National Semiconductor LM4836 Technical data

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LM4836 Stereo 2W Audio Power Amplifiers with DC Volume Control, Bass Boost, and Input Mux

PRELIMINARY

LM4836

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

General Description

The LM4836 is a monolithic integrated circuit that provides
DC volume control, and stereo bridged audio power amplifi­ers capable of producing 2W into 4Ω (Note 1) with less than

1.0%THD+N, or 2.2W into 3Ω (Note 2) with less than 1.0
THD+N.

®

Boomer
to provide high quality audio while requiring a minimum
amount of external components. The LM4836 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 LM4836 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 LM4836MTE will
deliver 2W into 4Ω. TheLM4836MTwill deliver 1.1W into 8Ω. See the Appli­cation Information section for LM4836MTE usage information.

Note 2: An LM4836MTE which has been properly mounted to the circuit
board and forced-air cooled will deliver 2.2W into 3Ω.

audio integrated circuits were designed specifically

Key Specifications

n POat 1%THD+N

into 3Ω (LM4836MTE) 2.2W(typ)

%

into 4Ω (LM4836MTE) 2.0W(typ)
into 8Ω (LM4836) 1.1W(typ)

n Single-ended mode - THD+N

at 85mW into 32Ω

n Shutdown current 0.2µA(typ)

Features

n PC98 and PC99 Compliant
n DC Volume Control Interface
n Input mux
n System Beep Detect
n Stereo switchable bridged/single-ended power amplifiers
n Selectable internal/external gain and bass boost

configurable

n “Click and pop” suppression circuitry
n Thermal shutdown protection circuitry

June 1999

1.0%(typ)

Applications

n Portable and Desktop Computers
n Multimedia Monitors
n Portable Radios, PDAs, and Portable TVs

Connection Diagram

TSSOP Package

DS101088-2

Top View

See NS Package Number MTC28 for TSSOP

See NS Package Number MXA28A for Exposed DAP TSSOP

Boomer®is a registered trademark of NationalSemiconductor Corporation.

© 1999 National Semiconductor Corporation DS101088 www.national.com

Order Number LM4836MT

Order Number LM4836MTE

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

DD

+0.3V

θ

(typ)— MTC28 20˚C/W

JC

θ

(typ)— MTC28 80˚C/W

JA

θ

(typ)— MXA28A 2˚C/W

JC

θ

(typ)— MXA28A (Note 4) 41˚C/W

JA

θ

(typ)— MXA28A (Note 3) 54˚C/W

JA

θ

(typ)— MXA28A (Note 5) 59˚C/W

JA

θ

(typ)— MXA28A (Note 6) 93˚C/W

JA

Power Dissipation Internally limited
ESD Susceptibility (Note 12) 2500V
ESD Susceptibility (Note 13) 250V
Junction Temperature 150˚C
Soldering Information

Operating Ratings

Temperature Range

≤ TA≤T

T

MIN

Supply Voltage 2.7V≤ V

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.

Electrical Characteristics for Entire IC

(Notes 7, 10)
The following specifications apply for VDD= 5V and TA= 25˚C unless otherwise noted.

Symbol Parameter Conditions

V

DD

I

DD

I

SD

V

IH

V

IL

Supply Voltage 2.7 V (min)

Quiescent Power Supply Current VIN= 0V, IO= 0A 15 30 mA (max)
Shutdown Current V

pin 24=VDD

Headphone Sense High Input Voltage 4 V (min)
Headphone Sense Low Input Voltage 0.8 V (max)

MAX

−40˚C ≤TA ≤ 85˚C
≤ 5.5V

DD

LM4836

Typical

(Note 14)

Limit

(Note 15)

5.5 V (max)

0.2 2.0 µA (max)

Units

(Limits)

Electrical Characteristics for Volume Attenuators

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

Symbol Parameter Conditions

C

C
A

RANGE

RANGE
M

Attenuator Range Gain with V

Attenuator Range Attenuation with V
Mute Attenuation V

= 5V and TA= 25˚C unless otherwise noted.

DD

≥ 4.5V 0

pin 5

= 0V -73 -70 dB (min)

= 5V, Bridged Mode -88 -80 dB (min)

pin 3

V

= 5V, Single-Ended Mode -80 -70 dB (min)

pin 3

pin 5

Electrical Characteristics for Single-Ended Mode Operation

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

Symbol Parameter Conditions

P

O

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Output Power THD+N = 1.0%; f = 1kHz;

= 5V and TA= 25˚C unless otherwise noted.

DD

=32Ω

R

L

THD+N = 10%;f=1kHz; R
32Ω

=

L

LM4836

Typical

(Note 14)

Limit

(Note 15)

±

0.5 dB (max)

0 −1.0 dB (min)

LM4836

Typical

(Note 14)

Limit

(Note 15)

85 mW

95 mW

Units

(Limits)

Units

(Limits)

Electrical Characteristics for Single-Ended Mode Operation (Continued)

(Notes 7, 10)
The following specifications apply for VDD= 5V and TA= 25˚C unless otherwise noted.

Symbol Parameter Conditions

THD+N Total Harmonic Distortion+Noise V

PSRR Power Supply Rejection Ratio C

SNR Signal to Noise Ratio P

X

talk

Channel Separation f=1kHz, CB= 1.0 µF 65 dB

=1V

OUT

=1

A

VD

= 1.0 µF, f =120 Hz,

B

V

RIPPLE
OUT

Filter

, f=1kHz, RL= 10kΩ,

RMS

= 200 mVrms

=75 mW, RL=32Ω, A-Wtd

LM4836

Typical

(Note 14)

Limit

(Note 15)

0.065

58 dB

102 dB

Units

(Limits)

Electrical Characteristics for Bridged Mode Operation

(Notes 7, 10)
The following specifications apply for VDD= 5V and TA= 25˚C unless otherwise noted.

Symbol Parameter Conditions

V

OS

P

O

Output Offset Voltage VIN= 0V 10 50 mV (max)
Output Power THD+N=1.0%; f=1kHz; RL=3Ω

(Note 8)
THD+N=1.0%; f=1kHz; R

(Note 9)(Note 15)

=4Ω

L

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

=8Ω

R

L

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

THD+N Total Harmonic Distortion+Noise P

PSRR Power Supply Rejection Ratio C

SNR Signal to Noise Ratio V

X

talk

Note 3: The θJAgiven is for an MXA28A package whose exposed-DAP is soldered to an exposed 2in2piece of 1 ounce printed circuit board copper.
Note 4: The θ

through 21 8mil vias.

Note 5: The θ
Note 6: The θ
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 3Ω loads from a 5V supply the LM4836MTE exposed DAP must be soldered to the circuit board and forced-air cooled.
Note 9: When driving 4Ω loads from a 5V supply the LM4836MTE exposed DAP must be soldered to the circuit board.
Note 10:

functional, but do not guarantee specific performance limits.
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
allowable power dissipation is P
mounted, is 80˚C/W assuming the MTC28 package.

Note 12: Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 13: Machine Model, 220 pF–240 pF discharged through all pins.
Note 14: Typicals are measured at 25˚C and represent the parametric norm.
Note 15: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Channel Separation f=1kHz, CB= 1.0 µF 70 dB

given is for an MXA28A package whose exposed-DAP is soldered to a 2in2piece of 1 ounce printed circuit board copper on a bottom side layer

JA

given is for an MXA28A package whose exposed-DAP is soldered to an exposed 1in2piece of 1 ounce printed circuit board copper.

JA

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

JA

Absolute Maximum Ratings

indicate limits beyond which damage to the device may occur.

DMAX

=(T

)/θJA. For the LM4836MT,T

JMAX−TA

= 1W, 20 Hz<f<20 kHz,

O

=8Ω,AVD=2

R

L

P

= 340 mW, RL=32Ω 1.0

O

= 1.0 µF, f = 120 Hz,

B

= 200 mVrms; RL=8Ω

V

RIPPLE

= 5V, P

DD

A-Wtd Filter

Electrical Characteristics

= 1.1W, RL=8Ω,

OUT

state DC and AC electrical specifications under particular test conditions which

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

JMAX

=8Ω 1.5 W

L

Operating Ratings

JMAX

Typical

(Note 14)

Limit

(Note 15)

2.2 W

2W

1.1 1.0 W (min)

0.3

74 dB

93 dB

indicate conditions for which the device is

, θJA, and the ambient temperature TA. The maximum

LM4836

Units

(Limits)

%

%

%

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Typical Application

DS101088-3

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FIGURE 1. Typical Application Circuit

Truth Table for Logic Inputs (Note 16)

Mute Mux Control HP Sense Inputs Selected Bridged Output Single-Ended Output

0 0 0 Left In 1, Right In 1 Vol. Adjustable ­0 0 1 Left In 1, Right In 1 Muted Vol. Adjustable
0 1 0 Left In 2, Right In 2 Vol. Adjustable ­0 1 1 Left In 2, Right In 2 Muted Vol. Adjustable
1 X X - Muted Muted

Note 16: If system beep is detected on the Beep in pin (pin 11) and beep is fed to inputs, the system beep will be passed through the bridged amplifier regardless
of the logic of the Mute, HP sense, or DC Volume Control pins.

Typical Performance Characteristics
MTE Specific Characteristics

LM4836MTE
THD+N vs Output Power

DS101088-70

LM4836MTE
THD+N vs Frequency

DS101088-73

Note 17: These curves show the thermal dissipation ability of the LM4836MTE at different ambient temperatures given these conditions:

500LFPM + 2in

2

2in

2in

2

1in
Not Attached: The part is not soldered down and is not forced-air cooled.

2

on bottom: The part is soldered to a 2in2, 1oz. copper plane that is on the bottom side of the PC board through 21 8 mil vias.

2

: The part is soldered to a 1in2, 1oz. copper plane.

: The part is soldered to a 2in2, 1 oz. copper plane with 500 linear feet per minute of forced-air flow across it.

: The part is soldered to a 2in2, 1oz. copper plane.

LM4836MTE
THD+N vs Frequency

DS101088-71

LM4836MTE
Power Dissipation vs Output Power

DS101088-65

LM4836MTE
THD+N vs Output Power

LM4836MTE (Note 17)
Power Derating Curve

DS101088-72

DS101088-64

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