LM48555

LM48555 Ceramic Speaker Driver March 2007 LM48555 Ceramic Speaker Driver General Description The LM48555 is an audio power amplifier designed to drive ceramic speakers in applications such as cell phones, smart phones, PDAs and other portable devices. The LM48555 produces 15.7VP-P with less than 1% THD+N while operating from a 3.2V power supply. The LM48555 features a low power shutdown mode, and differential inputs for improved noise rejection. The LM48555 includes advanced click and pop suppression that eliminates audible turn-on and turn-off transients. Additionally, the integrated boost regulator features a soft start function that minimizes transient current during power-up Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal number of external components. The LM48555 does not require bootstrap capacitors, or snubber circuits. The LM48555 is unity-gain stable and uses external gain-setting resistors. Key Specifications ■ IDDQ (Boost Converter + Amplifier) at VDD = 5V 7.5mA (typ) ■ Output Voltage Swing VDD = 3.2V, THD ≤ 1% 15.7VP-P (typ) 80dB (typ) ■ Power Supply Rejection Ratio f = 217Hz Features ■ ■ ■ ■ ■ Fully differential amplifier Externally configurable gain Soft start function Low power shutdown mode Under voltage lockout Applications ■ Mobile phones ■ PDA's ■ Digital cameras Typical Application 300099c9 * CF+ and CF- are optional. Refer to “Selecting Input and Feedback Capacitor and Resistor for Aud...