LM4864

www.ti.com

SNAS109F – SEPTEMBER 1999 – REVISED MAY 2013

LM4864

725mW Audio Power Amplifier with Shutdown

Mode

Check for Samples: LM4864

1

FEATURES

DESCRIPTION

The LM4864 is a bridged audio power amplifier

23

•

capable of delivering 725mW of continuous average

•

No Output Coupling Capacitors, Bootstrap

power into an 8

Ω load with 1% THD+N from a 5V

Capacitors, or Snubber Circuits are Necessary

power supply.

•

Thermal Shutdown Protection Circuitry

•

Unity-Gain Stable

specifically to provide high quality output power from

a low supply voltage while requiring a minimal

•

External Gain Configuration Capability

amount of external components. Since the LM4864

does not require output coupling capacitors, bootstrap

APPLICATIONS

capacitors or snubber networks, it is optimally suited

•

Cellular phones

for low-power portable applications.

•

Personal computers

The LM4864 features an externally controlled, low

•

General purpose audio

power consumption shutdown mode, and thermal

shutdown protection.

KEY SPECIFICATIONS

The closed loop response of the unity-gain stable

•

LM4864 can be configured by external gain-setting

resistors. The device is available in multiple package

–

LM4864LD, 4

Ω load 625 mW (typ)

types to suit various applications.

–

LM4864LD, 8

Ω load 725 mW (typ)

–

Ω load 675 mW

(typ)

–

LM4864MM, 8

–

LM4864, 16

Ω load 550 mW (typ)

–

Shutdown current 0.7 µA (typ)

(1)

Not recommended for new designs. Contact TI Audio

Marketing.

(2)

The DGK0008BA package is thermally limited to 595 mW of

power dissipation at room temperature. Referring to Figure 21

in Typical Performance Characteristics, the power dissipation

limitation for the package occurs at 300 mW of output power.

This package limitation is based on 25°C ambient

temperature and

possibilities refer to POWER DISSIPATION.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

Boomer is a registered trademark of Texas Instruments.

3

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 1999–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.