NCP4894MNR2

Overview

The NCP4894MNR2 is a differential audio power amplifier designed for portable communication devices. It delivers 1.0 W to an 8 Ω load from a 5.0 V supply with less than 0.01% distortion, and up to 1.8 W continuous average power at 10% THD+N from a 5.5 V source. Operating between 2.2 V and 5.5 V, it features ultra-low shutdown current (typical 10 nA), selectable high/low shutdown logic, and external gain configuration via resistors. The device includes pop-and-click noise protection, thermal overload protection set at 160°C, and superior PSRR allowing direct battery connection.

Feature Summary

• Differential amplification architecture eliminates the need for output coupling capacitors
• Configurable shutdown mode with selectable high or low logic selectivity
• Integrated circuitry prevents audible pop and click noises during transitions
• High power supply rejection ratio enables direct connection to battery sources

Applications

• Portable electronic devices
• Personal digital assistants (PDAs)
• Mobile phones

Procurement Notes

Verify the specific suffix 'MNR2' corresponds to the DFN10 package variant when sourcing. Confirm lead-free status if required by assembly processes, as indicated by the 'G' suffix in ordering information. Ensure PCB heatsink area requirements are met for the flip-chip variants if considering alternative packages within the same family. Validate input coupling and bypass capacitor values against application notes to maintain specified performance metrics.

Selection Notes

Select this component for applications requiring high-quality audio with minimal external components. The differential output allows for higher power delivery compared to single-ended configurations under identical conditions. Consider the external gain setting resistors to optimize signal-to-noise ratio and minimize total harmonic distortion. Ensure the operating voltage range aligns with the system's battery specifications, noting the device functions effectively down to 2.2 V.

Part Context

This device belongs to the NCP4894 series of audio power amplifiers manufactured by onsemi. The series includes variants such as NCP4894FCT1G and NCP4894DMR2G, which share similar functional characteristics but differ in packaging options like 9-Pin Flip-Chip and Micro-10. The NCP4894MNR2 specifically utilizes the DFN10 3x3 mm package, offering a compact solution for space-constrained portable electronics while maintaining the core amplifier performance specifications defined in the datasheet.

Replacement Considerations

NCP4894MNR2G

FAQ

How is the shutdown function configured?

Shutdown is enabled when the SD SELECT pin matches the state of the SD MODE pin. The SD MODE pin must be permanently connected to either VP or GND on the PCB.

What protects the device from excessive heat?

Thermal overload protection switches off the internal amplifiers when the junction temperature exceeds 160°C, re-enabling them only when the temperature drops below 140°C.

Why is a bypass capacitor recommended?

The bypass capacitor provides half-supply filtering and determines the turn-on time. A 1.0 µF value is recommended to minimize turn-on pop and click noises.