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SSM2319:  Filterless, High Efficiency, Mono 3 W Class-D Audio Amplifier

Product Details

The SSM2319 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 (see the Gain section).

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).


  • Mobile phones
  • MP3 players
  • Portable gaming
  • Portable electronics
  • Educational toys


  • Filterless Class-D amplifier with ultraefficient spread-spectrum Σ-Δ modulation
  • Internal modulator synchronization (SYNC)
  • 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)
  • 90% efficiency at 5.0 V, 1.4 W into 8 Ω speaker
  • Signal-to-noise ratio (SNR): 98 dB
  • Single-supply operation: 2.5 V to 5.5 V
  • Ultralow shutdown current: 20 nA
  • See data sheet for additional features

SSM2319 Functional Block Diagram


Title Content Type File Type
SSM2319: Filterless, High Efficiency, Mono 3 W Class-D Audio Amplifier Data Sheet (Rev 0, 08/2008) (pdf, 491 kB) Data Sheets PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

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Price, packaging, availability

SSM2319 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
SSM2319CBZ-REEL Status: Production 9 ball WLCSP (1.46x1.46) 9 Ind Reel, 10000 - $0.72 Y  Material Info PCN Purchase
SSM2319CBZ-REEL7 Status: Production 9 ball WLCSP (1.46x1.46) 9 Ind Reel, 3000 - $0.72 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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