LM4836MT National Semiconductor, LM4836MT Datasheet

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LM4836MT

Manufacturer Part Number
LM4836MT
Description
Stereo 2W Audio Power Amplifiers with DC Volume Control/ Bass Boost/ and Input Mux
Manufacturer
National Semiconductor
Datasheet

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© 1999 National Semiconductor Corporation
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 amplifi-
ers capable of producing 2W into 4
1.0% THD+N, or 2.2W into 3
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 4 . The LM4836MT will deliver 1.1W into 8 . See the Appli-
cation 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 3 .
Connection Diagram
Boomer
®
is a registered trademark of NationalSemiconductor Corporation.
®
audio integrated circuits were designed specifically
(Note 2) with less than 1.0%
See NS Package Number MXA28A for Exposed DAP TSSOP
(Note 1) with less than
See NS Package Number MTC28 for TSSOP
DS101088
Order Number LM4836MTE
Order Number LM4836MT
TSSOP Package
Top View
Key Specifications
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
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
n P
n Single-ended mode - THD+N
n Shutdown current
configurable
at 85mW into 32
into 3
into 4
into 8
DS101088-2
O
at 1% THD+N
(LM4836MTE)
(LM4836MTE)
(LM4836)
PRELIMINARY
www.national.com
0.2µA(typ)
2.2W(typ)
2.0W(typ)
1.1W(typ)
1.0%(typ)
June 1999

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LM4836MT Summary of contents

Page 1

... Note 1: When properly mounted to the circuit board, the LM4836MTE will deliver 2W into 4 . The LM4836MT will deliver 1.1W into 8 . See the Appli- cation 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 ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Storage Temperature Input Voltage −0. Power Dissipation ESD Susceptibility (Note 12) ESD Susceptibility (Note 13) Junction Temperature Soldering Information Vapor Phase (60 sec.) Infrared (15 sec.) See AN-450 “ ...

Page 3

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

Page 4

Typical Application www.national.com 4 ...

Page 5

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

Page 6

Non-MTE Specific Characteristics THD+N vs Frequency DS101088-57 THD+N vs Frequency DS101088-15 THD+N vs Frequency DS101088-18 THD+N vs Frequency DS101088-21 www.national.com THD+N vs Frequency DS101088-58 THD+N vs Frequency DS101088-16 THD+N vs Frequency DS101088-19 THD+N vs Frequency DS101088-22 6 THD+N vs Frequency ...

Page 7

Non-MTE Specific Characteristics THD+N vs Output Power DS101088-25 THD+N vs Output Power DS101088-28 THD+N vs Output Power DS101088-31 THD+N vs Output Power DS101088-34 (Continued) THD+N vs Output Power DS101088-26 THD+N vs Output Power DS101088-29 THD+N vs Output Power DS101088-32 THD+N ...

Page 8

Non-MTE Specific Characteristics Output Power vs Load Resistance DS101088-62 Power Supply Rejection Ratio DS101088-38 Noise Floor DS101088-41 www.national.com (Continued) Output Power vs Load Resistance DS101088-6 Dropout Voltage DS101088-53 Noise Floor DS101088-42 8 Output Power vs Load Resistance DS101088-7 Output Power ...

Page 9

Non-MTE Specific Characteristics Power Dissipation vs Output Power DS101088-51 Power Derating Curve DS101088-63 Output Power vs Supply voltage DS101088-54 (Continued) Power Dissipation vs Output Power DS101088-52 Crosstalk DS101088-49 Output Power vs Supply Voltage DS101088-56 9 External Gain/ Bass Boost Characteristics ...

Page 10

... With low impedance loads, the output power at the loads is heavily dependent on trace resistance from the output pins of the LM4836. Traces from the output of the LM4836MTE to the load or load connectors should be as wide as practical. Any resistance in the output traces will reduce the power de- livered to the load ...

Page 11

Application Information (Continued) signal to noise ratio. Low gain configurations require large in- put signals to obtain a given output power. Input signals equal to or greater than 1Vrms are available from sources such as audio codecs. Besides gain, one ...

Page 12

Application Information with the DC volume control. However the gain of the outputs can be configured by adjusting the feedback and input resis- tors for the input op-amp. The input op-amp inverting configuration where the gain is: ...

Page 13

Application Information (Continued) BASS BOOST FUNCTION The Bass Boost Function can be toggled by changing the logic at pin 19. A logic low will switch the power amplifiers to bass boost mode. In bass boost mode the low frequency gain ...

Page 14

... Physical Dimensions inches (millimeters) unless otherwise noted www.national.com TSSOP Package Order Number LM4836MT NS Package Number MTC28 for TSSOP 14 ...

Page 15

... Physical Dimensions inches (millimeters) unless otherwise noted (Continued) NS Package Number MXA28A for Exposed-DAP TSSOP Exposed-DAP TSSOP Package Order Number LM4836MTE 15 www.national.com ...

Page 16

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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