LM4917 Datasheet | National Semiconductor

Description The LM4917 is a stereo, output capacitor-less headphone amplifier capable of delivering 95m W of continuous average power into a 16Ω load with less than 1% THD+N from a single 3V power supply. The LM4917 provides high quality audio reproduction with minimal external ponents. A ground referenced output eliminates the output coupling capacitors typically required by single-ended loads, reducing ponent count, cost and board space consumption. This makes the LM4917 ideal for mobile phones and other portable equipment where board space is at a premium. Eliminating the output coupling capacitors also improves low frequency response. The LM4917 operates from a single 1.4V to 3.6V power supply, features low 0.02% THD+N and 70d B PSRR. Independent right/left channel low-power shutdown controls provide power saving flexibility for mono/stereo applications. Superior click and pop suppression eliminates audible transients during start up and shutdown. Short circuit and thermal overload protection protects the device during fault conditions. Key Specifications j Improved PSRR at 1k Hz j Power Output at VDD = 3V, 70d B (typ) 95m W (typ) 0.01µA (typ) RL = 16Ω, THD % 1% j Shutdown Current Features Ground referenced outputs High PSRR Available in space-saving TSSOP package Ultra low current shutdown mode Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions n 1.4 - 3.6V operation n No output coupling capacitors, snubber networks, bootstrap capacitors n Shutdown either channel independently n n n n n Applications n n n n n Notebook PCs Desktop PCs Mobile Phone PDAs Portable electronic devices Block Diagram 200893B8 FIGURE 1. Circuit Block Diagram Boomer ® is a registered trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation DS200893 .national. Typical Application 200893B2 FIGURE 2. Typical Audio Amplifier Application Circuit .national. Connection Diagrams TSSOP Package...