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STMicroelectronics TS4902ID
- Part No.:
- TS4902ID
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Amplifiers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TS4902ID.pdf
- Description:
- IC AMP CLASS AB MONO 700MW 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,946
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Product details
Overview
TS4902ID from STMicroelectronics is a mono bridge-tied load (BTL) audio power amplifier delivering 0.7W RMS into 8Ω at 5V supply, with 0.1% THD+N at 200mW, 77dB PSRR at 217Hz, ultra-low 10nA standby current, and unity-gain stability-designed for compact portable audio systems requiring high fidelity and low quiescent power.
For engineers reviewing the TS4902ID datasheet, TS4902ID pinout, TS4902ID application, or TS4902ID equivalent, key selection considerations include BTL output configuration, thermal shutdown protection, external gain-setting resistor network, standby control polarity (active-low), and SO8 package compatibility with space-constrained mobile audio PCB layouts.
Technical Context
The TS4902ID implements a dual-output BTL architecture where VOUT1 and VOUT2 drive opposite phases across the speaker load, enabling 4× higher output power versus single-ended operation at identical supply voltage. Its internal biasing supports rail-to-rail input common-mode range (GND to VCC–1.5V) and stable operation with capacitive loads up to 560pF.
Gain is externally programmable via resistive feedback (Rfeed/Rin), supporting closed-loop gains of 2× to 10×; phase margin remains ≥70° and gain margin ≥20dB across operating conditions, ensuring robust stability without compensation capacitors beyond standard bypassing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Power | 0.7W RMS @ 5V/8Ω, THD = 1% - sufficient for loudspeaker drive in handheld devices without heatsinking |
| THD + N | 0.15% @ 250mW/8Ω/20Hz–20kHz - preserves audio clarity in voice and music playback |
| PSRR | 77dB @ 217Hz - rejects GSM-like power supply ripple without additional filtering |
| Standby Current | 10nA max - enables multi-week battery life in always-on audio subsystems |
| Supply Range | 2.2V to 5.5V - compatible with Li-ion, Li-poly, and dual-cell alkaline power rails |
| Thermal Shutdown | Active at 150°C - prevents latch-up or permanent damage during sustained high-power operation |
| Gain Bandwidth | 2MHz - supports flat frequency response up to 125kHz with proper external compensation |
Pinout & Package
TS4902ID is housed in an 8-pin Small Outline (SO8) package with standard 1.27mm pitch, surface-mount footprint, and exposed pad for thermal enhancement (per manufacturer thermal resistance spec: 150°C/W junction-to-ambient).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (STBY) | Standby Control Input | Active-low enable: device enters ultra-low-power mode when pulled ≤0.5V; logic-high (>1.5V) enables normal operation |
| 2 (VIN+) | Non-inverting Input | Accepts AC-coupled audio signal; forms high-pass filter with external Cin; common-mode range extends to VCC–1.5V |
| 3 (VIN−) | Inverting Input | Connected to feedback network (Rfeed) to set closed-loop gain; referenced to virtual ground |
| 4 (VOUT1) | BTL Output 1 | Drives one terminal of speaker load; inverted phase relative to VOUT2; rated for ±0.9×VCC swing |
| 5 (GND) | Analog Ground | Primary return path for input bias, feedback, and output current; must be low-impedance plane |
| 6 (VCC) | Positive Supply | 2.2–5.5V DC input; requires 100µF bulk bypass (Cs) near pin to suppress high-frequency THD degradation |
| 7 (VOUT2) | BTL Output 2 | Drives opposite speaker terminal; non-inverted phase relative to VIN+; differential swing = 2× single-ended |
| 8 (BP) | Bias Voltage Bypass | Connects to 1µF capacitor (Cb) to stabilize internal bias node; critical for PSRR <1kHz and pop/click suppression |
Key Features
| Feature | Design Value |
|---|---|
| BTL Output Architecture | Delivers 4× more power than SE amplifiers at same VCC, eliminating output coupling capacitor and reducing system BOM cost |
| Ultra-Low Standby Consumption | 10nA shutdown current enables >1-year battery retention in always-listening voice interface modules |
| Pop & Click Suppression | Internally optimized startup sequencing; external Cb/Cin time constant ratio (τin ≪ τb) minimizes audible transients |
| Unity-Gain Stable Design | Operates reliably with gain ≥1 using only external Rin/Rfeed; no stability-compensation capacitors required |
| Integrated Thermal Protection | Automatic shutdown at 150°C junction temperature; auto-recovery after cooldown-no external thermal sensor needed |
Applications
| Mobile Handset Audio | Portable Media Player |
|---|---|
Use Scenario: Driving mono earpiece or loudspeaker in GSM/UMTS feature phones with 3.3V or 5V battery supply. IC Role / Device Role / Timing Role: BTL audio power stage providing full-duplex speaker output during calls and media playback. Use Value: 0.3W output at 3.3V meets EN 50332-1 loudness requirements while 10nA standby extends talk-time by >15% versus legacy Class-AB amps. |
Use Scenario: Amplifying line-level audio from DAC in flash-based MP3 players with Li-ion battery. IC Role / Device Role / Timing Role: Final-stage power driver interfacing between codec and 8Ω ceramic speaker. Use Value: 77dB PSRR eliminates need for separate LDO filtering, reducing bill-of-materials and PCB area by 20%. |
| PDA Voice Feedback | Bluetooth Headset Base |
Use Scenario: Generating audible alerts and voice prompts in industrial PDAs operating from 2.6–5.5V wide-input rails. IC Role / Device Role / Timing Role: Low-voltage audio amplifier activated on GPIO-triggered interrupt for status tones. Use Value: 2.2V minimum supply allows operation down to end-of-life battery voltage, avoiding premature mute during field use. |
Use Scenario: Speaker driver in Bluetooth headset docking station with shared 5V USB power rail. IC Role / Device Role / Timing Role: Standby-controlled audio output enabling zero-power idle state between call sessions. Use Value: Active-low STBY pin synchronizes with Bluetooth controller's sleep/wake signals, eliminating software polling overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar BTL audio amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9718ETA+ | Higher 1.1W output @ 5V/8Ω; fixed 6dB gain; no standby control; requires external bootstrap capacitor | Preferred for higher-volume speaker applications but lacks ultra-low-power sleep mode | Select when peak acoustic output >0.7W is mandatory and standby current is secondary |
| TAS5342AIDBTR | Digital-input Class-D; 2.5W output; I²S interface; integrated DSP; 1.2mA quiescent (not nA-scale) | Suitable for digitally controlled audio subsystems but incompatible with analog line-in architectures | Choose only if migrating to digital audio bus and accepting 120× higher standby current |
Compared with MAX9718ETA+ and TAS5342AIDBTR, TS4902ID uniquely balances sub-1µA standby, analog input flexibility, and SO8 thermal performance-making it optimal for cost-sensitive, battery-constrained analog audio endpoints where power efficiency outweighs raw output wattage.
Availability
TS4902ID is available at Aetrix Electronics and suitable for mobile handsets, portable media players, PDAs, and Bluetooth accessory designs requiring stable component supply, long-lifecycle support, and RoHS-compliant SO8 packaging.
Supply support for TS4902ID 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 TS4902 belongs to ST's low-voltage audio power amplifier product line, engineered specifically for space- and power-constrained portable electronics where high-fidelity audio must coexist with multi-week battery life.
FAQ
What is the recommended minimum bypass capacitor for VCC?
A 100µF electrolytic capacitor (Cs) is mandatory at the VCC pin per the datasheet to maintain specified THD+N performance above 7kHz. Smaller values increase high-frequency distortion and reduce PSRR effectiveness; larger values improve ripple rejection but add board area and cost without measurable benefit in typical portable designs.
Can TS4902ID drive a 4Ω speaker load?
Yes-TS4902ID supports 4Ω to 32Ω loads. At 5V supply, maximum continuous output power into 4Ω is 1.0W (THD = 1%), but power dissipation rises significantly; thermal derating curves (Figure 20) require ambient temperature ≤60°C for reliable 4Ω operation at full output.
How does the active-low STBY pin behave during power-up?
The STBY pin defaults to high-impedance; if left floating, the device powers up in normal mode. To ensure defined startup, STBY must be pulled high via Rstb (typically 100kΩ) to VCC. Pulling STBY low within 1µs after VCC stabilization activates standby mode before audio initialization begins.
Is external gain-setting resistor matching required for low THD?
No-TS4902ID's THD specification (0.15%) assumes standard 1% tolerance resistors. Precision matching is unnecessary because distortion is dominated by internal amplifier topology and bypass capacitor selection (Cb, Cs), not resistor ratio accuracy. Use standard metal-film 1% parts for cost-effective design.
TS4902ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Class AB
- Output Type:
- 1-Channel (Mono)
- Max Output Power x Channels @ Load:
- 700mW x 1 @ 8Ohm
- Voltage - Supply:
- 2.2V ~ 5.5V
- Features:
- Depop, Standby, Thermal Protection
- Mounting Type:
- Surface Mount
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SOIC
TS4902ID FAQ
1.How can I place an order for TS4902ID through Aetrix?
Please submit a Request for Quotation (RFQ) for TS4902ID 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 TS4902ID reliable?
The price and inventory of TS4902ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TS4902ID is usually 5 days.
3.What payment methods are accepted for TS4902ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TS4902ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TS4902ID?
TS4902ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TS4902ID 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 TS4902ID?
For technical support, including TS4902ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TS4902ID requirements.
6.How does Aetrix verify that TS4902ID is sourced from the original manufacturer or authorized distributors?
All TS4902ID 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 TS4902ID meets industry standards.
7.What is the process for return or replacement of TS4902ID?
All TS4902ID units undergo pre-shipment inspection (PSI). If there is an issue with TS4902ID, 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 TS4902ID part is unused and in its original packaging.
Return procedure for TS4902ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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