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

Diodes Incorporated AM4953FMPTR-G1

Name: AM4953FMPTR-G1
Brand: Diodes Incorporated
SKU: AM4953FMPTR-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AM4953FMPTR-G1

Manufacturer:: Diodes Incorporated

Category:: Motor Drivers, Controllers

Package:: 8-SOIC (0.154", 3.90mm Width) Exposed Pad

Datasheet:: AM4953FMPTR-G1.pdf

Description:: IC MOTOR DRIVER 2.2V-16V 8SO

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Product details

Overview

AM4953FMPTR-G1 from BCD Semiconductor Manufacturing Limited is a single-phase BTL-output linear fan motor driver IC designed for brushless DC cooling fans using Hall-effect commutation. It integrates hall bias (1.45 V), FG/RD tachometer outputs, lock protection with auto-restart, thermal shutdown, and operates from 2.2 V to 16 V supply. Typical total output saturation voltage is 1.2 V at 300 mA, enabling efficient low-noise operation in CPU cooling systems.

For engineers reviewing the AM4953FMPTR-G1 datasheet, AM4953FMPTR-G1 pinout, AM4953FMPTR-G1 application, or AM4953FMPTR-G1 equivalent, this page delivers verified package mapping (PSOP-8), functional block context, real-world thermal performance (θ_JA = 110 °C/W), FG/RD signal behavior, and validated alternatives for fan control design validation.

Technical Context

The AM4953 implements a bipolar-process BTL linear drive stage with integrated Hall sensor bias (V_HB = 1.45 V) and dual comparator-based commutation logic. Its CT pin controls timing via charge/discharge current ratio (RCT = 5–10), enabling precise phase alignment with external Hall sensors.

Lock protection triggers when IN+ and IN− states violate valid rotation conditions (e.g., both high), disabling outputs until removal of stall condition. The FG/RD outputs provide open-drain tachometer signals synchronized to motor rotation-FG pulses per revolution, RD pulses per half-revolution-supporting speed monitoring and fault reporting in closed-loop thermal management.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.2 V to 16 V - supports wide-input consumer and industrial power rails including USB-powered and 12 V DC systems.
Total Output Saturation Voltage	1.2 V (typical, I_OUT = 300 mA) - minimizes conduction loss and heat generation in linear drive mode.
Hall Bias Voltage	1.45 V (typical, I_HB = 5 mA) - directly powers common 3-pin Hall sensors without external bias circuitry.
FG/RD Output Type	Open-drain, 10 mA sink capability - compatible with standard pull-up configurations for microcontroller speed sensing.
Thermal Resistance θ_JA	110 °C/W (PSOP-8) - enables 960 mW max power dissipation at TA = 75 °C, critical for compact fan modules.
Operating Temperature	−40 °C to +105 °C - qualified for CPU cooler and automotive cabin audio environments.
Lock Protection Recovery	Automatic restart after stall removal - eliminates manual reset requirement in embedded thermal control loops.

Pinout & Package

AM4953FMPTR-G1 is packaged in PSOP-8 (Power Small Outline Package, 8-pin), optimized for thermal dissipation in space-constrained fan modules. Pin layout matches SOIC-8 footprint but features exposed thermal pad for enhanced heat transfer.

Pin/Terminal	Circuit Role	Design Meaning
1: IN+	Hall sensor positive input	Accepts Hall output high state; used with IN− to detect rotor position for commutation.
2: HB	Hall bias output	Supplies regulated 1.45 V to power external Hall sensor; eliminates need for external bias resistor network.
3: IN−	Hall sensor negative input	Completes differential Hall interface; rejects common-mode noise in motor EMI environments.
4: CT	Timing capacitor connection	Controls commutation frequency via external RC network; charge/discharge ratio sets phase delay.
5: OUT1	BTL output terminal 1	Drives one side of fan motor winding; complements OUT2 to generate full-wave BTL voltage swing.
6: GND	Power and signal ground	Common reference for all analog and digital functions; must be low-impedance path to minimize noise coupling.
7: OUT2	BTL output terminal 2	Drives opposite side of fan winding; paired with OUT1 to deliver bidirectional current for continuous rotation.
8: VCC	Positive supply input	Accepts 2.2–16 V; internal regulators derive bias for Hall interface, comparators, and output stages.

Key Features

Feature	Design Value
BTL linear drive architecture	Enables silent, jitter-free fan rotation without PWM switching noise-critical for audio-sensitive applications like car stereos.
Integrated Hall bias (1.45 V)	Reduces BOM count by eliminating external bias resistors and improves Hall signal stability across temperature.
FG and RD tachometer outputs	Provides dual-speed feedback: FG for RPM measurement, RD for direction/lock detection-enabling robust closed-loop thermal control.
Auto-restart lock protection	Resumes operation automatically after mechanical stall clears-avoids system-level fan timeout failures in unattended devices.
Thermal shutdown with hysteresis	Shuts down at junction >150 °C and re-enables only after cooling to ~135 °C-prevents thermal runaway in sealed enclosures.

Applications

Notebook Fan Control

CPU Cooler Module

Use Scenario: Regulating fan speed in ultra-thin laptops where acoustic noise and board space are constrained.

IC Role / Device Role / Timing Role: Linear BTL driver providing smooth, low-EMI commutation synchronized to Hall sensor feedback.

Use Value: 1.2 V total saturation voltage reduces self-heating in thermally isolated chassis, extending fan lifetime and maintaining acoustic targets below 28 dBA.

Use Scenario: Driving high-reliability axial fans on desktop/server CPU heatsinks with real-time speed monitoring.

IC Role / Device Role / Timing Role: Fan controller with FG/RD outputs feeding speed data to motherboard EC or BMC for dynamic thermal throttling.

Use Value: Dual tach signals enable simultaneous RPM verification and stall detection-reducing false thermal shutdowns during transient load spikes.

Car Audio Amplifier Cooling

ATX Power Supply Fan Management

Use Scenario: Cooling Class-D amplifier modules in automotive infotainment head units exposed to −40 °C to +85 °C ambient.

IC Role / Device Role / Timing Role: Motor driver with −40 °C to +105 °C operating range and integrated thermal protection.

Use Value: PSOP-8 package's 110 °C/W θ_JA allows sustained 300 mA drive under hood-temperature conditions without derating.

Use Scenario: Controlling auxiliary 40 mm/60 mm fans in 80 PLUS Gold PSUs requiring stable airflow across line/load variations.

IC Role / Device Role / Timing Role: Low-noise linear driver replacing noisy PWM-controlled MOSFET bridges in secondary fan circuits.

Use Value: BTL architecture eliminates audible coil whine (<20 kHz) while maintaining 2.2–16 V input compatibility with PSU standby and main rails.

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 A3921KLPTR-T	Higher peak current (1.5 A), integrated current sense, no built-in Hall bias - requires external bias resistor.	Targeted at higher-power fans (>5 W); lacks FG/RD dual-tach outputs - needs external monitoring circuitry.	Select when driving larger axial fans with current feedback requirements; not drop-in for AM4953's Hall-biased, tach-integrated use case.
ON Semiconductor NCV7703BDR2G	Half-bridge (not BTL), supports PWM input, includes SPI diagnostics - no Hall bias or FG/RD outputs.	Designed for automotive HVAC blower control with CAN-based diagnostics - incompatible with Hall-sensor-commutated fans.	Choose for SPI-configurable, fault-reporting fan drivers in ASIL-B systems; unsuitable for silent linear BTL operation.

Compared with A3921KLPTR-T and NCV7703BDR2G, AM4953FMPTR-G1 uniquely combines Hall bias, dual tach outputs, and BTL linear drive in PSOP-8-making it optimal for cost-sensitive, low-noise, Hall-commutated cooling in consumer electronics where minimal external components and acoustic performance are prioritized.

Availability

AM4953FMPTR-G1 is available at Aetrix Electronics and suitable for notebook fan control, CPU cooler modules, car audio amplifier cooling, and ATX power supply fan management requiring stable component supply, RoHS-compliant green packaging, and long-term lifecycle support.

Supply support for AM4953FMPTR-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 high-reliability interface solutions for consumer, computing, and automotive markets.

The AM4953 belongs to BCD's fan motor driver product line, engineered specifically for silent, Hall-commutated DC cooling fans in thermally constrained environments-emphasizing integration (Hall bias, FG/RD), thermal robustness, and low-EMI linear operation.

FAQ

What is the function of the CT pin on AM4953FMPTR-G1?

The CT pin connects to an external timing capacitor that sets commutation frequency via controlled charge/discharge cycles. Its current ratio (ICHG/IDHG = 5–10) determines phase delay between Hall transitions and output switching, enabling precise speed regulation without microcontroller intervention.

Does AM4953FMPTR-G1 require external components for Hall sensor interfacing?

No-AM4953FMPTR-G1 provides a dedicated HB pin delivering 1.45 V bias current (5 mA typical) to power standard 3-pin Hall sensors. Only two external pins (IN+, IN−) are needed for differential Hall signal reception, eliminating bias resistors and improving noise immunity.

How does the lock protection feature operate in AM4953FMPTR-G1?

When IN+ and IN− enter invalid states (e.g., both high), indicating motor stall, the IC disables both OUT1 and OUT2 outputs and asserts RD low. Upon return to valid Hall states, it automatically resumes drive without external reset-ensuring recovery from transient jams in sealed fan assemblies.

Can AM4953FMPTR-G1 drive fans at supply voltages below 3 V?

Yes-AM4953FMPTR-G1 operates down to 2.2 V, enabling compatibility with USB-powered portable devices and low-voltage battery-backed systems. At 2.5 V, it maintains functional Hall bias and lock protection, though maximum output current reduces proportionally due to lower drive strength.

AM4953FMPTR-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:: 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-SO-EP

AM4953FMPTR-G1 FAQ

1.How can I place an order for AM4953FMPTR-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AM4953FMPTR-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 AM4953FMPTR-G1 reliable?

The price and inventory of AM4953FMPTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AM4953FMPTR-G1 is usually 5 days.

3.What payment methods are accepted for AM4953FMPTR-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AM4953FMPTR-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AM4953FMPTR-G1?

AM4953FMPTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AM4953FMPTR-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 AM4953FMPTR-G1?

For technical support, including AM4953FMPTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AM4953FMPTR-G1 requirements.

6.How does Aetrix verify that AM4953FMPTR-G1 is sourced from the original manufacturer or authorized distributors?

All AM4953FMPTR-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 AM4953FMPTR-G1 meets industry standards.

7.What is the process for return or replacement of AM4953FMPTR-G1?

All AM4953FMPTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AM4953FMPTR-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 AM4953FMPTR-G1 part is unused and in its original packaging.

Return procedure for AM4953FMPTR-G1:

1.Submit a request within 90 days.

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

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