Infineon upgrades class D audio amplifier multichip module

Infineon Technologies AG has enhanced its class D audio power amplifier family with the introduction of the MERUS 2-channel, analog input, class D audio amplifier multichip module (MCM). The MA5332MS is an upgrade to its predecessor, offering the same or higher output power than monolithic alternatives, without a heat sink and 50 percent smaller.

MERUS class D audio amplifier MCM. Click for a larger image. (Source: Infineon Technologies)

The MA5332MS, in the 100-400 W/channel range, is suited for consumer products including home theaters in a box, soundbars, subwoofers, and mini-component systems. It also can be used for professional applications such as active speakers, active studio monitors, guitar amplifiers, aftermarket automotive, and marine audio amplifiers.

The class D audio power amplifier MCM, housed in a 7 × 7 mm 42-pin QFN package, integrates a dual-channel PWM controller, a high-voltage gate driver, and four low R DS(ON) MOSFETs. Τhanks to its very low R DS(on) class D output stage (24.4 mΩ typical), it can deliver 2 × 100 W at 4 Ω operating heat-sink-free or 2 x 200 W at 4 Ω with a small 8°C/W heat sink, said Infineon.

The MA5332MS offers differential or single-ended input and multiple output configuration options, single-ended (2x SE), bridge-tied load (BTL), and parallel single-ended (PSE), using a single or split power supply. Infineon said “enabling an SE topology as an alternative to BTL allows for reduced bus capacitors and output low-pass filters.”

MERUS MA5332MS class D audio amplifier MCM block diagram. Click for a larger image. (Source: Infineon Technologies)

The MCM also integrates protection circuitry for over-current, over-temperature, and under-voltage with self-reset capability, eliminating the need for external protection devices. In addition, the MCM uses a new internal logic scheme to control soft-start operation, which provides a further reduction of click and pop noise, said Infineon. The MA5332MS can be ordered now in a PG-IQFN-42 package.