STMicroelectronics TS4990EIJT

Overview

TS4990EIJT from STMicroelectronics is a 1.2 W mono Class AB audio power amplifier with active-low standby control, designed for space-constrained portable audio systems. It delivers 1.2 W RMS into 8 Ω at 5 V, achieves 0.1% THD+N, consumes only 10 nA in standby, and operates from 2.2 V to 5.5 V supply - enabling direct integration in mobile phone loudspeaker drive paths.

For engineers reviewing the TS4990EIJT datasheet, TS4990EIJT pinout, TS4990EIJT application, or TS4990EIJT equivalent, this page provides verified package mapping (9-bump flip-chip), confirmed BTL-capable dual-output architecture, thermal shutdown protection, unity-gain stability with external resistors, and real-world pop/click suppression performance data.

Technical Context

The TS4990EIJT implements a dual-output, bridge-tied-load (BTL) amplifier topology where VOUT1 and VOUT2 drive opposite phases of a single speaker, doubling effective voltage swing and eliminating output coupling capacitors. Its internal biasing supports rail-to-rail input common-mode range (1.2 V to VCC) and enables differential input configuration.

Standby mode is asserted by pulling STBY low (≤0.4 V), disabling output stages and reducing ICC to ≤10 nA; wake-up time is 90–130 ms with 1 µF bypass capacitor. PSRR reaches 62 dB at 217 Hz under grounded-input conditions, and phase margin remains ≥65° with 500 pF load capacitance.

Key Specifications

Pinout & Package

TS4990EIJT uses a 9-bump flip-chip package (2.1 mm × 1.9 mm, 0.4 mm pitch), optimized for ultra-compact PCB layouts and thermal performance via direct die attachment. The exposed die pad is electrically connected to GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPA2012D2RTJR and MAX9718ETA+, the TS4990EIJT offers superior standby efficiency (10 nA vs. µA), full external gain control, and integrated thermal protection - making it optimal for battery-sensitive, space-constrained, and thermally unmanaged portable designs.

Availability

TS4990EIJT is available at Aetrix Electronics and suitable for mobile handset audio, laptop speaker amplification, portable media player output, and VoIP handset loudspeaker drive requiring stable component supply across long production lifecycles.

Supply support for TS4990EIJT 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, specializing in analog, microcontrollers, power management, and automotive ICs.

The TS4990 belongs to ST's low-voltage audio amplifier product line, engineered specifically for ultra-low-power, capacitorless BTL speaker drive in battery-operated portable devices with stringent size and thermal constraints.

FAQ

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

The BYPASS pin requires a 1 µF ceramic capacitor connected to GND to ensure stable internal bias generation and minimize pop/click transients during power-up and standby transitions. Using <1 µF increases risk of audible artifacts and may degrade PSRR performance at 217 Hz.

Can TS4990EIJT drive a 4 Ω speaker load?

Yes - the TS4990EIJT supports RL ≥ 4 Ω. At 5 V supply, it delivers up to 1.8 W into 4 Ω (THD = 10%), and 1.0 W at THD = 1%. Thermal derating must be observed: maximum continuous power into 4 Ω is limited by junction temperature rise on the target PCB layout.

How does the STBY pin behave during power-up?

The STBY pin defaults to high-impedance during power-up; the amplifier remains disabled until STBY is actively pulled above 1.35 V. To prevent unintended output activation, tie STBY to VCC through a 100 kΩ resistor or drive it from a controlled GPIO after VCC stabilizes.

Is external compensation required for unity-gain operation?

No - the TS4990EIJT is unity-gain stable with capacitive loads up to 500 pF. No external compensation components are needed for AV = 1 configurations; stability is maintained across all specified supply voltages and load conditions per production-tested phase/gain margin data.