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Details, datasheet, quote on part number:LM4906LDX
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| Part: | LM4906LDX |
| Category: | Multimedia => Audio => Amplifiers => Power Amplifiers => Boomer Audio Power Amplifiers |
| Description: | LM4906 - 1W, Bypass-capacitor-less Audio Power Amplifier With Internal Selectable Gain, Package: Llp, Pin Nb=10 |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM4906LDX datasheet File size : 480 kB |
| Request For quote: | Find where to buy LM4906LDX
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Datasheet text preview:
LM4906 1W, Bypass-Capacitor-less Audio Amplifier with Internal Selectable Gain
May 2003
LM4906 1W, Bypass-Capacitor-less Audio Amplifier with Internal Selectable Gain
General Description
The LM4906 is an audio power amplifier primarily designed for demanding applications in mobile phones and other portable communication device applications. It is capable of delivering 1W of continuous average power to an 8 BTL load with less than 1% distortion (THD+N) from a +5V power supply. The LM4906 is the first National Semiconductor Boomer Power Amplifier that does not require an external PSRR bypass capacitor. The LM4906 also has an internal selectable gain of either 6dB or 12dB. In addition, no output coupling capacitors or bootstrap capacitors are required which makes the LM4906 ideally suited for cell phone and other low voltage portable applications. The LM4906 contains advanced pop and click circuitry that eliminates noise, which would otherwise occur during turn-on and turn-off transitions. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4906 features a low -power consumption shutdown mode (the part is enabled by pulling the SD pin high). Additionally, the LM4906 features an internal thermal shutdown protection mechanism.
Key Specifications
j Improved PSRR at 217Hz for +3V j Power Output at +5V, THD+N = 1%, 8 j Total shutdown power supply current
71dB 1.0W (typ) 0.1µA (typ)
j Power Output at +3V, THD+N = 1%, 8 390mW (typ)
Features
n n n n n n n n Selectable gain of 6dB (2V/V) or 12dB (4V/V) No output or PSRR bypass capacitors required Improved "Click and Pop" suppression circuitry Very fast turn on time: 5ms (typ) Minimum external components 2.6 - 5.5V operation BTL output can drive capacitive loads Ultra low current shutdown mode (SD Low)
Applications
n Portable computers n Desktop computers n Multimedia monitors
Typical Application
200571B9
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer ® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation
DS200571
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LM4906
Connection Diagrams
MSOP Package MSOP Marking
20057102
200571F1
Top View Order Number LM4906MM See NS Package Number MUB08A LLP Package
Z - Plant Code X - Date Code T - Die Traceability LD Marking
200571F2
Z - Plant Code XY - Date Code T - Die Traceability
200571C3
Top View Order Number LM4906LD See NS Package Number LDA10B
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LM4906
Absolute Maximum Ratings
(Note 2)
Thermal Resistance JC (MSOP) JA (MSOP) JC (LLP) JA (LLP) 56°C/W 190°C/W 12°C/W 63°C/W
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (Note 10) Storage Temperature Input Voltage Power Dissipation (Notes 3, 11) 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
Operating Ratings
Temperature Range TMIN TA TMAX Supply Voltage -40°C TA 85°C 2.6V VDD 5.5V
Electrical Characteristics VDD = 5V (Notes 1, 2) The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for TA = 25°C.
LM4906 Symbol Parameter Conditions VIN = 0V, Io = 0A, No Load VIN = 0V, Io = 0A, 8 Load VSD = GND THD+N = 1% (max); f = 1 kHz RL = 8 Po = 0.4 Wrms; f = 1kHz Vripple = 200mV sine p-p Input terminated with 10 Gain at 6dB SD Pin High = Part On SD Pin Low = Part Off Typical (Note 6) IDD ISD VOS Po TWU THD+N PSRR VSDIH VSDIL Quiescent Power Supply Current Shutdown Current Output Offset Voltage Output Power Wake-up time Total Harmonic Distortion+Noise Power Supply Rejection Ratio Shutdown Voltage Input High Shutdown Voltage Input Low 3.5 4 0.1 7 1.0 5 0.2 67 (f = 217Hz) 70 (f = 1kHz) 1.5 1.3 Limit (Notes 7, 8) 7 8 2 35 0.9 Units (Limits) mA (max) mA (max) µA (max) mV (max) W (min) ms % dB V (min) V (max)
Electrical Characteristics VDD = 3V (Notes 1, 2) The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for TA = 25°C.
LM4906 Symbol Parameter Conditions VIN = 0V, Io = 0A, No Load VIN = 0V, Io = 0A, 8 Load VSD = GND THD+N = 1% (max); f = 1 kHz RL = 8 Po = 0.15 Wrms; f = 1kHz Vripple = 200mV sine p-p Input terminated with 10 Gain at 6dB SD Pin High = Part On SD Pin Low = Part Off Typical (Note 6) IDD ISD VOS Po TWU THD+N PSRR VSDIH VSDIL Quiescent Power Supply Current Shutdown Current Output Offset Voltage Output Power Wake-up time Total Harmonic Distortion+Noise Power Supply Rejection Ratio Shutdown Voltage Input High Shutdown Voltage Input Low 2.6 3 0.1 7 390 4 0.1 71 (f = 217Hz) 73 (f = 1kHz) 1.1 0.9 Limit (Notes 7, 8) 6 7 2 35 Units (Limits) mA (max) mA (max) µA (max) mV (max) mW ms % dB V (min) V (max)
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