LM49352RLX/NOPB

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The LM49352RLX/NOPB is an integrated audio amplifier circuit developed by Texas Instruments, specifically tailored for portable audio applications. It is 2.28 Volt rail-to-rail audio amplifier with integrated charge pump for independent rail-to-rail control. Its applications include cell phones, portable RADIOS and MP3 players, and digital hearing aids.

The integrated charge pump from this amplifier consists of 1.2V and 5V voltage reference inputs. It also has eight output pins with outputs to charge pumps, a gain select pin, a reset pin, digital mute pin, and a power supply pin. This allows for flexible, independent control of voltage rails for improved overall audio performance.

The LM49352RLX provides maximum output power of 86mW at 10% THD with supply voltage of 1.9V, and total harmonic distortion (THD) of 0.01%. With only a few external components, this IC is capable of delivering excellent audio performance with low power consumption rates.

To ensure proper functioning of this device, it must be configured correctly and especially LM49352RLX must be connected to the power rails with proper polarity. It is important to note that the LM49352RLX/NOPB should never be operated at a voltage higher than 5.5V as it is not rated for higher voltage. At higher voltages, it could cause damage to the IC due to overcurrent and thermal dissipation.

Once the IC is properly rated and configured, the LM49352RLX utilizes an internal power stage to drive the loudspeakers. The speakers are connected to the output pins of the IC and the resistors can be placed in series with them to adjust the output levels. The power stage consists of an OP-AMP, a source follower, and current booster and can be configured to offer either single-ended or differential output. The gain select pin (GAINSEL) can be connected to ground to configure for a single-ended output. Alternatively, the GAINSEL pin can be connected to the power supply voltage to configure for a differential output. The charge pump can also be used to adjust the power supply rail voltages for optimal current consumption.

In addition to the power stage, the LM49352RLX also contains an audio signal chain that consists of a headphone amplifier, an amplifier for protection against capacitive load, and a mute circuit. The headphone amplifier is capable of driving up to 40mA of into a 16Ω impedance. The capacitive load amplifier ensures that no audio is lost when the system is connected to a low impedance load, such as a headphone jack. The mute circuit allows for the muting of the amplifier in case of overcurrent or other fault scenarios.

The LM49352RLX/NOPB is an excellent choice for portable audio applications due to its low power consumption and high performance. Its integrated charge pump, audio signal chain, and power stage provide an excellent audio experience while allowing for independent rail-to-rail control. Additionally, its small footprint and minimal external components make it suitable for a wide variety of audio applications.

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