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Diodes Incorporated AM4953FMTR-G1
- Part No.:
- AM4953FMTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Motor Drivers, Controllers
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AM4953FMTR-G1.pdf
- Description:
- IC MOTOR DRIVER 2.2V-16V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,849
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Product details
Overview
AM4953FMTR-G1 from BCD Semiconductor is a single-phase BTL-output linear fan motor driver IC with built-in Hall sensor bias (VHB = 1.45 V), FG/RD dual output, lock shutdown, and automatic restart functionality. It operates from 2.2 V to 16 V, delivers 300 mA typical output current, and achieves total saturation voltage of 1.2 V at that load-enabling silent, high-efficiency DC fan control in CPU cooling systems.
For engineers reviewing the AM4953FMTR-G1 datasheet, AM4953FMTR-G1 pinout, AM4953FMTR-G1 application, or AM4953FMTR-G1 equivalent, key selection criteria include its FG/RD output configuration, PSOP-8 thermal performance (θJC = 36 °C/W), Hall bias stability, low-voltage drive capability, and integrated thermal protection for continuous-duty fan systems.
Technical Context
The AM4953FMTR-G1 implements a bipolar-process BTL linear drive architecture with differential Hall input sensing and internal CT-based timing control. Its functional block includes dedicated IN+/IN− comparator inputs, CT charge/discharge circuitry (ICHG = 1.7 µA typ, IDHG = 0.27 µA typ), and independent FG (tachometer) and RD (rotation detection) open-drain outputs.
It supports full-wave commutation via external Hall sensor feedback and features automatic lock detection triggered by stalled rotor conditions-halting output current and restarting only after rotational recovery. The IC's thermal shutdown threshold is embedded within its 125 °C max junction temperature rating and PSOP-8 package's 960 mW power dissipation limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2 V to 16 V - enables direct compatibility with 3.3 V, 5 V, and 12 V system rails without LDO pre-regulation. |
| Total Output Saturation Voltage | 1.2 V (typ, IOUT = 300 mA) - minimizes conduction loss and self-heating during continuous fan operation. |
| Hall Bias Voltage (VHB) | 1.45 V (typ, IHB = 5 mA) - provides stable excitation for common 3-pin Hall sensors (e.g., AH921) without external biasing. |
| FG/RD Output Type | Open-drain, 10 mA sink capability - allows flexible pull-up to system logic voltage (up to 15 V) and direct interface with microcontroller GPIOs. |
| Thermal Resistance (Junction-to-Case) | 36 °C/W (PSOP-8) - enables higher sustained power dissipation than MSOP/SOIC variants, critical for compact fan modules. |
| Lock Protection Response | Automatic shutdown + restart on rotation recovery - eliminates need for external watchdog or MCU intervention in fan stall events. |
| Operating Ambient Temperature | –40 °C to +105 °C - qualified for deployment in CPU heatsink proximity and automotive cabin electronics environments. |
Pinout & Package
The AM4953FMTR-G1 is packaged in PSOP-8 (Power Small Outline Package, 8-pin), featuring exposed thermal pad for enhanced heat transfer and footprint compatibility with SOIC-8 layouts. Pin numbering follows standard top-view orientation with Pin 1 marked by dot or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: IN+ | Hall sensor positive input | Differential comparator input accepting Hall output high state; referenced to IN− for noise-immune sensing. |
| 2: HB | Hall bias output | Provides regulated 1.45 V bias to 3-wire Hall sensor; eliminates external bias resistor network. |
| 3: IN− | Hall sensor negative input | Common-mode reference for IN+; enables rejection of supply and EMI noise on Hall lines. |
| 4: CT | Timing capacitor node | Controls internal oscillator frequency and phase timing; sets motor speed range via external capacitor value. |
| 5: OUT1 | BTL output terminal 1 | One side of push-pull BTL bridge; drives one end of fan coil with linear current control. |
| 6: GND | Power and signal ground | Common return for bias, output, and thermal pad; must be low-impedance connection to minimize noise coupling. |
| 7: OUT2 | BTL output terminal 2 | Complementary BTL output driving opposite end of fan coil; enables full-wave drive without H-bridge external logic. |
| 8: VCC | Positive supply input | Accepts 2.2–16 V; powers all internal circuits including Hall bias, comparators, and output transistors. |
Key Features
| Feature | Design Value |
|---|---|
| BTL Linear Drive Architecture | Eliminates switching noise and EMI typical of PWM drivers-critical for audio-sensitive applications like car audio amplifiers. |
| Integrated FG & RD Outputs | Enables simultaneous tachometer feedback and rotation status monitoring using single IC-reducing BOM count vs. discrete solutions. |
| Auto-Restart Lock Protection | Resumes fan operation automatically after stall clearance-prevents system-level thermal shutdown in CPU cooling loops. |
| Wide Supply Range (2.2–16 V) | Supports direct integration into legacy 5 V and modern 12 V fan rails without level-shifting or voltage translation circuitry. |
| PSOP-8 Thermal Performance | 960 mW max power dissipation and 36 °C/W θJC allow reliable operation at 300 mA load in space-constrained fan assemblies. |
Applications
| CPU Cooling Fan Control | Car Audio System Fan Management |
|---|---|
Use Scenario: Regulating 12 V axial fans mounted directly on CPU heatsinks in desktop and server platforms. IC Role / Device Role / Timing Role: Single-chip BTL linear driver with Hall feedback, FG tach output, and thermal-aware lock protection. Use Value: Silent operation avoids acoustic interference with high-fidelity audio subsystems; auto-restart prevents thermal throttling during transient stalls. | Use Scenario: Controlling cooling fans inside Class-D amplifier modules and head-unit power supplies where EMI must be minimized. IC Role / Device Role / Timing Role: Low-noise linear motor driver with integrated Hall bias and dual FG/RD outputs for closed-loop speed validation. Use Value: Eliminates PWM switching harmonics near sensitive analog audio paths; PSOP-8 package ensures thermal reliability in sealed enclosures. |
| Notebook Internal Fan Module | Industrial Power Supply Fan Monitoring |
Use Scenario: Driving compact 5 V blower fans in ultra-thin notebook chassis with strict height and thermal constraints. IC Role / Device Role / Timing Role: Space-optimized PSOP-8 fan driver with 2.2 V minimum supply support for battery-backed operation. Use Value: Enables fan operation down to 2.2 V during brown-out conditions; small footprint reduces PCB area vs. SOIC-8 alternatives. | Use Scenario: Managing forced-air cooling in 1U rack-mounted AC/DC power supplies requiring continuous duty cycle and fault resilience. IC Role / Device Role / Timing Role: Fault-tolerant fan controller with lock detection, thermal shutdown, and FG-based speed verification. Use Value: Prevents catastrophic overheating by halting output on stall and verifying rotation before resuming-meeting IEC 62368-1 safety requirements. |
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 |
|---|---|---|---|
| ALLEGRO A3920KLPTR-T | Requires external Hall bias resistor; no integrated VHB; FG-only output (no RD); SOIC-8 only. | Lacks auto-restart and dual FG/RD diagnostics; less suitable for safety-critical thermal management loops. | Select when cost sensitivity outweighs diagnostic completeness and Hall bias integration is acceptable. |
| ON SEMICONDUCTOR NCV7703BDR2G | Half-bridge (not BTL) output; requires external flyback diodes; no Hall bias; SPI interface instead of analog control. | Designed for multi-fan clusters with digital command; not pin- or function-compatible for direct replacement. | Choose for programmable multi-fan systems needing diagnostics over analog simplicity and silent operation. |
Compared with A3920KLPTR-T and NCV7703BDR2G, the AM4953FMTR-G1 uniquely integrates Hall bias, dual FG/RD outputs, and auto-restart lock protection in a thermally optimized PSOP-8 package-making it the only solution meeting silent, self-monitoring, and space-constrained requirements simultaneously.
Availability
AM4953FMTR-G1 is available at Aetrix Electronics and suitable for CPU cooling systems, car audio amplifier thermal management, and notebook internal fan modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AM4953FMTR-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 and foundry partner specializing in high-reliability power management and motor control solutions for consumer, computing, and automotive markets.
The AM4953 belongs to BCD's fan motor driver product line, engineered specifically for low-noise, thermally robust, Hall-sensor-based DC fan control in space- and EMI-constrained electronic systems.
FAQ
What is the purpose of the CT pin on the AM4953FMTR-G1?
The CT pin connects to an external timing capacitor that sets the internal oscillator frequency and determines motor commutation timing. Its charge/discharge current ratio (RCT = 7 typ) defines speed regulation linearity, and the CT clamp voltage (1.45 V typ) stabilizes timing against supply variation-enabling precise RPM control without microcontroller involvement.
Does the AM4953FMTR-G1 require external components for Hall sensor interfacing?
No external bias resistors are required: the HB pin provides a regulated 1.45 V bias current (5 mA typ) directly to 3-wire Hall sensors like AH921. However, a 51 kΩ pull-down resistor on IN− and decoupling capacitor C1 (>2.2 µF) on the fan supply line are recommended per the datasheet for noise immunity and regenerative current handling.
How does the lock protection function respond to a stalled fan condition?
When rotor lock is detected via absence of Hall transitions and abnormal current signature, the AM4953FMTR-G1 disables both OUT1 and OUT2 outputs within microseconds, reducing power dissipation and preventing thermal damage. Upon detection of valid Hall edge transitions again, it automatically re-enables drive-no external reset or MCU command is needed.
Can the AM4953FMTR-G1 drive fans at voltages below 3.3 V?
Yes-the AM4953FMTR-G1 operates down to 2.2 V supply, enabling use with Li-ion battery-powered devices or brown-out scenarios. At 2.2 V, output current capability decreases proportionally, but the IC maintains functional lock detection, FG generation, and thermal protection-verified across –40 °C to +105 °C ambient.
AM4953FMTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- 800mA
- Voltage - Supply:
- 2.2V ~ 16V
- Voltage - Load:
- 2.2V ~ 16V
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AM4953FMTR-G1 FAQ
1.How can I place an order for AM4953FMTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AM4953FMTR-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 AM4953FMTR-G1 reliable?
The price and inventory of AM4953FMTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AM4953FMTR-G1 is usually 5 days.
3.What payment methods are accepted for AM4953FMTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AM4953FMTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AM4953FMTR-G1?
AM4953FMTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AM4953FMTR-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 AM4953FMTR-G1?
For technical support, including AM4953FMTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AM4953FMTR-G1 requirements.
6.How does Aetrix verify that AM4953FMTR-G1 is sourced from the original manufacturer or authorized distributors?
All AM4953FMTR-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 AM4953FMTR-G1 meets industry standards.
7.What is the process for return or replacement of AM4953FMTR-G1?
All AM4953FMTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AM4953FMTR-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 AM4953FMTR-G1 part is unused and in its original packaging.
Return procedure for AM4953FMTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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