Filterless Class-D Audio Amp suits portable applications.
Press Release Summary:
From 5 V supply, NCP2820 delivers up to 2.65 W of continuous average power into 4 ohm bridge-tied load (BTL). Under same conditions, output power stage can provide 1.4 W into 8 ohm BTL load with less than 1% total harmonic distortion plus noise. Product has 2.5-5.5 V input voltage range and drives clean audio output. Featuring 90% power efficiency and shutdown current of 0.42 µA, unit does not require output filter when using inductive transducers.
Original Press Release:
ON Semiconductor Introduces a 2.65-Watt Filterless Class-D Audio Amplifier with Superior Efficiency and Sound Quality for Portable Applications
The NCP2820 delivers a power efficient, cost-effective solution for driving the loudspeaker for hands-free, high-power, melody ringer and other multimedia functions in a cell phone
PHOENIX, Ariz. - June 17, 2005 - Expanding its audio amplifier portfolio, ON Semiconductor (Nasdaq: ONNN) today introduced the NCP2820 - a cost-effective, filterless Class-D audio amplifier designed for portable applications such as cell phones, digital cameras, portable media players, notebook PCs, LCD monitors, and other handheld devices. NCP2820 enhances the highest audio amplification power with the minimum board space, and extends battery life thanks to its high efficiency and low shutdown current.
Features and Benefits
From a 5 volt (V) supply, the NCP2820 is capable of delivering 2.65 watts (W) of continuous average power into a 4 ohm bridge-tied load (BTL). Under the same conditions, the output power stage can provide 1.4 W into an 8 ohm BTL load with less than 1 percent Total Harmonic Distortion plus Noise (THD+N). For a device in a small 1.45 mm x 1.45mm, Flip-Chip, chip-scale package (CSP) and an input voltage range of 2.5 V to 5.5 V, the NCP2820 drives clean audio output with the highest power in the market. The device offers space and cost savings because no output filter is required when using inductive transducers. With up to 90 percent power efficiency and a very low shutdown current of typically 0.42 micro amps (µA), this audio amplifier reduces battery drain and drastically lowers the junction temperature, hence reducing heat dissipation within compact portable devices.
Utilizing a pulse width modulation (PWM) technique, the NCP2820 processes analog input while keeping output noise and THD low. The "pop and click" noise elimination circuitry ensures that no audible noise will be produced during start-up or shut-down. Thus the device can be turned to shutdown mode during the long idle times to reduce power consumption. Due to its low 42 microvolts (µV) noise floor, using an A-weighted filter guarantees clean audio output regardless of the load sensitivity.
"ON Semiconductor offers a focused audio amplifier portfolio for cell phone handsets and other portable devices that includes various highly integrated, high quality Class AB speaker amplifiers, stereo headphone amplifiers, as well as earpiece/receiver amplifiers," said Andy Williams, ON Semiconductor vice president Power Conversion Products. "With a competitive pricing strategy, ON Semiconductor offers world class audio amplifier solutions with high efficiency and quality output sound that are globally used in millions of handsets each year. With the experience we've gained from the global headset leaders, the company will continue to manufacture high-quality audio amplifiers for cell phone as well as other battery operating devices."
Packaging and Price
The NCP2820 is offered in a 1.45 mm x 1.45 mm, 9-pin Flip-Chip CSP and priced at $0.68 per unit in 1000 unit quantities. A lead-free NCP2820 is also available.
For additional information, please visit www.onsemi.com/tech or contact Crystal Lam at Crystal.Lam@onsemi.com .
About ON Semiconductor
With its global logistics network and strong portfolio of power semiconductor devices, ON Semiconductor (Nasdaq: ONNN) is a preferred supplier of power solutions to engineers, purchasing professionals, distributors and contract manufacturers in the computer, cell phone, portable devices, automotive and industrial markets. For more information, please visit ON Semiconductor's website at www.onsemi.com.
ON Semiconductor and the ON Semiconductor logo are registered trademarks of Semiconductor Components Industries, LLC. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. Although the company references its website in this news release, such information on the website is not to be incorporated herein.
