STMicroelectronics TS4984IQT

Overview

TS4984IQT from STMicroelectronics is a 2 × 1W stereo audio power amplifier IC in BTL configuration, delivering 1W per channel into 8Ω at 5V with THD+N ≤ 1%, 100dB(A) SNR, and 62dB PSRR @ 217Hz - deployed in portable LCD monitors, notebook computers, and cellular handsets for high-fidelity speaker drive with ultra-low standby current.

For engineers reviewing the TS4984IQT datasheet, TS4984IQT pinout, TS4984IQT application, or TS4984IQT equivalent, key selection criteria include BTL output architecture, 10nA active-low standby current, QFN16 4×4 mm thermal performance (R_thJA = 45°C/W on 4-layer PCB), gain-setting via external resistors, and thermal shutdown protection.

Technical Context

The TS4984IQT integrates two fully independent Class-AB BTL amplifiers with externally configurable closed-loop gain (AV = 2 × R_FEED/R_IN) and internal bias generation. Each channel features rail-to-rail input common-mode range (1.2V to V_CC) and differential outputs capable of ±1.8V swing into 8Ω at 5V supply.

It employs an active-low STBY control pin enabling <10nA per-channel quiescent current, with wake-up time of 90–130ms (C_B = 1µF) and sub-10µs standby entry. Thermal shutdown triggers at 150°C junction temperature, and stability is ensured by ≥65° phase margin with 500pF load capacitance.

Key Specifications

Pinout & Package

TS4984IQT uses a lead-free QFN16 package (4mm × 4mm, 0.5mm pitch, exposed thermal pad). Pin numbering follows top-view layout with pins 1–8 on bottom row (left to right), 9–16 on top row (right to left).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPA2013D1RTJR and MAX9718ETA+, TS4984IQT uniquely balances programmable gain, 10nA standby, and 62dB PSRR - making it optimal for thermally constrained, battery-sensitive portable displays requiring design flexibility and noise robustness.

Availability

TS4984IQT is available at Aetrix Electronics and suitable for LCD monitor audio subsystems, notebook computer speaker drivers, and cellular handset loudspeaker interfaces requiring stable component supply across industrial temperature ranges (−40°C to +85°C).

Supply support for TS4984IQT 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 analog, mixed-signal, and power ICs for automotive, industrial, and consumer markets.

The TS4984 belongs to ST's high-efficiency audio power amplifier product line, engineered specifically for space-constrained portable electronics needing high-output power, ultra-low quiescent current, and robust EMI immunity without external filters.

FAQ

What is the minimum recommended bypass capacitor value for the BYPASS pins?

The datasheet specifies 1µF ceramic capacitor per BYPASS pin (BYPASS L and BYPASS R) to ensure stable half-supply bias and suppress pop/click artifacts during power-up and standby transitions. Using <1µF increases risk of audible transients and gain instability, especially at AV ≥ 5. X7R dielectric and 0603 or larger case size are recommended for low ESR and temperature stability.

Can TS4984IQT drive 4Ω loads reliably?

Yes - the device is rated for R_L ≥ 4Ω per channel. At 5V supply, it delivers 1.4W into 4Ω (THD+N = 1%), with thermal derating required above 25°C ambient. On a 4-layer PCB with thermal vias, maximum continuous output is 1.1W at 50°C ambient. For sustained 4Ω operation, ensure copper pour under the exposed pad covers ≥120 mm² and avoid stacking signal layers directly above the thermal pad.

How does the STBY pin behave during power sequencing?

STBY is an active-low, CMOS-compatible input with V_STDBL ≤ 0.4V (max) for standby and V_STDBH ≥ 1.35V (min) for active mode. It must be driven after V_CC stabilizes; applying STBY low before V_CC reaches 2.2V may cause undefined behavior. Internal pull-down ensures safe default-to-standby if left floating, but external pull-down resistor (100kΩ) is recommended for deterministic startup.

Is external compensation required for stability?

No - the TS4984IQT is internally compensated for unity-gain stability with capacitive loads up to 500pF. Stability is verified across all supply voltages (2.2V–5.5V) and gains (AV = 2–10) when using recommended layout: short traces to BYPASS/IN+/IN− pins, ground plane under QFN pad, and 1µF local C_S at each V_CC pin. Adding series resistance (>5Ω) in feedback path or excessive trace inductance may degrade phase margin.