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LM4927 Dataheets PDF



Part Number LM4927
Manufacturers National Semiconductor
Logo National Semiconductor
Description 2.5 Watt Fully Differential Audio Power Amplifier
Datasheet LM4927 DatasheetLM4927 Datasheet (PDF)

LM4927 2.5 Watt Fully Differential Audio Power Amplifier With Shutdown April 2006 LM4927 2.5 Watt Fully Differential Audio Power Amplifier With Shutdown General Description The LM4927 is a fully differential audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 2.5 watts of continuous average power to a 4Ω load with less than 10% distortion (THD+N) from a 5VDC power supply. Boomer a.

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LM4927 2.5 Watt Fully Differential Audio Power Amplifier With Shutdown April 2006 LM4927 2.5 Watt Fully Differential Audio Power Amplifier With Shutdown General Description The LM4927 is a fully differential audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 2.5 watts of continuous average power to a 4Ω load with less than 10% distortion (THD+N) from a 5VDC power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4927 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement. The LM4927 features a low-power consumption shutdown mode. To facilitate this, Shutdown may be enabled by logic low. Additionally, the LM4927 features an internal thermal shutdown protection mechanism. The LM4927 contains advanced pop & click circuitry which eliminates noises which would otherwise occur during turn-on and turn-off transitions. Key Specifications j Improved PSRR at 217Hz j Power Output at 5.0V @ 10% THD (4Ω) j Power Output at 3.3V @ 1% THD j Shutdown Current 85dB (typ) 2.5W (typ) 550mW (typ) 0.1µA (typ) Features Fully differential amplification Available in space-saving micro-array LLP package Ultra low current shutdown mode Can drive capacitive loads up to 100pF Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions n 2.4 - 5.5V operation n No output coupling capacitors, snubber networks or bootstrap capacitors required n n n n n Applications n Mobile phones n PDAs n Portable electronic devices Typical Application 20152529 FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® is a registered trademark of National Semiconductor Corporation. © 2006 National Semiconductor Corporation DS201525 www.national.com LM4927 Connection Diagrams 8 Pin LLP Package 20152563 Top View Order Number LM4927SD See NS Package Number SDA08A 8 Pin LLP Marking 20152565 Top View Z = Assembly Plant XY = 2 Digit Date Code TT = Die Traceability L4927 = LM4927SD www.national.com 2 LM4927 Absolute Maximum Ratings (Note 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 Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature 6.0V −65˚C to +150˚C −0.3V to VDD +0.3V Internally Limited 2000V 200V 150˚C Thermal Resistance θJA (SD) Soldering Information See AN-1187 63˚C/W Operating Ratings Temperature Range TMIN ≤ TA ≤ TMAX Supply Voltage −40˚C ≤ TA ≤ 85˚C 2.4V ≤ VDD ≤ 5.5V Electrical Characteristics VDD = 5V (Notes 1, 2) The following specifications apply for VDD = 5V, AV = 1, and 8Ω load unless otherwise specified. Limits apply for TA = 25˚C. LM4927 Symbol IDD ISD Parameter Quiescent Power Supply Current Shutdown Current Conditions VIN = 0V, no load VIN = 0V, RL = 8Ω VSHUTDOWN = GND THD = 1% (max); f = 1 kHz RL = 4Ω RL = 8Ω THD = 10% (max); f = 1 kHz RL = 4Ω RL = 8Ω Po = 1 Wrms; f = 1kHz Vripple = 200mV sine p-p PSRR CMRR VOS VSDIH VSDIL SNR RF AV TWU Power Supply Rejection Ratio Common-Mode Rejection Ratio Output Offset Shutdown Voltage Input High Shutdown Voltage Input Low Signal-to-noise ratio Internal Feedback Resistance Gain Wake-up time from Shutdown PO = 1W, f = 1kHz Ri = 40kΩ Ri = 40kΩ Cbypass = 1µF 110 40 0 14 37 47 –0.68 1.4 f = 217Hz (Note 8) f = 1kHz (Note 8) f = 217Hz, VCM = 200mVpp VIN = 0V 90 85 60 4 1.4 0.4 71 dB (min) dB mV V (min) V (max) dB kΩ (min) kΩ (max) dB (min) dB (max) ms Typical (Note 6) 2.2 2.2 0.1 2.1 1.30 2.5 1.6 0.03 Limit (Note 7) 4.5 4.5 1 Units (Limits) mA (max) µA (max) Po Output Power 1.20 W (min) W % THD+N Total Harmonic Distortion+Noise Electrical Characteristics VDD = 3V (Notes 1, 2) The following specifications apply for VDD = 3V, AV = 1, and 8Ω load unless otherwise specified. Limits apply for TA = 25˚C. LM4927 Symbol IDD ISD Parameter Quiescent Power Supply Current Shutdown Current Conditions VIN = 0V, no load VIN = 0V, RL = 8Ω VSHUTDOWN = GND Typical (Note 6) 2 2 0.1 Limit (Note 7) 4.3 4.3 1 Units (Limits) mA (max) µA (max) 3 www.national.com LM4927 Electrical Characteristics VDD = 3V (Notes 1, 2) The following specifications apply for VDD = 3V, AV = 1, and 8Ω load unless otherwise specified. Limits apply for TA = 25˚C. (Continued) LM4927 Symbol Parameter Conditions THD = 1% (max); f = 1 kHz RL = 4Ω RL = 8Ω THD = 10% (max); f = 1 kHz RL = 4Ω RL = 8Ω Po = 0.25Wrms; f = 1kHz Vripple = 200mV sine p-p PSRR CMRR VOS VSDIH VSDIL TWU Power Supply Rejection Ratio Common-Mode Rejection Ratio Output Offset Shutdown Voltage Input High Shutdown Voltage Input Low Wake-up time.


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