STMicroelectronics TS4998IQT

Overview

TS4998IQT from STMicroelectronics is a 2-channel, 1W differential-input stereo audio power amplifier in QFN16 4×4mm package, operating from 2.7V to 5.5V supply, delivering 1W per channel into 8Ω at 5V with 1% THD+N, ultra-low 10nA standby current per channel, and integrated thermal shutdown protection.

For engineers reviewing the TS4998IQT datasheet, TS4998IQT pinout, TS4998IQT application, or TS4998IQT equivalent, this device supports BTL output configuration, dual independent standby control (STBYL/STBYR), differential input architecture for high CMRR, and gain-setting via external resistors - critical for portable audio system design requiring low-noise, pop-free startup, and efficient power management.

Technical Context

The TS4998IQT implements a fully differential input stage with internal common-mode feedback, enabling optional input coupling capacitors and stable operation across varying common-mode input voltages (GND to VCC−1V). Its BTL output topology eliminates DC-blocking capacitors at speaker outputs while maintaining rail-to-rail swing capability.

Each channel features independent standby control logic tied to dedicated STBYL/STBYR pins, reducing quiescent current to ≤10nA per channel when pulled low; wake-up time is 46ms typical with 1µF bypass capacitor. Gain is externally programmable (e.g., +6dB, +12dB) using resistor dividers against a fixed 50kΩ internal feedback network.

Key Specifications

Pinout & Package

TS4998IQT uses a lead-free QFN16 4×4mm package with exposed thermal pad (EP) for enhanced heat dissipation in space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar stereo audio amplifier applications.

Compared with TAS5342AIDBTR and TPA2013D1YZFT, the TS4998IQT offers superior PSRR (80dB), true differential input architecture, and per-channel standby control - making it uniquely suited for noise-sensitive, low-power portable systems where analog signal integrity and precise power gating are essential.

Availability

TS4998IQT is available at Aetrix Electronics and suitable for cellular mobile phones, notebook computers, and portable audio devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TS4998IQT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, power management devices, and MEMS sensors for automotive, industrial, and consumer markets.

The TS4998 belongs to ST's high-performance audio amplifier product line, engineered specifically for space-constrained portable electronics demanding low-voltage operation, ultra-low standby power, and robust acoustic performance without external passive filtering.

FAQ

What is the minimum recommended load impedance for TS4998IQT?

The TS4998IQT is specified for loads ≥4Ω per channel. Driving 4Ω loads delivers up to 1.4W per channel at 5V (THD+N ≤1%), but thermal derating must be applied above ambient temperatures of 60°C due to increased power dissipation. For sustained 8Ω operation, no derating is required up to +85°C ambient.

Can TS4998IQT operate with single-ended inputs?

Yes - the TS4998IQT supports single-ended input configuration by connecting one side of each differential pair (e.g., LIN−, RIN−) to the BIAS pin, while applying the signal to LIN+ and RIN+. This maintains common-mode stability and preserves >57dB CMRR, though differential mode provides optimal noise rejection and PSRR.

Is an external bypass capacitor mandatory on the Bypass pin?

Yes - a 1µF ceramic capacitor must be placed between the Bypass pin and GND. This capacitor establishes the internal half-supply reference used for common-mode feedback and output stage biasing; omission causes severe distortion, offset drift, and potential instability in both channels.

How does thermal shutdown behave during continuous operation?

When junction temperature reaches 150°C, TS4998IQT disables both output stages and enters thermal shutdown. It remains latched off until temperature drops below ~135°C, then automatically resumes normal operation. No external reset or power cycle is required, and the device retains full functionality after recovery.