●Product Details
●The SSM2377 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 2.5 W of continuous output power with <1% THD + N driving a 4 Ω load from a 5.0 V supply.
●The SSM2377 features a high efficiency, low noise modulation scheme that requires no external LC output filters. The modulation operates with high efficiency even at low output power.
●The SSM2377 operates with 92% efficiency at 1.4 W into 8 Ω from a 5.0 V supply and has an SNR of >100 dB.
●Spread-spectrum pulse density modulation (PDM) is used to provide lower EMI-radiated emissions compared with other Class-D architectures. The inherent randomized nature of spread-spectrum PDM eliminates the clock intermodulation (beating effect) of several amplifiers in close proximity.
●The SSM2377 produces ultralow EMI emissions that significantly reduce the radiated emissions at the Class-D outputs, particularly above 100 MHz. The SSM2377 passes FCC Class B radiated emission testing with 50 cm, unshielded speaker cable without any external filtering. The ultralow EMI emissions of the SSM2377 are also helpful for antenna and RF sensitivity problems.
●The device is configured for either a 6 dB or a 12 dB gain setting by connecting the GAIN pin to the VDD pin or the GND pin, respectively. Input impedance is a fixed value of 80 kΩ, independent of the gain select operation.
●The SSM2377 has a micropower shutdown mode with a typical shutdown current of 100 nA. Shutdown is enabled by applying a logic low to the SD pin.
●The device also includes pop-and-click suppression circuitry, which minimizes voltage glitches at the output during turn-on and turn-off, reducing audible noise on activation and deactivation. Built-in input low-pass filtering is also included to suppress outof-band noise interference to the PDM modulator.
●The SSM2377 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 halide-free, 9-ball, 0.4 mm pitch, 1.2 mm × 1.2 mm wafer level chip scale package (WLCSP).
●Applications
● Mobile phones
● MP3 players
● Portable electronics
●### Features and Benefits
● Filterless, Class-D amplifier with spread-spectrum Σ-Δ modulation
● 2.5 W into 4 Ω load and 1.4 W into 8 Ω load at 5.0 V supply with <1% total harmonic distortion plus noise (THD + N)
● 92% efficiency at 5.0 V, 1.4 W into 8 Ω speaker
● >100 dB signal-to-noise ratio (SNR)
● High PSRR at 217 Hz: 80 dB
● Ultralow EMI emissions
● Single-supply operation from 2.5 V to 5.5 V
● Gain select function: 6 dB or 12 dB
● Fixed input impedance of 80 kΩ
● 100 nA shutdown current
● Short-circuit and thermal protection with autorecovery
● Available in a 9-ball, 1.2 mm × 1.2 mm WLCSP
● Pop-and-click suppression
Part 3D Model
