SSM2319

无滤波器，高效率，单声道3瓦D类音频放大器 Filterless, High Efficiency, Mono 3 W Class-D Audio Amplifier

Product Details

The is a fully integrated, high efficiency Class-D audio amplifier. It is designed to maximize performance for mobile phone applications. The application circuit requires a minimum of external components and operates from a single 2.5 V to 5.5 V supply. It is capable of delivering 3 W of continuous output power with <1% THD + N driving a 3 Ω load from a 5.0 V supply.

The SSM2319 features a high efficiency, low noise modulation scheme that does not require any external LC output filters. The modulation continues to provide high efficiency even at low output power. It operates with 90% efficiency at 1.4 W into 8 Ω or 85% efficiency at 3 W into 3 Ω from a 5.0 V supply and has an SNR of 98 dB. Spread-spectrum pulse density modulation is used to provide lower EMI-radiated emissions compared with other Class-D architectures.

SYNC can be activated in the event that end users are concerned about clock intermodulation beating effect of several amplifiers in close proximity.

The SSM2319 has a micropower shutdown mode with a typical shutdown current of 20 nA. Shutdown is enabled by applying a logic low to the SD pin.

The device also includes pop-and-click suppression circuitry. This minimizes voltage glitches at the output during turn-on and turn-off, reducing audible noise on activation and deactivation.

The default gain of the SSM2319 is 12 dB, but users can reduce the gain by using a pair of external resistors.

The SSM2319 is specified over the industrial temperature range of −40°C to +85°C. It has built-in thermal shutdown and output short-circuit protection. It is available in a 9-ball, 1.5 mm × 1.5 mm wafer level chip scale package WLCSP.

**Applications**

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Mobile phones

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MP3 players

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Portable gaming

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Portable electronics

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Educational toys

### Features and Benefits

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Filterless Class-D amplifier with ultraefficient spread-spectrum Σ-Δ modulation

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Internal modulator synchronization SYNC

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3 W into 3 Ω load and 1.4 W into 8 Ω load at 5.0 V supply with <1% total harmonic distortion THD

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90% efficiency at 5.0 V, 1.4 W into 8 Ω speaker

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Signal-to-noise ratio SNR: 98 dB

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Single-supply operation: 2.5 V to 5.5 V

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Ultralow shutdown current: 20 nA

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Short-circuit and thermal protection with autorecovery

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Available in 9-ball, 1.5 mm × 1.5 mm WLCSP

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Pop-and-click suppression

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Built-in resistors reduce board component count

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Default fixed 12 dB or user-adjustable gain setting