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Texas Instruments UC3717AQ
- Part No.:
- UC3717AQ
- Manufacturer:
- Texas Instruments
- Category:
- Full Half-Bridge (H Bridge) Drivers
- Package:
- 20-LCC (J-Lead)
- Datasheet:
-
UC3717AQ.pdf
- Description:
- IC HALF BRIDGE DRIVER 1A 20PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,509
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Product details
Overview
UC3717AQ from Texas Instruments is a bipolar stepper motor driver IC implementing fixed off-time chopper control with integrated bootstrap circuitry, ±1.2A H-bridge output current, 10–46V motor supply range, and thermal shutdown at +160°C to +180°C. It supports full-step, half-step, and micro-step operation in LS-TTL or microprocessor-controlled motion systems.
For engineers reviewing the UC3717AQ datasheet, UC3717AQ pinout, UC3717AQ application, or UC3717AQ equivalent, key selection criteria include its PLCC-20 package, dual-bit current level selection (100%/60%/19%/inhibit), built-in fast recovery commutating diodes, recirculation-mode saturation voltage of 1.1–1.35V at −0.5A, and compatibility with external sense resistor-based current regulation.
Technical Context
The UC3717AQ integrates an H-bridge output stage with four Darlington transistors and internal commutating diodes, coupled with phase polarity logic and a two-bit D/A current select network that sets one of three comparator thresholds (66–90mV, 236–266mV, 396–436mV) for peak winding current control. Its monostable generates a fixed off-time (25–35µs with RT=56kΩ/CT=820pF) to regulate current ripple during switched-mode operation.
Thermal protection operates via a dedicated shutdown network limiting junction temperature to ≤180°C with soft intervention, while integrated bootstrap pull-up reduces source transistor saturation voltage during recirculation-lowering power dissipation by up to 0.6V compared to non-bootstrapped operation at −0.5A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±1.2A continuous - supports bipolar stepper windings requiring up to 1A RMS current |
| Motor Supply Voltage | 10–46V - enables direct interface with industrial 24V/36V/48V DC bus systems |
| Logic Supply Voltage | 4.75–5.25V - compatible with standard 5V TTL/LS logic without level-shifting |
| Current Sense Thresholds | 66–90mV / 236–266mV / 396–436mV - selectable via I0/I1 pins for discrete current levels or microstepping |
| Fixed Off-Time | 25–35µs - determines current ripple magnitude and effective chopper frequency (~14–20kHz nominal) |
| Thermal Shutdown | +160°C to +180°C - activates gradual current reduction before hard latch-off, preserving motor control integrity |
| Saturation Voltage (Recirc) | 1.1–1.35V at −0.5A - low conduction loss during energy recirculation improves efficiency and thermal margin |
Pinout & Package
UC3717AQ is housed in a 20-pin PLCC (Q package, drawing FN), surface-mount, lead-free (CU SN), moisture sensitivity level 2 (260°C, 1 year), with exposed thermal pad connected to GND pins (4, 5, 12, 13, 14, 16, 17, 20).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | H-bridge output terminals (BOUT, AOUT) | Drive complementary ends of one motor winding; rated for ±1.2A, 46V max |
| 2 | Timing input | Connects to RC network (RT/CT) setting fixed off-time; TOFF = 0.69·RT·CT |
| 3, 14, 17, 18 | Motor supply (Vm) | High-side power rails for H-bridge; decoupling required near pins |
| 4, 5, 12, 13, 14, 16, 20 | GND | Multiple ground connections - must be tied to large copper pour for thermal management |
| 6 | VCC (logic supply) | 5V logic rail; supplies internal logic, comparators, and monostable (7–15mA typical ICC) |
| 7, 8, 9 | Logic inputs (I1, Phase, I0) | TTL-compatible control: Phase sets winding polarity; I0/I1 select current level (Table 1) |
| 10 | Analog input (current sense) | Accepts filtered voltage from external sense resistor; compared against selected threshold |
| 11 | Reference input (VR) | Adjusts comparator thresholds continuously - enables analog microstepping control |
| 19 | Emitters | Internal emitter nodes of sink transistors - not user-accessible; internal connection only |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bootstrap pull-up | Reduces source transistor VSAT by ~0.6V during recirculation, lowering power loss and die temperature rise |
| Built-in fast recovery commutating diodes | Eliminates need for 4 external flyback diodes; enables compact layout and reduces BOM count |
| Three discrete current levels + inhibit | Configurable via I0/I1 pins (100%/60%/19%/off) - supports torque-matched full/half-step sequencing |
| Soft thermal intervention | Gradual current reduction above +160°C avoids abrupt motor stall; maintains position integrity during overload |
| Fixed off-time chopper algorithm | Deterministic current ripple control independent of winding L/R - simplifies loop stability vs. current-mode PWM |
Applications
| Industrial CNC Positioning | Medical Infusion Pump Drive |
|---|---|
Use Scenario: Precision open-loop positioning of X/Y stages in benchtop CNC mills using 1.8° hybrid stepper motors. IC Role / Device Role / Timing Role: UC3717AQ acts as the winding current controller and H-bridge driver, executing microstepped current profiles under microcontroller command. Use Value: Fixed off-time regulation ensures consistent step accuracy across 10–46V supply variations; integrated diodes reduce PCB area by 24 mm² vs. discrete solution. | Use Scenario: Low-noise, low-vibration motor drive for syringe-based infusion pumps requiring smooth 1/8-step motion. IC Role / Device Role / Timing Role: UC3717AQ regulates peak winding current via VR-adjusted thresholds to achieve analog microstepping resolution. Use Value: Soft thermal intervention prevents sudden flow interruption during extended duty cycles; ±1.2A rating supports high-torque 28mm frame motors. |
| Automated Test Equipment (ATE) | Lab Automation Robotic Arm |
Use Scenario: High-speed indexing of probe card positioners in semiconductor wafer testers, operating at >500 steps/sec. IC Role / Device Role / Timing Role: UC3717AQ delivers rapid current reversal via phase polarity control and low VSAT recirculation path. Use Value: 1.1–1.35V recirculation saturation voltage minimizes heat generation at high chopper frequencies (~18kHz), enabling sustained 1A peak current. | Use Scenario: Multi-axis joint actuation in compact educational robotic arms using NEMA 17 bipolar steppers. IC Role / Device Role / Timing Role: UC3717AQ implements half-stepping with torque compensation via VR boost on single-phase energization. Use Value: Dual-bit current selection (I0/I1) eliminates external logic for sequence control; PLCC-20 footprint allows dense 2-axis board layout. |
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 4.5A output, external MOSFET H-bridge, no integrated bootstrap or commutating diodes | Requires 8 external diodes and gate drivers; suited for >2A motors but larger BOM and layout | Select when motor current exceeds 1.2A or when discrete power stage tuning is required |
| DRV8811 | Integrated current DAC, SPI interface, 1.5A rating, no bootstrap, higher VSAT (1.8V recirc @ 1A) | Digital control only; lacks analog VR microstepping input and TTL-compatible logic inputs | Select for microcontroller-based systems needing register-configurable current and fault reporting |
Compared with TB6600HG and DRV8811, UC3717AQ offers unique analog microstepping via VR input, TTL-native control, and lowest recirculation losses among PLCC-packaged alternatives - making it optimal for cost-sensitive, space-constrained 1A-class industrial motion designs where analog interface and thermal soft-fail behavior are critical.
Availability
UC3717AQ is available at Aetrix Electronics and suitable for industrial CNC positioning, medical infusion pump drive, automated test equipment (ATE), lab automation robotic arm, and precision motion control applications requiring stable component supply and long-term lifecycle support.
Supply support for UC3717AQ 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, embedded processing, and logic solutions for industrial, automotive, and personal electronics markets.
The UC3717AQ belongs to TI's legacy motor driver product line, designed specifically for cost-effective, integrated chopper-drive solutions in bipolar stepper systems requiring analog microstepping, thermal resilience, and minimal external components.
FAQ
What is the maximum motor supply voltage supported by UC3717AQ?
The UC3717AQ supports a motor supply voltage (Vm) range of 10V to 46V, with absolute maximum rating at 50V. Operation beyond 46V risks exceeding safe SOA limits during transient conditions. The 46V upper limit ensures reliable performance across temperature and process variation while maintaining adequate margin for 48V nominal industrial rails.
Does UC3717AQ require external flyback diodes?
No, UC3717AQ does not require external flyback diodes. It integrates fast recovery commutating diodes within the H-bridge output stage - confirmed in the Functional Description section and "Built-In Fast Recovery Commutating Diodes" feature list. This eliminates four discrete diodes, reducing board area and BOM cost.
How does UC3717AQ implement microstepping?
UC3717AQ implements microstepping through its VR (pin 11) reference input, which continuously adjusts the comparator thresholds used for current sensing. When combined with external RC filtering on pin 10 and proper timing, this enables analog interpolation between the three discrete current levels set by I0/I1 - allowing smooth 1/4-, 1/8-, or finer microstep resolution without digital control overhead.
What is the thermal shutdown behavior of UC3717AQ?
UC3717AQ features thermal protection with soft intervention: when junction temperature reaches +160°C to +180°C, it gradually reduces winding current rather than latching off. This preserves motor position and avoids abrupt system failure - critical in open-loop motion applications where stall detection is unavailable. The shutdown network resets automatically upon cooling.
Can UC3717AQ operate with 3.3V logic inputs?
No, UC3717AQ cannot reliably operate with 3.3V logic inputs. Its logic inputs (pins 7, 8, 9) require TTL-compatible thresholds: input high voltage ≥2V (up to VCC) and input low voltage ≤0.8V. With VCC = 5V, a 3.3V signal falls below the guaranteed VIH minimum and may cause erratic phase or current-level switching. A level shifter or 5V logic interface is required.
UC3717AQ 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)
UC3717AQ FAQ
1.How can I place an order for UC3717AQ through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3717AQ 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 UC3717AQ reliable?
The price and inventory of UC3717AQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3717AQ is usually 5 days.
3.What payment methods are accepted for UC3717AQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3717AQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3717AQ?
UC3717AQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3717AQ 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 UC3717AQ?
For technical support, including UC3717AQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3717AQ requirements.
6.How does Aetrix verify that UC3717AQ is sourced from the original manufacturer or authorized distributors?
All UC3717AQ 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 UC3717AQ meets industry standards.
7.What is the process for return or replacement of UC3717AQ?
All UC3717AQ units undergo pre-shipment inspection (PSI). If there is an issue with UC3717AQ, 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 UC3717AQ part is unused and in its original packaging.
Return procedure for UC3717AQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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