LM4951 Datasheet | National Semiconductor

Description The LM4951 is an audio power amplifier primarily designed for demanding applications in Portable Handheld devices. It is capable of delivering 1.8W mono BTL to an 8Ω load, continuous average power, with less than 1% distortion (THD+N) from a 7.5VDC power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external ponents. The LM4951 does not require bootstrap capacitors, or snubber circuits. The LM4951 features a low-power consumption active-low shutdown mode. Additionally, the LM4951 features an internal thermal shutdown protection mechanism. The LM4951 contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4951 is unity-gain stable and can be configured by external gain-setting resistors. Key Specifications j Wide Voltage Range j Quiescent Power Supply Current 2.7V to 9V 2.5m A (typ) 1.8W (typ) 0.01µA (typ) 25m S (typ) (VDD = 7.5V) j Power Output BTL at 7.5V, 1% THD j Shutdown Current j Fast Turn on Time Features n Pop & click circuitry eliminates noise during turn-on and turn-off transitions n Low current, active-low shutdown mode n Low quiescent current n Thermal shutdown protection n Unity-gain stable n External gain configuration capability Applications n Portable Handheld Devices up to 9V n Cell Phone n PDA Typical Application 200942F4 - RC is needed for over/under voltage protection. If inputs are less than VDD +0.3V and greater than - 0.3V, and if inputs are disabled when in shutdown mode, then RC may be shorted. FIGURE 1. Typical Bridge-Tied-Load (BTL) Audio Amplifier Application Circuit Boomer ® is a registered trademark of National Semiconductor Corporation. © 2005 National Semiconductor Corporation DS200942 .national. Connection Diagrams SD Package .. Top View Order Number LM4951SD See NS Package Number SDC10A 9 Bump micro SMD Package Top View...