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Texas Instruments UC3717AQG3
- Part No.:
- UC3717AQG3
- Manufacturer:
- Texas Instruments
- Category:
- Full Half-Bridge (H Bridge) Drivers
- Package:
- 20-LCC (J-Lead)
- Datasheet:
-
UC3717AQG3.pdf
- Description:
- IC HALF BRIDGE DRIVER 1A 20PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,629
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Product details
Overview
UC3717AQG3 from Texas Instruments is a bipolar stepper motor driver IC with H-bridge output stage, supporting full-step, half-step, and micro-step operation. It delivers ±1.2A peak output current, operates from 10V to 46V motor supply, features integrated bootstrap pull-up for reduced recirculation saturation voltage (1.1–1.35V at –0.5A), and includes thermal shutdown at +160°C to +180°C. It is used in precision motion control systems such as industrial automation actuators and CNC positioning stages.
For engineers reviewing the UC3717AQG3 datasheet, UC3717AQG3 pinout, UC3717AQG3 application, or UC3717AQG3 equivalent, key selection criteria include its fixed off-time current regulation architecture, dual-bit D/A selectable current thresholds (100%/60%/19%), LS-TTL-compatible logic inputs, and built-in fast-recovery commutating diodes - all critical for chopper-driven bipolar stepper motor designs requiring stable current limiting and thermal resilience.
Technical Context
The UC3717AQG3 implements a fixed off-time chopper control algorithm using an internal monostable, two-bit D/A threshold selection, and analog current sensing via external sense resistor and RC filter. Its H-bridge output stage integrates four Darlington transistors with built-in commutating diodes and bootstrap pull-up circuitry to lower source transistor saturation voltage during recirculation.
Phase polarity logic provides noise-immune bidirectional winding current control with hysteresis; thermal protection reduces winding current before junction temperature exceeds +180°C. The device is characterized for 0°C to +70°C ambient operation and requires external timing components (RT/CT) to set off-time per TOFF = 0.69·RT·CT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±1.2A peak - supports bipolar stepper windings up to 1A RMS without external heatsinking |
| Motor Supply Range | 10V to 46V - enables overvoltage drive for faster step response in high-inductance motors |
| Logic Supply Voltage | 4.75V to 5.25V - compatible with standard 5V TTL/LS-CMOS control logic |
| Current Threshold Options | 100%, 60%, 19%, or inhibit - selected by IO/I1 pins for discrete current scaling or microstepping reference adjustment |
| Saturation Voltage (Recirc) | 1.1–1.35V at –0.5A - reduced by integrated bootstrap, lowering power loss during current decay |
| Thermal Shutdown Threshold | +160°C to +180°C - soft intervention limits junction temperature without abrupt shutdown |
| Input Logic Compatibility | LS-TTL - accepts 0.8V low / 2V high thresholds, enabling direct interface with legacy controllers |
Pinout & Package
UC3717AQG3 is packaged in a 16-pin PDIP (N package), with GND pins (4, 5, 12, 13) thermally connected to PCB copper for improved θJA. Pin 2 is timing input for RT/CT network; Pins 1 and 15 are H-bridge outputs (AOUT/BOUT); Pin 10 is analog current sense input; Pin 11 is reference voltage input for microstepping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | H-bridge Output (AOUT/BOUT) | Drive motor winding terminals; support ±1.2A peak with integrated commutating diodes |
| 2 | Timing Input | Connects to RT/CT network to set fixed off-time (TOFF = 0.69·RT·CT) |
| 3, 14 | Motor Supply (Vm) | High-side power rail input (10–46V); decoupled externally for switching stability |
| 4, 5, 12, 13 | GND | Power and signal ground; multiple pins reduce impedance and improve thermal conduction |
| 6 | VCC (Logic Supply) | 5V ±5% logic rail; powers internal logic, comparators, and monostable |
| 7, 8, 9 | Logic Inputs (Phase, I0, I1) | LS-TTL-compatible phase direction and current level select; hysteresis prevents noise-induced missteps |
| 10 | Current Sense Input | Analog input for filtered sense resistor voltage; compared against D/A-selected thresholds |
| 11 | Reference Voltage (VR) | Adjusts current threshold continuously for microstepping; typically 5V |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Bootstrap Pull-Up | Lowers source transistor VSAT during recirculation by ~0.6V, reducing power dissipation at 0.5A |
| Built-In Fast Recovery Diodes | Eliminates need for external flyback diodes; enables clean current decay paths in H-bridge |
| Fixed Off-Time Chopper Control | Enables predictable ripple frequency (~1/(1.5·TOFF)) independent of motor L/R time constant |
| Dual-Bit D/A Current Selection | Three discrete current levels (100%/60%/19%) plus inhibit - simplifies step torque profiling |
| Thermal Protection with Soft Intervention | Gradually reduces winding current above +160°C instead of hard shutdown - maintains positional integrity |
Applications
| Industrial CNC Positioning | Medical Infusion Pump Actuation |
|---|---|
Use Scenario: Precise open-loop positioning of X/Y axes in benchtop CNC mills using 1.8° hybrid stepper motors. IC Role / Device Role / Timing Role: UC3717AQG3 acts as chopper-controlled H-bridge driver, regulating winding current to maintain torque across variable step rates up to 20 kHz. Use Value: Fixed off-time control ensures consistent microstep resolution; integrated diodes eliminate layout-sensitive external components. | Use Scenario: Bidirectional syringe plunger control in programmable IV infusion pumps requiring smooth, low-vibration motion. IC Role / Device Role / Timing Role: UC3717AQG3 provides half-stepping capability with VR-adjusted current boost on single-phase energization to compensate torque drop. Use Value: Thermal soft-shutdown prevents pump stall during extended duty cycles; LS-TTL compatibility enables direct interface with microcontroller GPIOs. |
| Automated Lab Equipment Stage | Printed Circuit Board Router |
Use Scenario: High-accuracy Z-axis focus adjustment in automated optical inspection systems with permanent magnet stepper motors. IC Role / Device Role / Timing Role: UC3717AQG3 executes full-step sequencing with phase polarity logic and current limiting to avoid resonance-induced missed steps. Use Value: Noise-immune phase input hysteresis prevents false triggering from EMI near imaging sensors; 46V Vm supports high-overdrive for rapid settling. | Use Scenario: XY gantry movement in desktop PCB milling machines where compact size and thermal reliability are critical. IC Role / Device Role / Timing Role: UC3717AQG3 drives bipolar windings with integrated bootstrap to sustain 1A peak under continuous 30% duty cycle without external heatsink. Use Value: Multiple GND pins and PDIP thermal design allow soldering to 25 mm² copper pour for θJA reduction - essential in enclosed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar stepper motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TB6600HG | Higher voltage rating (50V), 4.5A peak output, but requires external diodes and separate logic supply | Targeted at higher-power industrial motors; lacks integrated bootstrap and thermal soft-shutdown | Choose TB6600HG only when >2A winding current or >46V supply is required; additional BOM and layout complexity applies |
| LV8729V | Microstepping up to 32x, integrated current DAC, but max 1.2A RMS (not peak), no bootstrap circuit | Optimized for quiet, vibration-free motion in consumer robotics; lower thermal robustness (TJ max +150°C) | Select LV8729V for audio-sensitive environments needing fine microstepping; UC3717AQG3 preferred for rugged industrial duty cycles |
Compared with TB6600HG and LV8729V, UC3717AQG3 uniquely combines integrated bootstrap, soft thermal intervention, and LS-TTL compatibility in a PDIP package - making it optimal for cost-sensitive, thermally constrained, legacy-controller-based stepper systems requiring reliable 1A peak drive without external diode or gate-drive components.
Availability
UC3717AQG3 is available at Aetrix Electronics and suitable for industrial CNC positioning, medical infusion pump actuation, and automated lab equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant through-hole packaging.
Supply support for UC3717AQG3 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The UC3717AQG3 belongs to TI's legacy motor driver product line, designed specifically for cost-effective, discrete-component-based chopper drives targeting bipolar stepper motors in industrial control and instrumentation applications.
FAQ
What is the maximum motor supply voltage supported by UC3717AQG3?
The UC3717AQG3 supports a motor supply voltage range of 10V to 46V, with absolute maximum rating at 50V on pins 3 and 14. Operation above 46V risks exceeding safe operating area limits and may trigger thermal protection prematurely. For reliable long-term use, keep Vm ≤ 46V as specified in electrical characteristics.
Does UC3717AQG3 require external flyback diodes?
No, UC3717AQG3 does not require external flyback diodes because it integrates fast-recovery commutating diodes within its H-bridge output stage. These diodes provide the necessary recirculation path during current decay, eliminating layout sensitivity and reducing BOM count - confirmed in the functional description and block diagram.
How does UC3717AQG3 implement microstepping?
UC3717AQG3 enables microstepping by accepting a continuously adjustable reference voltage (VR) on pin 11, which scales the current threshold used in its fixed off-time chopper algorithm. Combined with discrete current level selection via IO/I1 pins, this allows interpolation between full/half/micro-steps - as described in the "Half-Stepping" section and Table 1 of the datasheet.
What is the purpose of the bootstrap circuit in UC3717AQG3?
The bootstrap circuit in UC3717AQG3 pulls up the base of the source transistor during recirculation, lowering its saturation voltage by ~0.6V (e.g., from 1.7V to 1.1V at –0.5A). This directly reduces conduction losses and improves efficiency - a key differentiator from earlier UC3717 versions, explicitly documented in the "DESCRIPTION" and "OUTPUT STAGE" sections.
Can UC3717AQG3 be used with 3.3V logic controllers?
No, UC3717AQG3 is not compatible with 3.3V logic controllers because its logic inputs (pins 7, 8, 9) require LS-TTL thresholds: input high must be ≥2V and input low ≤0.8V, with VCC fixed at 4.75–5.25V. Driving it from 3.3V logic risks undefined state or failure to register high-level commands - a limitation confirmed in Absolute Maximum Ratings and Electrical Characteristics tables.
UC3717AQG3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Half Bridge (2)
- Applications:
- General Purpose, Stepper Motors
- Interface:
- Logic
- Load Type:
- Inductive
- Technology:
- Bipolar
- Rds On (Typ):
- -
- Current - Output / Channel:
- 1A
- Current - Peak Output:
- -
- Voltage - Supply:
- 4.75V ~ 5.25V
- Voltage - Load:
- 10V ~ 46V
- Operating Temperature:
- 0°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Features:
- Bootstrap Circuit
- Fault Protection:
- Over Temperature
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-PLCC (9x9)
UC3717AQG3 FAQ
1.How can I place an order for UC3717AQG3 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3717AQG3 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 UC3717AQG3 reliable?
The price and inventory of UC3717AQG3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3717AQG3 is usually 5 days.
3.What payment methods are accepted for UC3717AQG3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3717AQG3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3717AQG3?
UC3717AQG3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3717AQG3 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 UC3717AQG3?
For technical support, including UC3717AQG3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3717AQG3 requirements.
6.How does Aetrix verify that UC3717AQG3 is sourced from the original manufacturer or authorized distributors?
All UC3717AQG3 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 UC3717AQG3 meets industry standards.
7.What is the process for return or replacement of UC3717AQG3?
All UC3717AQG3 units undergo pre-shipment inspection (PSI). If there is an issue with UC3717AQG3, 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 UC3717AQG3 part is unused and in its original packaging.
Return procedure for UC3717AQG3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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