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Home > Products > Integrated Circuits (ICs) > Linear > Audio Amplifiers

STMicroelectronics TS4909IQT

Name: TS4909IQT
Brand: STMicroelectronics
SKU: TS4909IQT
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TS4909IQT

Manufacturer:: STMicroelectronics

Category:: Audio Amplifiers

Package:: 10-VFDFN Exposed Pad

Datasheet:: TS4909IQT.pdf

Description:: IC AMP CLASS AB STER 158MW 10DFN

Quantity:: RFQ Add To RFQ list

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Inventory:4,833

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Product details

Overview

TS4909IQT from STMicroelectronics is a dual-mode stereo headphone amplifier IC designed for portable audio systems, delivering 158 mW into 16 Ω at 5 V (1% THD+N), operating from 2.2–5.5 V supply, featuring capacitor-less phantom ground and single-ended output topologies, and consuming only 2.0 mA typical quiescent current at 3 V.

For engineers reviewing the TS4909IQT datasheet, TS4909IQT pinout, TS4909IQT application, or TS4909IQT equivalent, key selection considerations include ultra-low standby current (10 nA typ.), pop-and-click suppression, crosstalk immunity (>110 dB in SE mode), and DFN10 3×3 mm package compatibility with space-constrained mobile PCB layouts.

Technical Context

The TS4909 integrates two independent Class-AB amplifier channels with configurable output topology: phantom ground (PG) mode eliminates DC-blocking capacitors by generating an internal VCC/2 reference, while single-ended (SE) mode disables PG to reduce power consumption. Gain is set externally via resistive feedback networks (Av = –R_feed/R_in), and the device is unity-gain stable.

It features active-low standby control, bypass-capacitor-dependent wake-up timing (50 ms PG / 100 ms SE), and high PSRR (72 dB at 1 kHz in PG mode). Input biasing uses a dedicated BIAS pin to stabilize common-mode voltage in PG configuration, and output swing is rail-to-rail limited by load and supply conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Power	158 mW @ 5 V, 16 Ω, 1% THD+N - sufficient for loud headphone playback without external boost stages
Supply Voltage Range	2.2 V to 5.5 V - supports single-cell Li-ion (3.0–4.2 V) and dual-cell alkaline (3.0 V) battery operation
Quiescent Current	2.0 mA typ. @ 3 V - enables >100-hour playback on typical 300 mAh portable battery
Standby Current	10 nA typ. - reduces system leakage to negligible levels during sleep states
SNR	105 dB typ. @ 5 V, A-weighted - ensures high-fidelity audio with minimal background noise floor
Crosstalk	110 dB @ 1 kHz, SE mode - prevents audible channel bleed in stereo headphone listening
PSRR	72 dB @ 1 kHz, PG mode - rejects ripple from noisy shared power rails in compact handheld designs

Pinout & Package

TS4909IQT is housed in a lead-free DFN10 (3 mm × 3 mm, 0.5 mm pitch) package with exposed thermal pad for enhanced power dissipation in portable form factors.

Pin/Terminal	Circuit Role	Design Meaning
Vin1, Vin2	Differential input terminals	Inverting inputs accepting AC-coupled audio signals; require external Rin/Rfeed network for gain setting
Vout1, Vout2, Vout3	Output terminals	Vout1/Vout2 drive left/right headphones in SE mode; Vout3 provides phantom ground reference in PG mode
Stdby	Active-low enable control	Pulled low to activate amplifier; high or floating places device in 10 nA standby state
SE/PHG	Topology selection input	High = SE mode (Vout3 disabled); Low = PG mode (Vout3 = VCC/2, enabling capacitor-less coupling)
Bypass	Half-supply decoupling node	Connects to 1 µF capacitor to stabilize internal VCC/2 reference in PG mode
Vdd	Positive supply rail	Accepts 2.2–5.5 V; powers both amplifier core and internal bias circuitry
Gnd	Ground reference	System ground return path for all analog and digital functions

Key Features

Feature	Design Value
Capacitor-less output	Phantom ground topology eliminates 2× 220 µF output coupling capacitors, saving >25 mm² PCB area
Pop-and-click suppression	Integrated soft-start and bias sequencing prevent audible transients during power-up/down transitions
Dual output modes	Selectable SE (lower IQ) or PG (capacitor-less) operation via single logic pin-no BOM change required
Rail-to-rail compatible	Operates down to 2.2 V supply, supporting modern low-voltage battery discharge profiles
Thermal robustness	R_thJA = 41 °C/W on 4-layer PCB enables 150 mW output without heatsink in thin mobile enclosures

Applications

Smartphone Audio Subsystem

Wireless Headphone Dongle

Use Scenario: Driving stereo headphones directly from baseband processor audio DAC outputs in slim smartphone chassis.

IC Role / Device Role / Timing Role: Final-stage headphone driver with integrated VCC/2 generation, replacing discrete op-amp + charge pump solution.

Use Value: Eliminates 4× large electrolytic capacitors, reducing BOM cost by $0.18 and freeing 30 mm² layout area.

Use Scenario: Compact USB-C or Bluetooth audio adapter requiring low-noise, low-power stereo amplification.

IC Role / Device Role / Timing Role: Dual-channel line driver with fast wake-up (50 ms) to meet Bluetooth LE audio latency requirements.

Use Value: 10 nA standby current extends dongle battery life to >1 year in shelf storage without switch-off.

Portable Media Player

Tablet Audio Output

Use Scenario: High-fidelity audio playback from flash-based media player with 3.7 V Li-ion battery.

IC Role / Device Role / Timing Role: Low-THD+N (0.3%) stereo amplifier supporting 16–32 Ω headphone loads across full battery range.

Use Value: Maintains >100 dB SNR down to 2.6 V supply, ensuring consistent audio quality until battery depletion.

Use Scenario: Dual-speaker + headphone combo output in 7-inch Android tablet with shared power rail.

IC Role / Device Role / Timing Role: Headphone channel amplifier with 72 dB PSRR to reject noise from switching DC-DC converters.

Use Value: Prevents audible 217 Hz switching tone from appearing in headphone output during CPU load changes.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX97220AETE+T	Higher output power (215 mW @ 5 V), but requires external 1.8 V LDO for bias; no PG mode	Needs additional regulator and coupling caps; better for high-SPL earbuds, not space-constrained phones	Choose when >180 mW output is mandatory and board area allows extra components
TAS5707PAPR	Digital-input Class-D amplifier; 3.3 V I²S interface; 93% efficiency vs. TS4909's 65% Class-AB	Requires DSP-level integration; unsuitable for analog-line-in portable designs	Prefer for battery-powered devices with digital audio source and thermal constraints

Compared with MAX97220AETE+T and TAS5707PAPR, the TS4909IQT uniquely balances ultra-low standby current, capacitor-less operation, and analog-input simplicity-making it optimal for cost-sensitive, space-limited portable audio where analog DAC outputs and long shelf life are priorities.

Availability

TS4909IQT is available at Aetrix Electronics and suitable for smartphone audio subsystems, wireless headphone dongles, portable media players, and tablet audio outputs requiring stable component supply and long-term production continuity.

Supply support for TS4909IQT 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, power, microcontroller, and sensor solutions for automotive, industrial, and consumer markets.

The TS4909 belongs to ST's low-power audio amplifier product line, engineered specifically for battery-operated portable devices demanding high audio fidelity, minimal PCB footprint, and extended operational lifetime.

FAQ

What is the minimum recommended bypass capacitor value for stable phantom ground operation?

A 1 µF ceramic capacitor is specified between the Bypass pin and GND for stable VCC/2 generation in phantom ground mode. Using <1 µF risks increased output offset drift and reduced PSRR above 10 kHz; ST validates performance with X7R dielectric and ≤100 mΩ ESR.

Can TS4909IQT drive 32 Ω headphones effectively at 2.6 V supply?

Yes: it delivers 23 mW into 32 Ω at 2.6 V with 1% THD+N (1 kHz), sufficient for moderate-volume listening. SNR remains 100 dB (A-weighted), and crosstalk exceeds 110 dB-meeting EN 50332-1 loudness and separation requirements for portable audio.

How does the SE/PHG pin affect thermal performance?

In SE mode, Vout3 is disabled, reducing internal bias current and junction temperature by ~8°C at full 150 mW output (measured on 4-layer PCB). This extends safe continuous operation time before thermal shutdown, especially in sealed enclosures.

Is external gain-setting resistor matching critical for stereo balance?

Yes: mismatch >0.5% between left/right Rin or Rfeed resistors causes >0.1 dB channel gain error, audible as image shift. ST recommends 0.1% tolerance metal-film resistors placed symmetrically near the IC to minimize layout-induced thermal gradients.

TS4909IQT Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 10-VFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Class AB

Output Type:: Headphones, 2-Channel (Stereo)

Max Output Power x Channels @ Load:: 158mW x 2 @ 16Ohm

Voltage - Supply:: 2.2V ~ 5.5V

Features:: Depop, Standby

Mounting Type:: Surface Mount

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Supplier Device Package:: 10-DFN (3x3)

TS4909IQT FAQ

1.How can I place an order for TS4909IQT through Aetrix?

Please submit a Request for Quotation (RFQ) for TS4909IQT 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 TS4909IQT reliable?

The price and inventory of TS4909IQT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS4909IQT is usually 5 days.

3.What payment methods are accepted for TS4909IQT?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS4909IQT transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TS4909IQT?

TS4909IQT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TS4909IQT 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 TS4909IQT?

For technical support, including TS4909IQT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS4909IQT requirements.

6.How does Aetrix verify that TS4909IQT is sourced from the original manufacturer or authorized distributors?

All TS4909IQT 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 TS4909IQT meets industry standards.

7.What is the process for return or replacement of TS4909IQT?

All TS4909IQT units undergo pre-shipment inspection (PSI). If there is an issue with TS4909IQT, 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 TS4909IQT part is unused and in its original packaging.

Return procedure for TS4909IQT:

1.Submit a request within 90 days.

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

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