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Infineon Technologies TDA21801
- Part No.:
- TDA21801
- Manufacturer:
- Infineon Technologies
- Category:
- Motor Drivers, Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TDA21801.pdf
- Description:
- IC MOTOR DRIVER 10.8V-13.2V 8DSO
- Quantity:
- Payment:
- Shipping:
Inventory:1,860
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Product details
Overview
TDA21801 from Infineon Technologies is a low-cost, fully integrated fan speed controller IC for standard two-wire DC fans, featuring internal pulse detection for RPM sensing via RSin current shunt input, NTC-based temperature feedback (2.2 kΩ thermistor), and programmable minimum speed (1329 rpm typical) with VCO frequency control via RC-VCO pin. It delivers tacho output (FanM, two pulses per revolution), overtemperature protection (OTP) with early warning and shutdown capability, and external analog speed control via FCin.
For engineers reviewing the TDA21801 datasheet, TDA21801 pinout, TDA21801 application, or TDA21801 equivalent, key selection considerations include its 8-pin PG-DSO-8 package, 5–12 V supply range, 330 mV RSin linear input limit, 4-pole fan compatibility (15/16 × n × P formula), and OTP response timing derived from NTC voltage thresholds.
Technical Context
The TDA21801 implements a closed-loop speed control architecture where motor commutation pulses are detected from the RSin shunt voltage waveform, digitally integrated to generate a speed value, then compared against temperature-derived setpoints from the NTC input. The internal VCO adjusts fan drive frequency to maintain target RPM, with FanM providing synchronized tacho feedback.
OTP functionality operates in two stages: early warning triggered when NTC voltage drops below 1.25 V (indicating rising temperature), and full shutdown when it falls below 0.75 V. The TRSOUT output drives an external PNP transistor to modulate fan voltage, while FCin accepts 0–2.5 V analog control for manual speed override independent of temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5 V to 12 V - supports common PC SMPS rail voltages without LDO requirement |
| RSin Input Limit | ≤330 mV - defines max shunt resistor value (e.g., 0.5–1 Ω for 50–400 mA fan current) |
| FanM Output | Two pulses per revolution - enables direct RPM calculation (e.g., 2658 PPR = 1329 rpm) |
| NTC Input Thresholds | 1.25 V (OTP warning), 0.75 V (OTP shutdown) - sets thermal trip points for 2.2 kΩ NTC at defined bias |
| VCO Frequency Range | 15/16 × n × P - links output frequency directly to fan speed (n rpm) and pole count (P = 4 typical) |
| FCin Control Range | 0–2.5 V - provides linear analog override of temperature-based speed setpoint |
| Operating Ambient Temp | −25 °C to +85 °C - validated for desktop power supply environments |
Pinout & Package
Package: PG-DSO-8 (plastic dual small-outline, 8-pin, 150 mil width, exposed pad not specified).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FCin | Analog speed control input | Accepts 0–2.5 V external voltage to override temperature-based speed setpoint |
| 2 RSin | Fan current sense input | Receives voltage across shunt resistor (max 330 mV); enables commutation pulse detection |
| 3 TRSOUT | PNP transistor driver output | Open-collector output driving external PNP base; controls fan voltage modulation |
| 4 GND | Power and signal reference | Common ground for all analog and digital circuitry; requires low-impedance PCB connection |
| 5 RC-VCO | VCO frequency tuning node | Connects RC network (e.g., 220 kΩ + 3.3 nF) to set minimum fan speed and OTP shutdown timing |
| 6 FanM | Tachometer output | Digital square wave: two pulses per fan revolution; used for RPM monitoring and OTP warning |
| 7 NTC | Thermistor divider input | Reads voltage from NTC–RBIAS divider (e.g., 2.2 kΩ NTC + 3.6 kΩ pull-up) for temperature sensing |
| 8 VDD | Positive supply input | 5–12 V DC supply; powers internal analog/digital blocks and bias circuits |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Internal digital integrator and speed loop logic eliminate need for external op-amp or capacitor networks |
| Integrated OTP dual-stage protection | Separate voltage thresholds (1.25 V / 0.75 V on NTC pin) enable configurable early warning and hard shutdown |
| Direct two-wire fan compatibility | Supports standard brushed DC fans without requiring Hall sensors or three-wire interfaces |
| Adjustable minimum speed | VCO frequency set via RC-VCO allows precise tuning of lowest operational RPM (e.g., 1329 rpm typical) |
| Shunt-based current sensing | RSin input with 330 mV full-scale enables accurate RPM detection using low-value, low-power shunt resistors |
Applications
| PC Desktop Silver Box PSU | Industrial Power Supply Cooling |
|---|---|
Use Scenario: Regulating airflow in ATX-compliant 80 PLUS certified power supplies under variable load conditions. IC Role / Device Role / Timing Role: Fan speed controller managing thermal dissipation via NTC-coupled heat sink monitoring and FCin-based system-level load coordination. Use Value: Maintains acoustic noise below 25 dBA at idle while ensuring ≥4540 rpm peak cooling during 100% load, using only one IC and four passive components. | Use Scenario: Active cooling control in DIN-rail mounted 24 V industrial PSUs operating in −25 °C to +70 °C ambient. IC Role / Device Role / Timing Role: Temperature-responsive fan actuator interfacing with external NTC on MOSFET heatsink and overriding speed via PLC analog output on FCin. Use Value: Enables deterministic OTP shutdown within 200 ms of exceeding 95 °C heatsink temp, preventing thermal runaway without microcontroller intervention. |
| Embedded System Thermal Management | Medical Power Module Cooling |
Use Scenario: Fan regulation in fan-cooled medical imaging subsystems where EMI and reliability are critical. IC Role / Device Role / Timing Role: Standalone analog thermal controller generating FanM tacho for host MCU RPM verification and TRSOUT-driven PNP switching. Use Value: Eliminates need for isolated tacho optocouplers and discrete comparator circuits, reducing BOM count by 7 parts versus discrete solution. | Use Scenario: Redundant cooling control in Class II medical AC/DC modules requiring fail-safe thermal response. IC Role / Device Role / Timing Role: Dual-stage OTP monitor feeding FanM warning pulses to system watchdog and asserting hard shutdown via TRSOUT if NTC voltage collapses. Use Value: Meets IEC 60601-1 clause 11.3.2 for thermal protection independence-no software dependency, no single-point failure path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fan speed control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6650 | 4-wire fan interface with SMBus support; requires external tachometer pull-up; no integrated OTP shutdown | Designed for server board management controllers (BMC), not standalone two-wire fan control | Choose MAX6650 only when SMBus telemetry and multi-fan coordination are required |
| ADM1032 | Temperature sensor + fan controller combo; uses external PWM generator; no RSin current sensing or VCO-based speed loop | Relies on host MCU to generate PWM; lacks autonomous commutation-based RPM detection | Choose ADM1032 when integrating temperature sensing and fan control into existing microcontroller-based thermal management |
Compared with MAX6650 and ADM1032, the TDA21801 uniquely integrates shunt-based RPM detection, analog NTC processing, and dual-stage OTP in a single 8-pin IC-enabling fully autonomous two-wire fan control without MCU, SMBus, or external PWM generation.
Availability
TDA21801 is available at Aetrix Electronics and suitable for PC desktop power supplies, industrial DIN-rail PSUs, embedded thermal management systems, and medical AC/DC modules requiring stable component supply and long-lifecycle availability.
Supply support for TDA21801 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 ISO/TS 16949-certified manufacturing.
The FanControl product line-including TDA21801-is designed specifically for cost-sensitive, high-volume thermal management in AC/DC power supplies and embedded systems, emphasizing analog-digital integration and minimal external component count.
FAQ
What is the maximum fan current supported by the TDA21801's RSin input?
The RSin input is specified for linear operation up to 330 mV. For fan currents between 50 mA and 400 mA, a shunt resistor of 0.5 Ω to 1 Ω is recommended-ensuring the voltage stays within this limit. Exceeding 330 mV risks inaccurate pulse detection and potential saturation of the internal amplifier stage.
How does the TDA21801 generate the FanM tachometer signal?
FanM outputs two digital pulses per fan revolution. This is achieved by detecting commutation events in the fan motor current waveform via the RSin shunt, generating internal trigger pulses, and routing every second pulse to the FanM pin. The signal is CMOS-compatible and requires no external pull-up for basic monitoring.
Can the TDA21801 drive a fan directly, or does it require an external transistor?
The TDA21801 cannot drive a fan directly. Its TRSOUT pin is an open-collector output designed to drive the base of an external PNP transistor (e.g., BC807), which in turn switches the fan's positive supply rail. This architecture isolates the IC from fan supply transients and enables higher current handling.
What NTC thermistor value is recommended for use with the TDA21801's NTC pin?
A 2.2 kΩ NTC thermistor (5% tolerance) is explicitly recommended in the datasheet, used in series with a 3.6 kΩ pull-up resistor (RBIAS) to VDD. This configuration yields the 1.25 V and 0.75 V OTP thresholds at defined temperatures, matching the internal comparator reference voltages.
TDA21801 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
TDA21801 FAQ
1.How can I place an order for TDA21801 through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA21801 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 TDA21801 reliable?
The price and inventory of TDA21801 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA21801 is usually 5 days.
3.What payment methods are accepted for TDA21801?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA21801 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA21801?
TDA21801 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA21801 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 TDA21801?
For technical support, including TDA21801 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA21801 requirements.
6.How does Aetrix verify that TDA21801 is sourced from the original manufacturer or authorized distributors?
All TDA21801 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 TDA21801 meets industry standards.
7.What is the process for return or replacement of TDA21801?
All TDA21801 units undergo pre-shipment inspection (PSI). If there is an issue with TDA21801, 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 TDA21801 part is unused and in its original packaging.
Return procedure for TDA21801:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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