FAB3103 Datasheet, PDF (1/13 Pages) Fairchild Semiconductor – 2.3 Watt Class-D Audio Amplifier with Integrated Boost Regulator and Automatic Gain Control

July 2012
FAB3103
2.3 Watt Class-D Audio Amplifier with Integrated
Boost Regulator and Automatic Gain Control
Features
 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, P_O = 1.0W)
 Adaptive Boost Shutdown at Lower Output Power
Increases Efficiency and Reduces Quiescent
Current Consumption:
o I_DD = 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 (f_RIPPLE = 217Hz, Boost Enabled)
o 70dB PSRR (f_RIPPLE = 217Hz, Boost Bypassed)
 High Noise Rejection Using Differential
Audio Inputs:
o 75dB CMRR (f_IN = 1kHz)
o 71dB CMRR (f_IN = 217Hz)
 Short-Circuit Protection
 Under-Voltage Protection
 “Click and Pop” Suppression
 Available in 12-Bump, 0.5mm Pitch, WLCSP
o Space-Saving 1.86mm x 1.44mm Package
Description
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.
Automatic Gain Control (AGC) monitors the battery
and reduces gain as the battery voltage drops to limit
maximum current consumption, extending battery
runtime and preventing mobile device shutdown.
Applications
 Smart Phones, Feature Phones
 Tablets, Portable Gaming Devices
 GPS, Active Speakers
Figure 1. Typical Application Circuit
Ordering Information
Part Number Operating Temperature Range
FAB3103UCX
-40°C to +85°C
Package
12-Bump, 0.5mm Pitch, Wafer-Level
Chip-Scale Package (WLCSP)
Packing Method
3000 Units
on Tape & Reel
© 2011 Fairchild Semiconductor
FAB3103 • Rev. 1.0.2
www.fairchildsemi.com