LM4865 Datasheet, PDF (1/9 Pages) National Semiconductor (TI) – 750 mW Audio Power Amplifier with DC Volume Control and Headphone Switch

December 1999
LM4865
750 mW Audio Power Amplifier with DC Volume Control
and Headphone Switch
General Description
The LM4865 is a mono bridged audio power amplifier with
DC volume control, capable of delivering 750 mW of continu-
ous average power into an 8Ω load with less than 1% THD
from a 5V power supply. Switching between bridged speaker
mode and headphone (single ended) mode is accomplished
via a headphone sense pin. In addition, LM4865 is set into
low current consumption shutdown mode (0.7 µA typical) by
lowering the DC Vol/SD pin to below 0.3V.
Boomer audio power amplifiers are designed specifically to
provide high power audio output, with quality sound, from a
low supply voltage source while requiring the minimal
amount of external components.
Applications
n GSM phones and accessories, DECT, office phones
n Hand held radio
n Other portable audio devices
Key Specifications
n P_O at 1.0% THD+N into 8Ω (SOP): 750 mW (typ)
n P_O at 10% THD+N into 8Ω (SOP): 1W (typ)
n Shutdown Current: 0.7 µA (typ)
Features
n DC volume control
n Headphone amplifier mode
n “Click and pop” suppression
n Shutdown control when volume control pin is low
n Thermal shutdown protection
Typical Application
Connection Diagram
MSOP, SOP Package
DS101025-1
FIGURE 1. Typical Audio Amplifier
Application Circuit
DS101025-2
Top View
Order Number LM4865M, LM4865MM
See NS Package Number M08A, MUA08A
BOOMER™ is a trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS101025
www.national.com