PDF LM4951A Data sheet ( Hoja de datos )

Número de pieza	LM4951A
Descripción	Wide Voltage Range 1.8 Watt Audio Amplifier
Fabricantes	National Semiconductor
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No Preview Available ! September 5, 2008 LM4951A Wide Voltage Range 1.8 Watt Audio Amplifier With Short Circuit Protection General Description The LM4951A is an audio power amplifier designed for ap- plications with supply voltages ranging from 2.7V up to 9V. The LM4951A is capable of delivering 1.8W continuous av- erage power with less than 1% THD+N into a bridge connect- ed 8Ω load when operating from a 7.5VDC power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4951A does not require boot- strap capacitors, or snubber circuits. The LM4951A features a low-power consumption active-low shutdown mode. Additionally, the LM4951A features an in- ternal thermal shutdown protection mechanism and short circuit protection. The LM4951A contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4951A is unity-gain stable and can be configured by external gain-setting resistors. Key Specifications Features ■ Pop & click circuitry eliminates noise during turn-on and turn-off transitions ■ Wide supply voltage range: 2.7V to 9V ■ Low current, active-low shutdown mode ■ Low quiescent current ■ Thermal shutdown protection ■ Short circuit protection ■ Unity-gain stable ■ External gain configuration capability Applications ■ Portable devices ■ Cell phones ■ Laptop computers ■ Computer speaker systems ■ MP3 player speakers ■ Wide Voltage Range ■ Quiescent Power Supply Current (VDD = 7.5V) ■ Power Output BTL at 7.5V, 1% THD ■ Shutdown Current ■ Fast Turn on Time 2.7V to 9V 2.5mA (typ) 1.8W (typ) 0.01µA (typ) 25ms (typ) Boomer® is a registered trademark of National Semiconductor Corporation. © 2008 National Semiconductor Corporation 300578 www.DataSheet.in www.national.com 1 page Absolute Maximum Ratings (Notes 1, 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Rating (Note 4) ESD Rating (Note 5) Junction Temperature (TJMAX) 9.5V −65°C to +150°C −0.3V to VDD + 0.3V Internally limited 2000V 200V 150°C Thermal Resistance θJA (LLP) (Note 3) Soldering Information See AN-1187 'Leadless Leadframe Packaging (LLP).' 73°C/W Operating Ratings (Notes 1, 2) Temperature Range TMIN ≤ TA ≤ TMAX Supply Voltage −40°C ≤ T A ≤ +85°C 2.7V ≤ VDD ≤ 9V Electrical Characteristics VDD = 7.5V (Notes 1, 2) The following specifications apply for VDD = 7.5V, AV-BTL = 6dB, RL = 8Ω unless otherwise specified. Limits apply for TA = 25°C. Symbol Parameter Conditions LM4951A Typical (Note 6) Limit (Note 7) Units (Limits) IDD ISD VOS VSDIH VSDIL RPULLDOWN TWU TSD TSD Quiescent Power Supply Current Shutdown Current Output Offset Voltage Shutdown Voltage Input High Shutdown Voltage Input Low Pull-down Resistor on SD pin Wake-up Time Shutdown time Thermal Shutdown Temperature VIN = 0V, IO = 0A, RL = 8Ω BTL VSD = GND (Note 8) CB = 1.0µF CB = 1.0µF 2.5 4.5 mA (max) 0.01 5 µA (max) 5 30 mV (max) 1.2 V (min) 0.4 V (max) 75 45 kΩ (min) 25 35 ms (max) 10 ms (max) 170 150 °C (min) 190 °C (max) PO THD+N Output Power Total Harmonic Distortion + Noise THD = 1% (max); f = 1kHz RL = 8Ω Mono BTL PO = 600mWRMS; f = 1kHz AV-BTL = 6dB PO = 600mWRMS; f = 1kHz AV-BTL = 26dB 1.8 1.5 W (min) 0.07 0.5 % (max) 0.35 % εOS Output Noise A-Weighted Filter, Ri = Rf = 20kΩ Input Referred (Note 9) 10 µV PSRR Power Supply Rejection Ratio VRIPPLE = 200mVp-p, f = 217Hz, 66 56 dB (min) CB = 1.0μF, Input Referred Electrical Characteristics VDD = 3.3V (Notes 1, 2) The following specifications apply for VDD = 3.3V, AV-BTL = 6dB, RL = 8Ω unless otherwise specified. Limits apply for TA = 25°C. Symbol Parameter Conditions LM4951A Typical (Note 6) Limit (Note 7) Units (Limits) IDD ISD VOS VSDIH VSDIL TWU TSD Quiescent Power Supply Current Shutdown Current Output Offset Voltage Shutdown Voltage Input High Shutdown Voltage Input Low Wake-up Time Shutdown time VIN = 0V, IO = 0A, RL = 8Ω BTL VSHUTDOWN = GND (Note 8) CB = 1.0µF CB = 1.0µF 2.5 0.01 3 25 4.5 mA (max) 2 µA (max) 30 mV (max) 1.2 V (min) 0.4 V (max) ms 10 ms (max) www.DataSheet.in 5 www.national.com 5 Page Power Dissipation vs Output Power VDD = 3.3V, RL = 8Ω, f = 1kHz Power Dissipation vs Output Power VDD = 7.5V, RL = 8Ω, f = 1kHz 30057825 Supply Current vs Supply Voltage RL = 8Ω, VIN = 0V, Rsource = 50Ω 30057826 Clipping Voltage vs Supply Voltage RL = 8Ω, from top to bottom: Negative Voltage Swing; Positive Voltage Swing 30057827 Output Power vs Supply Voltage RL = 8Ω, from top to bottom: THD+N = 10%, THD+N = 1% 300578e9 Output Power vs Load Resistance VDD = 3.3V, f = 1kHz from top to bottom: THD+N = 10%, THD+N = 1% www.DataSheet.in 300578f0 11 300578f1 www.national.com 11 Page

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