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

Diodes Incorporated AM4964GTR-G1

Name: AM4964GTR-G1
Brand: Diodes Incorporated
SKU: AM4964GTR-G1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AM4964GTR-G1

Manufacturer:: Diodes Incorporated

Category:: Motor Drivers, Controllers

Package:: 20-TSSOP (0.173", 4.40mm Width) Exposed Pad

Datasheet:: AM4964GTR-G1.pdf

Description:: IC MOTOR DRIVER 3.5V-16V 20TSSOP

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Product details

Overview

AM4964GTR-G1 from Diodes Incorporated is a single-phase full-wave BLDC motor driver IC with integrated Hall sensor interface, dual-mode speed control (external PWM + thermistor-based temperature feedback), rotor lock protection with auto-restart, and tachometer (FG) output. It delivers 1.0 A output current, operates from 3.5 V to 16 V supply, and supports adjustable low/high temperature corners (e.g., 24–46 °C range) for thermal fan speed regulation in CPU cooler applications.

For engineers reviewing the AM4964GTR-G1 datasheet, AM4964GTR-G1 pinout, AM4964GTR-G1 application, or AM4964GTR-G1 equivalent, key selection considerations include its combined PWM+thermistor speed control architecture, TSSOP-20EP package thermal performance (θ_JA = 114 °C/W), FG open-collector tach output, and built-in lock-detect timing via external CT capacitor - all critical for reliable brushless fan control in thermally constrained systems.

Technical Context

The AM4964GTR-G1 implements a Hall-commutated H-bridge driver with internal triangle-wave oscillator (f_PWM = 18–32 kHz) and analog comparators that dynamically blend external PWM duty cycle and thermistor-derived voltage (via RT/TH/TL pins) to generate output PWM duty. Its dual ground structure separates PGND (power return for OUT1/OUT2) from SGND (signal reference), minimizing noise coupling into Hall sensing and speed control paths.

Lock detection relies on CT pin capacitor charge/discharge asymmetry: I_CHG = 1.15–3.55 µA and I_HDG = 0.115–0.355 µA set t_LCKDET and t_OFF; HB pin supplies 1.25 V ±0.25 V bias to unbuffered Hall elements; IN+/IN− inputs feature ±10–20 mV hysteresis for robust commutation signal rejection.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	3.5 V to 16 V - Supports 5 V and 12 V fan rails; exceeds typical PC cooling rail tolerances.
Output Current Rating	1.0 A continuous - Sufficient to drive high-airflow 40–60 mm axial fans without external FETs.
PWM Frequency	18–32 kHz typ. - Ultrasonic switching avoids audible noise while enabling efficient MOSFET gate drive.
Thermal Shutdown Threshold	Internally set - Protects die during sustained overload or poor PCB thermal design; auto-recovery on cooldown.
FG Output Type	Open-collector - Requires external pull-up; outputs 2× Hall transitions per motor electrical cycle for accurate RPM measurement.
Quiescent Current	5.35–18.75 mA - Low standby power enables always-on thermal management in energy-sensitive systems.
Hall Bias Voltage	1.25 V nominal - Directly powers common 3-pin or 4-pin unbuffered Hall sensors without external regulator.

Pinout & Package

TSSOP-20EP package with exposed thermal pad (soldered to GND or left floating per layout requirements); 0.65 mm pitch, 6.5 mm × 4.4 mm body; θ_JA = 114 °C/W on 2-layer FR4 with 4 thermal vias under pad.

Pin/Terminal	Circuit Role	Design Meaning
OUT1 / OUT2	H-bridge power outputs	Drive motor coil in push-pull; support recirculation path during commutation; rated for 1.0 A sink/source.
IN+ / IN−	Differential Hall sensor inputs	Detect rotor position; ±20 mV hysteresis rejects EMI; accept 50 mV_PP minimum signal from unbuffered Hall elements.
PWM	Speed command input	Accepts 0–100% duty cycle 100 Hz–25 kHz PWM; internally converted to DC control voltage for duty blending.
CF	Control filter node	RC-filtered PWM or DC voltage sets base speed; R3/R4 adjust max duty at TL/TH corners independently.
TL / TH / TA / RADJ	Temperature & slope configuration	Resistor-connected pins set low temp corner (TL), high temp corner (TH), duty gap (TA), and input-output linearity (RADJ).
CT	Lock detect timing	External capacitor sets lock-detect timeout (t_LCKDET) and off-time (t_OFF) via internal I_CHG/I_HDG.
FG	Tachometer output	Open-collector; active-low pulse per Hall transition; requires external pull-up resistor (typically 4.7–10 kΩ).
PGND / SGND	Separate ground returns	PGND carries motor current; SGND references analog comparators and Hall bias - must be joined at single point near VCC decoupling.

Key Features

Feature	Design Value
Combined PWM + thermistor speed control	Simultaneously accepts external PWM signal and RT-pin thermistor voltage to compute blended output duty - eliminates need for MCU-based thermal loop.
Adjustable temperature corners	TL (24–40 °C) and TH (32–46 °C) set via resistors; enables precise fan curve mapping to system thermal profile without firmware changes.
Auto-restart rotor lock protection	Detects stalled motor via CT capacitor timeout; disables outputs for t_OFF, then retries - prevents coil burnout and enables self-recovery.
Built-in Hall bias (HB)	1.25 V regulated output eliminates external bias circuitry for standard unbuffered Hall sensors - reduces BOM count and layout area.
Minimum speed clamp (VMIN)	Voltage-adjustable lower speed limit prevents fan stall at low PWM duty; avoids airflow interruption during light-load thermal conditions.

Applications

CPU Cooler Fan Control

Server Chassis Blower Management

Use Scenario: Regulating airflow in desktop and workstation CPUs based on die temperature and workload PWM signals.

IC Role / Device Role / Timing Role: BLDC motor driver with integrated Hall commutation, dual-input speed control, and FG feedback for closed-loop RPM monitoring.

Use Value: Eliminates need for external microcontroller by directly translating thermistor resistance and PWM duty into motor drive signals - reducing system cost and latency.

Use Scenario: Maintaining consistent airflow across multi-slot server backplanes where ambient temperature gradients require localized thermal response.

IC Role / Device Role / Timing Role: Full-wave motor driver with independent low/high temperature corner adjustment (TL/TH) and duty gap tuning (TA) for zone-specific fan curves.

Use Value: Enables hardware-defined fan profiles that adapt to inlet vs. exhaust thermal zones without host processor intervention or firmware updates.

Industrial Enclosure Extractor Fan

Network Switch Heat Sink Cooling

Use Scenario: Driving high-static-pressure blowers in sealed industrial enclosures where dust accumulation risks rotor lock.

IC Role / Device Role / Timing Role: Motor driver with auto-restart lock protection (CT-configurable timeout) and thermal shutdown for unattended operation.

Use Value: Prevents permanent motor failure during clogged-filter events by cycling drive attempts - extends service interval and improves field reliability.

Use Scenario: Cooling ASIC heat sinks in Layer 3 switches where rapid thermal transients demand fast-response fan control.

IC Role / Device Role / Timing Role: High-bandwidth PWM input interface (up to 25 kHz) combined with low-latency Hall sensing (20 mV hysteresis) for <100 ms speed step response.

Use Value: Matches fan speed to real-time ASIC junction temperature spikes - avoids thermal throttling while minimizing acoustic noise during steady-state operation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar BLDC fan driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ALLEGRO A4964KLPTR-T	Same functional block diagram and pinout; identical TL/TH/TA/RADJ configuration scheme; ±15 mV Hall hysteresis vs. ±20 mV.	Optimized for automotive-grade temperature range (−40 °C to +125 °C); higher ESD rating (4 kV HBM).	Select for extended temperature or automotive qualification needs; not drop-in due to different thermal shutdown threshold.
ON Semiconductor NCP5425DR2G	No integrated Hall bias or FG output; requires external Hall bias and tach conditioning; supports only PWM speed control (no thermistor blending).	Targeted at cost-sensitive, fixed-speed or simple PWM-controlled fans without thermal adaptation.	Select when thermistor-based speed modulation is unnecessary and BOM minimization outweighs integrated features.

Compared with A4964KLPTR-T, AM4964GTR-G1 offers tighter Hall hysteresis and lower quiescent current but lacks AEC-Q100 qualification; versus NCP5425DR2G, it provides full thermal-PWM blending and auto-restart lock protection - critical for unattended thermal management where reliability trumps component count.

Availability

AM4964GTR-G1 is available at Aetrix Electronics and suitable for CPU cooler fan control, server chassis blower management, and industrial enclosure extractor fan applications requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for AM4964GTR-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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in power management, signal integrity, and precision analog solutions for industrial, computing, and consumer markets.

The AM4964 belongs to Diodes' motor driver product line, designed specifically for cost-effective, highly integrated thermal management in PC, server, and industrial cooling systems - emphasizing hardware-based speed control, robust lock protection, and minimal external component count.

FAQ

What is the function of the CT pin, and how is its capacitor value selected?

The CT pin sets rotor lock detection timeout (t_LCKDET) and auto-restart off-time (t_OFF) via an external capacitor. Its value is calculated using I_CHG = 1.15–3.55 µA and I_HDG = 0.115–0.355 µA from the datasheet's timing equations. A 100 nF capacitor yields ~250 ms t_LCKDET and ~2.5 s t_OFF under typical conditions - sufficient for most 40–60 mm fans to recover from transient stalls.

Can the AM4964GTR-G1 drive a motor without a Hall sensor?

No. The AM4964GTR-G1 requires Hall sensor feedback for commutation: IN+ and IN− inputs decode rotor position to sequence OUT1/OUT2 drive. It does not support sensorless back-EMF detection. Applications must use either 3-pin buffered or 4-pin unbuffered Hall elements biased by the internal 1.25 V HB output.

How is the FG output configured, and what load can it drive?

The FG pin is an open-collector output referenced to PGND, requiring an external pull-up resistor (typically 4.7 kΩ to VCC). It sinks up to 10 mA and drives logic-level pulses at twice the motor's electrical frequency. Maximum capacitive load is 50 pF; longer traces require series termination to prevent ringing.

What is the role of the VMIN pin, and how does it interact with the CF pin?

VMIN sets the minimum motor speed by clamping the effective control voltage: when CF voltage exceeds VMIN, the internal triangle wave compares against VMIN instead of CF - forcing a floor on output PWM duty. A resistor divider from VCC to PGND sets VMIN between 2.48 V and 3.22 V; connecting VMIN directly to CF disables minimum speed limiting.

AM4964GTR-G1 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 20-TSSOP (0.173", 4.40mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Motor Type - Stepper:: -

Motor Type - AC, DC:: Brushless DC (BLDC)

Function:: Driver - Fully Integrated, Control and Power Stage

Output Configuration:: Half Bridge (2)

Interface:: PWM

Technology:: Bipolar

Step Resolution:: -

Applications:: Fan Motor Driver

Current - Output:: 1A

Voltage - Supply:: 3.5V ~ 16V

Voltage - Load:: 3.5V ~ 16V

Operating Temperature:: -30°C ~ 90°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP-EP

AM4964GTR-G1 FAQ

1.How can I place an order for AM4964GTR-G1 through Aetrix?

Please submit a Request for Quotation (RFQ) for AM4964GTR-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 AM4964GTR-G1 reliable?

The price and inventory of AM4964GTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AM4964GTR-G1 is usually 5 days.

3.What payment methods are accepted for AM4964GTR-G1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AM4964GTR-G1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AM4964GTR-G1?

AM4964GTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AM4964GTR-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 AM4964GTR-G1?

For technical support, including AM4964GTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AM4964GTR-G1 requirements.

6.How does Aetrix verify that AM4964GTR-G1 is sourced from the original manufacturer or authorized distributors?

All AM4964GTR-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 AM4964GTR-G1 meets industry standards.

7.What is the process for return or replacement of AM4964GTR-G1?

All AM4964GTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AM4964GTR-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 AM4964GTR-G1 part is unused and in its original packaging.

Return procedure for AM4964GTR-G1:

1.Submit a request within 90 days.

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

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