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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

Diodes Incorporated AM4953MMTR-G1

Name: AM4953MMTR-G1
Brand: Diodes Incorporated
SKU: AM4953MMTR-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AM4953MMTR-G1

Manufacturer:: Diodes Incorporated

Category:: Motor Drivers, Controllers

Package:: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)

Datasheet:: AM4953MMTR-G1.pdf

Description:: IC MOTOR DRIVER 2.2V-16V 10MSOP

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Product details

Overview

AM4953MMTR-G1 from BCD Semiconductor Manufacturing Limited is a single-phase BTL-output linear fan motor driver IC designed for DC brushless fan control in thermal management systems. It integrates Hall sensor bias (1.45 V), FG/RD tachometer outputs, lock detection with automatic restart, and thermal protection. Operates from 2.2 V to 16 V supply, delivers 300 mA typical output current, and achieves total saturation voltage of 1.2 V at that load - enabling high-efficiency, low-noise cooling in space-constrained consumer electronics.

For engineers reviewing the AM4953MMTR-G1 datasheet, AM4953MMTR-G1 pinout, AM4953MMTR-G1 application, or AM4953MMTR-G1 equivalent, key selection criteria include its BTL full-wave drive architecture, integrated Hall bias and dual tach outputs (FG & RD), lock-protect behavior, thermal shutdown threshold, and compatibility with MSOP-10 packaging for PCB area optimization in fan control modules.

Technical Context

The AM4953 implements a bipolar-process-based linear BTL driver with internal CT oscillator timing control, enabling precise commutation timing for single-phase BLDC fans. Its functional block includes dedicated Hall input comparators with 8–20 mV sensitivity, built-in 1.45 V Hall bias (VHB), and dual open-drain tachometer outputs (FG and RD) supporting both rotation detection and stall reporting.

Lock protection operates via CT voltage monitoring: when rotor lock causes abnormal CT discharge, the IC disables both high-side and low-side outputs and enters auto-restart mode upon recovery. Thermal protection activates at junction temperatures exceeding safe operating limits, independent of ambient conditions, ensuring reliability under sustained overload or poor heatsinking.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.2 V to 16 V - supports wide-input operation across 3.3 V, 5 V, and 12 V fan rails without external regulators.
Total Output Saturation Voltage	1.2 V (typical, I_OUT = 300 mA) - minimizes power loss and self-heating during continuous fan drive.
Hall Bias Voltage (VHB)	1.45 V (typical, I_HB = 5 mA) - directly powers common 3-pin Hall sensors (e.g., AH921) without external bias circuitry.
FG/RD Output Type	Open-drain, 10 mA sink capability - enables flexible pull-up to system logic voltage (up to 15 V) for tach signal interfacing.
Operating Temperature Range	−40 °C to +105 °C - qualified for CPU cooler, notebook, and automotive cabin audio environments.
Thermal Resistance (θ_JA)	195 °C/W (MSOP-10) - defines maximum power dissipation (585 mW) before junction exceeds 125 °C at 25 °C ambient.
CT Charge/Discharge Ratio	7 (typical) - sets commutation frequency stability and tolerance to capacitor aging or temperature drift.

Pinout & Package

AM4953MMTR-G1 is packaged in a 10-pin MSOP (Mini Small Outline Package) with 0.5 mm pitch, 3.0 mm × 3.0 mm body size, and exposed thermal pad for enhanced heat dissipation in fan driver PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
IN+	Hall sensor positive input	Accepts Hall output high signal; comparator threshold is V_CP = 0.45 V (typ).
IN−	Hall sensor negative input	Accepts Hall output low reference; differential input enables noise-immune commutation.
CT	Oscillator timing capacitor node	Controls BTL switching frequency via external RC network; charge/discharge ratio determines timing accuracy.
OUT1 / OUT2	BTL output terminals	Drive fan coil in push-pull configuration; each delivers up to 800 mA peak current.
GND	Power and signal ground reference	Common return for Hall bias, CT oscillator, and output stage; requires low-impedance PCB plane.
VCC	Positive supply input	Accepts 2.2–16 V; internal regulator powers bias circuits and logic; bypass capacitor required.
FG	Fan rotation pulse output	Open-drain tach signal synchronized to fan pole count; used for RPM feedback and speed regulation.
RD	Rotation detection / stall indicator	Asserts low during valid rotation; remains high during lock condition - direct stall flag for host MCU.
HB	Hall sensor bias output	Provides regulated 1.45 V bias current (5 mA typical) to power external Hall ICs like AH921.
NC	No connect	Pin 9 in MSOP-10 package is unconnected; must be left floating or tied to GND per layout guidelines.

Key Features

Feature	Design Value
BTL full-wave linear drive	Eliminates external H-bridge transistors; reduces BOM count and PCB footprint while maintaining smooth torque delivery.
Integrated Hall bias (VHB = 1.45 V)	Removes need for external bias resistor network, simplifying design and improving Hall signal consistency across temperature.
Dual tach outputs (FG + RD)	Enables simultaneous RPM measurement (FG) and real-time stall detection (RD), critical for fail-safe thermal control loops.
Lock shutdown with auto-restart	Prevents overheating during fan stall by cutting output current, then resumes operation automatically when rotation resumes - no host intervention required.
Thermal protection circuit	Shuts down output when junction temperature exceeds safe limit, protecting IC and fan coil from thermal runaway under overload or blocked airflow.

Applications

Notebook Fan Control

CPU Cooler Module

Use Scenario: Integrated cooling solution in ultra-thin laptops where acoustic noise and board space are tightly constrained.

IC Role / Device Role / Timing Role: Single-chip BTL driver providing Hall-commutated rotation, tach feedback, and stall detection without external FETs or bias components.

Use Value: Reduces component count by ≥4 (vs discrete H-bridge + bias + tach logic), cuts PCB area by 35%, and lowers audible noise through linear drive topology.

Use Scenario: Active thermal management subsystem in desktop and workstation CPUs requiring reliable, silent fan operation under variable thermal loads.

IC Role / Device Role / Timing Role: Primary motor controller managing commutation timing via CT oscillator, delivering stable 300 mA drive current with <1.2 V dropout.

Use Value: Enables fan startup at 2.2 V (supporting low-power idle states) and maintains operation up to 16 V (for transient overvoltage resilience).

Car Audio Amplifier Cooling

AC-DC Power Supply Fan Control

Use Scenario: Forced-air cooling for Class D amplifier modules mounted in vehicle dashboards or trunk-mounted enclosures.

IC Role / Device Role / Timing Role: Fan driver with −40 °C to +105 °C rating and integrated thermal shutdown, interfacing directly with automotive-grade Hall sensors.

Use Value: Eliminates need for external thermal sensor or watchdog MCU polling - lock protection and auto-restart ensure uninterrupted cooling during vibration-induced stalling.

Use Scenario: Intelligent cooling for enclosed switch-mode power supplies in set-top boxes, gaming adapters, and industrial PSUs.

IC Role / Device Role / Timing Role: System-level fan controller receiving thermal feedback from PSU ICs and modulating fan speed via FG feedback loop.

Use Value: Dual tach outputs allow host microcontroller to distinguish between slow rotation (low FG freq) and complete stall (RD high), enabling graded fault response.

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	Larger SOIC-16 package; higher 1.5 A peak current; no integrated Hall bias; requires external V_Bias.	Targets higher-power 50–100 mm fans; lacks auto-restart - needs MCU supervision for lock recovery.	Select when >300 mA continuous drive or external Hall bias flexibility is required; not drop-in due to pinout and bias architecture differences.
ON SEMICONDUCTOR NCV7703BDR2G	3-channel half-bridge; supports 3-phase fans; no FG/RD outputs; requires external tach conditioning.	Designed for multi-phase BLDC fans in automotive HVAC; not suitable for single-phase BTL topology or compact consumer form factors.	Choose only for 3-phase fan systems; incompatible with AM4953's Hall interface, tach outputs, and BTL drive architecture.

Compared with A3920KLPTR-T and NCV7703BDR2G, AM4953MMTR-G1 offers superior integration for space-limited single-phase fans - combining Hall bias, dual tach outputs, lock auto-restart, and MSOP-10 packaging in one device - whereas alternatives require additional components or support different motor topologies.

Availability

AM4953MMTR-G1 is available at Aetrix Electronics and suitable for notebook thermal management, CPU cooler modules, and car audio amplifier cooling systems requiring stable component supply, RoHS-compliant green packaging, and long-term lifecycle assurance.

Supply support for AM4953MMTR-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 automotive markets.

The AM4953 belongs to BCD's fan motor driver product line, engineered specifically for silent, high-reliability thermal management in compact electronics - emphasizing integration of Hall bias, tach outputs, and protection features to reduce system-level design complexity.

FAQ

What is the function of the CT pin on AM4953MMTR-G1?

The CT pin connects to an external RC network that sets the BTL commutation frequency. Its charge/discharge current ratio (7:1 typical) ensures stable timing against capacitor tolerance and temperature drift. The CT voltage swing triggers internal comparators to control output stage switching, directly determining fan speed under open-loop operation.

Does AM4953MMTR-G1 support PWM speed control?

No - AM4953MMTR-G1 uses fixed-frequency BTL commutation controlled by the CT oscillator and Hall sensor inputs. Speed is adjusted by varying VCC (2.2–16 V range) or using external circuitry to modulate Hall signal amplitude; it does not accept PWM input on any pin and lacks dedicated speed-control interface.

How does the RD output behave during fan lock?

During rotor lock, the RD pin remains continuously high (open-drain, not pulled low). This state persists until rotation resumes and two consecutive Hall transitions are detected, at which point RD returns to toggling - providing a clean, latched stall flag for host microcontrollers without debouncing logic.

Can AM4953MMTR-G1 drive a fan without an external Hall sensor?

No - the AM4953MMTR-G1 requires a 3-wire Hall-effect sensor (e.g., AH921) connected to IN+, IN−, and HB pins for commutation. It has no internal sensor or alternative timing mode; operation without Hall input results in undefined output states and potential latch-up due to missing zero-crossing detection.

AM4953MMTR-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:: 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:: 10-MSOP

AM4953MMTR-G1 FAQ

1.How can I place an order for AM4953MMTR-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AM4953MMTR-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 AM4953MMTR-G1 reliable?

The price and inventory of AM4953MMTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AM4953MMTR-G1 is usually 5 days.

3.What payment methods are accepted for AM4953MMTR-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AM4953MMTR-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AM4953MMTR-G1?

AM4953MMTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AM4953MMTR-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 AM4953MMTR-G1?

For technical support, including AM4953MMTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AM4953MMTR-G1 requirements.

6.How does Aetrix verify that AM4953MMTR-G1 is sourced from the original manufacturer or authorized distributors?

All AM4953MMTR-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 AM4953MMTR-G1 meets industry standards.

7.What is the process for return or replacement of AM4953MMTR-G1?

All AM4953MMTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AM4953MMTR-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 AM4953MMTR-G1 part is unused and in its original packaging.

Return procedure for AM4953MMTR-G1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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