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Texas Instruments UC2637DWG4
- Part No.:
- UC2637DWG4
- Manufacturer:
- Texas Instruments
- Category:
- Motor Drivers, Controllers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UC2637DWG4.pdf
- Description:
- IC MOTOR DRIVER 2.5V-20V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,009
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Product details
Overview
UC2637DWG4 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, an integrated sawtooth oscillator (±5% initial accuracy), error amplifier (15 V/µs slew rate), and pulse-by-pulse current limiting. It operates across -25°C to +85°C and supports ±2.5V to ±20V dual supply rails.
For engineers reviewing the UC2637DWG4 datasheet, UC2637DWG4 pinout, UC2637DWG4 application, or UC2637DWG4 equivalent, key selection considerations include its 20-pin SOIC package, temperature-compensated 2.5V shutdown threshold, under-voltage lockout (4.15–5.0V start), and uncommitted PWM comparators enabling flexible modulation schemes including zero-deadtime and deadband operation.
Technical Context
The UC2637DWG4 implements a fixed-frequency PWM architecture using an externally programmable sawtooth oscillator (RT/CT-based), where oscillator frequency stability is maintained via proportional scaling of charging current with supply voltage when RT is referenced to -VS. Its dual PWM comparators accept arbitrary analog inputs at Pins 9/11 (+BIN/-BIN) and 10/12 (-AIN/+AIN), allowing polarity-sensitive duty-cycle control of outputs AOUT (Pin 4) and BOUT (Pin 7).
Protection logic includes latched pulse-by-pulse current limiting (200 mV offset, ±2.5V to ±20V common-mode range), temperature-stabilized shutdown comparator (2.5V threshold relative to +VS), and under-voltage lockout that forces outputs low until +VS reaches ≥4.15V. The error amplifier delivers ±20mA output current with 75–100 dB CMRR and PSRR, supporting closed-loop servo positioning in industrial motion systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency Accuracy | ±5% initial (±10% over -25°C to +85°C); enables stable PWM timing without external crystal. |
| Output Drive Capability | ±100mA continuous / ±500mA pulsed per output (Pins 4 & 7); directly drives power FET gates or bipolar transistor bases. |
| Error Amplifier Slew Rate | 15 V/µs; supports fast transient response in position/speed servo loops with <1 µs settling. |
| Shutdown Threshold | 2.5V temperature-compensated threshold referenced to +VS (Pin 6); enables precise, drift-free enable/disable control. |
| Supply Voltage Range | ±2.5V to ±20V dual supply; accommodates wide-range motor bus voltages while maintaining analog signal integrity. |
| Current Limit Offset | 200 mV typical input offset with -0.2 mV/°C T.C.; ensures consistent overcurrent trip point across operating temperature. |
| Under-Voltage Lockout | 4.15–5.0V start threshold with 0.25V hysteresis; prevents erratic startup during brownout conditions. |
Pinout & Package
UC2637DWG4 is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-2-260°C-1 year.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VTH (Pin 1) | Oscillator upper threshold reference | Sets peak voltage of internal sawtooth waveform; buffered to ISET (Pin 20) to scale oscillator charging current. |
| CT (Pin 2) | Oscillator timing capacitor connection | External capacitor (e.g., 1500 pF) sets oscillator frequency together with RT; determines PWM carrier period. |
| -VTH (Pin 3) | Oscillator lower threshold reference | Sets valley voltage of sawtooth; differential between +VTH and -VTH defines amplitude and linearity. |
| AOUT (Pin 4) | Output A driver | ±100mA source/sink PWM output for one half-bridge leg; logic-level compatible with discrete or integrated power stages. |
| -VS (Pin 5) | Negative supply rail | Reference for all negative-side circuitry; must be connected to system ground or negative bus in dual-supply configurations. |
| N/C (Pin 6) | No-connect | Internally unused; must remain floating or grounded per layout guidelines to avoid noise coupling. |
| +VS (Pin 7) | Positive supply rail | Power rail for positive-side circuitry and output high-level swing; defines upper limit of analog input and output ranges. |
| BOUT (Pin 8) | Output B driver | Independent ±100mA source/sink PWM output for second half-bridge leg; enables H-bridge or dual-unidirectional drive. |
| +BIN (Pin 9) | Comparator B non-inverting input | Accepts bias/reference voltage to set deadtime or deadband window for BOUT modulation. |
| -BIN (Pin 10) | Comparator B inverting input | Receives error signal or feedback for BOUT duty-cycle control; polarity determines direction of motor rotation. |
| -AIN (Pin 11) | Comparator A inverting input | Primary error signal input for AOUT; inverted polarity relative to +AIN allows differential error amplification. |
| +AIN (Pin 12) | Comparator A non-inverting input | Reference or summed feedback input; used with -AIN to configure servo loop gain and null point. |
| +C/L (Pin 13) | Current limit positive sense input | Connects to high-side current sense resistor; 200 mV threshold triggers latched shutdown on overcurrent. |
| -C/L (Pin 14) | Current limit negative sense input | Completes differential current sense path; rejects common-mode noise up to ±20V. |
| SHUTDOWN (Pin 15) | Enable/disable control input | Pulling >2.5V below +VS disables outputs; used for fault recovery, thermal shutdown, or system-level sequencing. |
| N/C (Pin 16) | No-connect | Unused terminal; leave unconnected per TI design recommendations. |
| +E/A (Pin 17) | Error amplifier output | Drives ±20mA into external compensation network; interfaces directly with PWM comparator inputs (Pins 9–12). |
| -E/A (Pin 18) | Error amplifier inverting input | Inverts and sums feedback signals; configured with external resistors for PID or lead-lag compensation. |
| E/A OUTPUT (Pin 19) | Error amplifier non-inverting input | Accepts reference or command signal; establishes servo setpoint or speed target voltage. |
| ISET (Pin 20) | Oscillator current set | Internally biased by +VTH; sets CT charging current to maintain constant frequency vs. supply variation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PWM outputs | Enables full H-bridge control or dual-motor drive from single IC; eliminates need for two separate controllers. |
| Temperature-compensated shutdown | 2.5V threshold with <±10 mV drift over -25°C to +85°C ensures reliable fault response without external calibration. |
| Uncommitted comparator inputs | Pins 9–12 accept arbitrary analog signals, supporting custom modulation schemes (zero-deadtime, deadband, asymmetric drive). |
| Pulse-by-pulse current limiting | Latched protection resets only on next oscillator cycle, preventing shoot-through while preserving dynamic response. |
| Wide supply range (±2.5V to ±20V) | Supports 5V logic-level systems up to 40V motor buses without level-shifting, reducing BOM count and layout complexity. |
Applications
| Industrial Servo Positioning | DC Motor Speed Control |
|---|---|
Use Scenario: Closed-loop positioning of CNC axes using potentiometric or encoder feedback. IC Role / Device Role / Timing Role: UC2637DWG4 serves as the PWM modulator and error amplifier, converting position error into complementary PWM signals for H-bridge drive. Use Value: 15 V/µs slew rate and 2 MHz unity-gain bandwidth enable sub-millisecond servo response; ±100mA outputs directly drive gate drivers without buffering. | Use Scenario: Variable-speed fan or pump control in HVAC systems with analog 0–10V setpoint input. IC Role / Device Role / Timing Role: UC2637DWG4 acts as the analog PWM generator, accepting voltage command and generating duty-cycle-modulated outputs for bi-directional motor control. Use Value: ±5% oscillator accuracy ensures stable speed regulation; under-voltage lockout prevents erratic behavior during AC line dips. |
| Robotics Joint Actuation | Lab Equipment Motion Control |
Use Scenario: Torque-controlled elbow/wrist joints in collaborative robots requiring smooth bidirectional motion. IC Role / Device Role / Timing Role: UC2637DWG4 provides zero-deadtime PWM modulation (via equal +BIN/-BIN bias) to maximize holding torque and mechanical stiffness. Use Value: Dual ±500mA pulsed outputs ensure rapid MOSFET switching; current-limit hysteresis prevents nuisance tripping during transient load spikes. | Use Scenario: Precision XY stage movement in optical microscopes or semiconductor inspection tools. IC Role / Device Role / Timing Role: UC2637DWG4 functions as the servo loop modulator, interfacing with DAC-generated reference and encoder-derived feedback. Use Value: 75–100 dB PSRR suppresses supply noise from shared digital rails; ±2.5V to ±20V supply range accommodates both low-voltage logic and high-torque motor drivers. |
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 | Commercial temperature range (0°C to +70°C); identical pinout, electrical specs, and functional block diagram. | Targeted for non-industrial environments (office equipment, consumer devices) with less stringent thermal requirements. | Select UC3637DW only if ambient operating temperature remains within 0–70°C and military-grade reliability is not required. |
| TLE5206-2G | Integrated high-side/low-side drivers (600 mA), built-in diagnostics, CAN interface; requires external oscillator; no uncommitted comparators. | Designed for automotive body electronics (e.g., seat/mirror control); includes watchdog, overtemperature, and short-circuit reporting. | Choose TLE5206-2G when automotive qualification (AEC-Q100), embedded diagnostics, or higher drive current are mandatory - not for general-purpose servo designs. |
Compared with UC3637DW, UC2637DWG4 offers extended temperature operation (-25°C to +85°C) critical for industrial enclosures; versus TLE5206-2G, it provides greater analog design flexibility via uncommitted comparators and external oscillator tuning, at the cost of integrated protection features.
Availability
UC2637DWG4 is available at Aetrix Electronics and suitable for industrial servo positioning, robotics joint actuation, DC motor speed control, and lab equipment motion control requiring stable component supply across extended temperature ranges.
Supply support for UC2637DWG4 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 silicon technologies for industrial, automotive, and communications markets.
The UCx637 family-including UC2637DWG4-is engineered as a robust, analog-intensive PWM motor controller product line targeting precision motion control in harsh industrial environments where reliability, thermal stability, and design flexibility are paramount.
FAQ
What is the maximum allowable supply voltage for UC2637DWG4?
The UC2637DWG4 supports ±2.5V to ±20V dual supply rails, meaning the absolute maximum differential voltage between +VS (Pin 7) and -VS (Pin 5) is 40V. Exceeding ±20V risks permanent damage to internal ESD structures and analog circuitry. Operation at ±15V is typical for industrial motor drive applications, providing headroom for transients while maintaining optimal error amplifier common-mode range.
Does UC2637DWG4 require external components to operate as a complete PWM motor controller?
Yes, UC2637DWG4 requires external components to function: RT and CT (e.g., 16.7 kΩ and 1500 pF) set oscillator frequency; current-sense resistors connect to +C/L (Pin 13) and -C/L (Pin 14); feedback and reference networks attach to +AIN (Pin 12), -AIN (Pin 11), +BIN (Pin 9), and -BIN (Pin 10); and output drivers interface with external power FETs or gate drivers. No internal oscillator crystal or EEPROM is included.
How does the shutdown feature of UC2637DWG4 behave during fault conditions?
When the SHUTDOWN pin (Pin 15) is pulled more than 2.5V below +VS (Pin 7), UC2637DWG4 immediately forces both AOUT (Pin 4) and BOUT (Pin 7) to low-impedance low state and disables internal oscillator and error amplifier outputs. The shutdown is latched per pulse-by-pulse cycle but resets automatically each oscillator period-enabling rapid recovery after transient overcurrent events without requiring system reset.
Can UC2637DWG4 generate complementary PWM signals with adjustable deadtime?
Yes, UC2637DWG4 supports adjustable deadtime via differential biasing of +BIN (Pin 9) and -BIN (Pin 10). When +BIN voltage exceeds -BIN, a controlled delay is introduced between AOUT and BOUT transitions, preventing shoot-through in H-bridge configurations. The magnitude of voltage difference directly scales deadtime duration, enabling fine-grained optimization for specific power FET switching characteristics.
What is the purpose of the ISET pin (Pin 20) on UC2637DWG4?
The ISET pin (Pin 20) receives internally buffered +VTH (Pin 1) voltage to establish the oscillator's capacitor charging current. By referencing RT to -VS (Pin 5), the charging current-and thus oscillator frequency-remains stable over supply voltage variations. This eliminates frequency drift in systems with unregulated or noisy supplies, ensuring consistent PWM carrier timing critical for servo stability and EMI control.
UC2637DWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
UC2637DWG4 FAQ
1.How can I place an order for UC2637DWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2637DWG4 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 UC2637DWG4 reliable?
The price and inventory of UC2637DWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2637DWG4 is usually 5 days.
3.What payment methods are accepted for UC2637DWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2637DWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2637DWG4?
UC2637DWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2637DWG4 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 UC2637DWG4?
For technical support, including UC2637DWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2637DWG4 requirements.
6.How does Aetrix verify that UC2637DWG4 is sourced from the original manufacturer or authorized distributors?
All UC2637DWG4 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 UC2637DWG4 meets industry standards.
7.What is the process for return or replacement of UC2637DWG4?
All UC2637DWG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC2637DWG4, 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 UC2637DWG4 part is unused and in its original packaging.
Return procedure for UC2637DWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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