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Texas Instruments UC3637Q
- Part No.:
- UC3637Q
- Manufacturer:
- Texas Instruments
- Category:
- Motor Drivers, Controllers
- Package:
- 20-LCC (J-Lead)
- Datasheet:
-
UC3637Q.pdf
- Description:
- IC MOTOR DRIVER 2.5V-20V 20PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,073
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Product details
Overview
UC3637Q from Texas Instruments is a monolithic PWM motor controller IC designed for bi-directional DC motor drive applications, featuring dual ±100mA source/sink output drivers, a sawtooth oscillator with ±10% frequency stability over temperature, pulse-by-pulse current limiting, and a 2.5V temperature-compensated shutdown threshold. It operates across 0°C to +70°C and supports ±2.5V to ±20V dual supply rails.
For engineers reviewing the UC3637Q datasheet, UC3637Q pinout, UC3637Q application, or UC3637Q equivalent, key selection considerations include its dual PWM comparator architecture, ±500mA pulsed output capability, deadtime-configurable modulation schemes, and compatibility with POWERFET or bipolar transistor gate driving in servo and motion control systems.
Technical Context
The UC3637Q integrates a voltage-controlled sawtooth oscillator whose frequency is set by external RT/CT components and stabilized via ±VTH inputs; oscillator accuracy is ±10% over 0°C to +70°C. Its error amplifier delivers 15 V/µs slew rate and 2 MHz unity-gain bandwidth, enabling fast closed-loop response in position/speed servo loops.
Two uncommitted PWM comparators accept externally summed error and offset signals to generate complementary, deadtime-adjustable pulse trains on Pins 4 (AOUT) and 7 (BOUT). The shutdown comparator references +VS and activates when the SHUTDOWN pin (Pin 15) falls >2.5V below +VS, forcing outputs low with temperature-stable hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 9–11 kHz typical; sets PWM carrier rate for motor commutation timing and EMI control. |
| Output Drive Capability | ±100mA continuous / ±500mA pulsed per output; directly drives POWERFET gates without external buffers. |
| Shutdown Threshold | 2.5V temperature-compensated reference relative to +VS; enables precise system-level fault shutdown coordination. |
| Current Limit Threshold | 200mV internal offset; supports accurate pulse-by-pulse overcurrent protection with external sense resistor. |
| Error Amplifier Slew Rate | 15 V/µs; ensures rapid correction of speed/position errors in dynamic servo loads. |
| Supply Voltage Range | ±2.5V to ±20V dual supply; accommodates wide-range industrial motor bus voltages and isolated bias supplies. |
| Operating Temperature | 0°C to +70°C; qualified for commercial-grade embedded motion control systems. |
Pinout & Package
UC3637Q is packaged in a 20-pin PLCC (FN package drawing), surface-mount, lead-free CU SN finish, moisture sensitivity level 2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VTH (Pin 1) | Oscillator upper threshold input | Sets maximum sawtooth amplitude; referenced to -VS to stabilize frequency vs. supply variation. |
| CT (Pin 2) | Oscillator timing capacitor connection | External capacitor determines oscillator frequency together with RT and +VTH/-VTH settings. |
| -VTH (Pin 3) | Oscillator lower threshold input | Sets minimum sawtooth amplitude; enables programmable duty cycle range and deadband control. |
| AOUT (Pin 4) | Output A driver | ±100mA source/sink PWM output for one half-bridge leg; compatible with N-channel or P-channel gate driving. |
| -VS (Pin 5) | Negative supply rail | Power return for internal circuitry and output stage; defines lower voltage boundary for analog and logic sections. |
| N/C (Pin 6) | No connect | Internally unused; must be left floating or tied to ground per layout best practices. |
| +VS (Pin 7) | Positive supply rail | Primary power for output drivers and internal bias; supports up to ±20V operation. |
| BOUT (Pin 8) | Output B driver | Complementary ±100mA PWM output for second half-bridge leg; used with AOUT for H-bridge motor control. |
| +BIN (Pin 9) | Comparator B non-inverting input | Accepts summed error and offset signal to configure deadtime or deadband mode for BOUT. |
| -BIN (Pin 10) | Comparator B inverting input | Reference input for B comparator; differential pair with +BIN enables noise-immune modulation control. |
| -AIN (Pin 11) | Comparator A inverting input | Reference input for A comparator; paired with +AIN to define null point and directionality of motor drive. |
| +AIN (Pin 12) | Comparator A non-inverting input | Primary error signal input path; accepts feedback-derived voltage proportional to position/speed error. |
| +C/L (Pin 13) | Current limit positive sense input | Connects to high-side current sense resistor; initiates latched shutdown on overcurrent events. |
| -C/L (Pin 14) | Current limit negative sense input | Differential input for current sensing; rejects common-mode noise from motor phase currents. |
| SHUTDOWN (Pin 15) | Enable/disable control input | Pulls down >2.5V below +VS to disable outputs; supports external fault interlocks and thermal shutdown circuits. |
| N/C (Pin 16) | No connect | Internally unused; no electrical function; leave unconnected. |
| +E/A (Pin 17) | Error amplifier output | Drives ±20mA into external compensation network; interfaces directly with +BIN/-BIN summing node. |
| -E/A (Pin 18) | Error amplifier inverting input | Inverting node for error amplifier; used with external feedback resistors to set loop gain and stability. |
| E/A OUTPUT (Pin 19) | Error amplifier output buffer | Low-impedance buffered output of error amp; provides drive strength for downstream comparator biasing. |
| ISET (Pin 20) | Oscillator charging current set | Current mirror input tied to +VTH; sets CT charging current to maintain constant oscillator frequency vs. supply. |
Key Features
| Feature | Design Value |
|---|---|
| Dual uncommitted PWM comparators | Enables flexible modulation schemes-zero deadtime, adjustable deadtime, or deadband-via external voltage offsets on Pins 9/11 and 10/12. |
| ±500mA pulsed output capability | Supports direct gate driving of discrete POWERFETs without external boost stages, reducing BOM count and layout complexity. |
| Pulse-by-pulse current limiting | Latched protection triggered by differential sense inputs (Pins 13/14); prevents destructive shoot-through during transient overload conditions. |
| Temperature-compensated 2.5V shutdown threshold | Ensures consistent fault response across 0°C to +70°C ambient; eliminates need for external voltage reference in safety-critical shutdown paths. |
| ±2.5V to ±20V dual-supply operation | Accommodates diverse motor bus architectures-from low-voltage robotics to industrial 48V DC systems-without level-shifting circuitry. |
Applications
| Industrial Servo Positioning System | Automated Guided Vehicle (AGV) Drive Control |
|---|---|
Use Scenario: Closed-loop positioning of linear actuators in CNC machinery using potentiometric or encoder feedback. IC Role / Device Role / Timing Role: PWM controller generating complementary drive signals for H-bridge MOSFETs, synchronized to error amplifier output and oscillator waveform. Use Value: Delivers 15 V/µs error correction and ±100mA gate drive to maintain sub-micron positioning accuracy under variable mechanical load. | Use Scenario: Bidirectional speed and torque control of traction motors in battery-powered warehouse AGVs. IC Role / Device Role / Timing Role: Core motor controller managing PWM duty cycle, current limiting, and thermal shutdown coordination across dual motor channels. Use Value: Enables efficient regenerative braking and smooth zero-speed holding via zero-deadtime modulation while protecting against battery overcurrent faults. |
| Lab Equipment Precision Pump Driver | Medical Infusion Pump Motor Interface |
Use Scenario: Micro-stepped peristaltic pump actuation in analytical instruments requiring repeatable fluid dosing at <1% flow error. IC Role / Device Role / Timing Role: Bi-directional PWM generator interfacing with op-amp-based current feedback loop and external current sense amplifier. Use Value: Provides stable 9–11 kHz carrier frequency and 200mV current limit threshold for precise, ripple-free microampere-level current regulation. | Use Scenario: Safety-critical DC motor control in Class II medical infusion pumps where motor stall detection and fault shutdown are mandated. IC Role / Device Role / Timing Role: Fault-aware motor driver implementing pulse-by-pulse current limiting, temperature-stable shutdown, and under-voltage lockout. Use Value: Guarantees immediate output disable within 100 ns of overcurrent event, meeting IEC 60601-1 essential performance requirements for life-support equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM motor controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3637DW | Same functional specification and electrical characteristics; SOIC-20 package instead of PLCC-20. | Preferred for automated SMT assembly and higher thermal dissipation in PCB-constrained designs. | Select UC3637DW when board space allows SOIC footprint and reflow compatibility is required. |
| UC2637Q | Identical pinout and architecture but rated for -25°C to +85°C industrial temperature range; oscillator accuracy ±10% same as UC3637Q. | Suitable for wider ambient environments including outdoor or unconditioned factory floors. | Choose UC2637Q only if extended temperature operation is mandatory and PLCC-20 packaging is acceptable. |
Compared with UC3637Q, UC3637DW offers identical functionality in a more manufacturable SOIC package with better thermal performance, while UC2637Q extends operating range at the cost of reduced reliability margin in commercial-grade applications.
Availability
UC3637Q is available at Aetrix Electronics and suitable for industrial servo positioning systems, automated guided vehicle (AGV) drive control, lab equipment precision pump drivers, and medical infusion pump motor interfaces requiring stable component supply and long-term lifecycle support.
Supply support for UC3637Q 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 consumer markets.
The UC3637Q belongs to TI's legacy PWM motor controller product line, engineered specifically for robust, cost-effective bi-directional DC motor drive in commercial-grade motion control applications.
FAQ
What is the operating temperature range specified for the UC3637Q?
The UC3637Q is characterized for operation from 0°C to +70°C. This commercial-grade temperature rating distinguishes it from the UC2637 (–25°C to +85°C) and UC1637 (–55°C to +125°C) variants. All electrical parameters in the datasheet-including oscillator accuracy, error amplifier offset, and output drive levels-are guaranteed within this range under specified test conditions. The UC3637Q uses the same die as other UCx637 family members but is binned and tested exclusively for the 0°C to +70°C window.
Does the UC3637Q support single-supply operation?
Yes, the UC3637Q supports single-supply operation with appropriate biasing. Although optimized for dual ±Vs supplies (±2.5V to ±20V), it can operate from a single rail by referencing –VS to ground and applying the full supply to +VS. In this configuration, analog inputs (e.g., +AIN, –AIN) must remain within –Vs+2V to +Vs–2V, and the error amplifier output swing is limited to 2V below +VS and 0.2V above ground. Designers must verify common-mode ranges and output headroom for their specific application.
How does the UC3637Q implement pulse-by-pulse current limiting?
The UC3637Q implements pulse-by-pulse current limiting using a dedicated differential amplifier with a fixed 200mV internal offset, connected to Pins 13 (+C/L) and 14 (–C/L). When the sensed voltage across an external current-sense resistor exceeds 200mV, the comparator triggers a latch that disables both AOUT and BOUT outputs for the remainder of that PWM cycle. This mechanism resets automatically each cycle, allowing continued operation after transient overloads while preventing cumulative thermal stress on power devices.
What is the purpose of the ISET pin (Pin 20) on the UC3637Q?
The ISET pin (Pin 20) on the UC3637Q serves as the current mirror input for the oscillator's charging current source. It is internally connected to the +VTH buffer output, ensuring the CT charging current scales proportionally with the oscillator's upper threshold voltage. This design maintains constant oscillator frequency despite variations in ±Vs supply rails-provided RT is referenced to –Vs as shown in the application diagram. ISET is not user-adjustable; its function is fully integrated and requires no external components.
Can the UC3637Q be used for stepper motor control?
The UC3637Q is not intended for direct stepper motor control. It is designed as a bi-directional PWM controller for brushed DC or voice-coil actuators-not for multi-phase excitation sequencing required by stepper motors. While its dual PWM outputs could theoretically drive one phase of a bipolar stepper, it lacks phase timing logic, microstepping capability, or current chopping control. For stepper applications, TI recommends dedicated drivers such as the DRV88xx or ULN2003 families. Using UC3637Q for stepper control would require significant external logic and is not supported by the device architecture or datasheet.
UC3637Q Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- Brushed DC
- Function:
- Controller - Commutation, Direction Management
- Output Configuration:
- Pre-Driver - Half Bridge (4)
- Interface:
- Parallel
- Technology:
- -
- Step Resolution:
- -
- Applications:
- General Purpose
- Current - Output:
- -
- Voltage - Supply:
- 2.5V ~ 20V
- Voltage - Load:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-PLCC (9x9)
UC3637Q FAQ
1.How can I place an order for UC3637Q through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3637Q 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 UC3637Q reliable?
The price and inventory of UC3637Q are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3637Q is usually 5 days.
3.What payment methods are accepted for UC3637Q?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3637Q transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3637Q?
UC3637Q orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3637Q 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 UC3637Q?
For technical support, including UC3637Q datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3637Q requirements.
6.How does Aetrix verify that UC3637Q is sourced from the original manufacturer or authorized distributors?
All UC3637Q 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 UC3637Q meets industry standards.
7.What is the process for return or replacement of UC3637Q?
All UC3637Q units undergo pre-shipment inspection (PSI). If there is an issue with UC3637Q, 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 UC3637Q part is unused and in its original packaging.
Return procedure for UC3637Q:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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