SNAS109F – SEPTEMBER 1999 – REVISED MAY 2013
725mW Audio Power Amplifier with Shutdown
Check for Samples: LM4864
•23 VSSOP, SOIC, PDIP ,(1) and WSON Packaging
• No Output Coupling Capacitors, Bootstrap
Capacitors, or Snubber Circuits are Necessary
• Thermal Shutdown Protection Circuitry
• Unity-Gain Stable
• External Gain Configuration Capability
• Cellular phones
• Personal computers
• General purpose audio
• PO at 1% THD+N with VDD = 5V, 1kHz
– LM4864LD, 4Ω load 625 mW (typ)
– LM4864LD, 8Ω load 725 mW (typ)
– LM4864M & LM4864N(1), 8Ω load 675 mW
– LM4864MM, 8Ω load (2) 300 mW (typ)
– LM4864, 16Ω load 550 mW (typ)
– Shutdown current 0.7 µA (typ)
(1) Not recommended for new designs. Contact TI Audio
(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 θJA = 210°C. For higher output power
possibilities refer to POWER DISSIPATION.
The LM4864 is a bridged audio power amplifier
capable of delivering 725mW of continuous average
power into an 8Ω load with 1% THD+N from a 5V
Boomer® audio power amplifiers were designed
specifically to provide high quality output power from
a low supply voltage while requiring a minimal
amount of external components. Since the LM4864
does not require output coupling capacitors, bootstrap
capacitors or snubber networks, it is optimally suited
for low-power portable applications.
The LM4864 features an externally controlled, low
power consumption shutdown mode, and thermal
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
types to suit various applications.
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.
Boomer is a registered trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
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 © 1999–2013, Texas Instruments Incorporated