The latest DSM smart amplifier that maximizes the potential of miniature speakers

     Maxim introduces the MAX98390 smart amplifier, which integrates Dynamic Speaker Management (DSM) algorithms to dramatically increase volume and achieve clearer, richer sound quality, with the lowest static power consumption on the market, and further reduce size to meet the demanding demands of users for stylish products. The boosted digital Class D DSM intelligent amplifier safely and stably delivers a higher level of power (up to 5.1W, far exceeding the typical value of 1-3W) to the miniature speaker, fully utilizing the audio performance of the system.

     Today's consumer devices require speakers to fit into smaller space sizes, leading to an increasing number of applications using miniature speakers. The smaller the speaker, the lower the volume or sound pressure level (SPL), and the higher the resonant frequency, resulting in bass attenuation. By increasing the micro speaker drive to increase the volume and low frequency response, it is easy to cause overheating and vibration film swing too large, and damage the micro speaker.

     The MAX98390 easily addresses these design challenges by employing integrated IV (current and voltage) detection technology and Maxim's proprietary DSM algorithm to drive the speaker to its maximum limits and provide overshoot and overheat protection. The thermal protection features of DSM devices enable designers to safely and stably drive speakers, breaking through rated power limits and achieving maximum volume. DSM diaphragm protection enables the designer to drive the speaker to the limits specified by its diaphragm, breaking the lower limit of the resonant frequency and improving the low frequency response (two octaves).

     In order to effectively protect the speaker, the amplifier algorithm must be based on a good understanding of the characteristics of the speaker, such as the resonant frequency, diaphragm swing limits, and voice coil thermal protection. Traditionally, designers have had to go through a time-consuming and complex feature analysis process or rely on vendor support to feature their speakers and their housings. Since most projects use different speakers during the prototype development phase, suppliers need to provide support for up to several weeks or require special equipment and expertise, further increasing the design challenge.

     The MAX98390 helps customers quickly and easily feature a wide range of speakers through the easy-to-use DSM Sound Studio GUI, dramatically reducing design time. Combined with DSM's thermal protection, maximum volume is achieved within minutes over an ultra-wide frequency range without complex programming. In order to meet the development needs of miniaturization of equipment and battery miniaturization, the MAX98390 provides up to 86% peak efficiency, and uses DSM's perceived power reduction (PPR) technology to further increase efficiency by 25%. The minimum static power consumption is only 24mW, effectively extending battery life, and is ideal for low-power devices.