LM4863 Headphone Function Datasheet

LM4863 Datasheet, PDF, Equivalent


Part Number

LM4863

Description

Dual 2.2W Audio Amplifier Plus Stereo Headphone Function

Manufacture

National Semiconductor

Total Page 16 Pages
Datasheet
Download LM4863 Datasheet


LM4863
October 1999
LM4863
Dual 2.2W Audio Amplifier Plus Stereo Headphone
Function
General Description
The LM4863 is a dual bridge-connected audio power ampli-
fier which, when connected to a 5V supply, will deliver 2.2W
to a 4load (Note 1) or 2.5W to a 3load (Note 2)with less
than 1.0% THD+N. In addition, the headphone input pin al-
lows the amplifiers to operate in single-ended mode to drive
stereo headphones.
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 LM4863 combines dual bridge
speaker amplifiers and stereo headphone amplifiers on one
chip.
The LM4863 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: An LM4863MTE which has been properly mounted to the circuit
board will deliver 2.2W into 4. The other package options for the LM4863
will deliver 1.1W into 8. See the Application Information section for
LM4863MTE usage information.
Note 2: An LM4863MTE which has been properly mounted to the circuit
board and forced-air cooled will deliver 2.5W into 3.
Key Specifications
n PO at 1% THD+N
into 3(LM4863MTE)
into 4(LM4863MTE)
into 8(LM4863)
n Single-ended mode - THD+N
at 75mW into 32
n Shutdown current
2.5W(typ)
2.2W(typ)
1.1W(typ)
0.5%(max)
0.7µA(typ)
Features
n Stereo headphone amplifier mode
n “Click and pop” suppression circuitry
n Unity-gain stable
n Thermal shutdown protection circuitry
n Exposed-DAP TSSOP, TSSOP, SOIC and DIP
packaging available
Applications
n Multimedia monitors
n Portable and desktop computers
n Portable televisions
Typical Application
* Refer to the section Proper Selection of External Components, for a detailed discussion of CB size.
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer® is a registered trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS012881
DS012881-1
www.national.com

LM4863
Connection Diagrams
DS012881-28
Top View
Order Number LM4863M, LM4863N
See NS Package Number M16B for SO
See NS Package Number N16A for DIP
DS012881-29
Top View
Order Number LM4863MT
See NS Package Number MTC20 for TSSOP
DS012881-2
Top View
Order Number LM4863MTE
See NS Package Number MXA20A for Exposed-DAP TSSOP
www.national.com
2


Features LM4863 Dual 2.2W Audio Amplifier Plus St ereo Headphone Function October 1999 LM4863 Dual 2.2W Audio Amplifier Plus S tereo Headphone Function General Descri ption The LM4863 is a dual bridge-conne cted audio power amplifier which, when connected to a 5V supply, will deliver 2.2W to a 4Ω load (Note 1) or 2.5W to a 3Ω load (Note 2)with less than 1.0 % THD+N. In addition, the headphone inp ut pin allows the amplifiers to operate in single-ended mode to drive stereo h eadphones. Boomer audio power amplifier s were designed specifically to provide high quality output power from a surfa ce mount package while requiring few ex ternal components. To simplify audio sy stem design, the LM4863 combines dual b ridge speaker amplifiers and stereo hea dphone amplifiers on one chip. The LM48 63 features an externally controlled, l ow-power consumption shutdown mode, a s tereo headphone amplifier mode, and the rmal shutdown protection. It also utili zes circuitry to reduce “clicks and pops” during device turn-on. No.
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