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LM4925MM Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4925MM Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 15 page  LM4925 2 Cell, Single Ended Output, 40mW Stereo Headphone Audio Amplifier General Description The unity gain stable LM4925 is both a mono differential output (for BTL operation) audio amplifier and a Single Ended (SE) stereo headphone amplifier. Operating on a single 3V supply, the mono-BTL mode delivers 410mW into an 8 Ω load at 1% THD+N. In Single Ended stereo head- phone mode, the amplifier delivers 40mW per channel into a 16 Ω load at 1% THD+N. With the LM4925 packaged in the MM and LLP packages, the customer benefits include low profile and small size. This package minimizes PCB area and maximizes output power. The LM4925 features circuitry that reduces output transients (“clicks” and “pops”) during device turn-on and turn-off, an externally controlled, low-power consumption, active-low shutdown mode, and thermal shutdown. Boomer audio power amplifiers are designed specifically to use few exter- nal components and provide high quality output power in a surface mount package. Key Specifications n Mono-BTL Output Power n (R L =8 Ω,V DD = 3.0V, THD+N = 1%) 410mW (typ) n Single Ended Output Power Per Channel n (R L =16 Ω,V DD = 3.0V, THD+N = 1%) 40mW (typ) n Micropower shutdown current 0.1µA (typ) n Supply voltage operating range 1.5V < V DD < 3.6V n PSRR 100Hz, V DD = 3V, BTL 70dB (typ) Features n BTL mode for mono speaker n 2-cell 1.5V to 3.6V battery operation n Single ended headphone operation with output coupling capacitors n Unity-gain stable n “Click and pop” suppression circuitry for both Shutdown and Mute n Active low micro-power shutdown n Active-low mute mode n Thermal shutdown protection circuitry Applications n Portable two-cell audio products n Portable two-cell electronic devices Typical Application Boomer® is a registered trademark of National Semiconductor Corporation. 20121157 FIGURE 1. Block Diagram February 2005 © 2005 National Semiconductor Corporation DS201211 www.national.com |
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