MAX9788ETI+

Audio Amplifiers Overview

The MAX9788ETI+ is a mono Class G power amplifier with an integrated inverting charge-pump supply, designed for ceramic/piezoelectric speakers. It operates on a single 2.7V to 5.5V supply and delivers a 14V P-P voltage swing. The device provides 2.4W continuous output power into an 8Ω load at 1kHz (1% THD+N). Key electrical parameters include 8mA quiescent current, 0.3µA shutdown current, 12dB fixed gain, and 0.002% THD+N. It features comprehensive click-and-pop suppression and operates within the -40°C to +85°C temperature range.

Audio Amplifiers Feature Summary

• Class G output stage transitions between low and high supply ranges to maximize efficiency without EMI penalties.
• Integrated inverting charge pump generates negative supply rail without external inductors.
• Fully differential inputs provide improved noise immunity over single-ended configurations.
• Comprehensive click-and-pop suppression ensures silent startup and shutdown.

Audio Amplifiers Applications

• Mobile phones
• Smartphones
• MP3 players
• Personal media players

Audio Amplifiers Procurement Notes

Verify the package type matches the required footprint; this specific part number corresponds to the 28-pin TQFN-EP variant. Confirm lead-free status and RoHS compliance through official manufacturer documentation before integration. Ensure the design accounts for the exposed pad connection to ground for thermal dissipation. Cross-reference the datasheet revision history to confirm pinout consistency with existing designs.

Audio Amplifiers Selection Notes

Select this component when driving highly capacitive ceramic or piezoelectric speakers requiring high peak-to-peak voltage swings. The integrated charge pump eliminates the need for external inductors, simplifying layout. Consider the 28-pin TQFN package for its thermal efficiency and small form factor. Verify that the application benefits from the linear Class G topology's audio quality compared to switching amplifiers.

Audio Amplifiers Part Context

This device belongs to the MAX9788 family of audio amplifiers. It is specifically engineered to drive the high capacitance of ceramic loudspeakers found in portable electronics. The ETI suffix denotes the 28-pin Thin Quad Flatpack (TQFN) package with an exposed pad. The '+' indicates a lead-free manufacturing process compliant with environmental standards.

Audio Amplifiers Replacement Considerations

MAX9788EWP+TG45: Offers identical functionality but utilizes a 20-bump WLP package instead of the TQFN.

Audio Amplifiers FAQ

How does the Class G operation improve efficiency?

The amplifier operates in a low supply range (VCC to GND) for small signals and transitions to a high supply range (VCC to SVSS) for large signals, maintaining high efficiency similar to Class AB devices without the EMI associated with Class D amplifiers.

What is the purpose of the series load resistor?

A series load resistor (recommended >10Ω) prevents the ceramic speaker from acting as an electrical short at high frequencies due to its capacitive nature, ensuring stable amplifier operation.