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LM4924

National Semiconductor
Part Number LM4924
Manufacturer National Semiconductor
Description Stereo Headphone Audio Amplifier
Published Sep 24, 2005
Detailed Description LM4924 2 Cell Battery, 40mW Per Channel Output Capacitor-Less (OCL) Stereo Headphone Audio Amplifier October 2004 LM49...
Datasheet PDF File LM4924 PDF File

LM4924
LM4924

Overview
LM4924 2 Cell Battery, 40mW Per Channel Output Capacitor-Less (OCL) Stereo Headphone Audio Amplifier October 2004 LM4924 2 Cell Battery, 40mW Per Channel Output Capacitor-Less (OCL) Stereo Headphone Audio Amplifier General Description The LM4924 is a Output Capacitor-Less (OCL) stereo headphone amplifier, which when connected to a 3.
0V supply, delivers 40mW per channel to a 16Ω load with less than 1% THD+N.
With the LM4924 packaged in the MM and SD packages, the customer benefits include low profile and small size.
These packages minimizes PCB area and maximizes output power.
The LM4924 features circuitry that reduces output transients (“clicks” and “pops”) during device turn-on and turn-off, and Mute On and Off.
An externally controlled, low-power consumption, active-low shutdown mode is also included in the LM4924.
Boomer audio power amplifiers are designed specifically to use few external components and provide high quality output power in a surface mount packages.
Key Specifications n n n n n OCL output power (RL = 16Ω, VDD = 3.
0V, THD+N = 1%) 40mW (typ) Micropower shutdown current 0.
1µA (typ) Supply voltage operating range 1.
5V < VDD < 3.
6V PSRR 100Hz, VDD = 3.
0V, AV = 2.
5 66dB (typ) Features 2-cell 1.
5V to 3.
6V battery operation OCL mode for stereo headphone operation Unity-gain stable “Click and pop” suppression circuitry for shutdown On and Off transients n Active low micropower shutdown n Thermal shutdown protection circuitry n n n n Applications n Portable two-cell audio products n Portable two-cell electronic devices Typical Application 20121057 FIGURE 1.
Block Diagram Boomer ® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS201210 www.
national.
com LM4924 Connection Diagrams MSOP Package MSOP Marking 20121006 20121058 Top View Order Number LM4924MM See NS Package Number MUB10A for MSOP SD Package Z- Plant Code X - Date Code T - Die Traceability G - Boomer Family B7 - LM4924MM ...


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