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LM4854 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM4854 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 29 page  LM4854 1.9W Monaural, 85mW Stereo Headphone Audio Amplifier General Description The unity-gain stable LM4854 is both a mono differential output (for bridge-tied loads, or BTL) audio power amplifier and a single-ended (SE) stereo headphone amplifier. Oper- ating on a single 5V supply, the mono BTL mode delivers 1.1W (typ) to an 8 Ω load, 1.7W (typ) to a 4Ω load (Note 1) at 1% THD+N. In SE stereo mode, the amplifier will deliver 85mW to 32 Ω loads. The LM4854 features a new circuit topology that suppresses output transients (’click and pops’) and eliminates SE-mode output coupling capacitors, saving both component and board space costs. The LM4854 has three inputs: one pair for a two-channel stereo signal and the third for a single-channel mono input. The LM4854 is designed for PDA, cellular telephone, note- book, and other handheld portable applications. It delivers high quality output power from a surface-mount package and requires few external components. Other features include an active-low micropower shutdown mode, an "instant-on" low power standby mode, and thermal shutdown protection. The LM4854 is available in the very space-efficient 12-lead micro SMD, exposed-DAP LLP for higher power applica- tions, and TSSOP packages. Note 1: An LM4854LD that has been properly mounted to a circuit board will deliver 1.7W (typ) into a 4 Ω load. Key Specifications j LLP BTL output power (RL = 3.2 Ω and THD+N = 1%) V DD = 3.0V 1.0W (typ) V DD = 5.0V 1.9W (typ) j LLP BTL output power (RL =4 Ω and THD+N = 1%) V DD = 3.0V 900mW (typ) V DD = 5.0V 1.7W (typ) j LLP BTL output power (RL =8 Ω and THD+N = 1%) V DD = 3.0V 380mW (typ) V DD = 5.0V 1.1W (typ) j SE output power (RL =32 Ω and THD+N = 1.0%) V DD = 3.0V 32mW (typ) V DD = 5.0V 93mW (typ) j Micropower shutdown supply current V DD = 3.0V 0.005µA (typ) V DD = 5.0V 0.05µA (typ) j Standby supply current V DD = 3.0V 16µA (typ) V DD = 5.0V 27µA (typ) j PSRR (f = 1kHz, 3.0V ≤ V DD ≤ 5.0V, (Fig. 1)) BTL 60dB (typ) SE 66dB (typ) Features n Fast 0.1ms (typ) and 1.0ms (max) turn-on and turn-off time n Eliminates SE amplifier output coupling capacitors n Advanced "click and pop" suppression circuitry n Stereo headphone amplifier mode n Low-power standby and ultra-low current micropower shutdown modes n Thermal shutdown protection circuitry n 2.4V to 5.5V operation n Unity-gain stable n Gain set with external resistors n Space-saving micro SMD package, exposed-DAP LLP, and TSSOP Applications n PDAs n Notebook computers n Cellular phones n Handheld portable electronic devices Boomer® is a registered trademark of National Semiconductor Corporation. April 2003 © 2003 National Semiconductor Corporation DS200382 www.national.com |
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