Audio power amplifiers for portable communication devices

24 January 2007 Analogue, Mixed Signal, LSI Fire & Safety

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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