NCP4894MNR2G

Overview

The NCP4894MNR2G 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 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, and superior PSRR allowing direct battery connection.

Feature Summary

• Differential amplification architecture eliminates the need for output coupling capacitors
• Selectable shutdown mode logic allows flexibility in system control integration
• Integrated circuitry prevents audible 'pop and click' noises during power transitions
• High power supply rejection ratio enables direct connection to unregulated battery sources

Applications

• Mobile phones
• Personal Digital Assistants (PDAs)
• Portable electronic devices

Procurement Notes

Verify that the specific ordering suffix matches the required lead-free soldering process, as indicated by the G suffix. Confirm package availability aligns with design constraints, noting this variant uses the DFN10 format. Ensure compatibility with existing PCB assembly workflows regarding Pb-free requirements. Cross-reference the manufacturer's documentation for tape and reel specifications to validate component orientation and packaging dimensions before finalizing procurement orders.

Selection Notes

Select this component when designing portable audio systems requiring high efficiency and minimal external parts count. The differential output structure simplifies board layout by removing large output capacitors. Consider the external bypass capacitor value carefully, as it directly influences turn-on time and pop-noise performance. Verify that the chosen gain-setting resistors maintain stability within the recommended closed-loop gain range to optimize signal-to-noise ratio and minimize distortion across the operating voltage spectrum.

Part Context

This device belongs to the NCP4894 series of audio power amplifiers manufactured by onsemi. It is specifically engineered for mobile applications where space and power consumption are critical constraints. The series offers multiple package options including Flip-Chip, Micro-10, and DFN10 to accommodate various form factors. The MNR2G designation identifies the specific lead-free DFN10 package variant within this product family.

Replacement Considerations

NCP4894DMR2G

FAQ

How does the shutdown function operate?

The device enters shutdown mode when the SD SELECT and SD MODE pins are set to the same logic state. This configuration allows the shutdown threshold to be selected as either high or low based on the permanent connection of the SD MODE pin.

What mechanism prevents audible noise during startup?

The NCP4894 incorporates internal circuitry that slowly establishes the output DC level around the common mode voltage before applying gain. This controlled turn-on sequence, influenced by the bypass capacitor, effectively eliminates 'pop and click' noises.

Can the amplifier be connected directly to a battery?

Yes, due to its superior Power Supply Rejection Ratio (PSRR), the NCP4894 can be directly connected to the battery without requiring an LDO regulator, which helps save board space and reduce component count.