TS419IQT

Overview

The TS419IQT is a monaural audio power amplifier in an 8-pin DFN package. It operates from a supply voltage of 2V to 5.5V and drives 16 or 32 ohm loads in BTL mode. At 5V, it delivers up to 367mW into 16 ohms with 10% THD+N. The standby current reduces to 10nA typical. Key electrical parameters include a signal-to-noise ratio of 95dB(A) at 5V, a maximum supply current of 2.5mA, and a power supply rejection ratio of 56dB at 1kHz.

Feature Summary

• Capable of driving earpieces or receiver speakers in bridge-tied-load (BTL) configuration without bulky output capacitors.
• Features an externally controlled active-high standby mode that significantly reduces supply current consumption.
• Includes ON/OFF click reduction circuitry to minimize audible switching noise during power transitions.

Applications

• Mobile and cordless phones
• PDAs and computers
• Portable appliances

Procurement Notes

Verify the specific ordering suffix 'Q' corresponds to the required MiniSO8 or DFN 3x3 tape and reel packaging format. Confirm the active-high standby logic aligns with system control requirements. Ensure thermal dissipation calculations account for the specific PCB layout and ambient operating temperature range.

Selection Notes

Select this component for low-voltage mono audio applications requiring high efficiency and minimal external components. Consider the fixed gain options if external resistors are undesirable. Evaluate the thermal resistance characteristics against the expected power dissipation levels in the target enclosure design.

Part Context

This device belongs to the TS419/TS421 family of Class-AB audio amplifiers designed for portable electronics. The TS421 variant offers an active-low standby mode, while the TS419 utilizes active-high control. Both share identical electrical performance characteristics and pin configurations.

Replacement Considerations

The TS421IQT serves as a direct functional substitute within the same family, differing only in the standby control polarity requirement.