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Diodes Incorporated AM4951RMMTR-G1
- Part No.:
- AM4951RMMTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Motor Drivers, Controllers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AM4951RMMTR-G1.pdf
- Description:
- IC MOTOR DRIVER 2.2V-24V 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,635
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Product details
Overview
AM4951RMMTR-G1 from BCD Semiconductor Manufacturing Limited is a single-phase BTL full-wave linear fan motor driver IC in MSOP-8 package, designed for 12V DC cooling fans. It delivers 200mA output with total saturation voltage of 1.2V (typ), features built-in RD output for rotation detection, lock shutdown with automatic restart, and operates across 2.2V–24V supply range. Used in CPU cooling systems and notebook thermal management.
For engineers reviewing the AM4951RMMTR-G1 datasheet, AM4951RMMTR-G1 pinout, AM4951RMMTR-G1 application, or AM4951RMMTR-G1 equivalent, key selection criteria include RD output functionality, BTL linear drive architecture, thermal protection behavior, lock-detection timing, and compatibility with Hall-effect sensor interfaces in low-noise fan control designs.
Technical Context
The AM4951RMMTR-G1 implements a bipolar-process BTL output stage with separate high-side and low-side saturation control, enabling precise current steering for unidirectional fan rotation. Its internal CT pin regulates switching timing via external RC network, while the RD output provides open-drain pulse feedback synchronized to motor rotation.
Lock protection activates when rotational stall is detected via Hall sensor input monitoring; the IC disables both output transistors and initiates automatic restart after removal of stall condition. Thermal shutdown engages at junction temperature exceeding safe operating limits, with θJA = 205°C/W in MSOP-8 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2V to 24V - supports wide-input operation from USB-powered to industrial 24V fan rails |
| Total Output Saturation Voltage | 1.2V typ @ 200mA - minimizes power loss and heat generation in linear drive mode |
| RD Output Type | Open-drain, 5mA sink capability - enables direct interface with microcontroller GPIO for tachometer signal decoding |
| Thermal Resistance θJA | 205°C/W (MSOP-8) - defines maximum power dissipation limit (585mW) under still-air conditions |
| Operating Temperature | -40°C to +105°C - qualified for use in laptop chassis and enclosed power supply environments |
| Lock Protection Response | Automatic shutdown + restart - eliminates need for external watchdog circuitry in fan control loops |
Pinout & Package
AM4951RMMTR-G1 is housed in an MSOP-8 package (3.0mm × 3.0mm, 0.65mm pitch), optimized for compact thermal management in space-constrained fan modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Positive supply input | Accepts 2.2–24V; powers internal regulator and output stage |
| GND | Ground reference | Common return path for supply, outputs, and logic circuits |
| OUT1 / OUT2 | BTL output terminals | Drive fan coil differentially; deliver up to 200mA continuous current |
| IN+ / IN- | Hall sensor differential inputs | Detect rotor position; enable commutation timing and lock detection |
| RD | Rotation detection output | Open-drain pulse output synchronized to fan rotation (1 pulse/rev) |
| CT | Timing capacitor connection | Sets internal oscillator frequency for BTL drive timing via external RC |
Key Features
| Feature | Design Value |
|---|---|
| BTL linear drive architecture | Enables silent, jitter-free fan operation without PWM-induced acoustic noise |
| Integrated RD output | Eliminates need for external tachometer conditioning circuitry in closed-loop speed control |
| Lock shutdown + auto-restart | Prevents thermal runaway during fan stall and restores operation without host intervention |
| Thermal protection circuit | Shuts down output before junction exceeds safe limit, ensuring reliability in sealed enclosures |
Applications
| Notebook Fan Control | CPU Cooling System |
|---|---|
Use Scenario: Fan speed regulation in ultrabook thermal subsystems with strict acoustic noise limits. IC Role / Device Role / Timing Role: BTL linear driver providing analog-controlled torque to 12V brushless DC fan via Hall sensor feedback. Use Value: Delivers silent operation (<25 dBA) and rapid response to thermal load changes without PWM artifacts. | Use Scenario: Active cooling for desktop CPU heatsinks requiring reliable stall recovery under dust-clogged conditions. IC Role / Device Role / Timing Role: Motor controller executing commutation timing and detecting rotor lock via IN+/IN- differential sensing. Use Value: Automatic restart after dust-induced stall avoids system thermal throttling or shutdown. |
| Car Audio Amplifier Cooling | ATX Power Supply Fan Management |
Use Scenario: Forced-air cooling for Class-D amplifier modules in automotive infotainment head units. IC Role / Device Role / Timing Role: RD-output-enabled speed monitor feeding feedback to MCU-based thermal management firmware. Use Value: Enables closed-loop fan speed control over 12V automotive battery range (10.5–16V) with ±5% accuracy. | Use Scenario: Secondary fan control in multi-rail ATX PSUs where primary fan uses PWM and secondary requires analog quiet drive. IC Role / Device Role / Timing Role: Linear BTL driver interfacing with Hall sensor-equipped 24V auxiliary fan. Use Value: Reduces EMI vs. PWM-driven fans near sensitive analog power regulation circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-phase BTL fan motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM4951MMTR-G1 | FG output instead of RD; identical pinout and electrical specs except output signal type | Used where tachometer feedback is required as pulse-per-revolution (FG), not rotation detection flag (RD) | Select AM4951MMTR-G1 when host MCU expects FG-compatible timing signal rather than RD-level indication |
| AM4951RMPTR-G1 | PSOP-8 package (θJA = 110°C/W); rated for 24V operation only; same RD function and lock protection | Required for higher-power 24V fan designs needing greater thermal margin and higher voltage tolerance | Choose AM4951RMPTR-G1 when ambient temperature exceeds 70°C or fan load demands >300mA peak current |
Compared with AM4951MMTR-G1, AM4951RMMTR-G1 provides RD output for stall-aware speed monitoring; compared with AM4951RMPTR-G1, it trades thermal performance for smaller footprint in 12V space-constrained applications.
Availability
AM4951RMMTR-G1 is available at Aetrix Electronics and suitable for notebook fan control, CPU cooling systems, car audio amplifier cooling, and ATX power supply fan management requiring stable component supply and RoHS-compliant green packaging.
Supply support for AM4951RMMTR-G1 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
BCD Semiconductor Manufacturing Limited is a Shanghai-based analog and mixed-signal IC designer specializing in power management, motor control, and interface solutions for consumer and industrial markets.
The AM4951/R/2 product line targets cost-sensitive, low-noise DC fan applications in computing and audio systems, emphasizing integration of protection, feedback, and thermal resilience in compact packages.
FAQ
What is the purpose of the CT pin on AM4951RMMTR-G1?
The CT pin connects to an external RC network that sets the internal oscillator frequency governing BTL output timing and commutation intervals. Typical values use 100kΩ resistor and 100pF capacitor to achieve ~30kHz switching, balancing efficiency and audible noise suppression in fan drive applications.
Can AM4951RMMTR-G1 drive a 24V fan?
No - AM4951RMMTR-G1 is specified for 12V applications only and packaged in MSOP-8. Driving 24V fans requires AM4951RMPTR-G1 in PSOP-8 package, which has higher thermal capacity (θJA = 110°C/W) and is explicitly rated for 24V operation per datasheet ordering table.
How does the lock protection function respond to stalled motor conditions?
When Hall sensor inputs indicate no rotor movement for >1.2 seconds (determined by internal timer), the IC disables both OUT1 and OUT2 outputs, halting current flow. Upon detection of valid Hall transitions, it automatically re-enables drive without requiring external reset or power cycle.
Is an external pull-up resistor required for the RD output?
Yes - RD is an open-drain output and requires an external pull-up resistor (typically 4.7kΩ to VCC) to generate a valid logic-high level. The datasheet specifies 5mA sink capability, allowing compatibility with standard 3.3V or 5V microcontroller inputs when properly terminated.
AM4951RMMTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- Brushed DC
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (2)
- Interface:
- Parallel
- Technology:
- Bipolar
- Step Resolution:
- -
- Applications:
- Fan Motor Driver
- Current - Output:
- -
- Voltage - Supply:
- 2.2V ~ 24V
- Voltage - Load:
- 2.2V ~ 24V
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AM4951RMMTR-G1 FAQ
1.How can I place an order for AM4951RMMTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AM4951RMMTR-G1 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 AM4951RMMTR-G1 reliable?
The price and inventory of AM4951RMMTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AM4951RMMTR-G1 is usually 5 days.
3.What payment methods are accepted for AM4951RMMTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AM4951RMMTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AM4951RMMTR-G1?
AM4951RMMTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AM4951RMMTR-G1 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 AM4951RMMTR-G1?
For technical support, including AM4951RMMTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AM4951RMMTR-G1 requirements.
6.How does Aetrix verify that AM4951RMMTR-G1 is sourced from the original manufacturer or authorized distributors?
All AM4951RMMTR-G1 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 AM4951RMMTR-G1 meets industry standards.
7.What is the process for return or replacement of AM4951RMMTR-G1?
All AM4951RMMTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AM4951RMMTR-G1, 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 AM4951RMMTR-G1 part is unused and in its original packaging.
Return procedure for AM4951RMMTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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