LM48100Q-Q1 - Mono 1.3W Audio Power Amplifier with Output Fault Detection and Volume Control

The LM48100Q-Q1 is a single supply, mono, bridge-tied load amplifier with I²C volume control, ideal for automotive applications. A comprehensive output fault detection system senses the load conditions, protecting the device during short circuit events, as well as detecting open circuit conditions.

Operating from a single 5-V supply, the LM48100Q-Q1 delivers 1.3 W of continuous output power to an 8 Ω load with < 1% THD+N. Flexible power supply requirements allow operation from 3 V to 5.5 V. High power supply rejection ratio (PSRR), 74 dB at 1 kHz, allows the device to operate in noisy environments without additional power supply conditioning.

The LM48100Q-Q1 features dual audio inputs that can be mixed/multiplexed to the device output. Each input path has its own independent, 32-step volume control. The mixer, volume control and device mode select are controlled through an I²C compatible interface. An open drain FAULT output indicates when a fault has occurred. Comprehensive output short circuit and thermal overload protection prevent the device from being damaged during a fault condition.

A low power shutdown mode reduces supply current consumption to 0.01 µA. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM48100Q-Q1 is available in an 14-pin HTSSOP PowerPAD™ IC package.

• Output Fault Detection
• I²C Volume and Mode Control
• Input Mixer and Multiplexer
• High PSRR
• Individual 32-Step Volume Control
• Short Circuit and Thermal Protection
• Advanced Click-and-Pop Suppression
• Low-Power Shutdown Mode
• Available in 14-Pin HTSSOP Package
• Key Specifications:
  • Output Power at V_DD = 5 V, R_L = 8 Ω,
    THD+N ≤ 1% 1.3 W (Typical)
  • Quiescent Power Supply Current at 5 V,
    6 mA (Typical)
  • PSRR at 1 kHz 74 dB (Typical)
  • Shutdown current 0.01 µA (Typical)