MAX98390

说明

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The MAX98390 is a high-efficiency mono Class-D DSM smart amplifier that features an integrated boost converter, integrated Dynamic Speaker Management^™, and FET scaling for higher-efficiency at low output power.

The maximum boost converter output voltage is programmable from 6.5V to 10V in 0.125V increments from a battery voltage as low as 2.65V. The boost converter supports bypass mode for lower quiescent current and improved mid-power efficiency as well as envelope tracking which automatically adjusts the output voltage for maximum efficiency. The boosted supply efficiently delivers up to 6.2W at 10% THD+N into a 4Ω load.

Integrated IV sense and Dynamic Speaker Management allows louder, fuller audio while protecting the speaker against damage and improving sound quality.

The PCM interface supports I²S, left-justified, and 16-channel TDM formats as a slave or master device with I²C control. Either BCLK or MCLK can be used as the internal clock source providing system level flexibility.

Thermal and other status data can also be read from the I²C interface.
Patented active emissions limiting edge rate and overshoot control circuitry minimizes EMI and eliminates the need for output filtering found in traditional Class-D devices.

A flexible brownout-detection engine (BDE) can be programmed to initiate various current limiting, signal limiting, and clip functions to prevent dips in battery voltage. Threshold, hysteresis, and attack-and-release rates are programmable.

The IC is available in a 0.4mm pitch, 36-bump wafer-level package. It is specified over the extended -40°C to +85°C temperature range.

Design Solution: Unleash the Full Potential of Your Micro Speakers ›

关键特性

• Integrated Speaker Current and Voltage Sense Requires no External Components
• Integrated Programmable 10V Boost Converter
  • Bypass Mode
  • Envelope Tracking
• Integrated Dynamic Speaker Management
  • Thermal Protection
  • Excursion Protection
  • Low-Frequency Extension
  • 8-Band Parametric Equalizer
  • Dynamic Range Compression
  • Perceptual Power Reduction
  • Debuzzer
  • Stereo Bass Management
• Ultra-Low Noise Floor
  • 9μV Output Noise
  • 117dB Dynamic Range
• Low Distortion—0.01% THD+N
• Output Power at 1% THD+N
  • 5.1W into 8Ω, V_VBAT = 4.3V
  • 5.1W into 4Ω, V_VBAT = 4.3V
• Output Power at 10% THD+N
  • 6.2W into 8Ω, V_VBAT = 4.3V
  • 6.2W into 4Ω, V_VBAT = 4.3V
• System Efficiency
  • 82% at 1.2W into 8Ω, V_VBAT = 3.7V
  • 86% at 0.45W into 8Ω, V_VBAT = 3.7V
• Dynamic Speaker Output FET Scaling
• 2.65V to 5.5V Battery Voltage Range
• I²S/16-Channel TDM and I²C Interfaces
• Class-D Edge Rate Control Enables Filterless Operation
• Advanced Brownout-Protection Engine
• Extensive Click-and-Pop Suppression
• Robust Short-Circuit and Thermal Protection
• Space-Saving, 36-Bump WLP Package (6.3mm², 0.4mm Pitch)

应用

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