LM4875_15 Datasheet, PDF (1/21 Pages) Texas Instruments – 750 mW Audio Power Amplifier with DC Volume Control and Headphone Switch

LM4875
www.ti.com
SNAS042C – JANUARY 2002 – REVISED MAY 2013
LM4875
750 mW Audio Power Amplifier with DC Volume
Control and Headphone Switch
Check for Samples: LM4875
FEATURES
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•2 Precision DC Voltage Volume Control
• Headphone Amplifier Mode
• “Click and Pop” Suppression
• Shutdown Control When Volume Control Pin Is
Low
• Thermal Shutdown Protection
APPLICATIONS
• GSM Phones and Accessories, DECT, Office
Phones
• Hand Held Radio
• Other Portable Audio Devices
KEY SPECIFICATIONS
• P_O at 1.0% THD+N Into 8Ω; 750 mW (typ)
• P_O at 10% THD+N Into 8Ω; 1 W (typ)
• Shutdown Current; 0.7µA(typ)
• Supply Voltage Range; 2.7V to 5.5 V
DESCRIPTION
The LM4875 is a mono bridged audio power amplifier
with DC voltage volume control. The LM4875 is
capable of delivering 750mW of continuous average
power into an 8Ω 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
LM4875's micropower shutdown mode (I_Q = 0.7µA,
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.
TYPICAL APPLICATION
CONNECTION DIAGRAM
Small Outline Package (SOIC)
Mini Small Outline Package (VSSOP)
Top View
See Package Number D, DGK
Figure 1. Typical Audio Amplifier Application
Circuit
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2002–2013, Texas Instruments Incorporated