FAB3103
Overview
The FAB3103 is a mono Class-D audio amplifier with an integrated boost regulator that achieves high output audio over a power supply range of 2.5V to 5.2V. Automatic Boost Shutdown dynamically shuts down the boost regulator at low output power for greater efficiency and lower quiescent current consumption.
- High Output, Low Distortion Class-D Mono Speaker Amplifier o 2.3W into 8Ω from 3.6V Supply (10% THD+N) o 1.85W into 8Ω from 3.6V Supply (1% THD+N) o 0.01% THD+N into 8Ω (100mW)
- High-Efficiency Boost Regulator Provides Higher Output Power Over Li-Ion Battery Voltages o 85% Total Efficiency (3.6V, 8Ω, PO = 1.0W)
- Adaptive Boost Shutdown at Lower Output Power Increases Efficiency and Reduces Quiescent Current Consumption: o IDD = 2.7mA from 3.6V Supply
- Automatic Gain Control (AGC) Monitors Battery Voltage and Dynamically Adjusts Gain, Extending Battery Runtime
- Reduced Noise Floor Enhances Audio Playback o 38µV Output Noise (A-Weighted) o 100dB SNR (A-Weighted)
- Low-EMI Design Allows Filterless Operation
- High-Power Supply Ripple Rejection: o 88dB PSRR (fRIPPLE = 217Hz, Boost Enabled) o 70dB PSRR (fRIPPLE = 217Hz, Boost Bypassed)
- High Noise Rejection Using Differential Audio Inputs: o 75dB CMRR (fIN = 1kHz) o 71dB CMRR (fIN = 217Hz)
- Short-Circuit Protection
- Under-Voltage Protection
