LM4910 LM4910 Output Capacitor-less Stereo 35mW Headphone Amplifier | TI.com


LM4910 Output Capacitor-less Stereo 35mW Headphone Amplifier



The LM4910 is an audio power amplifier primarily designed for headphone applications in portable device applications. It is capable of delivering 35mW of continuous average power to a 32Ω load with less than 1% distortion (THD+N) from a 3.3VDC power supply.

The LM4910 utilizes a new circuit topology that eliminates output coupling capacitors and half-supply bypass capacitors. The LM4910 contains advanced pop & click circuitry which eliminates noises caused by transients that would otherwise occur during turn-on and turn-off.

Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. Since the LM4910 does not require any output coupling capacitors, half-supply bypass capacitors, or bootstrap capacitors, it is ideally suited for low-power portable applications where minimal space and power consumption are primary requirements.

The LM4910 features a low-power consumption shutdown mode, activated by driving the shutdown pin with logic low. Additionally, the LM4910 features an internal thermal shutdown protection mechanism. The LM4910 is also unity-gain stable and can be configured by external gain-setting resistors.

Key Specifications

PSRR at f = 217Hz

65dB (typ)

Power Output at VDD = 3.3V, RL = 32Ω, and THD 1%

35mW (typ)

Shutdown Current

0.1µA (typ)


  • Eliminates headphone amplifier output coupling capacitors
  • Eliminates half-supply bypass capacitor
  • Advanced pop & click circuitry eliminates noises during turn-on and turn-off
  • Ultra-low current shutdown mode
  • Unity-gain stable
  • 2.2V - 5.5V operation
  • Available in space-saving MSOP, LLP, and SOIC packages

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