TS419/TS421 is a monaural audio power amplifier driving in BTL mode a 16 or 32Ω earpiece or receiver speaker. The main advantage of this configuration is to get rid of bulky ouput capacitors. Capable of descending to low voltages, it delivers up to 220mW per channel (into 16Ω loads) of continuous average power with 0.2% THD+N in the audio bandwidth from a 5V power supply. An externally controlled standby mode reduces the supply current to 10nA (typ.). The TS419/TS421 can be configured by external gain-setting resistors or used in a fixed gain version.
The document describes the TS419 and TS421 as monaural audio power amplifiers designed to drive 16 or 32Ω earpieces or receiver speakers in a Bridge-Tied Load (BTL) mode. A key feature is their ability to operate from low supply voltages ranging from 2V to 5.5V, delivering up to 367mW into a 16Ω load at 5V with maximum 10% THD+N. The devices include an externally controlled standby mode that significantly reduces supply current to as low as 10nA for the TS421.
| Supply Voltage Range | 2V to 5.5V |
|---|---|
| Output Power (16Ω, 5V) | 367mW @ 10% THD+N |
| Output Power (16Ω, 3.3V) | 110mW |
| Standby Current (TS421) | 10nA typ. |
| Signal-to-Noise Ratio | 95dB(A) at 5V |
| Power Supply Rejection Ratio (PSRR) | 56dB typ. at 1kHz |
| Supply Current (No Load) | 2.5mA max |
The standby mode for the TS419 is active high, reducing supply current to 10nA typical.
The TS419/TS421 is available in SO8, MiniSO8, and DFN 3x3 packages.
It is designed for driving 16/32 ohm earpiece or receiver speakers in mobile phones, PDAs, and portable appliances.