SKY76206-21

Mono Low-Power Multi-Level Class D Audio Amplifier IC

The Skyworks SKY76206-21 Mono Low-power Multi-Level Class D Audio Amplifier IC is an innovative Class DG amplifier that delivers world class audio performance in a compact package with ultra-low quiescent power levels, and is ideal for portable and wearable electronics.

Unlike most Class D amplifiers on the market, the SKY76206-21 directly processes a digital audio input to create its audio output. The audio signal is reproduced with very high fidelity, even in dense electronics with multiple nearby radio transmitters. The device is optimized for efficiency at low output power levels where most Class D amplifiers are highly inefficient, making it the right fit for wearables with high sensitivity speaker drivers. It has a low quiescent power in active mode, and its state-of-the-art pop and click suppression makes transitions into the low power consumption standby mode a seamless experience to the user while preserving battery life.

The SKY76206-21 requires two power inputs. VBAT (+2.3 V to +4.9 V) is commonly connected directly to a lithium-ion battery, avoiding the efficiency losses of a voltage regulator. VDDIO (+1.2 V or +1.8 V) must be a regulated voltage, selected to best match the output voltage levels of the external host microcontroller, driving the I2C, digital audio, and GPIO nets. VDDIO is also the input source for the internal voltage regulator which generates two regulated voltages, VDD0P9 (+0.9 V) and VDDLV (+0.275 V). Each of these four voltage nets require only an external bulk capacitor adjacent to the pin for normal operation.

The differential audio output pins operate at 3.072 MHz, with a pulse-width and voltage modulated (PWVM) square wave, with a magnitude that varies between VDDLV (+0.275 V), VDD0P9 (+0.9 V), VDDIO, and VBAT. This differential output acts as a charge-pump into an inductive load (speaker driver) to recreate the audio signal. Figure 2 shows this in concept (timing is not to scale) for VDDIO = +1.8 V and VBAT = +3.8 V.

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Product LifecycleIn Production

DescriptionMono Low-Power Multi-Level Class D Audio Amplifier IC

Package15-pin WLCSP

Package (mm)1.54 x 1.54 x 0.471

Features

Filterless multi-level Class D output
Low power consumption:
- Quiescent power of 800 μW @ 1.2 V
- Standby power (I²C activity) of 60 μW @ 1.2 V
- Reset power <4 μW
High incremental output efficiency:
- 82% (62 mW output to 16 Ω)
- 88% (100 mW output to 16 Ω)
High quality audio performance:
- DNR > 111 dB (A-weighted)
- THD+N: –84 dB
- PSRR: 94 dB at 20 kHz
- Pop and click suppression <–76 dBV_PK
Low latency: < 5 μS
Supply voltage inputs:
- VBAT (+2.3 V to +4.9 V)
- VDDIO (+1.2 V to +1.8 V)
Internally-generated low-voltage supplies
Audio turn-on or turn-off time: 1.8 ms
Operating Modes:
- Reset
- Standby
- Audio normal-gain mode: 0 dB
- Audio high-gain mode: +6 dB
- Fault
Refer to data sheet for additional features and information

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