LM48580

LM48580 High Efficiency Class H, High Voltage, Haptic Piezo Actuator / Ceramic Speaker Driver LM48580 February 23, 2010 High Efficiency Class H, High Voltage, Haptic Piezo Actuator / Ceramic Speaker Driver General Description The LM48580 is a fully differential, high voltage driver for piezo actuators and ceramic speakers for portable multi-media devices. Part of National’s Powerwise product line, the LM48580’s Class H architecture offers significant power savings compared to traditional Class AB amplifiers. The device provides 30VP-P output drive while consuming just 15mW of quiescent power. The LM48580 is a single supply driver with an integrated boost converter which allows the device to deliver 30VP-P from a single 3.6V supply. The LM48580 has three pin-programmable gain settings and a low power Shutdown mode that reduces quiescent current consumption to 0.1µA. The LM48580 is available in an ultrasmall 12-bump micro SMD package (1.46mm x 1.97mm). Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Class H Driver Integrated Boost Converter Bridge-tied Load Output Differential Input Three Pin-Programmable Gains Low Supply Current Minimum external components Micro-power shutdown Thermal overload protection Available in space-saving 12-bump microSMD package Applications ■ ■ ■ ■ Touch screen Smart Phones Tablet PCs Portable Electronic Devices MP3 Players Key Specifications ■ Output Voltage at VDD = 3.6V RL = 6μF+10Ω, THD+N ≤ 1% ■ Quiescent Power Supply current at 3.6V 2.7mA (typ) 800mW (typ) 0...