LM4961LQ/NOPB

Audio Amplifiers Overview

The LM4961LQ/NOPB is a ceramic speaker driver featuring an integrated boost converter and Class-AB audio amplifier. It delivers a 15Vp-p BTL output swing to a 2μF+30Ω load with less than 1% THD+N from a 3.2V supply. The device operates on a single supply voltage between 3.0V and 5.0V, drawing a typical quiescent current of 7mA. Shutdown current is typically 0.1μA. It includes thermal shutdown protection at 125°C and pop/click elimination circuitry.

Audio Amplifiers Feature Summary

• Integrates a variable output voltage boost converter for driving capacitive ceramic speakers without bootstrap capacitors.
• Features advanced click and pop circuitry that eliminates noise during turn-on and turn-off transitions.
• Includes a band switch function allowing configuration for both receiver mode and ringer/loudspeaker mode.
• Provides low current shutdown mode and internal thermal shutdown protection.

Audio Amplifiers Applications

• Cellphones
• PDAs

Audio Amplifiers Procurement Notes

Verify the specific package marking NJB0028A corresponds to the 5x5 WQFN format. Confirm the LQ suffix indicates the qualified version if required by your design specifications. Ensure input signals remain within VDD + 0.3V limits to prevent damage.

Audio Amplifiers Selection Notes

Select this component when driving high-voltage capacitive loads like ceramic speakers directly from a single battery source. It is suitable for designs requiring differential drive without output coupling capacitors. Consider the external gain configuration capability and the need for feed-forward compensation for the boost converter stability.

Audio Amplifiers Part Context

This part belongs to the LM4961 family of Boomer audio power amplifiers designed for portable applications. It combines a switching DC-DC converter with a mono audio amplifier to provide high output power in a minimal component count environment.

Audio Amplifiers Replacement Considerations

LM4961MX/NOPB

Audio Amplifiers FAQ

How does the Band-SW pin affect operation?

Applying a logic high (VDD) enables the boost converter for ringer mode, while a logic low (GND) disables it for receiver mode, powering the amp directly from the battery.

What is the purpose of the exposed DAP in the package?

The exposed die attach paddle provides a low thermal resistance path to the PCB copper pad, acting as a heat sink to dissipate internal power.