NSC LM4836MTX, LM4836MTEX, LM4836MTE, LM4836MT Datasheet

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

audio integrated circuits were designed specifically 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.

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

1.0%(typ)

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

Applications

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

Connection Diagram

Boomer®is a registered trademark of NationalSemiconductor Corporation.

TSSOP Package

DS101088-2

Top View

Order Number LM4836MT

See NS Package Number MTC28 for TSSOP

Order Number LM4836MTE

See NS Package Number MXA28A for Exposed DAP TSSOP

PRELIMINARY

June 1999

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

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)— MTC28 20˚C/W

(typ)— MTC28 80˚C/W

(typ)— MXA28A 2˚C/W

(typ)— MXA28A (Note 4) 41˚C/W

(typ)— MXA28A (Note 3) 54˚C/W

(typ)— MXA28A (Note 5) 59˚C/W

(typ)— MXA28A (Note 6) 93˚C/W

Operating Ratings

Temperature Range

MIN

≤ TA≤T

MAX

−40˚C ≤TA ≤ 85˚C

Supply Voltage 2.7V≤ V

≤ 5.5V

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

LM4836

Units

(Limits)

Typical

(Note 14)

Limit

(Note 15)

Supply Voltage 2.7 V (min)

5.5 V (max)

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

Shutdown Current V

pin 24=VDD

0.2 2.0 µA (max)

Headphone Sense High Input Voltage 4 V (min)

Headphone Sense Low Input Voltage 0.8 V (max)

Electrical Characteristics for Volume Attenuators

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

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

Symbol Parameter Conditions

LM4836

Units

(Limits)

Typical

(Note 14)

Limit

(Note 15)

RANGE

Attenuator Range Gain with V

pin 5

≥ 4.5V 0

0.5 dB (max)

0 −1.0 dB (min)

RANGE

Attenuator Range Attenuation with V

pin 5

= 0V -73 -70 dB (min)

Mute Attenuation V

pin 3

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

pin 3

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

Electrical Characteristics for Single-Ended Mode Operation

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

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

Symbol Parameter Conditions

LM4836

Units

(Limits)

Typical

(Note 14)

Limit

(Note 15)

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

=32Ω

85 mW

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

32Ω

95 mW

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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

LM4836

Units

(Limits)

Typical

(Note 14)

Limit

(Note 15)

THD+N Total Harmonic Distortion+Noise V

OUT

=1V

RMS

, f=1kHz, RL= 10kΩ,

0.065

PSRR Power Supply Rejection Ratio C

= 1.0 µF, f =120 Hz,

RIPPLE

= 200 mVrms

58 dB

SNR Signal to Noise Ratio P

OUT

=75 mW, RL=32Ω, A-Wtd

Filter

102 dB

talk

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

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

LM4836

Units

(Limits)

Typical

(Note 14)

Limit

(Note 15)

Output Offset Voltage VIN= 0V 10 50 mV (max)

Output Power THD+N=1.0%; f=1kHz; RL=3Ω

(Note 8)

2.2 W

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

=4Ω

(Note 9)(Note 15)

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

=8Ω

1.1 1.0 W (min)

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

=8Ω 1.5 W

THD+N Total Harmonic Distortion+Noise P

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

=8Ω,AVD=2

0.3

= 340 mW, RL=32Ω 1.0

PSRR Power Supply Rejection Ratio C

= 1.0 µF, f = 120 Hz,

RIPPLE

= 200 mVrms; RL=8Ω

74 dB

SNR Signal to Noise Ratio V

= 5V, P

OUT

= 1.1W, RL=8Ω,

A-Wtd Filter

93 dB

talk

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

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

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

through 21 8mil vias. Note 5: The θ

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

Note 6: The θ

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 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:

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

, θJA, and the ambient temperature TA. The maximum

allowable power dissipation is P

DMAX

=(T

JMAX−TA

)/θJA. For the LM4836MT,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 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).

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Typical Application

DS101088-3

FIGURE 1. Typical Application Circuit

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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

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

500LFPM + 2in

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

2in

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.

2in

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

1in

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

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

LM4836MTE THD+N vs Output Power

DS101088-70

LM4836MTE THD+N vs Frequency

DS101088-71

LM4836MTE THD+N vs Output Power

DS101088-72

LM4836MTE THD+N vs Frequency

DS101088-73

LM4836MTE Power Dissipation vs Output Power

DS101088-65

LM4836MTE (Note 17) Power Derating Curve

DS101088-64

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