LM4911 Texas instruments

LM4911

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LM4911

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Описание

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)

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.

Output power (W)	0.04
Analog supply (min) (V)	2
Analog supply (max) (V)	5.5
Load (min) (Ω)	16
PSRR (dB)	65
Rating	Catalog
Operating temperature range (°C)	-40 to 85
Headphone channels	Stereo
Volume control	No
Shutdown current (ISD) (µA)	0.1
Architecture	Class-AB
Iq per channel (typ) (mA)	1