LM4861_03 Datasheet, PDF (1/12 Pages) National Semiconductor (TI) – 1.1W Audio Power Amplifier with Shutdown Mode

February 2003
LM4861
1.1W Audio Power Amplifier with Shutdown Mode
General Description
The LM4861 is a bridge-connected audio power amplifier
capable of delivering 1.1W of continuous average power to
an 8Ω load with 1% THD+N using a 5V power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components using surface mount packaging. Since
the LM4861 does not require output coupling capacitors,
bootstrap capacitors, or snubber networks, it is optimally
suited for low-power portable systems.
The LM4861 features an externally controlled, low-power
consumption shutdown mode, as well as an internal thermal
shutdown protection mechanism.
The unity-gain stable LM4861 can be configured by external
gain-setting resistors for differential gains of up to 10 without
the use of external compensation components. Higher gains
may be achieved with suitable compensation.
Key Specifications
j THD+N for 1kHz at 1W continuous
average output power into 8Ω
j Output power at 10% THD+N
at 1kHz into 8Ω
j Shutdown Current
1.0% (max)
1.5W (typ)
0.6µA (typ)
Features
n No output coupling capacitors, bootstrap capacitors, or
snubber circuits are necessary
n Small Outline (SO) packaging
n Compatible with PC power supplies
n Thermal shutdown protection circuitry
n Unity-gain stable
n External gain configuration capability
Applications
n Personal computers
n Portable consumer products
n Self-powered speakers
n Toys and games
Connection Diagram
Small Outline Package
Top View
Order Number LM4861M
See NS Package Number M08A
01198602
Boomer^® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation DS011986
www.national.com