LM4839
Stereo 2W Audio Power Amplifiers
with DC Volume Control, Bass Boost, and Input Mux

General Description

The LM4839 is a monolithic integrated circuit that provides
DC volume control, and stereo bridged audio power amplifi-
ers capable of producing 2W into 4

(Note 1) with less than

1.0% THD+N, or 2.2W into 3

(Note 2) with less than 1.0%

THD+N.

Boomer

audio integrated circuits were designed specifically

to provide high quality audio while requiring a minimum
amount of external components. The LM4839 incorporates a
DC volume control, stereo bridged audio power amplifiers,
selectable gain or bass boost, and an input mux making it
optimally suited for multimedia monitors, portable radios,
desktop, and portable computer applications.

The LM4839 features an externally controlled, low-power
consumption shutdown mode, and both a power amplifier
and headphone mute for maximum system flexibility and
performance.

Note 1: When properly mounted to the circuit board, the LM4839LQ and
LM4839MTE will deliver 2W into 4

. The LM4839MT will deliver 1.1W into

. See the Application Information section for LM4839LQ and LM4839MTE

usage information.

Note 2: An LM4839LQ and LM4839MTE that have been properly mounted
to the circuit board and forced-air cooled will deliver 2.2W into 3

Key Specifications

at 1% THD+N

into 3

(LQ & MTE)

2.2W(typ)

into 4

(LQ & MTE)

2.0W(typ)

into 8

(LM4839) (MT, MTE, & LQ)

1.1W(typ)

Single-ended mode - THD+N at 85mW into
32

1.0%(typ)

Shutdown current

0.2µA(typ)

Features

DC Volume Control Interface

Input mux

System Beep Detect

Stereo switchable bridged/single-ended power amplifiers

Selectable internal/external gain and bass boost

"Click and pop" suppression circuitry

Thermal shutdown protection circuitry

Applications

Portable and Desktop Computers

Multimedia Monitors

Portable Radios, PDAs, and Portable TVs

Connection Diagrams

Boomer

is a registered trademark of NationalSemiconductor Corporation.

LLP Package

DS200134-83

Top View

Order Number LM4839LQ

See NS Package Number LQA028AA for Exposed-DAP LLP

April 2002

LM4839

Stereo

Audio

Power

Amplifiers

with

olume

Control,

Bass

Boost,

and

Input

Mux

DS200134

www.national.com

Absolute Maximum Ratings

(Note 10)

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

Internally limited

ESD Susceptibility (Note 12)

2500V

ESD Susceptibility (Note 13)

250V

Junction Temperature

150°C

Soldering Information

Vapor Phase (60 sec.)

215°C

Infrared (15 sec.)

220°C

See AN-450 "Surface Mounting and their Effects on
Product Reliability" for other methods of soldering
surface mount devices.

(typ) -- LQA028AA

3°C/W

(typ) -- LQA028AA

42°C/W

(typ) -- MTC28

20°C/W

(typ) -- MTC28

80°C/W

(typ) -- MXA28A

2°C/W

(typ) -- MXA28A (exposed

DAP) (Note 4)

41°C/W

(typ) -- MXA28A (exposed

DAP) (Note 3)

54°C/W

(typ) -- MXA28A (exposed

DAP) (Note 5)

59°C/W

(typ) -- MXA28A (exposed

DAP) (Note 6)

93°C/W

Operating Ratings

Temperature Range

MIN

MAX

-40°C

85°C

Supply Voltage

2.7V

5.5V

Electrical Characteristics for Entire IC

(Notes 7, 10)
The following specifications apply for V

= 5V and T

= 25°C unless otherwise noted.

Symbol

Parameter

Conditions

LM4839

Units

(Limits)

Typical

(Note 14)

Limit

(Note 15)

Supply Voltage

2.7

V (min)

5.5

V (max)

Quiescent Power Supply Current

= 0V, I

= 0A

mA (max)

Shutdown Current

shutdown

= V

0.7

2.0

µA (max)

VIN High on all Logic Inputs

0.8 x VDD

V (min)

VIN Low on all Logic Inputs

0.2 x VDD

V (max)

Electrical Characteristics for Volume Attenuators

(Notes 7, 10)
The following specifications apply for V

= 5V and T

= 25°C unless otherwise noted.

Symbol

Parameter

Conditions

LM4839

Units

(Limits)

Typical

(Note 14)

Limit

(Note 15)

RANGE

Attenuator Range

Gain with V

DCVol

= 5.0V, No Load

0.75

dB (max)

RANGE

Attenuator Range

Attenuation with V

DCVol

= 0V (BM &

SE)

-75

dB (min)

Mute Attenuation

mute

= 5V, Bridged Mode (BM)

-78

dB (min)

mute

= 5V, Single-Ended Mode (SE)

-78

dB (min)

LM4839

www.national.com

Electrical Characteristics for Single-Ended Mode Operation

(Notes 7, 10)
The following specifications apply for V

= 5V and T

= 25°C unless otherwise noted.

Symbol

Parameter

Conditions

LM4839

Units

(Limits)

Typical

(Note 14)

Limit

(Note 15)

Output Power

THD+N = 1.0%; f = 1kHz;
R

= 32

THD+N = 10%; f = 1 kHz; R

THD+N

Total Harmonic Distortion+Noise

OUT

= 1V

RMS

, f=1kHz, R

= 10k

= 1

0.065

PSRR

Power Supply Rejection Ratio

= 1.0 µF, f =120 Hz,

RIPPLE

= 200 mVrms

SNR

Signal to Noise Ratio

OUT

=75 mW, R

= 32

, A-Wtd

Filter

102

talk

Channel Separation

f=1kHz, C

= 1.0 µF

Electrical Characteristics for Bridged Mode Operation

(Notes 7, 10)
The following specifications apply for V

= 5V and T

= 25°C unless otherwise noted.

Symbol

Parameter

Conditions

LM4839

Units

(Limits)

Typical

(Note 14)

Limit

(Note 15)

Output Offset Voltage

= 0V, No Load

mV (max)

Output Power

THD + N = 1.0%; f=1kHz; R

= 3

(Note 8)

2.2

THD + N = 1.0%; f=1kHz; R

= 4

(Note 9)(Note 15)

THD = 1.5% (max);f = 1 kHz;
R

= 8

1.1

1.0

W (min)

THD+N = 10%;f = 1 kHz; R

= 8

1.5

THD+N

Total Harmonic Distortion+Noise

= 1W, 20 Hz

20 kHz,

= 8

, A

= 2

0.3

= 340 mW, R

= 32

1.0

PSRR

Power Supply Rejection Ratio

= 1.0 µF, f = 120 Hz,

RIPPLE

= 200 mVrms; R

= 8

SNR

Signal to Noise Ratio

= 5V, P

OUT

= 1.1W, R

= 8

A-Wtd Filter

talk

Channel Separation

f=1kHz, C

= 1.0 µF

Note 3: The

given is for an MXA28A package whose exposed-DAP is soldered to an exposed 2in

piece of 1 ounce printed circuit board copper.

Note 4: The

given is for an MXA28A package whose exposed-DAP is soldered to a 2in

piece of 1 ounce printed circuit board copper on a bottom side layer

through 21 8mil vias.

Note 5: The

given is for an MXA28A package whose exposed-DAP is soldered to an exposed 1in

piece of 1 ounce printed circuit board copper.

Note 6: The

given is for an MXA28A package whose exposed-DAP is not soldered to any copper.

Note 7: All voltages are measured with respect to the ground pins, unless otherwise specified. All specifications are tested using the typical application as shown
in Figure 2.

Note 8: When driving 3

loads from a 5V supply the LM4839MTE exposed DAP must be soldered to the circuit board and forced-air cooled.

Note 9: When driving 4

loads from a 5V supply the LM4839MTE exposed DAP must be soldered to the circuit board.

Note 10:

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

JMAX

, and the ambient temperature T

. The maximum

allowable power dissipation is P

DMAX

= (T

JMAX

- T

. For the LM4839MT, T

JMAX

= 150°C, and the typical junction-to-ambient thermal resistance, when board

mounted, is 80°C/W assuming the MTC28 package.

Note 12: Human body model, 100 pF discharged through a 1.5 k

resistor.

Note 13: Machine Model, 220 pF240 pF discharged through all pins.

Note 14: Typicals are measured at 25°C and represent the parametric norm.

LM4839

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