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STMicroelectronics DEMOTS4990Q

Name: DEMOTS4990Q
Brand: STMicroelectronics
SKU: DEMOTS4990Q
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DEMOTS4990Q

Manufacturer:: STMicroelectronics

Category:: Audio Amplifier Evaluation Boards

Package:

Datasheet:: DEMOTS4990Q.pdf

Description:: EVAL BOARD FOR TS4990

Quantity:: RFQ Add To RFQ list

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Inventory:1,465

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Product details

Overview

TS4990 from STMicroelectronics is a 1.2 W mono Class AB audio power amplifier with active-low standby control, unity-gain stability, and BTL output configuration for driving 8 Ω speakers. It operates from 2.2 V to 5.5 V, delivers 1.2 W RMS at 5 V/1 kHz/THD = 1%, and consumes only 10 nA in standby mode. Used in space-constrained portable audio systems requiring low pop/click and high PSRR.

For engineers reviewing the TS4990 datasheet, TS4990 pinout, TS4990 application, or TS4990 equivalent, this page provides verified electrical specs, package-specific pin mapping, real-world BTL implementation guidance, thermal derating curves, and validated alternative options for mobile phone, notebook, and PDA audio subsystems.

Technical Context

The TS4990 integrates dual rail-to-rail output stages in bridge-tied-load (BTL) topology, enabling single-supply operation without output coupling capacitors. Its internal thermal shutdown activates at 150 °C, and it supports external gain setting via resistive feedback networks (e.g., R_feed/R_in) with AV = 2 × (R_feed/R_in) in BTL mode.

It features a dedicated bypass pin (Cb) for half-supply generation, ultra-low standby current (10 nA), near-zero pop/click suppression circuitry, and 62 dB PSRR at 217 Hz under grounded-input conditions - critical for GSM noise immunity in cellular handsets.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	1.2 W RMS into 8 Ω at V_CC = 5 V, THD = 1%, 1 kHz - sufficient for loudspeaker drive in compact handhelds.
Supply Voltage Range	2.2 V to 5.5 V - compatible with Li-ion, Li-poly, and dual-cell alkaline battery systems.
Standby Current	10 nA typical - enables multi-week battery standby in always-on audio subsystems.
PSRR @ 217 Hz	62 dB - rejects GSM burst noise without additional filtering in mobile phone baseband designs.
THD + N	0.1% typical at 400 mW, 20 Hz–20 kHz - meets fidelity requirements for voice and media playback.
Gain Bandwidth Product	1.5 MHz - supports stable closed-loop gain configurations up to AV = 10 with adequate phase margin.
Wake-up Time	90–130 ms (with C_b = 1 µF) - balances fast audio resumption against pop suppression.

Pinout & Package

TS4990 is available in DFN8 (3 × 3 mm), miniSO-8, SO-8, and 9-bump flip-chip packages. Pin functions are identical across variants; DFN8 exposes pad 7 to GND for thermal enhancement.

Pin/Terminal	Circuit Role	Design Meaning
1: STBY	Active-low standby control input	Pulled low (≤ 0.4 V) to enter 10 nA standby; pulled high (≥ 1.35 V) to enable operation.
2: BYPASS	Half-supply decoupling node	Connects to 1 µF capacitor to generate stable V_CC/2 reference for AC-coupled inputs.
3: VIN+	Non-inverting input	Accepts differential or single-ended audio signals; common-mode range: 1.2 V to V_CC.
4: VIN−	Inverting input	Completes differential input pair; sets gain with external R_feed/R_in network.
5: VOUT1	BTL output channel 1	Drives one side of speaker load; swing limited to V_CC − 0.7 V (high) / 0.3 V (low).
6: GND	Power and signal ground	Primary return path; DFN8 exposed pad (pin 7) must be soldered to PCB GND plane.
7: VCC	Positive supply input	Accepts 2.2–5.5 V; requires local 1 µF ceramic bypass capacitor to GND.
8: VOUT2	BTL output channel 2	Drives opposite speaker terminal; 180° out-of-phase with VOUT1 for net 2× voltage swing.

Key Features

Feature	Design Value
Unity-gain stable architecture	Eliminates need for external compensation; supports AV = 1 to 10 with standard RC feedback.
Thermal shutdown protection	Auto-shutdown at 150 °C junction temperature; resumes after cooldown - prevents IC destruction during overload.
Near-zero pop and click	Internal soft-start and bias sequencing reduce transient artifacts during power-up/down - no external mute required.
Ultra-low distortion	0.1% THD+N at mid-power (400 mW) ensures clean voice reproduction and minimal harmonic interference.
High PSRR at 217 Hz	62 dB rejection of GSM fundamental frequency enables direct integration into cellular RF-sensitive layouts.

Applications

Mobile Handset Audio

Notebook Speaker Amplification

Use Scenario: Driving mono loudspeaker in LTE smartphone with shared battery rail and tight EMI constraints.

IC Role / Device Role / Timing Role: BTL audio power amplifier with active-low standby synchronized to application processor sleep states.

Use Value: 10 nA standby current extends standby time; 62 dB PSRR suppresses 217 Hz GSM noise without shielded layout.

Use Scenario: Boosting audio output from codec DAC to 8 Ω laptop speaker with minimal board area.

IC Role / Device Role / Timing Role: Single-chip mono amplifier eliminating bulky output capacitors via BTL topology.

Use Value: 1.2 W output at 5 V enables louder playback; unity-gain stability simplifies gain-setting resistor selection.

PDA Media Playback

Portable Bluetooth Speaker

Use Scenario: Low-voltage audio amplification in legacy PDA with 3.3 V logic supply and 8 Ω speaker.

IC Role / Device Role / Timing Role: Efficient Class AB amplifier operating down to 2.2 V while maintaining <0.2% THD+N.

Use Value: 500 mW output at 3.3 V sustains audible volume; thermal shutdown protects against enclosure overheating.

Use Scenario: Compact battery-powered Bluetooth speaker requiring low quiescent current and pop-free startup.

IC Role / Device Role / Timing Role: Standby-controlled amplifier activated on Bluetooth connection event via microcontroller GPIO.

Use Value: 90 ms wake-up time enables responsive audio start; near-zero pop eliminates need for external muting circuitry.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX9718ETA+	Higher 1.4 W output (5 V/8 Ω), but 2 µA standby current - 200× higher than TS4990's 10 nA.	Preferred where peak output >1.2 W is critical; unsuitable for ultra-low-power always-on use cases.	Select MAX9718 when output power margin outweighs standby current sensitivity.
TAS5706PAG	Digital-input Class D amplifier (I²S), 3 W output, but requires external DC-DC converter and digital interface.	Suited for systems with existing I²S infrastructure and thermal constraints; not pin-compatible or functionally drop-in.	Choose TAS5706 for higher efficiency (>85%) in thermally limited enclosures, accepting added system complexity.

Compared with MAX9718ETA+ and TAS5706PAG, TS4990 uniquely balances ultra-low standby current (10 nA), analog simplicity (no clock/data lines), and proven GSM-noise immunity - making it optimal for cost-sensitive, battery-limited portable audio where analog integration and EMI robustness are prioritized over peak power or efficiency.

Availability

TS4990 is available at Aetrix Electronics and suitable for mobile handset audio, notebook speaker amplification, PDA media playback, and portable Bluetooth speaker designs requiring stable component supply across long production lifecycles.

Supply support for TS4990 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, MCU, power, and sensor solutions for automotive, industrial, and consumer markets.

The TS4990 belongs to ST's audio power amplifier product line, engineered specifically for space-constrained portable electronics demanding low-voltage operation, ultra-low standby consumption, and high PSRR in noisy RF environments.

FAQ

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

The datasheet specifies 1 µF as the standard value for C_b, yielding 90–130 ms wake-up time and optimal pop suppression. Using 0.1 µF reduces wake-up time but degrades PSRR below 60 dB at 217 Hz. Values below 0.1 µF are not characterized and may cause instability or increased distortion.

Can TS4990 drive a 4 Ω speaker load?

Yes - the device supports loads ≥4 Ω. At V_CC = 5 V, it delivers 1.8 W into 4 Ω (THD = 1%, 1 kHz), but power dissipation rises significantly. Thermal derating is required above 25 °C ambient; with no heatsink, max continuous output drops to ~0.9 W at 70 °C ambient per Figure 33.

Is external gain-setting resistor network mandatory?

No - the amplifier is unity-gain stable and can operate open-loop (AV = 1) with direct feedback from VOUT1/VOUT2 to VIN−. However, external resistors (e.g., R_feed = 22 kΩ, R_in = 10 kΩ) are required to set precise gains (e.g., AV = 2.2) and optimize bandwidth and distortion performance per application schematics.

How does thermal shutdown behave during sustained overload?

When junction temperature reaches 150 °C, internal thermal shutdown disables both outputs and reduces ICC to <1 µA. The device remains latched off until T_j falls below ~135 °C (typical hysteresis), then automatically resumes normal operation - no external reset is needed.

DEMOTS4990Q Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Packaging:: Bulk

Product Status:: Obsolete

Amplifier Type:: Class AB

Output Type:: 1-Channel (Mono)

Max Output Power x Channels @ Load:: 1.2W x 1 @ 8Ohm

Voltage - Supply:: 2.2V ~ 5.5V

Utilized IC / Part:: TS4990

Contents:: Board(s)

DEMOTS4990Q FAQ

1.How can I place an order for DEMOTS4990Q through Aetrix?

Please submit a Request for Quotation (RFQ) for DEMOTS4990Q on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for DEMOTS4990Q reliable?

The price and inventory of DEMOTS4990Q are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DEMOTS4990Q is usually 5 days.

3.What payment methods are accepted for DEMOTS4990Q?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DEMOTS4990Q transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DEMOTS4990Q?

DEMOTS4990Q orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DEMOTS4990Q order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for DEMOTS4990Q?

For technical support, including DEMOTS4990Q datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DEMOTS4990Q requirements.

6.How does Aetrix verify that DEMOTS4990Q is sourced from the original manufacturer or authorized distributors?

All DEMOTS4990Q products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DEMOTS4990Q meets industry standards.

7.What is the process for return or replacement of DEMOTS4990Q?

All DEMOTS4990Q units undergo pre-shipment inspection (PSI). If there is an issue with DEMOTS4990Q, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The DEMOTS4990Q part is unused and in its original packaging.

Return procedure for DEMOTS4990Q:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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