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Diodes Incorporated AM4951RMPTR-G1
- Part No.:
- AM4951RMPTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Motor Drivers, Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
AM4951RMPTR-G1.pdf
- Description:
- IC MOTOR DRIVER 2.2V-24V 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,895
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Product details
Overview
AM4951RMPTR-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 RD output for rotation detection, and features lock shutdown with automatic restart-enabling reliable thermal management in CPU cooling systems.
For engineers reviewing the AM4951RMPTR-G1 datasheet, AM4951RMPTR-G1 pinout, AM4951RMPTR-G1 application, or AM4951RMPTR-G1 equivalent, this page provides verified functional role, validated PSOP-8 pin mapping, confirmed 2.2–24V operating range, and real-world use cases in notebook fan control and power supply thermal regulation.
Technical Context
The AM4951RMPTR-G1 implements a bipolar-process BTL linear drive architecture with integrated Hall sensor interface and RD output circuitry. Its CT pin controls charge/discharge timing for commutation, while internal 0.5V comparator threshold and 1.5V clamp voltage define precise hall signal conditioning.
It embeds thermal protection, lock-detection logic that disables outputs during stall, and automatic recovery upon condition clearance. The RD output provides open-collector pulse feedback synchronized to motor rotation-distinct from FG output used in AM4951/AM4952 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2V to 24V - supports wide-input DC fan systems including 12V/24V industrial and consumer power rails. |
| Output Saturation Voltage | VSAT_TOTAL = 1.2V (typ, IOUT = 200mA) - minimizes conduction loss and self-heating in continuous fan operation. |
| RD Output Type | Open-collector, low-level voltage ≤0.3V at 5mA - directly interfaces with MCU GPIO or logic-level monitoring circuits. |
| Thermal Resistance θJA | 110°C/W (PSOP-8) - enables 960mW max power dissipation at TA = 25°C, critical for sealed fan module thermal design. |
| Operating Temperature | −40°C to +105°C - qualified for under-hood automotive auxiliary cooling and high-ambient PC chassis environments. |
| Lock Protection | Detects stalled rotor via current/timing anomaly and forces output shutdown within milliseconds - prevents IC thermal runaway. |
Pinout & Package
AM4951RMPTR-G1 is housed in PSOP-8 (Plastic Small Outline Package, exposed pad), optimized for 24V fan applications with enhanced thermal performance (θJA = 110°C/W). The exposed thermal pad must be soldered to PCB copper for effective heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | BTL Output High-Side | Drives one terminal of fan coil; complements OUT2 to generate bidirectional current flow. |
| 2 (OUT2) | BTL Output Low-Side | Completes BTL bridge path; paired switching with OUT1 enables full-wave commutation without external H-bridge. |
| 3 (GND) | Power Ground | Reference for all internal circuits and return path for output current; connects to thermal pad. |
| 4 (IN+) | Hall Sensor Positive Input | Accepts differential Hall sensor output; internal bias sets common-mode range for robust signal acquisition. |
| 5 (IN−) | Hall Sensor Negative Input | Differential input referenced to IN+; rejects EMI in long PCB traces between sensor and IC. |
| 6 (CT) | Commutation Timing Control | External capacitor sets motor rotation period; internal charge/discharge current ratio (6–10×) defines timing accuracy. |
| 7 (VCC) | Supply Input | Accepts 2.2–24V; internal regulator powers analog blocks and protects against overvoltage transients up to 28V. |
| 8 (RD) | Rotation Detection Output | Open-collector pulse output active low per revolution; requires external pull-up for MCU edge-triggered counting. |
Key Features
| Feature | Design Value |
|---|---|
| BTL Linear Drive Architecture | Eliminates external H-bridge MOSFETs and gate drivers; reduces BOM count and layout area for compact fan modules. |
| Integrated Lock Shutdown + Auto-Restart | Halts output current during rotor stall and resumes operation automatically when mechanical obstruction clears-no host intervention required. |
| RD Output with Open-Collector Interface | Provides deterministic, noise-immune tachometer signal compatible with 3.3V/5V microcontrollers without level-shifting. |
| Wide Supply Range (2.2–24V) | Enables single-part inventory across 12V notebook fans and 24V server/industrial cooling systems. |
| Thermal Protection Circuit | Shuts down output before junction temperature exceeds safe limit; recovers after cooldown-prevents permanent damage in sealed enclosures. |
Applications
| CPU Cooling Fan Control | Notebook Internal Fan System |
|---|---|
|
Use Scenario: Regulating speed of 24V axial fans mounted on CPU heatsinks in high-density servers. IC Role / Device Role / Timing Role: BTL driver executing full-wave commutation based on Hall sensor feedback; RD output feeds closed-loop RPM control to system controller. Use Value: Delivers silent, jitter-free rotation at low speeds while maintaining torque margin through 1.2V total saturation drop. |
Use Scenario: Driving dual 12V/24V cooling fans inside ultra-thin laptop chassis with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: Single-chip motor controller handling Hall-based commutation, lock detection, and tach feedback-replacing discrete transistor arrays. Use Value: PSOP-8 package's 110°C/W θJA enables stable operation at 75°C ambient without derating, critical for fan-in-chassis designs. |
| Car Audio Amplifier Cooling | Industrial Power Supply Thermal Management |
|
Use Scenario: Managing forced-air cooling for Class-D audio amplifier modules in automotive head units exposed to −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Fan driver with lock protection ensures fan restarts after temporary ice blockage or dust clogging during cold-soak conditions. Use Value: −40°C to +105°C operating range and auto-restart eliminate need for external watchdog or reset circuitry. |
Use Scenario: Controlling cooling fans in 1U rack-mounted AC/DC power supplies where airflow is constrained and reliability is mission-critical. IC Role / Device Role / Timing Role: Motor controller providing RD pulses for fan health monitoring and thermal foldback via system microcontroller. Use Value: RD output's ≤0.3V low-level voltage ensures clean signal capture even with long PCB traces and noisy SMPS ground planes. |
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 |
|---|---|---|---|
| AM4951MPTR-G1 | Same PSOP-8 package and 24V rating, but outputs FG (tachometer frequency) instead of RD (rotation detection pulse). | Used where speed measurement via frequency counting is preferred over edge-triggered RPM counting. | Select MPTR-G1 when system firmware expects FG-compatible timing resolution; RMPTR-G1 when pulse-per-revolution simplicity is prioritized. |
| AM4952MMTR-G1 | MSOP-10 package, adds HB (Hall bias) output (1.5V), FG+RD dual outputs, and supports 12V only. | Required for designs using Hall sensors lacking internal bias or needing both tach and rotation signals simultaneously. | Choose MMTR-G1 only if dual-output capability and Hall bias sourcing are mandatory; otherwise RMPTR-G1 offers lower cost and smaller footprint for RD-only use. |
Compared with AM4951MPTR-G1, RMPTR-G1 trades FG frequency resolution for deterministic RD pulse timing; versus AM4952MMTR-G1, it sacrifices Hall bias and dual outputs to achieve PSOP-8 thermal performance and 24V compatibility in space-constrained layouts.
Availability
AM4951RMPTR-G1 is available at Aetrix Electronics and suitable for CPU cooling systems, notebook thermal management, and car audio amplifier cooling requiring stable component supply, RoHS-compliant green packaging, and production-ready tape-and-reel delivery.
Supply support for AM4951RMPTR-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 high-reliability mixed-signal solutions for consumer, industrial, and automotive markets.
The AM4951/R/2 series targets cost-sensitive, thermally demanding fan control applications-delivering integrated BTL drive, protection logic, and tach/rotation feedback in minimal footprint packages.
FAQ
What is the function of the CT pin on AM4951RMPTR-G1?
The CT pin sets motor commutation timing via an external capacitor. An internal current source charges and discharges this capacitor, generating a sawtooth waveform whose period determines fan speed. The CT discharge current is 0.1–0.25µA, and the charge/discharge ratio is fixed at 6–10×, ensuring stable timing across voltage and temperature.
Can AM4951RMPTR-G1 drive a 24V fan with 300mA peak current?
No. Absolute maximum peak output current is 500mA, but recommended continuous output is limited to 200mA due to thermal constraints. At 200mA, total saturation voltage is 1.2V (typ), yielding 240mW conduction loss. Exceeding 200mA risks exceeding the PSOP-8 package's 960mW power dissipation limit at elevated ambient temperatures.
How does the lock shutdown feature operate without external components?
Lock detection is implemented internally using output current monitoring and CT timing anomaly detection. When rotor stall occurs, current rises abnormally and commutation timing fails; the IC disables both OUT1 and OUT2 within microseconds and holds shutdown until CT voltage resets-requiring no external sense resistors or comparators.
Is the RD output compatible with 3.3V microcontrollers?
Yes. The RD pin is open-collector with guaranteed low-level voltage ≤0.3V at 5mA sink current. Using a 10kΩ pull-up to 3.3V yields ~0.1mA leakage current and fully compliant logic-low levels, enabling direct connection to standard CMOS inputs without level-shifting circuitry.
AM4951RMPTR-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-SO-EP
AM4951RMPTR-G1 FAQ
1.How can I place an order for AM4951RMPTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AM4951RMPTR-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 AM4951RMPTR-G1 reliable?
The price and inventory of AM4951RMPTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AM4951RMPTR-G1 is usually 5 days.
3.What payment methods are accepted for AM4951RMPTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AM4951RMPTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AM4951RMPTR-G1?
AM4951RMPTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AM4951RMPTR-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 AM4951RMPTR-G1?
For technical support, including AM4951RMPTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AM4951RMPTR-G1 requirements.
6.How does Aetrix verify that AM4951RMPTR-G1 is sourced from the original manufacturer or authorized distributors?
All AM4951RMPTR-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 AM4951RMPTR-G1 meets industry standards.
7.What is the process for return or replacement of AM4951RMPTR-G1?
All AM4951RMPTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AM4951RMPTR-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 AM4951RMPTR-G1 part is unused and in its original packaging.
Return procedure for AM4951RMPTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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