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Diodes Incorporated AM4951MPTR-G1
- Part No.:
- AM4951MPTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Motor Drivers, Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
AM4951MPTR-G1.pdf
- Description:
- IC MOTOR DRIVER 2.2V-24V 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,364
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Product details
Overview
AM4951MPTR-G1 from BCD Semiconductor Manufacturing Limited is a single-phase BTL full-wave linear fan motor driver in PSOP-8 package, designed for 24V DC cooling fans. It delivers 200mA output with total saturation voltage of 1.2V (typ), integrates lock shutdown and automatic restart, and provides FG tachometer output for speed monitoring in CPU cooling and notebook thermal management.
For engineers reviewing the AM4951MPTR-G1 datasheet, AM4951MPTR-G1 pinout, AM4951MPTR-G1 application, or AM4951MPTR-G1 equivalent, this page details its BTL drive architecture, thermal protection, FG signal timing, and compatibility with Hall-effect commutation in low-noise 24V fan systems.
Technical Context
The AM4951MPTR-G1 implements a bipolar-process BTL output stage with independent high-side and low-side saturation control (VSAT_H = 0.95–1.2V, VSAT_L = 0.25–0.45V at 200mA). Its internal CT pin regulates charge/discharge current ratio (RCT = 6–10) to stabilize commutation timing.
It features integrated FG output with 0.15–0.3V low-level voltage (IFG = 5mA), thermal shutdown, and lock-detection circuitry that disables output during stall and auto-restarts upon recovery-enabling reliable unattended operation in consumer electronics cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2V to 24V - supports wide-input 24V fan systems with margin against rail sag |
| Output Saturation (Total) | 1.2V typ at 200mA - minimizes power loss and heat generation in BTL drive path |
| FG Output Low Voltage | 0.15–0.3V at 5mA - ensures clean logic-low detection by host controller |
| Thermal Resistance θJA | 110°C/W (PSOP-8) - enables 960mW max power dissipation at TA = 105°C |
| Operating Temperature | −40°C to +105°C - qualified for industrial-grade CPU cooler and automotive audio environments |
| Lock Protection | Auto-shutdown + restart - eliminates manual reset requirement after fan stall |
| Hall Bias Support | Not integrated - requires external bias network (unlike AM4952's built-in 1.5V HB) |
Pinout & Package
AM4951MPTR-G1 uses PSOP-8 package (3.4mm × 3.2mm, 0.65mm pitch), optimized for 24V applications with enhanced thermal performance (θJC = 36°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | BTL Output High-Side | Drives one terminal of fan coil; sinks current during half-cycle |
| 2 (OUT2) | BTL Output Low-Side | Drives opposite fan coil terminal; sources current during complementary half-cycle |
| 3 (IN+) | Hall Sensor Positive Input | Accepts differential Hall sensor output; referenced to IN− for polarity detection |
| 4 (IN−) | Hall Sensor Negative Input | Common-mode reference for Hall input; sets zero-crossing threshold |
| 5 (GND) | Power Ground | Return path for output stage and internal regulation; must be low-impedance |
| 6 (VCC) | Supply Input | 24V-rated input (28V abs max); powers internal regulator and output transistors |
| 7 (CT) | Commutation Timing Control | External capacitor sets BTL switching frequency via charge/discharge current ratio |
| 8 (FG) | Tachometer Output | Open-collector FG pulse output synchronized to fan rotation (2 pulses/rev) |
Key Features
| Feature | Design Value |
|---|---|
| BTL Full-Wave Linear Drive | Enables bidirectional coil current without external H-bridge; gain set by external resistor (1k–360kΩ) |
| Integrated Lock Shutdown | Halts output current during rotor stall and auto-resumes when rotation resumes - no firmware intervention needed |
| FG Tachometer Output | Dedicated open-collector output with 0.15–0.3V low-level voltage for precise RPM feedback to system controller |
| Thermal Protection | Internal junction temperature sensing shuts down output before damage occurs; recovers automatically on cooldown |
| Low-Voltage Start Capability | Operates down to 2.2V supply - supports brown-out resilience and battery-backed fan operation |
Applications
| CPU Cooling Systems | Notebook Fan Control |
|---|---|
Use Scenario: Active thermal management of high-performance CPUs in desktop and workstation platforms. IC Role / Device Role / Timing Role: BTL motor driver providing commutated current to 24V brushless DC cooling fan; FG output feeds RPM data to BIOS or EC. Use Value: Silent operation and lock-protection prevent thermal runaway during dust clogging or bearing failure. | Use Scenario: Compact, low-noise cooling in space-constrained notebook chassis with variable-speed fan profiles. IC Role / Device Role / Timing Role: Single-chip fan driver with integrated timing (CT pin) and tach feedback (FG), eliminating discrete timing components. Use Value: Reduces BOM count and PCB area while maintaining precise speed control across 2.2–24V input range. |
| Car Audio Amplifier Cooling | Consumer Power Supply Fans |
Use Scenario: Forced-air cooling of Class D amplifier heatsinks in automotive infotainment head units. IC Role / Device Role / Timing Role: 24V-rated motor driver with −40°C to +105°C operation; FG signal enables closed-loop thermal throttling. Use Value: Reliable startup and stall recovery under automotive load dump and cold-crank conditions. | Use Scenario: Thermal management in AC-DC power supplies for gaming PCs and home theater systems. IC Role / Device Role / Timing Role: Direct-drive BTL interface to 24V blower fan; thermal shutdown prevents overheating during sustained high-load operation. Use Value: Eliminates need for external current-sense or watchdog circuitry due to integrated lock/auto-restart. |
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 |
|---|---|---|---|
| AM4951RMPTR-G1 | RD (rotor lock detection) output instead of FG; identical pinout and drive specs | Used where lock status reporting (not speed feedback) is prioritized over RPM monitoring | Select when system requires explicit stall flag rather than tachometer pulses |
| AM4952MMTR-G1 | MSOP-10 package with integrated 1.5V Hall bias (VHB); adds RD + FG dual outputs | Supports Hall sensors requiring regulated bias; suited for higher integration density and dual-feedback designs | Choose for new designs needing bias regulation and dual-status outputs in compact layout |
Compared with AM4951RMPTR-G1, this part provides FG-based speed control instead of RD-based fault signaling; versus AM4952MMTR-G1, it trades Hall bias integration and dual outputs for PSOP-8 thermal robustness in 24V-only systems.
Availability
AM4951MPTR-G1 is available at Aetrix Electronics and suitable for CPU cooling systems, notebook thermal management, and car audio amplifier cooling requiring stable component supply and RoHS-compliant green packaging.
Supply support for AM4951MPTR-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 drivers, and mixed-signal solutions for consumer, computing, and automotive markets.
The AM4951/R/2 product line targets cost-sensitive, high-reliability DC fan control with integrated protection - emphasizing silent operation, thermal resilience, and simplified Hall-commutated BLDC drive in compact packages.
FAQ
What is the maximum continuous output current rating for AM4951MPTR-G1?
The AM4951MPTR-G1 supports 200mA typical continuous output current with total saturation voltage of 1.2V. Absolute maximum peak output current is 500mA per Absolute Maximum Ratings, but sustained operation above 200mA requires derating based on ambient temperature and PCB copper area to maintain junction temperature below 125°C.
Can AM4951MPTR-G1 drive a 12V fan?
No - AM4951MPTR-G1 is specifically rated for 24V applications and packaged in PSOP-8, which BCD designates for 24V use only. For 12V fans, the MSOP-8 variants (e.g., AM4951MMTR-G1) must be used, as PSOP-8's internal layout and thermal design are optimized for higher-voltage operation.
How does the CT pin function in AM4951MPTR-G1?
The CT pin controls commutation timing via an external capacitor. Internal charge/discharge currents (ICHG = 0.9–1.5µA, IDHG = 0.1–0.25µA) set the oscillation period, determining fan speed. The CT clamp voltage (1.3–1.7V) and comparator threshold (0.3–0.7V) define switching hysteresis, enabling stable speed regulation without microcontroller involvement.
Is an external Hall sensor required for AM4951MPTR-G1 operation?
Yes - AM4951MPTR-G1 requires an external Hall-effect sensor for rotor position detection. It provides differential inputs (IN+, IN−) but no integrated Hall bias; therefore, a separate 1.5V bias network (e.g., resistor divider from VCC) must be implemented, unlike AM4952 which includes built-in VHB = 1.5V.
AM4951MPTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- 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-PSOP
AM4951MPTR-G1 FAQ
1.How can I place an order for AM4951MPTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AM4951MPTR-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 AM4951MPTR-G1 reliable?
The price and inventory of AM4951MPTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AM4951MPTR-G1 is usually 5 days.
3.What payment methods are accepted for AM4951MPTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AM4951MPTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AM4951MPTR-G1?
AM4951MPTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AM4951MPTR-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 AM4951MPTR-G1?
For technical support, including AM4951MPTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AM4951MPTR-G1 requirements.
6.How does Aetrix verify that AM4951MPTR-G1 is sourced from the original manufacturer or authorized distributors?
All AM4951MPTR-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 AM4951MPTR-G1 meets industry standards.
7.What is the process for return or replacement of AM4951MPTR-G1?
All AM4951MPTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AM4951MPTR-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 AM4951MPTR-G1 part is unused and in its original packaging.
Return procedure for AM4951MPTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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