LM4858 Datasheet, PDF (1/17 Pages) National Semiconductor (TI) – Mono 1.5 W / Stereo 300mW Power Amplifier

May 2003
LM4858
Mono 1.5 W / Stereo 300mW Power Amplifier
General Description
The LM4858 is an audio power amplifier capable of deliver-
ing 1.5W (typ) of continuous average power into a mono 4Ω
bridged-tied load (BTL) with 1% THD+N or 95mW per chan-
nel of continuous average power into stereo 32Ω single-
ended (SE) loads with 1% THD+N, using a 5V power supply.
The LM4858 can automatically switch between mono BTL
and stereo SE modes utilizing a headphone sense pin. It is
ideal for any system that provides both a monaural speaker
output and a stereo line or headphone output
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. Since the LM4858 does not require
bootstrap capacitors or snubber networks, it is optimally
suited for low-power portable systems.
The LM4858 features an externally controlled, micropower
consumption shutdown mode and thermal shutdown protec-
tion. The unity-gain stable LM4858’s gain is set by external
gain-setting resistors
Key Specifications
n Output Power at 1% THD+N, 1kHz:
n LM4858LD 3Ω BTL
n LM4858LD 4Ω BTL
n LM4858MM 4Ω BTL
n LM4858MM,LD 8Ω BTL
n LM4858MM,LD 8Ω SE
n LM4858MM,LD 32Ω SE
n THD+N at 1kHz, 95mW into 32Ω SE
n Single Supply Operation
n Shutdown Current
1.9W (typ)
1.7W (typ)
1.5W (typ)
1.1W (typ)
300mW (typ)
95mW (typ)
1% (typ)
2.4 to 5.5V
18µA (typ)
Features
n Mono 1.5W BTL or stereo 300mW output
n Logic controlled headphone sense
n “Click and pop” suppression circuitry
n No bootstrap capacitors required
n Thermal shutdown protection
n Unity-gain stable
n Available in space-saving MSOP and LLP packaging
Applications
n Portable computers
n Desktop computers
n PDA’s
n Handheld games
Connection Diagrams
20064729
Top View
10 Lead MSOP
Order Number LM4858MM
See NS Package Number MUB10A
20064728
Top View
14 Lead LLP
Order Number LM4858LD
See NS Package Number LDA14A
Boomer^® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation DS200647
www.national.com