A21SP16J STMicroelectronics

A21SP16 3 W filter-free class-D audio power amplifier Datasheet - production data Output power: 1.4 W 5 V or 0.45 W 3 V Pin connection into 8 with 1% THD+N max ININ GNDGND Adjustable gain via external resistors OUTOUT ++ -- 1/1/AA11 2/A22/A2 3/A33/A3 Low current consumption 2 mA 3 V VV VV GNGNDD DDDD DDDD Efficiency: 88% typ. 4/4/BB11 5/B25/B2 6/B36/B3 Signal to noise ratio: 85 dB typ. STSTBYBY OUTOUT ININ -- ++ PSRR: 63 dB typ. 217 Hz with 6 dB gain 7/C7/C11 8/C28/C2 9/C9/C33 PWM base frequency: 250 kHz IN+: positive differential input IN-: negative differential input Low pop & click noise VDD: analog power supply GND: power supply ground Thermal shutdown protection STBY: standby pin (active low) OUT+: positive differential output Available in flip-chip 9 x 300 m (Pb-free) OUT-: negative differential output Block diagram Applications B1 B2 Wearable Vcc Stdby C2 Internal Fitness and healthcare Bias Out+ 150k C3 Cellular phone C1 Output - In- PDA H PWM In+ + Bridge A1 A3 150k Out- Description Oscillator GND The A21SP16 is a differential class-D BTL power A2 B3 amplifier. It is able to drive up to 2.3 W into a 4 load and 1.4 W into a 8 load at 5 V. It achieves outstanding efficiency (88% typ.) compared to classical Class-AB audio amps. Features The gain of the device can be controlled via two Operating from V = 2.4 V to 5.5 V CC external gain-setting resistors. Pop & click Standby mode active low reduction circuitry provides low on/off switch noise while allowing the device to start within 5 Output power: 3 W into 4 and 1.75 W into 8 ms. A standby function (active low) allows the with 10% THD+N max and 5 V power supply reduction of current consumption to 10 nA typ. Output power: 2.3 W 5 V or 0.75 W 3 V into 4 with 1% THD+N max Table 1. Device summary Order codes Temperature range Package Packaging Marking A21SP16J -40 C to +85 C Lead-free flip-chip Tape & reel 62 July 2020 DocID026037 Rev 2 1/37 This is information on a product in full production. www.st.com 300kContents A21SP16 Contents 1 Absolute maximum ratings . 3 2 Application component information 4 3 Electrical characteristics . 5 4 Electrical characteristic curves . 16 5 Application information . 27 5.1 Differential configuration principle 27 5.2 Gain in typical application schematic 27 5.3 Common mode feedback loop limitations 28 For example: . 28 5.4 Low frequency response . 28 5.5 Decoupling of the circuit 29 5.6 Wake-up time (t ) . 29 WU 5.7 Shutdown time (t ) . 29 STBY 5.8 Consumption in shutdown mode . 29 5.9 Single-ended input configuration . 29 5.10 Output filter considerations 31 5.11 Different examples with summed inputs 32 Example 1: Dual differential inputs . 32 Example 2: One differential input plus one single-ended input . 33 6 Footprint recommendations 34 7 Package information 35 8 Revision history . 36 2/37 DocID026037 Rev 2