Datasheet

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FAB3103 • Rev. 1.0.2

FAB3103 — 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 8 from 3.6V Supply (10% THD+N)

o 1.85W into 8 from 3.6V Supply (1% THD+N)

o 0.01% THD+N into 8 (100mW)

 High-Efficiency Boost Regulator Provides Higher

Output Power Over Li-Ion Battery Voltages

o 85% Total Efficiency (3.6V, 8, P

= 1.0W)

 Adaptive Boost Shutdown at Lower Output Power

Increases Efficiency and Reduces Quiescent

Current Consumption:

o I

= 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

= 1kHz)

o 71dB CMRR (f

= 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 Package Packing Method

FAB3103UCX -40°C to +85°C

12-Bump, 0.5mm Pitch, Wafer-Level

Chip-Scale Package (WLCSP)

3000 Units

on Tape & Reel

Summary of content (13 pages)

PAGE 1
FAB3103 2.3 Watt Class-D Audio Amplifier with Integrated Boost Regulator and Automatic Gain Control Features 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.   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.
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Figure 2.
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Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol Parameter Min. Max. Unit VBATT Voltage on VBATT Pin -0.3 6.0 V VOUT Voltage on OUT-, OUT+ Pins -0.
PAGE 4
Unless otherwise noted: AGCT=GND, RL=8Ω + 33µH, f=1KHz, and audio measurement bandwidth=22Hz to 20KHz (AES17). Typical values are at VBATT=3.6V, TA=25°C, with typical external component values. Symbol Parameter Conditions Min. Typ. Max. Unit IDD Quiescent Current Inputs AC Grounded, EN=HIGH 2.7 ISD Shutdown Current EN=PGND, Inputs AC Grounded 0.1 2.
PAGE 5
Unless otherwise noted: AGCT=GND, RL=8Ω + 33µH, f=1KHz, and audio measurement bandwidth=22Hz to 20KHz (AES17). Typical values are at VBATT=3.6V, TA=25°C, with typical external component values. Symbol en Parameter Output Noise Conditions Min. Typ. Max. Unit A-Weighted 38 Unweighted 51 µVrms TSTD Thermal Shutdown Junction Temperature 165 °C THYS Thermal Shutdown Hysteresis Junction Temperature 25 °C VULVO VBATT Under-Voltage Shutdown VHYS 1.8 2.1 2.
PAGE 6
Unless otherwise noted: AGCT = GND, RL = 8Ω + 33µH, f = 1KHz, audio measurement bandwidth 22Hz to 20KHz (AES17), VBATT = 3.6V, TA = 25°C, typical external component values. -80 5 Inputs AC grounded Inputs AC grounded -90 4.5 -100 Amplitude (dBV) Supply Current (mA) 4 3.5 3 -110 -120 -130 2.5 -140 2 -150 2.5 3 3.5 4 4.5 Supply Voltage (V) 5 0 5.5 2 6 8 10 12 Frequency (KHz) 14 16 18 20 Figure 4. A-Weighted Output Noise vs. Frequency Figure 3. Quiescent Supply Current vs.
PAGE 7
Signal Path Low EMI The FAB3103 features a fully differential signal path for noise rejection. The low-EMI design allows the OUT+ and OUT- pins to be connected directly to a speaker without an output filter. To minimize EMI, edge-rate control for the boost regulator and Class-D amplifier can be employed. The boost regulator's edge-rate control is disabled by default. For devices with 20ns boost edge rates or 10ns boost edge rates, contact a Fairchild Representative.
PAGE 8
VIN (V) 0.6 0.4 0.2 0 0 20 40 60 80 100 120 140 160 180 200 0 20 40 60 80 100 120 140 160 180 200 100 120 140 160 180 200 PVDD (V) 6.0 4.0 2.0 0.0 Battery Current (A) 2.5 2.0 Boost Converter Peak Input Current Limit 1.5 1.0 0.5 0.0 0 20 40 60 80 Time (µs) Figure 9.
PAGE 9
Target Gain (V/V) 1.0 0.8 POUT (W) 0.6 0.2 2.5 Line Color Red Green Blue 3.0 3.5 4.0 VBATT (V) 4.5 AGCT Configuration Float Ground VBATT 0.0 5.0 2.5 AGC Trip Point (V) 3.25 3.55 3.75 Line Color Magenta Cyan Black Figure 10. Target Gain vs. Battery Voltage Target Gain (dB) 3.5 4.0 VBATT (V) AGCT Configuration Float Ground VBATT AGC Trip Point (V) 3.25 3.55 3.75 4.5 5.0 Input Voltage (Vpk) 0.3 0.3 0.
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voltage, current draw remains elevated, eventually resulting in handset shutdown. Figure 14. AGC Changes vs. Time, Example 1 Figure 15. AGC Changes vs. Time, Example 2 © 2011 Fairchild Semiconductor FAB3103 • Rev. 1.0.2 www.fairchildsemi.com 10 FAB3103 — 2.
PAGE 11
Layout Considerations General layout and supply bypassing play a major role in analog performance and thermal characteristics. Fairchild offers an evaluation board to guide layout and aid device evaluation. Contact a Fairchild representative for information about evaluation boards. Following the recommended layout configuration (shown in Figure 16) provides optimum performance for the device. For best results, follow the steps and recommended routing rules listed below.
PAGE 12
F 0.03 C A E 2X B 0.50 A1 PIN 1 AREA (Ø0.200) CU PAD F D (Ø0.300) SOLDER MASK OPENING 0.50 1.50 0.03 C 2X TOP VIEW RECOMMENDED LAND PATTERN (NSMD) 0.06 C 0.625 0.547 E 0.05 C C D 0.378±0.018 0.208±0.021 SEATING PLANE SIDE VIEWS F NOTES: (X)+/-.018 0.005 0.50 C A B 12x Ø0.260±0.02 D C 0.50 B A 1 2 F (Y)+/-.018 3 BOTTOM VIEW A. NO JEDEC REGISTRATION APPLIES. B. DIMENSIONS ARE IN MILLIMETERS. C. DIMENSIONS AND TOLERANCE PER ASME Y14.5M, 1994. D.
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FAB3103 — 2.3 Watt Class-D Audio Amplifier with Integrated Boost Regulator and Automatic Gain Control 13 www.fairchildsemi.com © 2011 Fairchild Semiconductor FAB3103 • Rev. 1.0.