NCP2809BMUTXG

Overview

The NCP2809BMUTXG is a stereo Class-AB audio power amplifier manufactured by onsemi, designed for low-voltage portable systems. It delivers up to 135 mW of continuous average power per channel into 16 Ω loads from a 5.0 V supply. The device operates within a voltage range of 2.2 V to 5.5 V and features an ultra-low shutdown current of 600 nA maximum. It incorporates pop-and-click noise protection, thermal overload protection, and high power supply rejection ratio (PSRR) of 85 dB typical. The component is housed in a Micro10 UDFN-10 package.

Feature Summary

• Eliminates the need for bootstrap capacitors or snubber networks, optimizing suitability for low-power portable designs.
• Provides excellent power supply rejection ratio allowing direct connection to battery sources without requiring an LDO regulator.
• Includes integrated circuitry for pop and click noise protection during turn-on and turn-off transitions.

Applications

• Cellular phones
• Portable stereo devices
• MP3 players
• Personal computers
• Notebook computers

Procurement Notes

Verify the specific ordering suffix 'MU' corresponds to the required UDFN-10 package configuration before procurement. Confirm that the 'B' variant designation aligns with the intended external gain setting requirements for the application design. Ensure compliance with RoHS directives as indicated by the Pb-Free package marking. Check for any recent product change notifications regarding manufacturing updates.

Selection Notes

Select this model when an external gain configuration is required, distinguishing it from the fixed-gain NCP2809A variant. Consider the UDFN-10 package dimensions if space constraints are critical compared to the Micro10 option. Evaluate the 2.2 V minimum operating voltage against the system's lowest expected battery level. Verify that the 250 mA output current limit meets the peak drive requirements of the connected headset impedance.

Part Context

This component belongs to the NCP2809 series of stereo headphone amplifiers. The series includes variants such as NCP2809A with fixed internal gain and NCP2809B which allows for external gain setting. The NCP2809BMUTXG specifically denotes the B-series version packaged in the MU suffix UDFN-10 format. This family targets cost-effective audio solutions for mobile consumer electronics.

Replacement Considerations

The NCP2809AMUTXG serves as a functional substitute if a fixed 0 dB internal gain is acceptable instead of external gain configuration. Designers must verify pin compatibility and ensure the gain-setting resistor network is removed or bypassed when switching between these variants.

FAQ

How does the NCP2809BMUTXG handle startup transients?

The device features a dedicated pop and click noise protection circuit that slowly establishes gain and DC levels during turn-on to eliminate audible transition noises.

What is the function of the REF_I pin in NOCAP configurations?

In applications without output coupling capacitors, the REF_I pin sets the stereo headset ground reference and should be connected close to the headset connector ground to minimize crosstalk.