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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LM4817 데이터시트(PDF) 1 Page - National Semiconductor (TI) |
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LM4817 데이터시트(HTML) 1 Page - National Semiconductor (TI) |
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1 / 21 page  LM4817 1W Stereo Audio Amplifier Plus Adjustable Output Limiter Plus Adjustable LDO General Description The LM4817 combines a bridge-connected (BTL) stereo audio power amplifier with a low dropout voltage regulator (LDO). The audio amplifier delivers 1.0W to a 8 Ω load with a less than 1.0% THD+N while operating on a 5V power supply. With V LIM set to 1.0V, the amplifier outputs are clamped to 6V p-p, ±800mV. With the LM4817’s adjustable low-dropout (LDO) CMOS linear regulator delivers an output current of up to 300mA, has shutdown mode (1nA, typ) low quiescent current (90µA, typ) and LDO voltage (120mV, typ). The regulator is stable with small ceramic capacitive load (2.2µF, typ). The regulator includes regulation fault detection, a bandgap voltage refer- ence, and constant current limiting. It is designed for low power, low current applications that can take advantage of its 300mA output current capability. The LM4817 features an externally controlled micropower shutdown mode and thermal shutdown protection. It also utilizes circuitry that reduces "clicks and pops" during device turn-on and return from shutdown. Boomer audio power amplifiers are designed specifically to use few external components and provide high quality output power in a surface mount package. Key Specifications n P O (BTL): VDD = 5V, THD+N ≤ 1%, R L =8 Ω 1.0W(typ) n Power supply range (amplifier) 3.0V to 5.5V n Power supply range (LDO) 2.5V to 6.0V n Shutdown current 0.07µA (typ) n LDO output current 300mA (min) n LDO dropout voltage (I OUT = 300mA) 120mV (typ) n LDO quiescent supply current 90µA (typ) n LDO shutdown supply current 1nA (typ) n LDO PSRR 60dB n LDO turn-on time 120ms (typ) n LDO ouput noise-voltage 37µV RMS (typ) Features n Stereo BTL amplifier n Adjustable output voltage magnitude limiter n Adjustable LDO regulator n “Click and pop” suppression circuitry n LDO is stable with small-value ceramic output capacitors n Unity-gain stable audio amplifiers n LDO has over-current protection n Thermal shutdown protection circuitry n TSSOP (MH) package Applications n Multimedia monitors n Portable and desktop computers n Portable televisions Connection Diagram 20078129 Top View Order Number LM4817MH See NS Package Number MXA28A for TSSOP Boomer® is a registered trademark of National Semiconductor Corporation. March 2004 © 2004 National Semiconductor Corporation DS200781 www.national.com |
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