LM4911 - Stereo 40mW Low Noise Headphone Amplifier with Selectable Capacitive Coupled or OCL Output

Updated : 2020-01-09 14:24:08
Description

The LM4911/LM4911Q is an stereo audio power amplifier capable of delivering 40mW per channel of continuous average power into a 16Ω load or 25mW per channel into a 32Ω load at 1% THD+N from a 3V power supply.

Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. Since the LM4911/LM4911Q does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. In addition, the LM4911/LM4911Q may be configured for either single-ended capacitively coupled outputs or for OCL outputs (patent pending).

The LM4911/LM4911Q features a low-power consumption shutdown mode and a power mute mode that allows for faster turn on time with less than 1mV voltage change at outputs on release. Additionally, the LM4911/LM4911Q features an internal thermal shutdown protection mechanism.

The LM4911/LM4911Q is unity gain stable and may be configured with external gain-setting resistors.

A Q-grade version is available for automotive applications. It is AEC-Q100 grade 2 qualified and packaged in a 10–pin MSOP package (LM4911QMM).


Key Specifications

PSRR at 217Hz and 1kHz

65dB (typ)

Output Power at 1kHz with VDD = 2.4V,

1% THD+N into a 16Ω load

25mW (typ)

Output Power at 1kHz with VDD = 3V,

1% THD+N into a 16Ω load

40mW (typ)

Shutdown Current

2.0µA (max)

Output Voltage change on release from

Shutdown VDD = 2.4V, RL = 16Ω (C-Coupled)

1mV (max)

Mute Current

100µA (max)


Products containing the "LM4911" keyword are: LM4911 , LM4911LD , LM4911LD NOPB , LM4911LD/NOPB , LM4911LDX , LM4911MM , LM4911MM , LM4911MM/NOPB , LM4911MM/NOPB , LM4911MMX , LM4911MMX MSOP10 , LM4911MMX(GA3) , LM4911MMX/NOPB , LM4911MMX/NOPB , LM4911QMM , LM4911QMM/NOPB , LM4911QMM/NOPB , LM4911QMMX , LM4911QMMX/NOPB , LM4911QMMX/NOPB
Features

  • OCL or capacitively coupled outputs (patent pending)
  • External gain-setting capability
  • Available in space-saving MSOP and LD packages
  • Ultra low current shutdown mode
  • Mute mode allows fast turn-on (1ms) with less than 1mV change on outputs
  • 2V - 5.5V operation
  • Ultra low noise
  • LM4911QMM is an Automotive Grade product that is AE-Q100 grade 2 qualified.