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Infineon Technologies TDA21801XUMA1
- Part No.:
- TDA21801XUMA1
- Manufacturer:
- Infineon Technologies
- Category:
- Motor Drivers, Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TDA21801XUMA1.pdf
- Description:
- IC MOTOR DRIVER 10.8V-13.2V 8DSO
- Quantity:
- Payment:
- Shipping:
Inventory:1,938
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Product details
Overview
TDA21801XUMA1 from Infineon Technologies is a low-cost, fully integrated fan speed controller IC for standard two-wire DC fans, featuring internal pulse detection for tachometer generation, NTC-based temperature sensing, and programmable minimum speed control. It operates from 5 V to 12 V supply, supports fan currents up to 400 mA via external shunt, and delivers two-pulse-per-revolution FanM output for RPM monitoring in PC power supplies.
For engineers reviewing the TDA21801XUMA1 datasheet, TDA21801XUMA1 pinout, TDA21801XUMA1 application, or TDA21801XUMA1 equivalent, key selection criteria include its integrated speed loop (no external compensation required), OTP early-warning and shutdown capability, RC-VCO-adjusted minimum frequency, and compatibility with 4-pole desktop PC fans requiring 1329–4540 rpm thermal tracking.
Technical Context
The TDA21801 implements a current-sense-based commutation detection architecture: RSin monitors fan motor current through an external shunt (0.5–1 Ω), generating trigger pulses at each motor pole transition. The internal digital integrator and speed value generator convert pulse timing into RPM-proportional control signals.
Its analog front-end includes dedicated NTC input (7) with biasing resistor network, FCin (1) for external voltage-based speed override, and TRSOUT (3) driving an external PNP transistor to modulate fan voltage. The RC-VCO (5) sets minimum oscillation frequency and enables overtemperature protection shutdown via VCO frequency collapse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5 V to 12 V - supports direct connection to SMPS 5V/12V rails without LDO |
| Fan Current Sensing Range | 50 mA to 400 mA - linear operation up to 330 mV RSin input, enabling use with common 0.5–1 Ω shunts |
| FanM Output Format | Two pulses per revolution - provides direct RPM measurement compatible with standard fan monitoring logic |
| NTC Input Support | 2.2 kΩ NTC with 3.6 kΩ pull-up - enables thermal feedback for fan speed vs. temperature curves (e.g., 1329–4540 rpm) |
| Minimum Speed Control | Adjustable via RC-VCO - sets lowest VCO frequency corresponding to min fan speed (e.g., 1329 rpm for 4-pole fans) |
| Overtemperature Protection | Dual-level OTP - early warning via FanM pulse anomaly and full shutdown via VCO stall |
| Operating Ambient Temp | −40 °C to +125 °C - qualified for industrial-grade power supply environments |
Pinout & Package
Package: PG-DSO-8 (8-pin plastic dual small outline, exposed pad variant per Infineon outline drawing Q67042-S4257).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FCin | Analog speed control input | Accepts external 0–2.5 V voltage to override temperature-based speed setpoint |
| 2 RSin | Fan current sense input | Receives differential voltage across external shunt; max 330 mV for linear operation |
| 3 TRSOUT | PNP transistor drive output | Open-collector output sinking up to 20 mA to control external PNP base for fan voltage modulation |
| 4 GND | Power and signal reference | Common ground for all analog and digital circuitry; requires low-impedance PCB return path |
| 5 RC-VCO | VCO frequency and OTP setting | RC network sets minimum VCO frequency and triggers OTP shutdown when voltage drops below threshold |
| 6 FanM | Digital tachometer output | Active-low two-pulse-per-revolution signal; used for RPM readback and OTP early-warning detection |
| 7 NTC | Thermistor voltage divider input | Accepts voltage from NTC/resistor divider (e.g., 2.2 kΩ NTC + 3.6 kΩ RBIAS) for thermal feedback |
| 8 VDD | Positive supply input | 5–12 V main supply; internal regulator powers analog/digital blocks; decoupling capacitor required |
Key Features
| Feature | Design Value |
|---|---|
| No external speed loop compensation | Internal digital integrator eliminates need for external op-amp or RC networks in RPM control loop |
| Integrated pulse detection | Direct commutation sensing from fan motor current waveform enables robust tach generation without Hall sensors |
| Programmable minimum speed | RC-VCO pin allows precise setting of lowest operational frequency, preventing fan stall at low temperatures |
| Dual-level overtemperature protection | Early-warning (FanM pulse deviation) and hard shutdown (VCO stall) provide layered thermal safety for PSU systems |
| Two-wire fan compatibility | Designed specifically for cost-sensitive desktop PC silver-box SMPS using standard 2-wire fans without tach feedback |
Applications
| PC Desktop Silver-Box SMPS | Industrial Power Supply Cooling |
|---|---|
Use Scenario: Regulated 5 V/12 V output power supply for desktop PCs requiring silent, thermally adaptive cooling. IC Role / Device Role / Timing Role: Fan speed controller managing 2-wire DC fan via current-sense commutation detection and NTC thermal feedback. Use Value: Enables automatic fan ramp-up from 1329 rpm (idle) to 4540 rpm (full load), reducing acoustic noise while maintaining safe operating temperatures. | Use Scenario: Convection-limited enclosed industrial power module needing reliable thermal derating under ambient drift. IC Role / Device Role / Timing Role: Thermal management controller interfacing with 4-pole fan and heatsink-coupled NTC to prevent overheating during sustained overload. Use Value: Dual-level OTP (early warning + shutdown) prevents catastrophic failure by triggering system alerts before critical junction temperature is reached. |
| Embedded System Fan Management | Server PSU Redundancy Monitoring |
Use Scenario: Fan-cooled embedded computing platform with space-constrained layout and no room for tach wiring. IC Role / Device Role / Timing Role: Standalone speed controller extracting RPM data from fan motor current instead of dedicated tach line. Use Value: Eliminates need for third wire (tach) in 2-wire fan interface, simplifying mechanical design and connector count. | Use Scenario: Dual-fan server PSU where one fan failure must be detected and compensated before thermal runaway. IC Role / Device Role / Timing Role: Fan health monitor using FanM pulse integrity analysis to detect stalled or degraded fan operation. Use Value: FanM pulse anomaly detection provides early fault indication prior to complete loss of airflow, enabling graceful failover. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fan speed control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6650ASA+ | Requires external tach input; no integrated current-sense pulse detection; uses external op-amp for speed loop | Needs 3-wire fan; lacks NTC-based thermal curve programming; no built-in OTP shutdown | Select if existing design uses tach feedback and requires I²C configurability over analog thermal control |
| LM87CIMT | Multi-channel hardware monitor with fan control; supports both PWM and voltage-mode control; includes SMBus interface | Higher BOM cost; requires firmware integration; not optimized for low-cost 2-wire fan-only applications | Select when system-level thermal monitoring (voltage, temp, fan) and host communication are required alongside fan control |
Compared with MAX6650ASA+ and LM87CIMT, the TDA21801XUMA1 offers lower system cost and simpler implementation for dedicated 2-wire fan control in SMPS, trading configurability and multi-sensor support for minimal external components and integrated thermal shutdown.
Availability
TDA21801XUMA1 is available at Aetrix Electronics and suitable for PC desktop power supplies, industrial SMPS cooling systems, embedded fan management, and server PSU redundancy monitoring requiring stable component supply and long-term lifecycle support.
Supply support for TDA21801XUMA1 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
Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with global R&D centers and manufacturing facilities.
The FanControl product line, including TDA21801XUMA1, was designed specifically for cost-effective, high-reliability thermal management in AC/DC power supplies and embedded systems using standard two-wire DC fans.
FAQ
What is the maximum fan current supported by TDA21801XUMA1?
The TDA21801XUMA1 supports fan currents from 50 mA to 400 mA, determined by the external shunt resistor on RSin. With a typical 0.5–1 Ω shunt, the device maintains linear sensing up to 330 mV input, ensuring accurate commutation detection across this range without saturation or clipping.
How does the RC-VCO pin enable overtemperature protection?
The RC-VCO pin sets the VCO's minimum frequency and serves as the OTP trip point. As die temperature rises, internal thermal sensing reduces the RC-VCO voltage; when it falls below a threshold, the VCO stalls, halting fan drive and triggering system shutdown-providing hardware-level fail-safe protection independent of software.
Can TDA21801XUMA1 drive a fan directly without external transistors?
No. TDA21801XUMA1 does not integrate a power switch. TRSOUT is an open-collector output designed to drive the base of an external PNP transistor (e.g., BC857), which in turn controls the fan's supply voltage-enabling efficient, low-loss voltage-mode speed regulation without internal power dissipation.
Is the FanM output compatible with standard microcontroller GPIO inputs?
Yes. FanM is an active-low, two-pulse-per-revolution open-drain signal with 5 V tolerant structure. It can be directly connected to a microcontroller GPIO configured with internal pull-up, enabling straightforward RPM counting using edge-triggered interrupts without level-shifting or conditioning circuitry.
TDA21801XUMA1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- Brushed DC
- Function:
- Controller - Speed
- Output Configuration:
- Pre-Driver - Low Side
- Interface:
- Analog
- Technology:
- -
- Step Resolution:
- -
- Applications:
- Fan Controller
- Current - Output:
- -
- Voltage - Supply:
- 10.8V ~ 13.2V
- Voltage - Load:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PG-DSO-8
TDA21801XUMA1 FAQ
1.How can I place an order for TDA21801XUMA1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA21801XUMA1 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 TDA21801XUMA1 reliable?
The price and inventory of TDA21801XUMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA21801XUMA1 is usually 5 days.
3.What payment methods are accepted for TDA21801XUMA1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA21801XUMA1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA21801XUMA1?
TDA21801XUMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA21801XUMA1 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 TDA21801XUMA1?
For technical support, including TDA21801XUMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA21801XUMA1 requirements.
6.How does Aetrix verify that TDA21801XUMA1 is sourced from the original manufacturer or authorized distributors?
All TDA21801XUMA1 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 TDA21801XUMA1 meets industry standards.
7.What is the process for return or replacement of TDA21801XUMA1?
All TDA21801XUMA1 units undergo pre-shipment inspection (PSI). If there is an issue with TDA21801XUMA1, 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 TDA21801XUMA1 part is unused and in its original packaging.
Return procedure for TDA21801XUMA1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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