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Diodes Incorporated AM4952MMTR-G1
- Part No.:
- AM4952MMTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Motor Drivers, Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AM4952MMTR-G1.pdf
- Description:
- IC MOTOR DRIVER 2.2V-24V 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,952
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Product details
Overview
AM4952MMTR-G1 from BCD Semiconductor Manufacturing Limited is a single-phase BTL full-wave linear fan motor driver IC with integrated Hall sensor bias (1.5 V), FG and RD outputs, lock protection, automatic restart, and thermal shutdown. It operates from 2.2 V to 24 V supply, delivers ≤200 mA output current with 1.2 V total saturation voltage, and is housed in an MSOP-10 package for CPU cooling and low-noise PC fan applications.
For engineers reviewing the AM4952MMTR-G1 datasheet, AM4952MMTR-G1 pinout, AM4952MMTR-G1 application, or AM4952MMTR-G1 equivalent, key selection criteria include dual FG/RD tachometer outputs, built-in Hall bias for direct sensor interfacing, BTL drive gain control via external resistor (51 dB), and thermal protection for continuous-duty fan systems.
Technical Context
The AM4952 implements a bipolar-process BTL output stage with independent high-side and low-side saturation control (VSAT_H = 0.95–1.2 V, VSAT_L = 0.25–0.45 V at 200 mA), enabling precise current regulation in single-phase DC brushless fans. Its internal CT pin controls charge/discharge timing with ICHG/IDHG ratio of 6–10, setting commutation frequency.
It integrates a dedicated Hall bias generator (VHB = 1.35–1.65 V at 1 mA) for direct connection to Hall-effect sensors, plus dual open-drain FG (fan speed) and RD (rotation detection) outputs with ≤0.3 V low-level voltage at 5 mA sink current - supporting real-time motor status monitoring in compact thermal management systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2 V to 24 V - supports wide-input fan power rails including USB-powered (5 V), notebook (12 V), and industrial 24 V systems. |
| Total Output Saturation Voltage | 1.2 V (typical, IOUT = 200 mA) - minimizes conduction loss and self-heating during continuous fan operation. |
| Hall Bias Voltage | 1.5 V (typical, IHB = 1 mA) - provides stable excitation for common 3-wire Hall sensors without external bias circuitry. |
| FG/RD Output Low Voltage | ≤0.3 V at 5 mA sink - ensures reliable logic-level compatibility with 3.3 V/5 V microcontrollers for tach feedback. |
| Thermal Resistance θJA | 195 °C/W (MSOP-10) - defines junction-to-ambient temperature rise per watt; enables ~300 mW safe continuous dissipation at TA = 70 °C. |
| BTL Gain Control Range | 51 dB (Gain Resistor = 1 kΩ to 360 kΩ) - allows fine-tuning of motor torque and startup behavior via single external resistor. |
| Lock Protection Response | Automatic shutdown + restart on stall removal - eliminates manual reset requirement and prevents thermal runaway during fan blockage. |
Pinout & Package
AM4952MMTR-G1 is packaged in a 10-pin MSOP (Mini Small Outline Package) with 0.5 mm pitch, 3.1 mm × 3.1 mm body, and exposed thermal pad for enhanced heat dissipation in space-constrained fan modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | BTL Output High-Side Driver | Drives one terminal of fan coil; complements OUT2 to generate bidirectional current for commutation. |
| 2 (OUT2) | BTL Output Low-Side Driver | Completes BTL bridge path; paired with OUT1 to deliver full-wave drive without external H-bridge. |
| 3 (IN+) | Hall Sensor Positive Input | Accepts Hall sensor output signal; internal comparator detects zero-crossing for rotor position sensing. |
| 4 (IN−) | Hall Sensor Negative Input | Differential input referenced to HB; rejects common-mode noise in motor EMI environments. |
| 5 (HB) | Hall Bias Output | Provides regulated 1.5 V bias to Hall sensor VDD pin - eliminates need for external LDO or resistor divider. |
| 6 (VCC) | Power Supply Input | Accepts 2.2–24 V DC; includes internal regulator for analog/digital blocks and thermal protection circuitry. |
| 7 (GND) | Ground Reference | Common return for power, logic, and Hall inputs; must be low-impedance to minimize noise coupling. |
| 8 (CT) | Timing Capacitor Node | Controls commutation frequency via external capacitor; charge/discharge current ratio sets timing accuracy. |
| 9 (FG) | Fan Speed Pulse Output | Open-drain tachometer signal - pulses per revolution for RPM measurement by host controller. |
| 10 (RD) | Rotation Detection Output | Open-drain flag indicating valid rotation - asserted only when motor spins above threshold speed. |
Key Features
| Feature | Design Value |
|---|---|
| BTL Full-Wave Linear Drive | Eliminates external H-bridge components while delivering smooth torque and silent operation across 2.2–24 V supply range. |
| Integrated Hall Bias Generator | 1.5 V ±0.15 V output reduces bill-of-materials count and improves sensor interface stability vs. resistor-based biasing. |
| Dual FG + RD Outputs | Enables simultaneous RPM monitoring and stall detection - critical for fail-safe thermal management in CPU coolers. |
| Lock Shutdown + Auto-Restart | Prevents thermal damage during fan stall and resumes operation automatically when obstruction clears - no firmware intervention required. |
| Thermal Protection Circuit | Shuts down output when junction temperature exceeds safe limit - protects IC and fan under overload or poor airflow conditions. |
Applications
| Notebook Fan Control | CPU Cooler Module |
|---|---|
Use Scenario: Variable-speed cooling for thin-and-light notebooks with limited board area and strict acoustic requirements. IC Role / Device Role / Timing Role: Single-chip BTL driver with integrated Hall bias and dual tach outputs manages 3-wire brushless fan directly from EC or PMIC. Use Value: Reduces system component count by eliminating discrete bias LDO and separate FG/RD logic, while maintaining <25 dBA acoustic performance. | Use Scenario: High-reliability active cooling for desktop and workstation CPUs operating under sustained thermal load. IC Role / Device Role / Timing Role: Motor controller providing closed-loop RPM control, stall detection, and thermal fault signaling to motherboard BIOS. Use Value: Enables dynamic fan speed adjustment based on real-time die temperature, extending fan life and reducing power consumption by up to 30% vs. fixed-speed operation. |
| Car Audio Amplifier Cooling | Industrial Power Supply Fan |
Use Scenario: Forced-air cooling for Class-D audio amplifier heatsinks in automotive infotainment head units. IC Role / Device Role / Timing Role: Fan driver with wide 2.2–24 V input range interfaces directly to vehicle battery (12 V nominal) and handles cold-crank transients. Use Value: Maintains consistent airflow across −40 °C to +105 °C ambient, preventing thermal throttling during extended playback sessions. | Use Scenario: Redundant cooling for 1U server PSUs where fan failure must trigger immediate system alert. IC Role / Device Role / Timing Role: Dual-output motor controller feeding FG to PSU microcontroller and RD to system management controller for independent health verification. Use Value: RD output provides hardware-level rotation confirmation independent of FG pulse counting - critical for safety-critical power systems. |
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 | MSOP-8, FG-only output, no HB pin, 12 V max rating, no RD output | Limited to lower-voltage, single-tach applications without Hall bias or rotation detection | Select when cost-sensitive designs require only basic speed feedback and operate ≤12 V. |
| AM4952MPTR-G1 | PSOP-8 package, same functionality but higher θJC (36 °C/W) and 24 V rating only | Targeted at higher-power 24 V fans requiring greater thermal margin than MSOP-10 allows | Choose for 24 V industrial fans where PCB layout permits larger PSOP-8 footprint and higher power dissipation is needed. |
Compared with AM4951MMTR-G1, AM4952MMTR-G1 adds Hall bias and RD output for enhanced sensor integration and fault detection; versus AM4952MPTR-G1, it trades thermal performance for smaller size and broader voltage compatibility down to 2.2 V.
Availability
AM4952MMTR-G1 is available at Aetrix Electronics and suitable for notebook fan control, CPU cooler modules, car audio amplifier cooling, and industrial power supply fan applications requiring stable component supply, RoHS-compliant green packaging, and tape-and-reel delivery for automated assembly.
Supply support for AM4952MMTR-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, computing, and industrial markets.
The AM495x series belongs to BCD's fan motor driver product line, engineered specifically for silent, reliable, and integrated control of single-phase brushless DC fans in thermally constrained electronic systems.
FAQ
What is the maximum continuous output current supported by AM4952MMTR-G1?
The AM4952MMTR-G1 supports up to 200 mA continuous output current per channel, with peak capability of 500 mA (absolute maximum). At 200 mA, total saturation voltage is 1.2 V typical, limiting power dissipation to ~240 mW - well within the 585 mW rated PD for MSOP-10 at 25 °C ambient.
Can AM4952MMTR-G1 drive a fan without an external Hall sensor?
No - the AM4952MMTR-G1 requires an external 3-wire Hall-effect sensor for commutation timing. It provides bias (HB pin) and differential inputs (IN+/IN−) but contains no internal sensor or sensorless back-EMF detection circuitry. Operation without a Hall sensor will result in no motor rotation.
How does the CT pin affect fan speed control?
The CT pin sets commutation frequency via an external capacitor: higher capacitance lowers switching frequency and thus fan speed, while lower capacitance increases speed. The internal charge/discharge current ratio (6–10) ensures stable timing across voltage and temperature, enabling predictable RPM tuning without microcontroller intervention.
Is the FG and RD output electrically isolated from the motor power domain?
No - FG and RD are open-drain outputs referenced to the same GND as VCC and motor outputs. They share the IC's ground plane and are not galvanically isolated. For noise immunity in high-EMI environments, routing these signals away from motor traces and adding small RC filters (e.g., 10 kΩ + 100 pF) is recommended per application note guidelines.
AM4952MMTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-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:
- 10-MSOP
AM4952MMTR-G1 FAQ
1.How can I place an order for AM4952MMTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AM4952MMTR-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 AM4952MMTR-G1 reliable?
The price and inventory of AM4952MMTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AM4952MMTR-G1 is usually 5 days.
3.What payment methods are accepted for AM4952MMTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AM4952MMTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AM4952MMTR-G1?
AM4952MMTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AM4952MMTR-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 AM4952MMTR-G1?
For technical support, including AM4952MMTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AM4952MMTR-G1 requirements.
6.How does Aetrix verify that AM4952MMTR-G1 is sourced from the original manufacturer or authorized distributors?
All AM4952MMTR-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 AM4952MMTR-G1 meets industry standards.
7.What is the process for return or replacement of AM4952MMTR-G1?
All AM4952MMTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AM4952MMTR-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 AM4952MMTR-G1 part is unused and in its original packaging.
Return procedure for AM4952MMTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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