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Texas Instruments UC3637QG3
- Part No.:
- UC3637QG3
- Manufacturer:
- Texas Instruments
- Category:
- Motor Drivers, Controllers
- Package:
- 20-LCC (J-Lead)
- Datasheet:
-
UC3637QG3.pdf
- Description:
- IC MOTOR DRIVER 2.5V-20V 20PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,112
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Product details
Overview
UC3637QG3 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, pulse-by-pulse current limiting, under-voltage lockout, and a 2.5V temperature-compensated shutdown threshold. It operates across 0°C to +70°C, supports ±2.5V to ±20V dual supplies, and delivers precise oscillator accuracy (±10% over temperature) for servo and motion control systems.
For engineers reviewing the UC3637QG3 datasheet, UC3637QG3 pinout, UC3637QG3 application, or UC3637QG3 equivalent, key selection criteria include its dual PWM comparator architecture, ±20mA error amplifier output drive, 100mA steady-state output capability, and PLCC-20 package compatibility with industrial motor drive layouts.
Technical Context
The UC3637QG3 integrates a sawtooth oscillator with externally programmable frequency via RT/CT, two uncommitted PWM comparators accepting analog error signals at pins 9–12, and an error amplifier with 15 V/µs slew rate and 2 MHz unity-gain bandwidth. Its current-limit circuit uses a latched 200mV offset amplifier with differential inputs referenced to -VS.
Shutdown activation occurs when the SHUTDOWN pin (Pin 15) is pulled >2.5V below +VS, forcing outputs low; under-voltage lockout engages below 4.15V on +VS relative to -VS. Output drivers switch up to 500mA pulsed while maintaining rail-to-rail swing within 2V of supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 10 kHz typical (±10% over 0°C to +70°C); sets PWM carrier timing for motor commutation |
| Output Drive Capability | ±100 mA steady-state, ±500 mA pulsed (Pins 4 & 7); directly drives gate of power FETs or bipolar transistors |
| Error Amplifier Slew Rate | 15 V/µs; enables fast response to position/speed error transients in closed-loop servo systems |
| Current Limit Threshold | 200 mV offset (±10 mV T.C.); provides precise, temperature-stable pulse-by-pulse overcurrent protection |
| Shutdown Threshold | -2.5 V (±0.2 V hysteresis) referenced to +VS; allows robust external fault detection without level-shifting |
| Supply Voltage Range | ±2.5 V to ±20 V; supports wide-range industrial DC bus voltages including ±12 V and ±15 V systems |
| Operating Temperature | 0°C to +70°C; qualified for commercial-grade embedded motor control environments |
Pinout & Package
UC3637QG3 is housed in a 20-pin PLCC (Plastic Leaded Chip Carrier) package, surface-mount compatible with standard reflow profiles (MSL Level-2-260°C-1 year), lead finish CuSn, and marked "UC3637Q".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+VTH) | Oscillator upper threshold reference | Sets positive ramp limit for sawtooth waveform; determines oscillator frequency with RT/CT |
| 2 (CT) | Oscillator timing capacitor connection | Connects external capacitor to ground; defines oscillator period with RT and +VTH/-VTH |
| 3 (-VTH) | Oscillator lower threshold reference | Sets negative ramp limit; enables frequency stability over supply variation when RT referenced to -VS |
| 4 (AOUT) | Output A driver | ±100 mA source/sink PWM output for one half-bridge leg; rail-to-rail swing within 2V of supplies |
| 5 (-VS) | Negative supply rail | Power return for internal circuitry and output stage; referenced for shutdown and current limit thresholds |
| 7 (+VS) | Positive supply rail | Main power input for analog and output stages; used as reference for shutdown comparator |
| 8 (BOUT) | Output B driver | Independent ±100 mA PWM output for second half-bridge leg; complementary or phase-shifted per modulation scheme |
| 9 (+BIN) | Comparator B non-inverting input | Accepts summed error signal + deadtime bias; configures zero-, small-, or increased-deadtime operation |
| 10 (-BIN) | Comparator B inverting input | Connects to oscillator ramp; comparison generates PWM duty cycle for BOUT |
| 11 (-AIN) | Comparator A inverting input | Receives oscillator ramp; paired with +AIN to generate AOUT PWM |
| 12 (+AIN) | Comparator A non-inverting input | Accepts error signal polarity and magnitude; determines direction and torque command for motor winding A |
| 13 (+C/L) | Current limit positive sense input | Differential input for high-side current sensing; triggers latch on >200 mV differential |
| 14 (-C/L) | Current limit negative sense input | Paired with +C/L; rejects common-mode noise up to ±VS – 3 V |
| 15 (SHUTDOWN) | Enable/disable control input | Active-low enable referenced to +VS; -2.5 V threshold ensures immunity to supply ripple |
| 17 (+E/A) | Error amplifier non-inverting input | High-impedance node for position/speed feedback signal; CMR extends to ±VS – 2 V |
| 18 (-E/A) | Error amplifier inverting input | Accepts reference or setpoint; forms transconductance loop with E/A output (Pin 19) |
| 19 (E/A OUTPUT) | Error amplifier output | Drives ±20 mA into external compensation network; interfaces directly to +BIN/-AIN summing nodes |
| 20 (ISET) | Oscillator charging current set | Internally buffered +VTH voltage; develops CT charging current through RT for stable frequency |
Key Features
| Feature | Design Value |
|---|---|
| Dual uncommitted PWM comparators | Enables flexible modulation schemes (zero/small/increased deadtime) by independently configuring +BIN/-BIN and +AIN/-AIN |
| Temperature-compensated shutdown | Fixed -2.5 V threshold (±40 mV hysteresis) referenced to +VS eliminates need for external voltage dividers or thermal sensors |
| Pulse-by-pulse current limiting | Latched 200 mV differential threshold with <±0.2 mV/°C drift protects power stage during stall or short-circuit events |
| ±2.5V to ±20V dual-supply operation | Supports direct interface to industrial ±12 V or ±15 V rails without level-shifting or regulation |
| 15 V/µs error amplifier slew rate | Ensures <1 µs response to step errors in high-bandwidth position loops, minimizing settling time in servo applications |
Applications
| Industrial CNC Axis Control | Automated Packaging Conveyor Drive |
|---|---|
Use Scenario: Precise bidirectional positioning of milling head or tool carriage using analog velocity/position commands. IC Role / Device Role / Timing Role: UC3637QG3 acts as the PWM modulator and driver interface between microcontroller DAC output and H-bridge power stage. Use Value: Dual independent PWM outputs with programmable deadtime prevent shoot-through while maintaining torque linearity across full speed range. | Use Scenario: Variable-speed belt drive controlling fill volume and bottle spacing in high-throughput packaging lines. IC Role / Device Role / Timing Role: UC3637QG3 serves as the analog-input motor controller, converting 0–10 V speed reference into synchronized PWM for brushless DC or brushed motor. Use Value: Under-voltage lockout and pulse-by-pulse current limiting ensure reliable restart after brownouts and protect against jam-induced overcurrent. |
| Medical Infusion Pump Motor Control | Lab Automation Robotic Arm Joint |
Use Scenario: Low-noise, repeatable peristaltic pump actuation requiring smooth start/stop and microstep-like resolution. IC Role / Device Role / Timing Role: UC3637QG3 implements closed-loop speed control using tachometer feedback fed to its error amplifier inputs. Use Value: 15 V/µs slew rate and 2 MHz bandwidth enable tight speed regulation (<±0.5% error) even under varying load viscosity. | Use Scenario: Compact joint actuator in multi-axis robotic arm where space-constrained PCB layout demands integrated driver logic. IC Role / Device Role / Timing Role: UC3637QG3 functions as the PWM generator and gate driver pre-driver for discrete MOSFET half-bridges in each joint. Use Value: ±100 mA source/sink outputs reduce external buffer requirements, enabling direct FET gate drive with minimal component count. |
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 | SOIC-20 package; same electrical specs, identical pinout mapping, RoHS-compliant CuNiPdAu finish | Surface-mount but requires larger board area than PLCC; better thermal dissipation at TC | Select UC3637DW for new designs needing active production support and automated assembly compatibility |
| UC2637Q | Same PLCC-20 package; rated for -25°C to +85°C; oscillator initial accuracy ±10% (vs UC3637QG3's ±11% max) | Wider temperature range suits extended-environment industrial enclosures; slightly looser oscillator tolerance | Choose UC2637Q when operating ambient exceeds +70°C but PLCC form factor is mandatory |
Compared with UC3637DW and UC2637Q, the UC3637QG3 offers identical functional capability in a legacy PLCC package with verified 0°C to +70°C performance, making it suitable for cost-sensitive, space-constrained legacy motor control upgrades where SOIC footprint or extended temperature is not required.
Availability
UC3637QG3 is available at Aetrix Electronics and suitable for industrial CNC axis control, automated packaging conveyor drive, medical infusion pump motor control, and lab automation robotic arm joint applications requiring stable component supply and long-term obsolescence management.
Supply support for UC3637QG3 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 leader specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in industrial control ICs.
The UC3637 product line was developed specifically for analog-input, bi-directional DC motor drive systems requiring integrated PWM generation, protection, and driver-stage interfacing in commercial-temperature environments.
FAQ
What is the maximum continuous output current capability of the UC3637QG3?
The UC3637QG3 provides ±100 mA steady-state source/sink current on Pins 4 (AOUT) and 7 (BOUT). It supports up to ±500 mA on a pulsed basis for rapid gate charging of power FETs, as confirmed in the Absolute Maximum Ratings table and Output Section electrical characteristics under ISOURCE/ISINK conditions at 20 mA and 100 mA loads.
Does the UC3637QG3 support single-supply operation?
Yes, the UC3637QG3 supports single-supply operation per its Functional Description stating "Single or Dual Supply Operation" and Absolute Maximum Ratings specifying ±2.5V to ±20V input supply range - interpreted as ±Vs, meaning it can operate with ground-referenced positive and negative rails (e.g., +15 V and GND as +Vs and -Vs). This enables use in grounded-system motor drives without split supplies.
How is the oscillator frequency set on the UC3637QG3?
The UC3637QG3 oscillator frequency is set externally using resistor RT between Pin 20 (ISET) and Pin 2 (CT), and capacitor CT between Pin 2 and ground. The +VTH (Pin 1) and -VTH (Pin 3) voltages define the sawtooth amplitude, and the charging current through RT develops the ramp slope. Typical configuration uses RT = 16.7 kΩ and CT = 1500 pF for 10 kHz operation, as specified in the Electrical Characteristics test conditions.
What is the function of Pins 13 and 14 on the UC3637QG3?
Pins 13 (+C/L) and 14 (-C/L) are the differential inputs of the latched current limit amplifier. They accept a small-signal voltage drop across a sense resistor placed in the motor phase path. When the differential exceeds 200 mV (typical), the current limit circuit activates, blanking both AOUT and BOUT pulses until the next oscillator cycle - providing pulse-by-pulse protection as documented in the Functional Description and Electrical Characteristics tables.
Is the UC3637QG3 pin-compatible with other members of the UC3637 family?
Yes, the UC3637QG3 shares identical pinout and functionality with all UC3637 variants including UC3637DW, UC3637N, and UC3637J, as confirmed by the unified PACKAGE PIN FUNCTION diagram covering UC1637/UC2637/UC3637 and consistent pin numbering across PLCC, SOIC, PDIP, and CDIP packages in the Package Option Addendum.
UC3637QG3 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)
UC3637QG3 FAQ
1.How can I place an order for UC3637QG3 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3637QG3 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 UC3637QG3 reliable?
The price and inventory of UC3637QG3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3637QG3 is usually 5 days.
3.What payment methods are accepted for UC3637QG3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3637QG3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3637QG3?
UC3637QG3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3637QG3 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 UC3637QG3?
For technical support, including UC3637QG3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3637QG3 requirements.
6.How does Aetrix verify that UC3637QG3 is sourced from the original manufacturer or authorized distributors?
All UC3637QG3 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 UC3637QG3 meets industry standards.
7.What is the process for return or replacement of UC3637QG3?
All UC3637QG3 units undergo pre-shipment inspection (PSI). If there is an issue with UC3637QG3, 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 UC3637QG3 part is unused and in its original packaging.
Return procedure for UC3637QG3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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