How to choose the audio amplifier/boost/charging management IC for Bluetooth speakers?

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How to choose the audio amplifier/boost/charging management IC for Bluetooth speakers? [Copy link]

The power of battery-powered Bluetooth speakers and portable square dance speakers is getting bigger and bigger. Because of the maturity and stability of related charging circuits, supply chain support, cost requirements and other factors, single-cell lithium battery 3.7V, dual-cell lithium battery 7.4V, three-cell lithium battery or lead-acid battery 12V power supply is the mainstream solution for market applications. The output power of 3.7V, 7.4V, and 12V direct supply is limited, so boosting and then powering the amplifier is the main way to increase the output power. Due to the existence of boost efficiency, power amplifier efficiency, and the limitations of chip package thermal resistance, the built-in boost amplifier chip can solve some application requirements. If the power is larger, the most reasonable and reliable approach at this stage is an external boost + audio amplifier. In order to meet market demand, Shenzhen Yongfukang Technology Co., Ltd. integrates advantageous resources to organize solutions for various applications as follows:

Single-cell lithium battery 3.7V combination functional block diagram:

Single-cell lithium battery 3.7V combination selection and feature description:

Note: Unless otherwise specified, the speaker impedance is 4Ω, ×2 means dual-channel output, and the 1%THD output power is approximately 0.8 times the 10%THD output power (Po_1%thd≈0.8×Po_10%thd).

Functional block diagram of dual-cell lithium battery 7.4V combination:

Dual-cell 7.4V lithium battery combination selection and feature description:

Note: Unless otherwise specified, the speaker impedance is 4Ω, ×2 means dual-channel output, and the 1%THD output power is approximately 0.8 times the 10%THD output power (Po_1%thd≈0.8×Po_10%thd).

Functional block diagram of three lithium batteries or lead-acid batteries 12V combination:

Selection of three lithium or lead-acid batteries 12V combination and a brief description of their characteristics:

Note: Unless otherwise specified, the speaker impedance is 4Ω, ×2 means dual-channel output, and the 1%THD output power is approximately 0.8 times the 10%THD output power (Po_1%thd≈0.8×Po_10%thd).

Buck charging management selection table:

Boost charging management selection table (5V USB input, no adapter required):