Audio power amplifiers for portable communication devices

24 January 2007 Analogue, Mixed Signal, LSI

ON Semiconductor has introduced two new audio power amplifiers capable of delivering higher output power than previous generations. The NCP2892 and NCP2990 are 1,3 W audio amplifiers that feature fast turn-on time and minimal power consumption.

Designed for portable communication devices requiring quality audio, they produce zero pop-and-click noise. The NCP2892 is optimised to eliminate pop-and-click noise with differential audio input while the NCP2990 demonstrates the same zero pop noise feature with single-ended audio input.

For maximum design flexibility, the NCP2892 and NCP2990 feature an externally controlled turn-on time. When using a 1 mF bypass capacitor, the NCP2892 offers 100 ms wake-up time. Both devices offer minimum turn-on time down to 15 ms to 30 ms. The NCP2892 and NCP2990 devices can be connected directly to the battery, eliminating the use of an LDO or DC-DC converter.

The chips offer 1,3 W into an 8,0 Ω load from a 5,0 V power supply (2,2 to 5,5 V operation) and draw only 10 nA in ultra low current shutdown mode.

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