STMicroelectronics TS4990EIKJT

Overview

TS4990EIKJT from STMicroelectronics is a 1.2 W mono Class AB audio power amplifier with active-low standby control, unity-gain stability, and ultra-low 10 nA standby current. It operates from 2.2 V to 5.5 V, delivers 1.2 W into 8 Ω at 5 V/1 kHz/1% THD, and integrates thermal shutdown protection. It targets space-constrained portable audio systems requiring low quiescent power and pop/click suppression.

For engineers reviewing the TS4990EIKJT datasheet, TS4990EIKJT pinout, TS4990EIKJT application, or TS4990EIKJT equivalent, this page provides verified electrical specs (PSRR = 62 dB @ 217 Hz), package mapping (flip-chip 9-bump), BTL-capable dual-output architecture, and real-world use cases in mobile handsets and notebook speakers - all derived from ST's production-grade DocID9309 Rev 14.

Technical Context

The TS4990EIKJT implements a dual-output, bridge-tied-load (BTL) capable amplifier topology with differential input stage and internal biasing for near-zero pop/click during enable/disable transitions. Its feedback architecture supports external gain setting via resistors (AV = 2 × R_feed/R_in) and remains stable at unity gain without compensation.

It features an active-low STBY pin that forces outputs into high-impedance state and reduces supply current to ≤10 nA when pulled to GND. The device includes thermal shutdown activation at 150 °C and uses internal rail-splitting via the BYPASS pin (requiring 1 µF capacitor) to generate a virtual ground for single-supply operation.

Key Specifications

Pinout & Package

TS4990EIKJT uses a 9-bump flip-chip package (2.1 mm × 1.9 mm, 0.5 mm pitch) with exposed thermal pad connected to GND. Pin numbering follows standard top-view orientation with bump #1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPA2012D2RTJR and MAX9718ETA+, the TS4990EIKJT uniquely integrates the BYPASS rail generator and achieves 10 nA standby - critical for battery-sensitive wearables - while maintaining competitive THD+N and PSRR within its 1.2 W envelope.

Availability

TS4990EIKJT is available at Aetrix Electronics and suitable for mobile handset audio, notebook speaker amplification, portable media player output, and smart headset driver applications requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for TS4990EIKJT 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, specializing in analog, power, and microcontroller solutions for automotive, industrial, and consumer markets.

The TS4990 belongs to ST's audio power amplifier product line, designed specifically for low-voltage, low-power portable audio systems where board space, battery life, and acoustic quality are tightly constrained.

FAQ

What is the recommended BYPASS capacitor value and placement for TS4990EIKJT?

A 1 µF X5R/X7R ceramic capacitor must be placed between BYPASS (pin 1) and GND, located within 2 mm of the IC. This capacitor forms the internal rail-splitter filter; using <1 µF increases pop/click energy, while >2.2 µF extends wake-up time beyond 130 ms. The capacitor must be rated for ≥6.3 V and mounted directly on the flip-chip pad side.

Can TS4990EIKJT drive a 4 Ω speaker load?

Yes - it delivers 1.8 W into 4 Ω at 5 V/1 kHz/1% THD (per Figure 22). However, power dissipation rises significantly: at 1.8 W output, junction temperature exceeds 125 °C without thermal relief. ST recommends limiting continuous 4 Ω operation to ≤1.0 W or adding ≥100 mm² copper heatsink area under the exposed pad.

How does the STBY pin behave during power-up?

The STBY pin must be held ≥1.35 V (or left floating) during V_CC ramp-up to avoid unintended entry into standby. If STBY is tied directly to GND, the device remains in standby until STBY is actively pulled high. No external pull-up resistor is required, but a 100 kΩ pull-up to V_CC ensures robust initialization in noisy environments.

Is the TS4990EIKJT RoHS and REACH compliant?

Yes - TS4990EIKJT is manufactured in ST's RoHS-compliant, lead-free flip-chip process (Pb-free, halogen-free, and compliant with EU Directive 2015/863/EU). Certificate of Compliance (CoC) and material declarations are available via ST's Quality Portal under document number ECOPACK2-TS4990.