LM4805LQ/NOPB National Semiconductor, LM4805LQ/NOPB Datasheet
LM4805LQ/NOPB
Specifications of LM4805LQ/NOPB
LM4805LQ
LM4805LQNOPB
LM4805LQNOPBTR
LM4805LQNOPBTR
LM4805LQTR
Related parts for LM4805LQ/NOPB
LM4805LQ/NOPB Summary of contents
Page 1
... Connection Diagrams LM4805LQ (5x5) Top View Order Number LM4805LQ See NS Package Number LQA28A Boomer ® registered trademark of National Semiconductor Corporation. © 2005 National Semiconductor Corporation Key Specifications j Quiescent Power Supply Current ( Output Power ( ...
Page 2
Typical Application * Cf2 is optional. FIGURE 1. Typical Audio Amplifier Application Circuit www.national.com 20126210 2 ...
Page 3
... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ( Supply Voltage ( Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Electrical Characteristics V The following specifications apply for V wise specified. Limits apply for T = 25˚ ...
Page 4
Electrical Characteristics V The following specifications apply for V wise specified. Limits apply for T = 25˚C. A Symbol Parameter V Feedback Pin Reference Voltage FB Note 1: All voltages are measured with respect to the GND pin, unless otherwise ...
Page 5
Typical Performance Characteristics THD+N vs Frequency 6dB THD+N vs Frequency 26dB THD+N vs Frequency V = 4.2V 6dB ...
Page 6
Typical Performance Characteristics THD+N vs Frequency V = 4.2V 26dB THD+N vs Output Power 6dB THD+N vs Output Power 26dB ...
Page 7
Typical Performance Characteristics THD+N vs Output Power V = 4.2V 6dB THD+N vs Output Power V = 4.2V 26dB Supply Current vs Supply Voltage (Continued) = 8Ω L 20126223 = ...
Page 8
Typical Performance Characteristics Power Dissipation vs Output Power 16Ω 1kHz DD L Power Dissipation vs Output Power V = 4.2V 16Ω 1kHz DD L Output Power vs Load Resistance ...
Page 9
Typical Performance Characteristics Output Power vs Supply Voltage R = 16Ω 1kHz L PSRR vs FREQUENCY 26dB 200mV ripple P-P PSRR vs FREQUENCY V = 4.2V 26dB ...
Page 10
Typical Performance Characteristics Amplifier Frequency Response vs Input Capacitor Size Switch Current Limit vs Duty Cycle - ”X” Feedback Voltage vs Temperature www.national.com (Continued) 20126242 20126243 20126246 10 Amplifier Open Loop vs Frequency Respose 20126241 Oscillator Frequency vs Temperature - ...
Page 11
Typical Performance Characteristics Maximum Duty Cycle vs Temperature - ”X” R (ON Application Information BRIDGE CONFIGURATION EXPLANATION The Audio Amplifier portion of the LM4805 has two internal amplifiers allowing different amplifier configurations. The first amplifier’s gain ...
Page 12
... This plane forms a thermal mass, heat sink, and radiation area. Further detailed and specific information con- cerning PCB layout, fabrication, and mounting an LD (LLP) package is found in National Semiconductor’s Package En- gineering Group under application note AN1187 (2π R ...
Page 13
Application Information tor high value input coupling capacitor requires more i charge to reach its quiescent DC voltage (nominally 1 This charge comes from the output via the feedback DD and is apt to create ...
Page 14
Application Information put ripple. Continuous operation is defined as not allowing the inductor current to drop to zero during the cycle. It should be noted that all boost converters shift over to discontinuous operation as the output load is reduced ...
Page 15
Application Information GENERAL MIXED-SIGNAL LAYOUT RECOMMENDATION This section provides practical guidelines for mixed signal PCB layout that involves various digital/analog power and ground traces. Designers should note that these are only "rule-of-thumb" recommendations and the actual results will depend heavily ...
Page 16
Demonstration Board Layout www.national.com Composite Layer 20126251 Top Layer 20126253 16 ...
Page 17
Demonstration Board Layout (Continued) Silkscreen 20126252 Bottom Layer 20126254 17 www.national.com ...
Page 18
Revision History Rev 1.0 www.national.com Date Description 8/11/05 Changed the project title from 3V, 1W Boosted Amplifier into Low Voltage High Power Audio Power Amplifier (per Nisha P.), then re-released D/S to the WEB. 18 ...
Page 19
... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...