LM4865| Datasheet

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LM4865 750 mW Audio Power Amplifier with DC Volume Control and Headphone Switch

October 2002

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 voltage volume control. The LM4865 is capable of delivering 750mW of continuous average power into an 8 load with less than 1% THD when powered by a 5V power supply. Switching between bridged speaker mode and headphone (single ended) mode is accomplished using the headphone sense pin. To conserve power in portable applications, the LM4865's micropower shutdown mode (IQ = 0.7uA, typ) is activated when less than 300mV is applied to the DC Vol/SD pin. Boomer audio power amplifiers are designed specifically to provide high power audio output while maintaining high fidelity. They require few external components and operate on low supply voltages. n Other portable audio devices

Key Specifications
j PO at 1.0% THD+N into 8

750mW (typ) 1W (typ) 0.7uA(typ) 2.7V to 5.5V

SO, micro SMD
j PO at 10% THD+N into 8

SO, micro SMD
j Shutdown current j Supply voltage range

Features
n n n n n DC voltage volume control Headphone amplifier mode "Click and pop" suppression Shutdown control when volume control pin is low Thermal shutdown protection

Applications
n GSM phones and accessories, DECT, office phones n Hand held radio

Connection Diagrams
micro SMD Package Small Outline Package (SO) Mini Small Outline Package (MSOP)

10102502

Top View Order Number LM4865M, LM4865MM See NS Package Number M08A, MUA08A
10102536

Top View Order Number LM4865IBP See NS Package Number BPA08CFB

BOOMERTM is a trademark of National Semiconductor Corporation.

2002 National Semiconductor Corporation

DS101025

www.national.com