PAM8945PJR

PAM8945 4.0W CLASS-G AUDIO AMPLIFIER WITH INTEGRATED BOOST CONVERTER AND BATTERY TRACKING AGC Description Pin Assignments (Top View) The PAM8945 is a high-efficiency Class-G audio power BGND SW amplifier with an integrated boost converter. It drives up to 4.0W (10% THD+N) into a 4 speaker. With 85% typical efficiency, the PAM8945 helps extend battery life when 12 11 playing audio. PVDD 1 10 VBAT The built-in boost converter generates the voltage rail for the output stage. This provides a louder audio output than a OUT+ 2 9 AGC stand-alone amplifier connected directly to the battery. It also maintains a consistent loudness, regardless of battery OUT- 3 8 EN voltage. The PAM8945 features battery tracking AGC function which PGND 4 7 IN+ adjusts the amplifier gain to limit battery current at lower battery voltage. 5 5 5 6 5 6 AGND IN- The PAM8945 features DC input protection and all outputs are fully protected against output-to-output shorts. The W-QFN2030-12 PAM8945 is available in tiny W-QFN2030-12 package. Applications Features Built-in Battery Tracking Automatic Gain Control (AGC) Cell Phones High-Efficiency Integrated Boost Converter Over 85% PDA 4.0W into a 4 Load at 10% THD GPS 3.2W into a 4 Load at 1% THD Portable Electronics Operates from 2.8V to 5.2V Speakers Efficient Class-G 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 2.0mm x 3.0mm 12L W-QFN Package Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Not e 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See PAM8945 Typical Applications Circuit 2.2H 2.8V to 5.2V + 10F 100F 1F 10F VBAT SW PVDD PGND ON OFF EN OUT+ IN+ Audio Input IN- OUT- AGC AGC AGND BGND Pin Descriptions Pin Number Pin Name Description 1 PVDD Boost Converter Output and Amplifier Power Supply 2 OUT+ Amplifier Positive Audio Output 3 OUT- Amplifier Negative Audio Output 4 PGND Power Ground 5 AGND Analog Ground 6 IN- Negative Audio Input 7 IN+ Positive Audio Input 8 EN Shutdown Terminal for the Chip 9 AGC AGC Setting Gain 10 VBAT Supply Voltage 11 SW Boost Convertor Switching 12 BGND Power Ground 2 of 9 PAM8945 June 2016 Diodes Incorporated www.diodes.com Document number: DS38267 Rev. 2 - 2 PROVISIONAL PRODUCT