LM48823

LM48823, LM48823TLEVAL www.ti.com LM48823 SNAS464E – JUNE 2008 – REVISED OCTOBER 2010 Mono, Bridge-Tied Load, Ceramic Speaker Driver with I2C Volume Control and Reset Check for Samples: LM48823, LM48823TLEVAL FEATURES 1 2 Integrated Charge Pump Bridge-Tied Load Output High PSRR I2C Volume and Mode Control Reset Input Advanced Click-and-Pop Suppression Low Supply Current Minimum External Components Micro-Power Shutdown Available in Space-Saving 16-Bump DSBGA Package APPLICATIONS Cell Phones Smart Phones Portable Media Devices Notebook PCs KEY SPECIFICATIONS Output Voltage at VDD = 4.2V, RL = 2.2µF + 15Ω THD+N ≤ 1%: 5.4VRMS (typ) Quiescent Power Supply Current at 4.2V: 3.3mA (typ) PSRR at 217Hz: 93dB (typ) Shutdown Current: 0.01μA (typ) DESCRIPTION The LM48823 is a single supply, mono, ceramic speaker driver with an integrated charge-pump, designed for portable devices, such as cell phones, where board space is at a premium. The LM48823 charge pump allows the device to deliver 5.4VRMS from a single 4.2V supply. The LM48823 features high power supply rejection ratio (PSRR), 93dB at 217Hz, allowing the device to operate in noisy environments without additional power supply conditioning. Flexible power supply requirements allow operation from 2.0V to 4.5V. The LM48823 features an active low reset input that reverts the device to its default state. Additionally, the LM48823 features a 32-step I2C volume control. The low power Shutdown mode r...