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LM4665 データシート(PDF) 1 Page - Texas Instruments |
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LM4665 データシート(HTML) 1 Page - Texas Instruments |
1 / 28 page LM4665 www.ti.com SNAS146E – FEBRUARY 2002 – REVISED MAY 2013 LM4665 Filterless High Efficiency 1W Switching Audio Amplifier Check for Samples: LM4665 1 FEATURES DESCRIPTION The LM4665 is a fully integrated single-supply high 2 • No Output Filter Required for Inductive efficiency switching audio amplifier. It features an Transducers innovative modulator that eliminates the LC output • Selectable Gain of 6dB (2V/V) or 12dB (4V/V) filter used with typical switching amplifiers. • Very Fast Turn On Time: 5ms (typ) Eliminating the output filter reduces parts count, simplifies circuit design, and reduces board area. The • User Selectable Shutdown High or Low Logic LM4665 processes analog inputs with a delta-sigma Level modulation technique that lowers output noise and • Minimum External Components THD when compared to conventional pulse width • "Click and Pop" Suppression Circuitry modulators. • Micro-Power Shutdown Mode The LM4665 is designed to meet the demands of mobile phones and other portable communication • Short Circuit Protection devices. Operating on a single 3V supply, it is • DSBGA, WSON, and VSSOP Packages (No capable of driving 8 Ω transducer loads at a Heat Sink Required) continuous average output of 400mW with less than 2%THD+N. APPLICATIONS The LM4665 has high efficiency with an 8 Ω • Mobile Phones transducer load compared to a typical Class AB • PDAs amplifier. With a 3V supply, the IC's efficiency for a 100mW power level is 75%, reaching 80% at 400mW • Portable Electronic Devices output power. KEY SPECIFICATIONS The LM4665 features a low-power consumption shutdown mode. Shutdown may be enabled by either • Efficiency at 100mW into 8 Ω Transducer a logic high or low depending on the mode selection. 75%(typ) Connecting the Shutdown Mode pin to either VDD • Efficiency at 400mW into 8 Ω Transducer (high) or GND (low) enables the Shutdown pin to be 80%(typ) driven in a likewise manner to activate shutdown. • Total Quiescent Power Supply Current (3V) The LM4665 has fixed selectable gain of either 6dB 3mA(typ) or 12dB. The LM4665 has short circuit protection • Total Shutdown Power Supply Current (3V) against a short from the outputs to VDD, GND or across the outputs. 0.01µA(typ) • Single Supply Range (VSSOP & WSON) 2.7V to 5.5V • Single Supply Range (DSBGA) (Note 11) 2.7V to 3.8V 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2002–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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