order Number LM4819LD

See NS Package Number LDA08B

SO Marking

DS200136-72

Top View

XY - Date Code

TT - Die Traceability

Bottom 2 lines - Part Number

MSOP Marking

DS200136-71

Top View

G - Boomer Family

19 - LM4819MM

LM4819

www.national.com 2

Absolute Maximum Ratings (Notes 2, 3)

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 (P

) (Note 4) Internally Limited ESD Susceptibility (Note 5) 3.5kV ESD Susceptibility (Note 6) 250V Junction Temperature (T

) 150˚C Soldering Information (Note 1) Small Outline Package

Vapor Phase (60 seconds) 215˚C

Infrared (15 seconds) 220˚C

Thermal Resistance

(MSOP) 56˚C/W

(MSOP) 210˚C/W

(SOP) 35˚C/W

(SOP) 170˚C/W

(LLP) 117˚C/W (Note 10)

(LLP) 150˚C/W (Note 11)

Operating Ratings (Notes 2, 3)

Temperature Range

MIN

≤ TA≤ T

MAX

−40˚C ≤ TA≤ 85˚C

Supply Voltage 2.0V ≤ V

≤ 5.5V

Electrical Characteristics VDD=5V(Notes 2, 3)

The following specifications apply for V

= 5V, RL=16Ωunless otherwise stated. Limits apply for TA= 25˚C.

Symbol Parameter Conditions

LM4819

Units

(Limits)

Typical Limit

(Note 7) (Notes 8, 9)

Quiescent Power Supply Current VIN= 0V, Io= 0A 1.5 3.0 mA (max)

Shutdown Current V

PIN1=VDD

(Note 12) 1.0 5.0 µA (max)

SDIH

Shutdown Voltage Input High 4.0 V (min)

SDIL

Shutdown Voltage Input Low 1.0 V (max)

Output Offset Voltage VIN= 0V 5 50 mV (max)

Output Power

THD = 10%, f

= 1kHz 350 mW

THD = 10%, f

= 1kHz, RL=8Ω 300 mW

THD+N Total Harmonic Distortion + Noise P

= 270mW

RMS,AVD

=2,fIN=

1kHz

Electrical Characteristics VDD=3V(Notes 2, 3)

The following specifications apply for V

= 3V and RL=16Ωload unless otherwise stated. Limits apply to TA= 25˚C.

Symbol Parameter Conditions

LM4819

Units

(Limits)

Typical Limit

(Note 7) (Notes 8, 9)

Quiescent Power Supply Current VIN= 0V, Io= 0A 1.0 3.0 mA (max)

Shutdown Current V

PIN1=VDD

(Note 12) 0.7 5.0 µA (max)

SDIH

Shutdown Voltage Input High 2.4 V (min)

SDIL

Shutdown Voltage Input Low 0.6 V (max)

Output Offset Voltage VIN= 0V 5 50 mV

Output Power

THD = 10%, f

= 1kHz 110 mW

THD = 10%, f

= 1kHz, RL=8Ω 90 mW

THD+N Total Harmonic Distortion + Noise P

= 80mW

RMS,AVD

=2,fIN=

1kHz

LM4819

www.national.com3

Electrical Characteristics VDD=3V(Notes 2, 3)

The following specifications apply for V

= 3V and RL=16Ωload unless otherwise stated. Limits apply to TA=

25˚C. (Continued)

Note 1: See AN-450 ’Surface Mounting and their Effects on Product Reliability’ for other methods of soldering surface mount devices. Note 2: All voltages are measured with respect to the ground pin, unless otherwise specified. Note 3:

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’s performance.

Note 4: 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

)/θJA. For the LM4819, T

JMAX

= 150˚C and the typical junction-to-ambient thermal resistance (θJA) when board

mounted is 210˚C/W for the MSOP package and 170˚C/W for the SOP package.

Note 5: Human body model, 100pF discharged through a 1.5 kΩ resistor. Note 6: Machine Model, 220pF–240pF capacitor is discharged through all pins. Note 7: Typical specifications are specified at 25˚C and represent the parametric norm. Note 8: Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level). Note 9: Datasheet min/max specification limits are guaranteed by designs, test, or statistical analysis. Note 10: The given θ

is for an LM4819 package in an LDA08B with the Exposed-DAP soldered to a printed circuit board copper pad with an area equivalent to

that of the Exposed-DAP itself. The Exposed-DAP of the LDA08B package should be electrically connected to GND or an electrically isolated copper area. Note 11: The given θ

is for an LM4819 package in an LDA08B with the Exposed-DAP not soldered to any printed circuit board copper.

Note 12: The shutdown pin (pin1) should be driven as close as possible to V

for minimum current in Shutdown Mode.

External Components Description (

Figure 1

)

Components Functional Description

1. R

Combined with Rf, this inverting input resistor sets the closed-loop gain. Rialso forms a high pass filter with C

at fc= 1/(2πRiCi).

2. C

This input coupling capacitor blocks DC voltage at the amplifier’s terminals. Combined with Ri, it creates a high pass filter with R

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

for an explanation of how to determine the value of C

3. R

Combined with Ri, this is the feedback resistor that sets the closed-loop gain: Av= 2(RF/Ri).

4. C

This is the power supply bypass capacitor that filters the voltage applied to the power supply pin. Refer to the Application Information section for proper placement and selection of C

5. C

This is the bypass pin capacitor that filters the voltage at the BYPASS pin. 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

DS200136-37

THD+N vs Frequency

DS200136-38

LM4819

www.national.com 4

Typical Performance Characteristics (Continued)

THD+N vs Frequency

DS200136-39

THD+N vs Frequency

DS200136-40

THD+N vs Frequency

DS200136-41

THD+N vs Frequency

DS200136-42

THD+N vs Output Power

DS200136-43

THD+N vs Output Power

DS200136-44

LM4819

www.national.com5

Typical Performance Characteristics (Continued)

THD+N vs Output Power

DS200136-45

THD+N vs Output Power

DS200136-73

THD+N vs Output Power

DS200136-47

THD+N vs Output Power

DS200136-46

Output Power vs Supply Voltage R

=8Ω

DS200136-49

Output Power vs Supply Voltage R

=16Ω

DS200136-48

LM4819

www.national.com 6

Typical Performance Characteristics (Continued)

Output Power vs Supply Voltage R

=32Ω

DS200136-51

Output Power vs Load Resistance

DS200136-50

Power Dissipation vs Output Power V

=5V

DS200136-53

Power Dissipation vs Output Power V

=3V

DS200136-52

Power Derating Curves

DS200136-55

Frequency Response vs Input Capacitor Size

DS200136-54

LM4819

www.national.com7

+ 14 hidden pages