LM4802B Datasheet | National Semiconductor

Description The LM4802B integrates a Boost Converter with an Audio Power Amplifier to drive Ceramic Speakers in portable applications. When powered by a 3V supply, it is capable of forcing 12Vp-p across a 2µF + 30Ω bridge-tied-load (BTL) with less than 1% THD+N. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external ponents. The LM4802B does not require bootstrap capacitors, or snubber circuits. Therefore it is ideally suited for portable applications requiring high output voltage and minimal size. The LM4802B features a low-power consumption shutdown mode. Additionally, the LM4802B features an internal thermal shutdown protection mechanism. The LM4802B contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4802B is unity-gain stable. Its gain is set by external resistors. Key Specifications j Quiescent Power Supply Current j BTL Voltage Swing 12m A (typ) (2µF + 30Ω load, 1% THD+N, VDD = 3V) j Shutdown Current 12Vp-p (typ) 2µA (max) Features n Pop & click circuitry eliminates noise during turn-on and turn-off transitions n Low, 2µA (max) shutdown current n Low, 12m A (typ) quiescent current n 12Vp-p mono BTL output, load = 2µF + 30Ω, VDD = 3V n Short circuit protection n Unity-gain stable n External gain configuration capability Applications n Cellphone n PDA Connection Diagram LM4802BLQ (5x5) Top View Order Number LM4802BLQ See NS Package Number 2LQAQ028 Boomer ® is a registered trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation DS200941 .national. Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit .national. Absolute Maximum Ratings (Notes 1, 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and...