My Inquiry
My Account
Texas Instruments UC2637QTR
- Part No.:
- UC2637QTR
- Manufacturer:
- Texas Instruments
- Category:
- Motor Drivers, Controllers
- Package:
- 20-LCC (J-Lead)
- Datasheet:
-
UC2637QTR.pdf
- Description:
- IC MOTOR DRIVER 2.5V-20V 20PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,813
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
UC2637QTR from Texas Instruments is a monolithic PWM motor controller IC designed for bi-directional DC motor drive applications in industrial and embedded systems. It integrates a sawtooth oscillator, dual PWM comparators, ±100mA source/sink output drivers, error amplifier, under-voltage lockout, pulse-by-pulse current limiting, and a temperature-compensated 2.5V shutdown threshold. It operates across -25°C to +85°C and supports ±2.5V to ±20V dual supplies.
For engineers reviewing the UC2637QTR datasheet, UC2637QTR pinout, UC2637QTR application, or UC2637QTR equivalent, key selection considerations include its dual-output PWM modulation architecture, ±100mA driver capability, oscillator accuracy (±5% initial, ±10% over temperature), and compatibility with power-FET or bipolar transistor gate driving in servo and motion control circuits.
Technical Context
The UC2637QTR implements a fixed-frequency sawtooth oscillator whose frequency is set externally via RT and CT components, with thresholds defined by +VTH and -VTH pins. Its two uncommitted PWM comparators accept analog error signals and generate complementary pulse trains whose duty cycle and polarity reflect error magnitude and sign.
Internal protection includes pulse-by-pulse current limiting using a latched amplifier with 200mV offset, under-voltage lockout activating at 4.15–5.0V, and a shutdown comparator referenced to +VS with 2.5V threshold and 40mV hysteresis. The error amplifier delivers 15V/µs slew rate, 1MHz unity-gain bandwidth, and ±20mA output drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 10 kHz nominal (±5% initial, ±10% over temperature); sets PWM carrier timing for motor commutation |
| Supply Voltage Range | ±2.5V to ±20V dual supply; enables direct interface with high-voltage power stages without level-shifting |
| Output Drive Capability | ±100mA steady-state, up to ±500mA pulsed per output (Pins 4 & 7); directly drives power-FET gates or bipolar bases |
| Shutdown Threshold | 2.5V temperature-compensated threshold referenced to +VS (Pin 6); enables precise system-level fault shutdown |
| Error Amplifier Slew Rate | 15 V/µs; supports fast transient response in closed-loop position/speed servo systems |
| Operating Temperature | -25°C to +85°C; qualified for commercial/industrial environments, excluding military or extended ranges |
| Current Limit Offset | 200 mV typical; defines minimum sense voltage for reliable pulse-by-pulse overcurrent detection |
Pinout & Package
UC2637QTR is packaged in a 20-pin PLCC (FN package drawing), RoHS-compliant with CuSn lead finish, moisture sensitivity level 2 (260°C peak reflow), and marked "UC2637Q".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VTH (Pin 1) | Oscillator upper threshold input | Sets positive ramp limit of internal sawtooth; buffered to ISET for proportional charging current |
| CT (Pin 2) | Oscillator timing capacitor connection | Defines oscillator frequency with RT; external capacitor determines PWM carrier period |
| -VTH (Pin 3) | Oscillator lower threshold input | Sets negative ramp limit; establishes amplitude and symmetry of oscillator waveform |
| AOUT (Pin 4) | Output A driver | ±100mA source/sink PWM output for one motor phase or H-bridge leg |
| -VS (Pin 5) | Negative supply rail | Reference for internal circuitry and output low-level swing (typically -VS + 0.2V @50mA) |
| N/C (Pin 6) | No connect | Not internally bonded; must be left floating or tied to ground per layout guidelines |
| +VS (Pin 7) | Positive supply rail | Reference for internal circuitry and output high-level swing (typically +VS – 2.0V @50mA) |
| BOUT (Pin 8) | Output B driver | ±100mA source/sink PWM output, complementary or independent of AOUT for bi-directional drive |
| +BIN (Pin 9) | Comparator B non-inverting input | Uncommitted input for custom error summation or deadtime biasing in modulation schemes |
| -BIN (Pin 10) | Comparator B inverting input | Accepts feedback or reference signal; used with +BIN to configure deadband or zero-deadtime modes |
| -AIN (Pin 11) | Comparator A inverting input | Connects to motor current or position feedback; polarity determines output A/B state relationship |
| +AIN (Pin 12) | Comparator A non-inverting input | Accepts command signal or summed error; differential pair with -AIN sets PWM duty baseline |
| +C/L (Pin 13) | Current limit positive sense input | High-side or low-side current sense input; referenced to -VS for noise rejection |
| -C/L (Pin 14) | Current limit negative sense input | Differential partner to +C/L; enables accurate pulse-by-pulse overcurrent detection |
| SHUTDOWN (Pin 15) | Enable/disable control input | Pulled >2.5V below +VS to enable outputs; held low to force both outputs into low state |
| N/C (Pin 16) | No connect | Not internally bonded; no electrical function |
| +E/A (Pin 17) | Error amplifier non-inverting input | Primary command input for closed-loop control; accepts voltage references up to ±VS–2V |
| -E/A (Pin 18) | Error amplifier inverting input | Feedback node from motor or transducer; forms high-gain servo loop with E/A output (Pin 19) |
| E/A OUTPUT (Pin 19) | Error amplifier output | Drives ±20mA into external compensation network; interfaces directly to PWM comparator inputs |
| ISET (Pin 20) | Oscillator charging current set | Internally biased from +VTH; sets CT charging current to maintain stable frequency vs. supply variation |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PWM comparators | Uncommitted inputs allow flexible error summation, deadtime insertion, or deadband configuration per application need |
| ±100mA source/sink output drivers | Eliminates need for external driver stages when switching logic-level MOSFETs or small bipolar transistors |
| Pulse-by-pulse current limiting | Latched 200mV-offset amplifier enables real-time overcurrent protection without software intervention |
| Temperature-compensated 2.5V shutdown | Enables robust system-level fault management across full operating range without external reference |
| ±2.5V to ±20V wide supply range | Supports direct integration with diverse power stage topologies including half-bridge, H-bridge, and chopper drives |
Applications
| Industrial Servo Position Control | DC Motor Speed Regulation |
|---|---|
Use Scenario: Closed-loop positioning of CNC axes or robotic joints using potentiometric or encoder feedback. IC Role / Device Role / Timing Role: UC2637QTR acts as the analog PWM modulator core, converting position error into bidirectional drive pulses synchronized to its internal 10kHz oscillator. Use Value: Delivers 15V/µs error amplifier slew rate and ±100mA outputs to achieve <100ns rise/fall times, enabling sub-millisecond position settling in high-bandwidth loops. | Use Scenario: Variable-speed fan or pump control in HVAC or industrial automation where torque ripple must be minimized. IC Role / Device Role / Timing Role: UC2637QTR serves as the PWM generator and current monitor, accepting speed command voltage and motor current feedback to regulate average armature voltage. Use Value: Pulse-by-pulse current limiting with 200mV offset prevents winding saturation during startup surges while maintaining smooth low-speed operation. |
| Bi-Directional H-Bridge Drive | Power Amplifier Modulation Interface |
Use Scenario: Reversible actuator control in valve positioning or linear motion systems requiring precise direction and torque control. IC Role / Device Role / Timing Role: UC2637QTR generates complementary AOUT/BOUT signals with configurable deadtime (via Pins 9/11) to prevent shoot-through in discrete H-bridge power stages. Use Value: Independent +BIN/-BIN and +AIN/-AIN inputs allow hardware-based deadtime tuning without microcontroller involvement, reducing latency and firmware complexity. | Use Scenario: Driving Class-D audio or RF power amplifiers where analog input must be converted to high-fidelity PWM with minimal distortion. IC Role / Device Role / Timing Role: UC2637QTR functions as a precision analog-to-PWM converter, using its error amplifier and comparators to modulate carrier frequency with high linearity. Use Value: ±5% oscillator accuracy and low 20mV comparator offset ensure <0.5% THD in modulation transfer, critical for fidelity-sensitive amplification stages. |
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 block diagram and pinout; rated for 0°C to +70°C only (vs. UC2637QTR's -25°C to +85°C) | Targeted at consumer or lab-grade equipment; lacks extended industrial temperature margin | Select UC3637DW only if ambient operating conditions remain strictly within 0–70°C and cost is prioritized over thermal robustness |
| TL5001CDR | Single-output PWM controller with integrated 110V MOSFET driver; no dual-output or current-limit comparator; oscillator accuracy ±3% | Designed for flyback/forward SMPS, not motor drive; lacks bi-directional modulation logic or servo interface inputs | Choose TL5001CDR only for unidirectional power conversion applications where motor control features are unnecessary |
Compared with UC3637DW and TL5001CDR, the UC2637QTR uniquely combines dual PWM outputs, ±100mA drive strength, pulse-by-pulse current limiting, and industrial temperature rating-making it the only option among the three suitable for ruggedized bi-directional DC motor servo systems requiring hardware-level fault protection and wide supply tolerance.
Availability
UC2637QTR is available at Aetrix Electronics and suitable for industrial servo position control, DC motor speed regulation, bi-directional H-bridge drive, and power amplifier modulation interface applications requiring stable component supply and long-term industrial availability.
Supply support for UC2637QTR 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 communications markets.
The UC2637QTR belongs to TI's legacy UCx637 family of PWM motor controllers, engineered specifically for high-reliability analog-based DC motor drive systems where microcontroller-free, hardware-determined modulation and protection are required.
FAQ
What is the operating temperature range specified for the UC2637QTR?
The UC2637QTR is characterized for operation from -25°C to +85°C. This industrial-grade temperature range is explicitly defined in the Electrical Characteristics table and Functional Description section of the datasheet, distinguishing it from the UC1637 (-55°C to +125°C) and UC3637 (0°C to +70°C). The UC2637QTR's qualification ensures stable performance in factory-floor and outdoor-mounted control cabinets without forced cooling.
Does the UC2637QTR support single-supply operation?
Yes, the UC2637QTR supports single-supply operation. Although optimized for dual ±Vs supplies, its analog input common-mode range extends from -VS+2V to +VS, and its internal comparators and amplifier function correctly with ground-referenced supplies (e.g., +Vs = +15V, -Vs = 0V). The datasheet confirms this in the "Single or Dual Supply Operation" feature list and Absolute Maximum Ratings, where analog inputs tolerate voltages up to ±Vs relative to ground.
How is deadtime configured on the UC2637QTR?
Deadtime on the UC2637QTR is configured using the differential voltage between Pins 9 (+BIN) and 11 (-AIN), as described in the Modulation Schemes section. A small positive offset (Pin 9 > Pin 11) introduces controlled delay between AOUT and BOUT transitions to prevent shoot-through. The datasheet illustrates three configurations-zero deadtime, small deadtime, and increased deadband-each implemented solely through external resistor networks tied to these pins, with no register programming required.
What is the maximum continuous output current per channel for the UC2637QTR?
The UC2637QTR provides ±100mA continuous source/sink current per output (Pins 4 and 7), as confirmed in the "Dual 100mA, Source/Sink Output Drivers" feature list and Electrical Characteristics table. While it supports up to ±500mA pulsed current for brief switching events, sustained loading beyond ±100mA risks exceeding thermal limits-especially in the PLCC-20 package-requiring careful PCB copper area design per the Thermal Considerations note in the Packaging Section.
Is the UC2637QTR pin-compatible with other members of the UCx637 family?
Yes, the UC2637QTR shares identical pinout and functionality with UC1637 and UC3637 in the same package variant (e.g., PLCC-20 or SOIC-20). The Block Diagram, Connection Diagram, and PACKAGE PIN FUNCTION table confirm identical pin assignments across all three variants. However, temperature ratings and certain electrical parameters (e.g., oscillator stability over temperature) differ-so substitution requires verification of thermal and accuracy requirements for the target application.
UC2637QTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-PLCC (9x9)
UC2637QTR FAQ
1.How can I place an order for UC2637QTR through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2637QTR 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 UC2637QTR reliable?
The price and inventory of UC2637QTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2637QTR is usually 5 days.
3.What payment methods are accepted for UC2637QTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2637QTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2637QTR?
UC2637QTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2637QTR 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 UC2637QTR?
For technical support, including UC2637QTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2637QTR requirements.
6.How does Aetrix verify that UC2637QTR is sourced from the original manufacturer or authorized distributors?
All UC2637QTR 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 UC2637QTR meets industry standards.
7.What is the process for return or replacement of UC2637QTR?
All UC2637QTR units undergo pre-shipment inspection (PSI). If there is an issue with UC2637QTR, 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 UC2637QTR part is unused and in its original packaging.
Return procedure for UC2637QTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UC2637QTR Tags
-
DRV2603RUNR
Texas Instruments
-
DRV8837CDSGR
Texas Instruments
-
DRV8837DSGR
Texas Instruments
-
DRV8838DSGR
Texas Instruments
-
DRV8839DSSR
Texas Instruments
-
EMC2301-1-ACZL-TR
Microchip Technology
-
DRV8231ADSGR
Texas Instruments
-
EMC2302-2-AIZL-TR
Microchip Technology
-
DRV8800PWPR
Texas Instruments
-
DRV8835DSSR
Texas Instruments
-
EMC2303-1-KP-TR
Microchip Technology
-
DRV8876PWPR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
