lm4873iblx National Semiconductor Corporation, lm4873iblx Datasheet

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lm4873iblx

Manufacturer Part Number
lm4873iblx
Description
Dual 2.1w Audio Amplifier Plus Stereo Headphone Function
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2002 National Semiconductor Corporation
LM4873
Dual 2.1W Audio Amplifier Plus Stereo Headphone
Function
General Description
The LM4873 is a dual bridge-connected audio power ampli-
fier which, when connected to a 5V supply, will deliver 2.1W
to a 4Ω load (Note 1) or 2.4W to a 3Ω load (Note 2) with less
than 1.0% THD+N. In addition, the headphone input pin
allows the amplifiers to operate in single-ended mode when
driving stereo headphones. A MUX control pin allows selec-
tion between the two stereo sets of amplifier inputs. The
MUX control can also be used to select two different
closed-loop responses.
Boomer audio power amplifiers were designed specifically to
provide high quality output power from a surface mount
package while requiring few external components. To sim-
plify audio system design, the LM4873 combines dual bridge
speaker amplifiers and stereo headphone amplifiers on one
chip.
The LM4873 features an externally controlled, low-power
consumption shutdown mode, a stereo headphone amplifier
mode, and thermal shutdown protection. It also utilizes cir-
cuitry to reduce “clicks and pops” during device turn-on.
Note 1:
properly mounted to a circuit board will deliver 2.1W into 4Ω. The other
package options for the LM4873 will deliver 1.1W into 8Ω. See the Applica-
tion
LM4873MTE-1, LM4873MTE, and the LM4873LQ.
Note 2: An LM4873MTE-1, LM4873MTE, or LM4873LQ that has been prop-
erly mounted to a circuit board and forced-air cooled will deliver 2.4W into 3Ω.
Connection Diagrams
Boomer
See NS Package Number MXA28A for Exposed-DAP
Information
®
is a registered trademark of National Semiconductor Corporation.
An LM4873MTE-1, LM4873MTE, or LM4873LQ that has been
Order Number LM4873MTE-1
sections
for
Top View
TSSOP
further
information
DS100993
10099330
concerning
the
Key Specifications
Features
n Input mux control and two separate inputs per channel
n Stereo headphone amplifier mode
n “Click and pop” suppression circuitry
n Thermal shutdown protection circuitry
n PCB area-saving micro SMD and thin micro SMD
n TSSOP and exposed-DAP TSSOP and LLP packages
Applications
n Multimedia monitors
n Portable and desktop computers
n Portable audio systems
j
j
j
j
See NS Package Number MXA20A for Exposed-DAP
packages
at 75mW into 32Ω
P
Shutdown current
Supply voltage range
Single-ended mode THD+N
O
LM4873LQ, 3Ω, 4Ω loads
LM4873MTE-1, 3Ω, 4Ω loads 2.4W(typ), 2.1W(typ)
LM4873IBL, 8Ω load
LM4873MTE, 4Ω
LM4873, 8Ω
See NS Package Number MTC20 for TSSOP
at 1% THD+N
Order Number LM4873MT, LM4873MTE
Top View
TSSOP
2.4W(typ), 2.1W(typ)
10099302
October 2002
www.national.com
0.5%(max)
2V to 5.5V
0.7µA(typ)
1.1W(typ)
1.9W(typ)
1.1W(typ)

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lm4873iblx Summary of contents

Page 1

... Connection Diagrams Top View Order Number LM4873MTE-1 See NS Package Number MXA28A for Exposed-DAP TSSOP Boomer ® registered trademark of National Semiconductor Corporation. © 2002 National Semiconductor Corporation Key Specifications THD+N O LM4873LQ, 3Ω, 4Ω loads LM4873MTE-1, 3Ω ...

Page 2

Connection Diagrams Top View Order Number LM4873LQ See NS Package Number LQA24A for Exposed-DAP LLP micro SMD Marking Top View XY - Date Code TT - Die Traceability G - Boomer Family I - LM4873IBL Pin (Bump) Number Pin (Bump) ...

Page 3

Typical Application Note: Pin out shown for the 28-pin Exposed-DAP TSSOP package. Refer to the Connection Diagrams for the pin out of the 20-pin Exposed-DAP TSSOP, Exposed-DAP LLP, and micro SMD packages. 3 10099331 www.national.com ...

Page 4

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 Power Dissipation (Note 4) ESD Susceptibility (Note 5) ESD Susceptibility (Note 6) Junction ...

Page 5

Electrical Characteristics for Bridged-Mode Operation The following specifications apply for V Symbol Parameter THD+N Total Harmonic Distortion+Noise PSRR Power Supply Rejection Ratio X Channel Separation TALK SNR Signal To Noise Ratio Electrical Characteristics for Single-Ended Operation The following specifications apply ...

Page 6

Electrical Characteristics for Single-Ended Operation Note 18: The quiescent power supply current depends on the offset voltage when a practical load is connected to the amplifier. Note 19: Output power is measured at the device terminals. Note 20: When driving ...

Page 7

Typical Performance Characteristics MTE (20-pin) and LQ (24-pin) Specific Characteristics 2 500LFPM + 2.5in : The part is soldered to a 2.5in 2 2 2.5in : The part is soldered to a 2.5in , 1oz. copper plane. Not Attached: The ...

Page 8

Typical Performance Characteristics MTE-1 (28 pin) Specific Characteristics 2 2 2in on bottom: The part is soldered to a 2in 2 2 2in : The part is soldered to a 2in , 1oz. copper plane 1in : The ...

Page 9

Typical Performance Characteristics THD+N vs Output Power THD+N vs Output Power Output Power vs Load Resistance (Continued) 10099387 10099386 10099384 9 THD+N vs Frequency 10099389 THD+N vs Frequency 10099388 Power Dissipation vs Supply Voltage 10099385 www.national.com ...

Page 10

Typical Performance Characteristics Output Power vs Supply Voltage Output Power vs Supply Voltage Output Power vs Load Resistance www.national.com (Continued) 10099309 10099311 LM4873IBL Stereo Output Power 10099313 10 Output Power vs Supply Voltage 10099310 Output Power vs Load Resistance 10099312 ...

Page 11

Typical Performance Characteristics Power Dissipation vs Output Power Power Derating Curve Noise Floor (Continued) 10099314 10099316 10099318 11 Dropout Voltage vs Supply Voltage 10099315 Power Dissipation vs Output Power 10099317 Channel Separation 10099319 www.national.com ...

Page 12

Typical Performance Characteristics Channel Separation Open Loop Frequency Response External Components Description (Refer to Figure 1.) Components 1. R The inverting input resistance, along with R i filter with f = 1/(2π The input coupling capacitor blocks ...

Page 13

Application Information LM4863 PIN CONFIGURATION COMPATIBILITY The LM4873’s pin configuration simplifies the process of upgrading systems that use the LM4863. Except for its four MUX function pins, the LM4873’s pin configuration matches the LM4863’s pin configuration. If the LM4873’s MUX ...

Page 14

Application Information power. The LM4873LQ achieves the same output power level without forced air cooling. In all circumstances and conditions, the junction temperature must be held below 150˚C to prevent activating the LM4873’s thermal shutdown protection. The LM4873’s power de-rating ...

Page 15

Application Information mode has a distinct advantage over the single-ended con- figuration: its differential output doubles the voltage swing across the load. This produces four times the output power when compared to a single-ended amplifier under the same conditions. This ...

Page 16

Application Information microprocessor microcontroller. When using a switch, connect an external 10kΩ pull-up resistor between the SHUTDOWN pin and V . Connect the switch between the DD SHUTDOWN pin and ground. Select normal amplifier opera- tion by closing ...

Page 17

Application Information Input Capacitor Value Selection Amplifying the lowest audio frequencies requires high value input coupling capacitor (C in Figure 2). A high value capaci- i tor can be expensive and may compromise space efficiency in portable designs. In many ...

Page 18

Application Information without clipping or other audible distortion. The choice of supply voltage must also not create a situation that violates maximum power dissipation as explained above in the Power Dissipation section. After satisfying the LM4873’s power dissipation require- ments, ...

Page 19

Application Information Figure 7. Recommended LQ PC Board Layout: Component-Side Silkscreen Figure 9. Recommended LQ PC Board Layout: Upper Inner-Layer Layout Figure 11. Recommended LQ PC Board Layout: Bottom-Side Layout (Continued) 10099339 Figure 8. Recommended LQ PC Board Layout: 10099341 ...

Page 20

Application Information Figure 13. Recommended 20-pin micro SMD PC Board Layout: Component-Side Layout Figure 15. Recommended 20-pin micro SMD PC Board Layout: Lower Inner-Layer Layout www.national.com (Continued) Figure 14. Recommended 20-pin micro SMD PC Board 10099345 10099347 Figure 16. Recommended ...

Page 21

Physical Dimensions inches (millimeters) unless otherwise noted X1 = 1.996 X1 = 1.996 20-Bump micro SMD Order Number LM4873IBL NS Package Number BLA20AAB ± ± 0. 2.492 0. 0.945 20-Bump micro SMD Order Number LM4873ITL NS ...

Page 22

Physical Dimensions 20-Lead MOLDED PKG, TSSOP, JEDEC, 4.4mm BODY WIDTH www.national.com inches (millimeters) unless otherwise noted (Continued) Order Number LM4873MT NS Package Number MTC20 22 ...

Page 23

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 24-Lead MOLDED PKG, Leadless Leadframe Package LLP Order Number LM4873LQ NS Package Number LQA24A 23 www.national.com ...

Page 24

Physical Dimensions 20-Lead MOLDED TSSOP, EXPOSED PAD, 6.5x4.4x0.9mm www.national.com inches (millimeters) unless otherwise noted (Continued) Order Number LM4873MTE NS Package Number MXA20A 24 ...

Page 25

... 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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