IS31AP4991A-SLS2-TR

Overview

The IS31AP4991A-SLS2-TR is a monolithic Class-AB audio power amplifier manufactured by Lumissil Microsystems in an MSOP-8 package. It delivers 1.1W continuous RMS output power into an 8Ω load at 5V supply voltage. The device operates from a VCC range of 2.7V to 5.5V and features an active-low shutdown mode that reduces supply current to less than 1μA. Key electrical characteristics include a typical quiescent current of 3.0mA, a shutdown input high voltage of 1.4V, and a shutdown input low voltage of 0.4V. It provides 56dB PSRR at 217Hz and maintains near-zero click-and-pop performance.

Feature Summary

• Features an externally controlled standby mode with ultra-low consumption for extended battery life in portable devices.
• Incorporates internal thermal shutdown protection to ensure operational safety under stress conditions.
• Delivers high-fidelity audio with ultra-low distortion and near-zero pop-and-click artifacts during power transitions.

Applications

• Mobile phones
• Portable electronic devices
• Notebook computers

Procurement Notes

Verify the specific ordering suffix SLS2-TR confirms the MSOP-8 lead-free package and tape-and-reel quantity of 2500 units. Ensure compatibility with industrial temperature ranges (-40°C to +85°C) required for the target application environment. Confirm RoHS and Halogen-Free compliance status matches project specifications before finalizing procurement orders.

Selection Notes

Select this component for single-channel mono audio applications requiring bridge-tied load (BTL) configuration. It is suitable for designs needing gain adjustment via external resistors while minimizing external component count. Consider the wake-up time dependency on bypass capacitor sizing when designing power sequencing circuits for rapid startup requirements.

Part Context

This part belongs to the IS31AP4991A series of 1.1W audio power amplifiers. The -SLS2-TR suffix specifically denotes the MSOP-8 surface-mount package variant, distinct from the SOP-8 version (-GRLS2-TR). The series is designed for mobile and portable electronics where space constraints and power efficiency are critical design parameters.

Replacement Considerations

Public datasheets list LM4861, LM4870, LM4871, and PA4871 as functionally similar 1.1W amplifiers with shutdown modes. Verify pinout compatibility and electrical parameter alignment before substitution.

FAQ

How does the shutdown mode affect the device's power consumption?

When a low level is applied to the SDB pin, the device enters standby mode, reducing the supply current to much less than 1μA.

What determines the wake-up time of the amplifier?

The wake-up time is determined by the charging speed of the bias voltage bypass capacitor (CBYPASS), which typically takes between 100ms and 250ms with a 0.47μF capacitor.