The STMicroelectronics TS488IST is a pop-free 120 mW stereo headphone amplifier from the TS488 series. This part number corresponds to the standard-grade instance of the TS488 family featuring MiniSO-8 lead-free packaging and tape-and-reel handling for the –40 °C to +85 °C temperature range. All specifications and parameters are taken directly from the device datasheet, revision DS4579 – Rev 8 – May 2020.

The TS488 is a dual-channel audio power amplifier designed to drive single-ended stereo headphones in 16 Ω or 32 Ω loads. It incorporates pop and click noise protection circuitry that eliminates the need for large coupling capacitors and additional external components required in earlier generations. The amplifier operates across a supply voltage range of 2.2 V to 5.5 V and delivers continuous average output power of up to 120 mW at 5 V into 16 Ω loads with a maximum THD+N of 0.1 % at 1 kHz.

Operating current consumption is limited to 2.7 mA maximum at 5 V with no input signal and no load. An externally controlled standby mode, active low for the TS488 variant, reduces supply current to an ultra-low typical value of 10 nA. The device provides high signal-to-noise ratio performance and high crosstalk immunity of 102 dB at 1 kHz. Power supply rejection ratio reaches 70 dB typical at 1 kHz with inputs grounded.

Unity-gain stability is maintained through external gain-setting resistors connected to the inverting inputs. The closed-loop gain is programmed as the absolute value of the feedback resistor divided by the input resistor. Short-circuit protection circuitry protects the outputs against overcurrent conditions. The amplifier maintains low distortion and maintains performance down to lower supply voltages, delivering up to 31 mW per channel into 16 Ω loads at 2.5 V with 0.1 % THD+N in the audio bandwidth.

The TS488IST is housed in a lead-free MiniSO-8 package with 8 pins configured as follows: pins 1 and 4 are outputs (OUT1 and OUT2), pin 5 is the bypass capacitor connection, pin 6 is the shutdown input (active low), pin 7 is the supply voltage (VCC), and pins 2 and 3 are the inputs (VIN1 and VIN2). The package supports surface-mount assembly and provides thermal resistance values suitable for compact audio applications.

Absolute maximum ratings specify supply voltage up to 6 V, input voltages from –0.3 V to VDD + 0.3 V, storage temperature from –65 °C to +150 °C, and maximum junction temperature of 150 °C. Power dissipation is limited to 0.58 W on a single-layer board in the MiniSO-8 package. ESD human-body-model protection is 2 kV pin-to-pin, and latch-up immunity is 200 mA on all pins. Operating conditions include load resistance of 16 Ω or greater and free-air temperature range of –40 °C to +85 °C.

Electrical characteristics at VDD = 5 V with no input signal and no load include supply current of 2 mA typical and 2.7 mA maximum. Standby current is 10 nA typical and 1 µA maximum when the shutdown pin is active. Output power reaches 120 mW at 0.1 % THD+N maximum into 16 Ω loads at 1 kHz and 100 mW at 1 % THD+N maximum into 16 Ω loads. Output swing is 4.5 V peak-to-peak typical into 16 Ω loads with load capacitor of 1 µF.

Gain bandwidth product is 1.1 MHz typical and slew rate is 0.65 V/µs typical in unity-gain configuration. Input offset voltage is 20 mV maximum and input capacitance is 1 pF typical. Wake-up time from standby is 100 ms typical when the bypass capacitor is charged through the shutdown pin. The device supports A-weighted signal-to-noise ratio of 105 dB typical and channel separation of 102 dB minimum.

The TS488 series is engineered for portable audio applications requiring low power consumption, low distortion, and minimal external components. Its combination of integrated pop-free circuitry, wide supply range, and ultra-low standby current supports efficient operation in mobile phones, PDAs, computer motherboards, high-end TVs, and portable audio players.

In summary, the STMicroelectronics TS488IST is a dual-channel stereo headphone amplifier optimized for low-power portable audio devices. Its datasheet specifications confirm 120 mW output into 16 Ω loads at 0.1 % THD+N, 10 nA standby current, 2.7 mA maximum supply current, and reliable performance across the –40 °C to +85 °C range in MiniSO-8 packaging, delivering high signal-to-noise ratio and crosstalk immunity for clean headphone amplification in consumer electronics.