A Product Line of Diodes Incorporated 1.9W Class-D Audio Amplifier with Integrated Boost Converter and Battery Tracking AGC Description PAM8905 Pin Assignments The PAM8905 is a high efficiency Class-D audio power amplifier with an integrated boost converter. It drives up to 1.9W (1% THD+N) into an 8Ω speaker. With 85% typical efficiency, the PAM8905 helps extend battery life when playing audio. 1 The built-in boost converter generates the voltage rail for the output stage. This provides a louder audio output than a stand-alone amplifier connected directly to the battery. It also maintains a consistent loudness, regardless of battery voltage. 2 3 A PVDD SW BGND B OUT + AGC VBAT C OUT- EN IN+ D PGND AGND IN- The PAM8905 features battery tracking AGC function which adjusts the Class-D gain to limit battery current at lower battery voltage. (TOP VIEW) PAM8905 features DC input protection and all outputs are fully protected against output-to-output shorts. The PAM8905 is available in U-WLB1520-12 package. Features Applications Built-In Battery Tracking Automatic Gain Control (AGC) High Efficiency Integrated Boost Converter Over 85% 1.9W into an 8Ω Load from a 3.6V Supply Operates from 2.8V to 5.2V Efficient Class-D Prolongs Battery Life Minimized ON/OFF Pop Noise Superior Low Noise High PSRR DC Input Protection Auto-Recovery Short-Circuit Protection Thermal Shutdown Available in U-WLB1520-12 Package Cell Phones PDA GPS Portable Electronics Speakers Typical Applications Circuit 2.8V to 5.2V V BAT 10uF 2.2uH V BAT SW EN IN+ Audio Input INAGC PAM8905 Document number: DS37026 Rev. 2 - 2 AGC AGND 1 of 9 www.diodes.com PVDD 10uF~22uF AGND OUT+ OUTPGND May 2015 © Diodes Incorporated A Product Line of Diodes Incorporated 1.9W Class-D Audio Amplifier with Integrated Boost Converter and Battery Tracking AGC PAM8905 Pin Descriptions Pin Name Pin Number Description PVDD A1 Boost Converter Output and Class D Amplifier Power Supply OUT+ B1 Amplifier Positive Audio Output OUT- C1 Amplifier Negative Audio Output PGND D1 Class-D Power Ground SW A2 AGC B2 EN C2 AGND D2 Boost Convertor Switching AGC Inflection Point Select Connect to VBAT, GND or Float. Voltage at AGC pin is only read at device power-up. A power cycle is required to change inflection points. Device Enable Set to logic high to enable Analog Ground BGND A3 Boost Converter Power Ground VBAT B3 Supply Voltage IN+ C3 Positive Audio Input IN- D3 Negative Audio Input Block Diagram V BAT EN Bias SW IN+ AGC PVDD Boost Convertor + PWM Modulator - IN- Gate Drive OUT+ Gate Drive OUT- SCP OTP DCP UVLO AGC VREF OSC AGND PAM8905 Document number: DS37026 Rev. 2 - 2 BGND 2 of 9 www.diodes.com Startup Protection PGND May 2015 © Diodes Incorporated A Product Line of Diodes Incorporated 1.9W Class-D Audio Amplifier with Integrated Boost Converter and Battery Tracking AGC PAM8905 Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) VALUE UNIT –0.3 to 6.0 V –0.3 to VBAT + 0.3 V VBAT Supply voltage VI Input voltage, EN, IN+, IN–, AGC TA Operating free-air temperature range –40 to 85 °C TJ Operating junction temperature range –40 to 150 °C Tstg Storage temperature range –65 to 150 °C Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) MIN MAX UNIT 2.8 5.2 V VBAT V VBAT Supply voltage VIH High-level input voltage EN 1.3 VIL Low-level input voltage EN GND 0.6 V TA Operating free-air temperature –40 85 °C Thermal Information Parameter Thermal Resistance (Junction to Ambient) PAM8905 Document number: DS37026 Rev. 2 - 2 Symbol Package Maximum Unit JA U-WLB1520-12 85 °C/W 3 of 9 www.diodes.com May 2015 © Diodes Incorporated A Product Line of Diodes Incorporated 1.9W Class-D Audio Amplifier with Integrated Boost Converter and Battery Tracking AGC Electrical Characteristics Symbol VBAT Po PAM8905 (@VBAT=3.6V, AGC=GND, TA = +25°C, RL=8Ω+33µH, unless otherwise specified.) Parameter Test Conditions MIN TYP MAX UNIT 2.8 5.2 V VBAT=3.6V 1900 VBAT=3.0V 1750 VBAT=2.8V 1600 0.07 0.15 f=217Hz -70 f=1kHz -70 Supply Voltage Output Power THD+N=1%,f=1kHz mW Total Harmonic Distortion Plus Noise Po=1.0W,RL=8Ω Power Supply Ripple Rejection VBAT=3.6V, Inputs ACGrounded with C=1μF SNR Signal-to-Noise Ratio A-Weighting THD+N=1% 95 dB Vop Peak Output Voltage Boost Convertor Auto-Pass Through Threshold VBAT=3.6V f=1kHz 5.75 V 2 Vpk Output Noise Inputs AC-Grounded No A-Weighting 100 A-Weighting 60 η Efficiency VBAT=4.2V, Po=1.5W f=1kHz 85 % IQ Quiescent Current VBAT=3.6V No Load 4 mA Isd Shutdown Current VBAT=2.8V to 5.2V EN=0V 1 μA High Side PMOS,I=500mA VBAT=5V 260 mΩ Low Side NMOS,I=500mA VBAT=5V 160 mΩ Boost 1200 Class D 300 20 dB THD+N PSRR Vo_TH Vn Rdson fsw Static Drain-to Source OnState Resistor Switching Frequency f=1kHz Po=2W,RL=4Ω % dB VBAT=2.8V to 5.2V μV kHz Gv Closed-Loop Gain RIN Input Impedance Av=20dB 24 KΩ Vos Output Offset Voltage Input AC-Ground 10 mV Convertor SW Peak Current VBAT=3.6V 2 A 6 mS Ipeak Ton Start-up Time From EN VIH EN Input High Voltage VBAT=5V 1.3 VIL EN Input Low Voltage VBAT=5V PAM8905 Document number: DS37026 Rev. 2 - 2 4 of 9 www.diodes.com 0.6 V May 2015 © Diodes Incorporated A Product Line of Diodes Incorporated 1.9W Class-D Audio Amplifier with Integrated Boost Converter and Battery Tracking AGC PAM8905 Performance Characteristics (@VBAT=3.6V, AGC=GND, TA = +25°C, RL=8Ω+33µH, unless otherwise specified.) THD+N Vs. Output Power (RL=8Ω) THD+N Vs. Output Power (RL=4Ω) 20 20 f=100Hz/1kHz/10kHz 10 (Red/Pink/Blue) 10 5 5 2 2 1 1 % f=100Hz/1kHz/10kHz (Red/Pink/Blue) % 0.5 0.5 0.2 0.2 0.1 0.1 0.05 0.05 0.02 0.02 0.01 1m 0.01 1m 2m 5m 10m 20m 50m 100m 200m 500m 1 2 2m 5m 10m 20m 4 50m 100m 200m 500m 1 2 5 8 W W THD+N Vs. Frequency (RL=8Ω) THD+N Vs. Frequency (RL=4Ω) 10 5 10 Po=0.3W/0.5W/1W (Red/Pink/Blue) 5 2 2 1 % Po=0.3W/0.5W/1W (Red/Pink/Blue) 1 0.5 % 0.2 0.5 0.2 0.1 0.1 0.05 0.05 0.03 20 50 100 200 500 1k 2k 5k 10k 20k 0.03 20 Hz 50 100 200 500 1k 2k 5k 10k 20k 5k 10k 20k Hz PSRR Vs. Frequency(RL=8Ω) +0 TT TT TT TTT -10 PSRR Vs. Frequency(RL=4Ω) +0 TT TT TT TTT TT T TT -10 AGC=GND -20 -20 -30 -30 -40 -40 -50 d B -50 d B -60 -60 -70 -70 -80 -80 -90 -90 -100 -100 -110 20 AGC=GND 50 100 200 500 1k 2k 5k 10k 20k Hz PAM8905 Document number: DS37026 Rev. 2 - 2 -110 20 50 100 200 500 1k 2k Hz 5 of 9 www.diodes.com May 2015 © Diodes Incorporated A Product Line of Diodes Incorporated 1.9W Class-D Audio Amplifier with Integrated Boost Converter and Battery Tracking AGC PAM8905 Performance Characteristics (@VBAT=3.6V, AGC=GND, TA = +25°C, RL=8Ω+33uH, unless otherwise specified.) Noise Floor (RL=8Ω) Gain Vs. Supply Voltage +0 -10 -20 -30 -40 d B r -50 A -70 -60 Vin=50mVrms AGC=Float/GND/VBAT (Red /Blue/Green) -80 -90 -100 -110 -120 20 50 100 200 500 1k 2k 5k 10k 20k Hz Efficiency Vs. Output Power (RL=8Ω) Quiescent Current Vs. Supply Voltage Start-Up PAM8905 Document number: DS37026 Rev. 2 - 2 Shutdown 6 of 9 www.diodes.com May 2015 © Diodes Incorporated A Product Line of Diodes Incorporated 1.9W Class-D Audio Amplifier with Integrated Boost Converter and Battery Tracking AGC PAM8905 Ordering Information PAM8905 X X X Pin Configuration P: 12 Pin Package Type Z: U-WLB1520-12 Shipping Package R: Tape & Real Part Number Package Standard Package PAM8905PZR U-WLB1520-12 3,000Units/Tape & Reel Marking Information U-WLB1520-12 FS: Product Code Y: Year W: Week PAM8905 Document number: DS37026 Rev. 2 - 2 7 of 9 www.diodes.com May 2015 © Diodes Incorporated A Product Line of Diodes Incorporated 1.9W Class-D Audio Amplifier with Integrated Boost Converter and Battery Tracking AGC PAM8905 Package Outline Dimensions (All dimensions in mm.) Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for the latest version. D b Ø(12x) SE Pin #1 ID U-WLB1520-12 Dim Min Max Typ A 0.500 0.600 0.550 A1 0.185 0.235 0.210 A2 0.315 0.365 0.340 b 0.208 0.308 0.258 D 1.420 1.500 -D2a 0.950 1.050 1.000 E 1.920 2.000 -E2a 1.450 1.550 1.500 e 0.500 BSC SD 0.250 BSC SE 0.000 BSC All Dimensions in mm e E E2a SD e D2a A2 A A SEATING PLANE Suggested Pad Layout Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version. D Ø(12x) Dimensions C C D X Y Y1 Y1 Value (in mm) 0.500 0.258 1.000 0.250 1.500 Y C X PAM8905 Document number: DS37026 Rev. 2 - 2 8 of 9 www.diodes.com May 2015 © Diodes Incorporated A Product Line of Diodes Incorporated 1.9W Class-D Audio Amplifier with Integrated Boost Converter and Battery Tracking AGC PAM8905 IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. 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