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Diodes Incorporated AM4951MMTR-G1
- Part No.:
- AM4951MMTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Motor Drivers, Controllers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AM4951MMTR-G1.pdf
- Description:
- IC MOTOR DRIVER 2.2V-24V 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,090
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Product details
Overview
AM4951MMTR-G1 from BCD Semiconductor Manufacturing Limited is a single-phase BTL-output linear fan motor driver IC designed for DC brushless fan control in 12V systems. It delivers 200mA output current with total saturation voltage of 1.2V (typ), integrates lock shutdown and automatic restart, and provides FG tachometer output. Used in CPU cooling systems and notebook thermal management where silent, reliable operation is required.
For engineers reviewing the AM4951MMTR-G1 datasheet, AM4951MMTR-G1 pinout, AM4951MMTR-G1 application, or AM4951MMTR-G1 equivalent, key selection criteria include its MSOP-8 package, 2.2–24V supply range, integrated FG output, thermal protection, and lock-detection behavior in fan stall conditions.
Technical Context
The AM4951MMTR-G1 implements a bipolar-process BTL linear drive architecture with internal charge/discharge control on the CT pin to regulate motor commutation timing. Its Hall-input interface accepts differential signals (IN+, IN−) with 7–15mV sensitivity and supports external Hall sensor biasing via VCC-derived networks.
It features dual-stage thermal protection and a dedicated FG open-collector output that pulses per motor rotation (not RD or HB-those are exclusive to AM4951R/AM4952 variants). The IC operates across −40°C to +105°C ambient and shuts down under locked-rotor condition, then auto-restarts when rotation resumes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2V to 24V - Enables direct compatibility with 3.3V, 5V, 12V, and 24V fan power rails without external regulators. |
| Output Current (Max) | 500mA peak - Supports driving larger axial fans up to ~3W at 12V with margin for startup torque. |
| Total Saturation Voltage | 1.2V typ @ 200mA - Minimizes conduction loss and self-heating in linear BTL mode, critical for low-noise thermal design. |
| FG Output Type | Open-drain, 10mA sink capability - Directly interfaces with standard microcontroller GPIOs for RPM monitoring without pull-up resistor redesign. |
| Thermal Shutdown Threshold | Internally set - Prevents permanent damage during sustained overload or poor heatsinking; recovery occurs automatically after cooldown. |
| Operating Temperature | −40°C to +105°C - Qualified for deployment in high-ambient environments like laptop chassis near CPU/GPU hotspots. |
| Package | MSOP-8 - Surface-mount, 3mm × 3mm footprint with 0.65mm pitch; optimized for compact PCB layouts in space-constrained cooling modules. |
Pinout & Package
AM4951MMTR-G1 is housed in an MSOP-8 package (3.0 × 3.0 × 0.95 mm, 0.65 mm pitch), rated for 12V applications only and RoHS-compliant (G1 suffix). Thermal resistance θJA = 205°C/W enables moderate-power fan drive with minimal copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | BTL High-Side Output | Drives one side of fan coil; complements OUT2 to generate bidirectional current flow for full-wave commutation. |
| 2 (GND) | Power Ground | Common return path for motor current and internal bias circuits; must be low-impedance to avoid noise coupling into Hall inputs. |
| 3 (OUT2) | BTL Low-Side Output | Completes BTL bridge; paired with OUT1 to deliver differential voltage swing across fan winding. |
| 4 (CT) | Timing Capacitor Node | Controls commutation frequency via external capacitor; charge/discharge current ratio (6–10×) sets timing accuracy. |
| 5 (IN−) | Hall Sensor Inverting Input | Accepts differential Hall signal; referenced to internal 0.5V common-mode level for noise immunity. |
| 6 (IN+) | Hall Sensor Non-Inverting Input | Paired with IN−; 7–15mV input sensitivity allows use with low-output Hall sensors (e.g., AH920). |
| 7 (VCC) | Supply Input | Accepts 2.2–24V; internal regulator powers logic and bias circuits; requires local 2.2µF+ decoupling per datasheet Note 2. |
| 8 (FG) | Tachometer Output | Open-drain pulse output synchronized to motor rotation (2 pulses/rev); sinks up to 10mA for direct MCU interfacing. |
Key Features
| Feature | Design Value |
|---|---|
| BTL Linear Drive Architecture | Eliminates external H-bridge MOSFETs and gate drivers; reduces BOM count and layout complexity in fan modules. |
| Lock Detection & Auto-Restart | Halts output current during rotor stall and resumes operation within milliseconds after mechanical obstruction clears - no host intervention needed. |
| Integrated FG Tachometer Output | Provides real-time RPM feedback without external comparators or conditioning circuitry; compatible with standard fan control ICs. |
| Thermal Protection Circuit | Monitors junction temperature continuously and disables outputs before reaching destructive thresholds - ensures long-term reliability in sealed enclosures. |
| Low-Voltage Operation Support | Starts and runs fans reliably down to 2.2V supply, enabling compatibility with battery-backed or low-dropout regulator domains. |
Applications
| CPU Cooling Systems | Notebook Fan Control |
|---|---|
|
Use Scenario: Active thermal regulation of high-performance CPUs in laptops and mini-PCs where acoustic noise must remain below 28 dBA. IC Role / Device Role / Timing Role: Single-phase BTL motor driver providing closed-loop speed control via FG feedback and Hall-based commutation timing. Use Value: Silent operation enabled by linear drive (no PWM switching noise) and automatic stall recovery prevents system thermal shutdown during dust-clogged operation. |
Use Scenario: Compact, low-profile cooling solution for ultrabooks with height constraints ≤ 1.2mm and strict EMI limits. IC Role / Device Role / Timing Role: Integrated fan driver with MSOP-8 footprint and built-in FG output eliminates need for discrete transistors and tach signal conditioning. Use Value: Reduces board area by >40% vs. discrete H-bridge + comparator solutions while maintaining ±5% RPM accuracy across temperature. |
| Car Audio Amplifier Cooling | Industrial Power Supply Fans |
|
Use Scenario: Forced-air cooling of Class-D audio amplifier heatsinks in automotive infotainment head units exposed to 105°C under-hood ambient. IC Role / Device Role / Timing Role: 12V-rated fan driver with thermal shutdown and wide-input operation ensuring continuous airflow even during cold-cranking voltage dips. Use Value: Maintains fan operation down to 2.2V supply and survives transient overvoltage spikes up to 28V without latch-up. |
Use Scenario: Redundant cooling in telecom power supplies requiring >10-year field life and zero-failure fan control under continuous 24/7 load. IC Role / Device Role / Timing Role: Lock-protected linear driver with auto-restart prevents fan seizure-induced overheating in sealed AC/DC converter enclosures. Use Value: Eliminates need for external watchdog timers or host MCU polling; improves MTBF by removing single-point failure modes in fan control loop. |
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 |
|---|---|---|---|
| AM4951RMMTR-G1 | Same pinout and package, but outputs RD (rotation detection) instead of FG; lacks tachometer pulse count capability. | Suitable for simple "fan running/not running" status monitoring only - not for precise RPM control loops. | Select when binary rotation confirmation suffices and FG pulse decoding hardware is unavailable or unnecessary. |
| ALLEGRO A3981KLPTR-T | Stepper-based driver with microstepping; higher integration (current sense, PWM control); requires external FETs. | Targets precision positioning fans (e.g., optical drives); not drop-in compatible due to different control interface and pinout. | Choose only if variable-speed smoothness and sub-step resolution outweigh BOM simplicity and cost sensitivity. |
Compared with AM4951RMMTR-G1, the AM4951MMTR-G1 provides quantitative RPM data via FG pulses, enabling closed-loop thermal control; versus A3981KLPTR-T, it offers lower system cost and smaller footprint but lacks programmable current limiting and microstepping.
Availability
AM4951MMTR-G1 is available at Aetrix Electronics and suitable for CPU cooling systems, notebook thermal management, car audio amplifier cooling, and industrial power supply fans requiring stable component supply, long-lifecycle support, and RoHS-compliant green packaging.
Supply support for AM4951MMTR-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 IC designer specializing in power management, motor control, and mixed-signal solutions for consumer, computing, and industrial markets.
The AM4951 series belongs to BCD's fan motor driver product line, engineered specifically for silent, reliable, and compact DC brushless fan control in thermally constrained electronic systems.
FAQ
What is the maximum continuous output current rating for AM4951MMTR-G1?
The AM4951MMTR-G1 is rated for 200mA continuous output current (typical operating point), with 500mA peak current capability per Absolute Maximum Ratings. Sustained 200mA operation requires adequate PCB copper area and ambient temperature ≤ 60°C to maintain junction temperature below 125°C, given its θJA of 205°C/W in MSOP-8.
Does AM4951MMTR-G1 support 5V-only fan applications?
Yes - the AM4951MMTR-G1 operates from 2.2V to 24V, making it fully compatible with 5V fan rails. Its low saturation voltage (1.2V total) ensures ≥3.8V effective drive voltage across the fan coil at 5V supply, sufficient for most 5V brushless fans rated up to 1.5W.
Can the FG output be used directly with a 3.3V microcontroller GPIO?
Yes - the FG pin is an open-drain output with 10mA sink capability and 0.3V max low-level voltage at 5mA. A 10kΩ pull-up to 3.3V yields valid logic levels and meets standard MCU input thresholds without level-shifting circuitry.
Is an external capacitor required on the VCC pin?
Yes - per datasheet Note 2, a minimum 2.2µF ceramic capacitor must be placed close to the VCC pin to stabilize the internal regulator and provide regenerative current return path during BTL switching. Omission risks erratic commutation or thermal shutdown under load.
AM4951MMTR-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
AM4951MMTR-G1 FAQ
1.How can I place an order for AM4951MMTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AM4951MMTR-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 AM4951MMTR-G1 reliable?
The price and inventory of AM4951MMTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AM4951MMTR-G1 is usually 5 days.
3.What payment methods are accepted for AM4951MMTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AM4951MMTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AM4951MMTR-G1?
AM4951MMTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AM4951MMTR-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 AM4951MMTR-G1?
For technical support, including AM4951MMTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AM4951MMTR-G1 requirements.
6.How does Aetrix verify that AM4951MMTR-G1 is sourced from the original manufacturer or authorized distributors?
All AM4951MMTR-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 AM4951MMTR-G1 meets industry standards.
7.What is the process for return or replacement of AM4951MMTR-G1?
All AM4951MMTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AM4951MMTR-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 AM4951MMTR-G1 part is unused and in its original packaging.
Return procedure for AM4951MMTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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