7x7mm chip delivers 2x100W stereo

Infineon has created a 7 x 7mm multi-chip module that can deliver two audio channels of up to 100W each.

Called MA5332MS, the company claims 95% power efficiency for the Class-D amplifier when driving that power into 4Ω loads (10% THD+N, ±36.5V supply). Looking at the data sheet, up to 90W is available with <0.1% THD+N. Providing the load is 1W, THD+N remains below 0.1% up to 20kHz – the data sheet is your friend here.

Heatsinking is necessary for operation at this power level for more than a minute.

Single (pictured) or split supply operation is possible – recommended total supply voltage is 80V with a heatsink and 60V without (load unspecified).

As well as the power-side supply or supplies, a ~10V rail is needed to supply internal circuits, plus ±5V low-noise rails for the input circuitry.

Inside the 1mm high package are the following die: a dual-channel PWM controller, a gate driver and four 24.4mΩtyp n-channel mosfets.

The two outputs can be bridged to deliver more voltage to a single loudspeaker, or paralleled to deliver more current to a single speaker – for example for sub-woofers, said the company.

Inputs are analogue, and differential for connection flexibility.

Features include start and stop click noise reduction, and reporting of clipping and faults. Protections include over-current, over-temperature and under-voltage – with self-resetting

EVAL_AUDAMP25 (right) is a two-channel evaluation board that implements the 2 x 200W into 4Ω ±36.5V set-up with a heatsink. “This design does not require an additional heatsink or fan cooling for normal operation – one-eighth of continuous rated power,” according to Infineon.