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Details, datasheet, quote on part number:LM4666SD
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| Part: | LM4666SD |
| Category: | Multimedia => Audio => Amplifiers => Power Amplifiers |
| Description: | High Efficiency 1.3W Stereo Amp <<<>>>The LM4666 is a Fully Integrated Single-supply High Efficiency Switching Audio Amplifier. It Features an Innovative Modulator That Eliminates The LC Output Filter Used With Typical Switching Amplifiers. Eliminating The Output Filter Reduces Parts Count, Simplifies Circuit Design, And Reduces Board Area. The LM4666 Processes Analog Inputs With a Delta-sigma Modulation Technique That Lowers Output Noise And THD When Compared to Conventional Pulse Width Modulators. <<<>>><<<>>>The LM4666 is Designed to Meet The Demands of Mobile Phones And Other Portable Communication Devices. Operating on a Single 3V Supply, it is Capable of Driving 8 Transducer Loads at a Continuous Average Output of 450mW With Less Than 1%THD+N. Its Flexible Power Supply Requirements Allow Operation From 2.8V to 5.5V. <<<>>><<<>>>The LM4666 Has High Efficiency With an 8 Transducer Load Compared to a Typical Class ab Amplifier. With a 3V Supply, The Ic's Efficiency For a 100mW Power Level is 79%, Reaching 84% at 450mW Output Power.<<<>>><<<>>>the LM4666 Features a Low-power Consumption Shutdown Mode. Shutdown May be Enabled BY Driving The Shutdown Pin to a Logic Low (GND).<<<>>><<<>>>The LM4666 Has Fixed Selectable Gain of Either 6dB or 12dB. The LM4666 Has Short Circuit Protection Against a Short From The Outputs to VDD or GND.<<<>>> <<<>>><<<>>>Features<<<>>>No Output Filter Required For Inductive Transducers <<<>>>Selectable Gain of 6dB or 12dB <<<>>>Very Fast Turn on Time: 6ms (typ) <<<>>>Minimum External Components <<<>>>"Click And Pop" Suppression Circuitry <<<>>>Micro-power Shutdown Mode <<<>>>Short Circuit Protection <<<>>>Available in Space-saving Sda Package |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM4666SD datasheet File size : 658 kB |
| Request For quote: | Find where to buy LM4666SD
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Datasheet text preview:
LM4666 Filterless High Efficiency Stereo 1.2W Switching Audio Amplifier
May 2004
LM4666 Filterless High Efficiency Stereo 1.2W Switching Audio Amplifier
General Description
The LM4666 is a fully integrated single-supply high efficiency switching audio amplifier. It features an innovative modulator that eliminates the LC output filter used with typical switching amplifiers. Eliminating the output filter reduces parts count, simplifies circuit design, and reduces board area. The LM4666 processes analog inputs with a delta-sigma modulation technique that lowers output noise and THD when compared to conventional pulse width modulators. The LM4666 is designed to meet the demands of mobile phones and other portable communication devices. Operating on a single 3V supply, it is capable of driving 8 transducer loads at a continuous average output of 450mW with less than 1%THD+N. Its flexible power supply requirements allow operation from 2.8V to 5.5V. The LM4666 has high efficiency with an 8 transducer load compared to a typical Class AB amplifier. With a 3V supply, the IC's efficiency for a 100mW power level is 79%, reaching 84% at 450mW output power. The LM4666 features a low-power consumption shutdown mode. Shutdown may be enabled by driving the Shutdown pin to a logic low (GND). The LM4666 has fixed selectable gain of either 6dB or 12dB. The LM4666 has short circuit protection against a short from the outputs to VDD or GND.
Key Specifications
j Efficiency at 3V, 100mW into 8 transducer 79% (typ) j Efficiency at 3V, 450mW into 8 transducer 84% (typ) j Efficiency at 5V, 1W into 8 transducer j Total quiescent power supply current j Total shutdown power supply current j Single supply range
85% (typ) 7.0mA (typ) 0.02µA (typ) 2.8V to 5.5V
Features
n n n n n n n n No output filter required for inductive transducers Selectable gain of 6dB or 12dB Very fast turn on time: 6ms (typ) Minimum external components "Click and pop" suppression circuitry Micro-power shutdown mode Short circuit protection Available in space-saving SDA package
Applications
n Mobile phones n PDAs n Portable electronic devices
Typical Application
200558E6
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer ® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation
DS200558
www.national.com
LM4666
Connection Diagrams
SDA Package
200558I8
Top View Order Number LM4666SDA See NS Package Number SDA14A SDA Marking
200558I9
Top View Z -- Plant Code XY -- Date Code TT -- Die Traceability L4666 -- LM4666
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LM4666
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 (Note1) Storage Temperature Voltage at Any Input Pin Power Dissipation (Note 3) ESD Susceptibility, pins 4, 7, 11, 14 (Note 4) ESD Susceptibility, all other pins (Note 4) ESD Susceptibility (Note 5) 6.0V -65°C to +150°C VDD + 0.3V V GND - 0.3V Internally Limited 1kV 2.0kV 200V
Junction Temperature (TJ) Thermal Resistance JA (SDA) JC (SDA) Soldering Information See AN-1112 "microSMD Wafers Level Chip Scale Package."
150°C 63°C/W 12°C/W
Operating Ratings (Notes 1, 2)
Temperature Range TMIN TA TMAX Supply Voltage -40°C TA 85°C 2.8V VDD 5.5V
Electrical Characteristics VDD = 5V (Notes 1, 2) The following specifications apply for VDD = 5V and RL = 15µH + 8 + 15µH unless otherwise specified. Limits apply for TA = 25°C.
LM4666 Symbol IDD ISD VSDIH VSDIL VGSIH VGSIL AV AV VOS TWU Po Parameter Quiescent Power Supply Current Shutdown Current Shutdown Voltage Input High Shutdown Voltage Input Low Gain Select Input High Gain Select Input Low Closed Loop Gain Closed Loop Gain Output Offset Voltage Wake-up Time Output Power THD = 1% (max), f = 1kHz, 22kHz BW PO = 100mWRMS/Channel, fIN = 1kHz, 22kHz BW, Both channels in phase PO = 100mWRMS, f = 1kHz VGain VGain
Select Select
Conditions VIN = 0V, No Load VIN = 0V, RL = 15µH + 8 + 15µH VSD = GND (Note 9)
Typical (Note 6) 15 16 0.02 1.2 1.1 1.2 1.1
Limit (Notes 7, 8)
Units (Limits) mA mA µA V V V V dB dB mV ms W
VGain VGain
Select Select
= VDD = GND
6 12 10 6 1.2
THD+N XTALK RIN
Total Harmonic Distortion+Noise Channel Separation Differential Input Resistance
0.65 57 90 60 60
% dB k k dB
= VDD = GND
PSRR
Power Supply Rejection Ratio
VRipple = 100mVRMS sine wave, fRIPPLE = 217Hz Inputs terminated to AC GND VRipple = 100mVRMS sine wave, fRIPPLE = 217Hz POUT = 10mW,1kHz VRipple = 100mVRMS, fRipple = 217Hz, Input referred PO = 1WRMS; A-Weighted Filter A-Weighted filter, Vin = 0V
65
dB
CMRR SNR eOUT
Common Mode Rejection Ratio Signal to Noise Ratio Output Noise
48 83 200
dB dB µV
3
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