TS4909 Dual mode low power 150 mW stereo headphone amplifier with capacitor-less and single-ended outputs Datasheet production data Features DFN10 (3 x 3) No output coupling capacitors necessary Pop-and-click noise reduction circuitry Operating from V = 2.2V to 5.5V CC Standby mode active low Pin connections (top view) Output power: 158 mW at 5 V, into 16 with 1% THD+N Vin1 11 1010 Vdd max (1 kHz) Stdby 22 99 Vout1 52 mW at 3.0 V into 16 with 1% THD+N max (1 kHz) 33 88 SE/PHG Vout3 Ultra-low current consumption: 2.0 mA typ. at 44 77 Vout2 Bypass 3V 55 66 Vin2 Gnd Ultra-low standby consumption: 10 nA typ. High signal-to-noise ratio: 105 dB typ. at 5 V High crosstalk immunity: 110 dB (F = 1 kHz) Functional block diagram for single-ended outputs PSRR: 72 dB (F = 1 kHz), inputs grounded, for Vdd SE/PHG phantom ground outputs Low t : 50 ms in PG mode, 100 ms in SE mode WU Vin1 Vout1 Available in lead-free DFN10 3 x 3 mm Stdby Applications Vout3 BIAS Bypass Headphone amplifier Mobile phone Vout2 Vin2 PDA, portable audio player Gnd Description The TS4909 is a stereo audio amplifier designed to drive headphones in portable applications. The Specially designed for applications requiring low integrated phantom ground is a circuit topology power supplies, the TS4909 is capable of that eliminates the heavy output coupling delivering 31 mW of continuous average power capacitors. This is of primary importance in into a 32 load with less than 1% THD+N from a portable applications where space constraints are 3 V power supply. Featuring an active low very high. A single-ended configuration is also standby mode, the TS4909 reduces the supply available, offering even lower power consumption current to only 10 nA (typ.). The TS4909 is unity because the phantom ground can be switched off. gain stable and can be configured by external Pop-and-click noise during switch-on and switch- gain-setting resistors. off phases is eliminated by integrated circuitry. January 2013 Doc ID 11972 Rev 9 1/35 This is information on a product in full production. www.st.com 35Contents TS4909 Contents 1 Typical application schematics 5 2 Absolute maximum ratings and operating conditions . 6 3 Electrical characteristics . 7 4 Application information . 23 4.1 General description . 23 4.2 Frequency response . 23 4.3 Gain using the typical application schematics . 24 4.4 Power dissipation and efficiency . 25 4.4.1 Single-ended configuration 25 4.4.2 Phantom ground configuration 26 4.4.3 Total power dissipation . 27 4.5 Decoupling of the circuit 27 4.6 Wake-up time 28 4.7 Pop performance . 28 4.8 Standby mode . 29 5 Package information 30 6 Ordering information . 33 7 Revision history . 34 2/35 Doc ID 11972 Rev 9