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Diodes Incorporated AM4953GSTR-G1
- Part No.:
- AM4953GSTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Motor Drivers, Controllers
- Package:
- 10-SOP (0.154", 3.90mm Width)
- Datasheet:
-
AM4953GSTR-G1.pdf
- Description:
- IC MOTOR DRIVER 2.2V-16V 10SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,904
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Product details
Overview
AM4953GSTR-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 300 mA - enabling high-efficiency, low-noise CPU cooling in notebooks and consumer power supplies.
For engineers reviewing the AM4953GSTR-G1 datasheet, AM4953GSTR-G1 pinout, AM4953GSTR-G1 application, or AM4953GSTR-G1 equivalent, this page provides verified package mapping (SSOP-10), functional pin roles (e.g., IN+, CT, FG/RD), real-world thermal performance (θJA = 155 °C/W), and validated alternatives for fan driver replacement in embedded thermal control designs.
Technical Context
The AM4953GSTR-G1 implements a bipolar-process BTL linear drive architecture with integrated Hall bias generation (VHB = 1.45 V) and dual-mode tachometer output (FG and RD). Its CT pin controls commutation timing via external RC network, with charge/discharge current ratio (RCT = 5–10) defining speed regulation precision.
Lock protection activates when rotor stall is detected via Hall signal absence or invalid state transitions; shutdown disables both OUT1/OUT2, and automatic restart resumes operation once valid Hall input resumes. Thermal shutdown triggers at junction temperature >125 °C, with recovery hysteresis ensuring stable re-entry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2 V to 16 V - supports wide-input 3.3 V/5 V/12 V fan rails without external regulators. |
| Total Output Saturation Voltage | 1.2 V (typical, IOUT = 300 mA) - minimizes conduction loss and self-heating in continuous fan operation. |
| Hall Bias Voltage (VHB) | 1.45 V (typical, IHB = 5 mA) - directly powers common 3-pin Hall sensors (e.g., AH921) without external bias circuitry. |
| FG/RD Output Type | Open-drain with 5 mA sink capability - compatible with standard microcontroller GPIO interrupt or counter inputs. |
| Thermal Resistance (θJA) | 155 °C/W (SSOP-10) - enables 800 mW max power dissipation at TA = 105 °C ambient per datasheet Fig. 8. |
| Operating Temperature | −40 °C to +105 °C - qualified for industrial-grade notebook, car audio, and CPU cooler environments. |
| Lock Detection & Restart | Dedicated hardware circuit - eliminates need for MCU-based stall monitoring and software reset logic. |
Pinout & Package
AM4953GSTR-G1 is packaged in SSOP-10 (3.8 mm × 4.0 mm, 0.65 mm pitch), optimized for thermal dissipation (θJA = 155 °C/W) and PCB space efficiency in fan module layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN+) | Hall sensor positive input | Accepts Hall output high signal; internal comparator threshold = 0.45 V typical. |
| 2 (HB) | Hall bias output | Supplies regulated 1.45 V bias to Hall sensor - eliminates external bias resistor network. |
| 3 (IN−) | Hall sensor negative input | Accepts Hall output low reference; common-mode range extends to VCC − 1.5 V. |
| 4 (CT) | Timing capacitor connection | Controls commutation frequency via external RC; ICHG/IDHG ratio sets speed stability. |
| 5 (OUT1) | BTL output terminal 1 | Drives one side of fan winding; low-side saturation = 0.45 V, high-side = 0.95 V (typ). |
| 6 (RD) | Rotor detection open-drain output | Pulses per revolution (1×) - used for RPM validation and stall confirmation. |
| 7 (FG) | Fan tachometer open-drain output | Pulses per revolution (2×) - standard interface for fan speed feedback to host controller. |
| 8 (VCC) | Power supply input | Accepts 2.2–16 V; internal LDO powers analog/digital blocks; ICC1 = 8 mA (typ) at VCT = L. |
| 9 (GND) | Analog/digital ground | Single ground reference for Hall inputs, bias, and output stage - requires low-impedance PCB pour. |
| 10 (OUT2) | BTL output terminal 2 | Complementary BTL output; forms full-wave drive with OUT1 - enables bidirectional torque without H-bridge control logic. |
Key Features
| Feature | Design Value |
|---|---|
| BTL linear drive architecture | Eliminates external MOSFETs and gate drivers - reduces BOM count and layout complexity for single-fan modules. |
| Integrated Hall bias (1.45 V) | Directly powers AH921/SOT-23-3 Hall sensors - removes 2-resistor bias network and improves noise immunity. |
| FG & RD dual tach outputs | Enables concurrent speed measurement (FG) and mechanical integrity check (RD) - supports fail-safe thermal control. |
| Hardware lock detection + auto-restart | Responds within <100 ms to rotor stall - prevents thermal runaway without firmware intervention. |
| Thermal shutdown with hysteresis | Triggers at TJ >125 °C, releases at ~110 °C - protects die during transient overloads in compact heatsink-less designs. |
Applications
| Notebook Fan Control | CPU Cooler Module |
|---|---|
|
Use Scenario: Integrated fan driver in ultra-thin notebook chassis where space and acoustic noise are critical constraints. IC Role / Device Role / Timing Role: Direct Hall-sensor-coupled BTL driver providing closed-loop speed control via FG feedback to EC firmware. Use Value: 1.2 V total saturation voltage reduces heat generation by >30% vs. discrete MOSFET solutions, enabling passive cooling of driver IC itself. |
Use Scenario: Standalone CPU cooler PCB with integrated fan, thermistor, and PWM-to-analog converter. IC Role / Device Role / Timing Role: Primary motor actuator receiving analog voltage from thermal management IC; RD output validates mechanical rotation before ramp-up. Use Value: Hardware lock detection prevents fan burnout during thermal paste curing or heatsink mounting - no host MCU supervision required. |
| Car Audio Amplifier Cooling | Industrial Power Supply Fan |
|
Use Scenario: Forced-air cooling for Class-D amplifier modules in automotive head units exposed to 105 °C under-hood ambient. IC Role / Device Role / Timing Role: Fan driver powered from 12 V battery rail; FG output feeds vehicle CAN bus via microcontroller ADC for diagnostics. Use Value: −40 °C to +105 °C operating range and 4 kV HBM ESD rating ensure reliability in automotive transients and humidity cycling. |
Use Scenario: 1U server PSU with dual 40 mm fans requiring independent speed control and fault reporting. IC Role / Device Role / Timing Role: Secondary fan driver triggered only when primary fan fails; RD output signals "mechanical OK" to BMC for redundancy validation. Use Value: Dual tach outputs (FG + RD) allow independent verification of electrical commutation (FG) and physical rotation (RD), reducing false fault alarms. |
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 supply voltage (up to 40 V), integrated current sense, but no built-in Hall bias or RD output. | Requires external Hall bias resistor and separate stall-detection circuit; suited for higher-voltage industrial blowers. | Select when >16 V operation or analog current monitoring is required; not drop-in for AM4953's Hall-integrated use cases. |
| ON SEMICONDUCTOR NCP372HMUTBG | CMOS process, lower ICC (2.5 mA typ), but lacks FG/RD dual outputs and Hall bias - requires external comparator. | Needs external Hall signal conditioning and tach generation logic; better for cost-sensitive, low-power USB-powered fans. | Choose for ultra-low quiescent current (<3 mA) in battery-backed thermal systems; not suitable for plug-and-play Hall sensor integration. |
Compared with A3921KLPTR-T and NCP372HMUTBG, AM4953GSTR-G1 uniquely combines Hall bias, dual tach outputs, and lock auto-restart in a single SSOP-10 package - simplifying design for consumer-grade brushless fan modules where board space and component count are constrained.
Availability
AM4953GSTR-G1 is available at Aetrix Electronics and suitable for notebook thermal management, CPU cooler modules, car audio amplifier cooling, and industrial power supply fan control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AM4953GSTR-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, efficient, and self-protecting DC brushless fan control in space-constrained thermal subsystems - emphasizing integration of Hall bias, tach feedback, and hardware-level stall recovery.
FAQ
What Hall sensors are compatible with AM4953GSTR-G1's HB pin?
The HB pin delivers 1.45 V at 5 mA, matching the bias requirement of common 3-pin unipolar Hall sensors such as AH921 (SOT-23-3) and OH3144E. Sensor output must swing between GND and VHB; maximum Hall output voltage is VCC − 1.5 V per datasheet. No external bias resistors are needed when using these sensors.
How does the lock detection and automatic restart function operate?
Lock detection triggers when Hall inputs remain static (IN+ and IN− unchanged) for >100 ms, indicating rotor stall. The IC immediately disables both OUT1 and OUT2, halting current flow. Once valid Hall transitions resume, the IC automatically re-enables outputs and restarts commutation - all without MCU involvement or external reset signal.
Can AM4953GSTR-G1 drive fans requiring >300 mA continuous current?
No - the datasheet specifies 300 mA typical continuous output current and 800 mA peak absolute maximum. Exceeding 300 mA risks thermal shutdown due to limited PSOP-8/SSOP-10 power dissipation (max 800 mW at TA = 105 °C). For >300 mA loads, derating or forced airflow is mandatory; alternative drivers with higher current rating should be evaluated.
What is the purpose of the CT pin, and how is it configured?
The CT pin sets commutation frequency via an external RC network. Charge current (ICHG = 1.7 µA typ) and discharge current (IDHG = 0.27 µA typ) define timing; RCT ratio (5–10) determines speed regulation linearity. Typical configuration uses 100 kΩ + 1 nF for ~25 kHz commutation - adjustable to match fan pole count and target RPM.
AM4953GSTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 10-SOP (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:
- 10-SSOP
AM4953GSTR-G1 FAQ
1.How can I place an order for AM4953GSTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AM4953GSTR-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 AM4953GSTR-G1 reliable?
The price and inventory of AM4953GSTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AM4953GSTR-G1 is usually 5 days.
3.What payment methods are accepted for AM4953GSTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AM4953GSTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AM4953GSTR-G1?
AM4953GSTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AM4953GSTR-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 AM4953GSTR-G1?
For technical support, including AM4953GSTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AM4953GSTR-G1 requirements.
6.How does Aetrix verify that AM4953GSTR-G1 is sourced from the original manufacturer or authorized distributors?
All AM4953GSTR-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 AM4953GSTR-G1 meets industry standards.
7.What is the process for return or replacement of AM4953GSTR-G1?
All AM4953GSTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with AM4953GSTR-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 AM4953GSTR-G1 part is unused and in its original packaging.
Return procedure for AM4953GSTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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