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Texas Instruments UC2637DWTR
- Part No.:
- UC2637DWTR
- Manufacturer:
- Texas Instruments
- Category:
- Motor Drivers, Controllers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UC2637DWTR.pdf
- Description:
- IC MOTOR DRIVER 2.5V-20V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,930
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Product details
Overview
UC2637DWTR 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 (Pins 4 and 7), ±2.5V to ±20V dual-supply operation, and pulse-by-pulse current limiting. It integrates a sawtooth oscillator, error amplifier, and two uncommitted PWM comparators, and is characterized for -25°C to +85°C operation in SOIC-20 package.
For engineers reviewing the UC2637DWTR datasheet, UC2637DWTR pinout, UC2637DWTR application, or UC2637DWTR equivalent, key selection considerations include its dual-output PWM modulation architecture, temperature-compensated 2.5V shutdown threshold, under-voltage lockout at 4.15V–5.0V, ±5% initial oscillator accuracy, and compatibility with POWERFET or bipolar transistor gate driving in servo and motion control systems.
Technical Context
The UC2637DWTR implements a fixed-frequency sawtooth oscillator whose frequency is set externally via RT and CT components, with ±5% initial accuracy and ±10% variation over temperature. Its dual PWM comparators accept uncommitted analog inputs (e.g., Pins 9/11 for deadtime control and Pins 10/8 for error signal polarity) to generate complementary drive signals with configurable deadtime or deadband modes.
Internal protection includes under-voltage lockout referenced to ±VS, a temperature-compensated shutdown comparator with 40mV hysteresis, and a latched current-limit amplifier with 200mV offset and differential sensing capability. The error amplifier delivers 15 V/µs slew rate, 2 MHz unity-gain bandwidth, and ±20mA output drive into the PWM comparators' summing node.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 10 kHz nominal (±5% initial, ±10% over -25°C to +85°C); set by external RT/CT for stable timing in motor commutation. |
| Supply Voltage Range | ±2.5V to ±20V dual supply; supports wide-range industrial motor drive rails without level-shifting circuitry. |
| Output Drive Capability | ±100mA continuous source/sink per output (Pins 4, 7); enables direct gate driving of discrete POWERFETs or bipolar transistors. |
| Shutdown Threshold | -2.5V ±0.2V (temperature-compensated); allows precise, drift-free disable control using open-collector NPN or logic-level signals. |
| Current Limit Offset | 200 mV ±10 mV; sets accurate, repeatable peak-current trip point for pulse-by-pulse overcurrent protection. |
| Error Amplifier Slew Rate | 15 V/µs; ensures fast transient response to position or speed error signals in closed-loop servo systems. |
| Input Common-Mode Range | -VS+2V to +VS for error amp and comparators; accommodates full-rail sensor feedback without attenuation or biasing. |
Pinout & Package
UC2637DWTR is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-2-260°C-1 year rating, and 2.65 mm max height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+VTH) | Oscillator upper threshold input | Sets positive ramp limit for sawtooth waveform; determines oscillator frequency with RT/CT network. |
| 2 (CT) | Oscillator timing capacitor connection | Connects external capacitor to ground; defines oscillator period alongside RT and +VTH/-VTH voltages. |
| 3 (-VTH) | Oscillator lower threshold input | Sets negative ramp limit; enables programmable frequency stability across supply variations. |
| 4 (AOUT) | Output A driver | Dual-source/sink PWM output (±100mA) for one side of H-bridge or single-ended power stage. |
| 5 (-VS) | Negative supply rail | Reference for internal circuitry and output low-state voltage; must be decoupled near pin. |
| 6 (N/C) | No connect | Internally unused; leave floating or grounded per layout best practices. |
| 7 (+VS) | Positive supply rail | Reference for internal circuitry and output high-state voltage; requires local ceramic bypass. |
| 8 (BOUT) | Output B driver | Independent dual-source/sink PWM output (±100mA) for second H-bridge leg or auxiliary channel. |
| 9 (+BIN) | Comparator B non-inverting input | Accepts reference or deadtime-adjust voltage for PWM B duty cycle control. |
| 10 (-BIN) | Comparator B inverting input | Receives error signal or summed feedback for polarity-sensitive modulation of Output B. |
| 11 (-AIN) | Comparator A inverting input | Primary error signal input; negative polarity lengthens AOUT high time and shortens BOUT high time. |
| 12 (+AIN) | Comparator A non-inverting input | Optional reference or bias input; used with -AIN to configure differential error detection. |
| 13 (+C/L) | Current limit positive sense | Connects to high-side current-sense resistor; initiates latch-off on >200mV differential. |
| 14 (-C/L) | Current limit negative sense | Returns to sense resistor low-side; forms differential pair with +C/L for noise-immune overcurrent detection. |
| 15 (SHUTDOWN) | Enable/disable control input | Pulls below -2.5V (w.r.t. +VS) to enable outputs; open or pulled high disables both drivers. |
| 16 (N/C) | No connect | Internally unused; no external connection required. |
| 17 (+E/A) | Error amplifier non-inverting input | Accepts position/speed command or reference voltage for closed-loop regulation. |
| 18 (-E/A) | Error amplifier inverting input | Receives feedback signal (e.g., motor current or encoder-derived velocity) for error computation. |
| 19 (E/A OUTPUT) | Error amplifier output | Drives internal PWM comparators' summing node; capable of ±20mA sourcing/sinking. |
| 20 (ISET) | Oscillator charging current set | Internally biased by +VTH; configures CT charging current to maintain frequency stability vs. supply. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PWM outputs | Each provides ±100mA drive with 100ns rise/fall times, enabling direct interface to discrete power switches without buffer stages. |
| Programmable deadtime/deadband | Configured via differential voltage between Pins 9/11 and 10/12, allowing trade-off between torque stiffness and shoot-through prevention in H-bridge designs. |
| Temperature-stabilized shutdown | 2.5V threshold with ±0.2V tolerance and 40mV hysteresis ensures reliable disable across -25°C to +85°C without external compensation. |
| Pulse-by-pulse current limiting | Latched protection triggered by 200mV differential across +C/L and -C/L pins, providing cycle-by-cycle fault containment without software intervention. |
| Wide dual-supply operation | ±2.5V to ±20V range supports 5V logic-level systems up to ±15V industrial motor drives, eliminating need for supply translation. |
Applications
| Industrial Servo Positioning | DC Motor Speed Control |
|---|---|
Use Scenario: Precision closed-loop positioning of CNC axes using analog encoder feedback and ±15V H-bridge power stages. IC Role / Device Role / Timing Role: UC2637DWTR acts as the analog PWM modulator core, converting position error into complementary drive signals with zero-deadtime configuration for maximum stiffness. Use Value: Delivers <1% speed ripple and sub-micron positioning resolution by maintaining tight oscillator accuracy (±5%) and low error amp offset (1.5 mV). | Use Scenario: Variable-speed fan or pump control in HVAC systems powered from ±12V supplies with thermal foldback protection. IC Role / Device Role / Timing Role: UC2637DWTR serves as the switched-mode controller, generating PWM outputs synchronized to a 10 kHz sawtooth for smooth torque delivery. Use Value: Enables >90% efficiency at full load via ±100mA output drivers that eliminate external gate buffers, reducing BOM count and board area. |
| Bi-Directional Actuator Drive | Lab Equipment Motion Control |
Use Scenario: Linear actuator in automated test equipment requiring reversible motion, stall detection, and soft-start sequencing. IC Role / Device Role / Timing Role: UC2637DWTR provides bidirectional PWM drive with programmable deadband (via Pin 9/11 differential) to eliminate null-point oscillation during low-speed positioning. Use Value: Reduces audible coil whine and mechanical wear by suppressing unnecessary switching near zero error, enabled by uncommitted comparator inputs. | Use Scenario: High-accuracy XY stage in optical alignment systems using analog potentiometer feedback and ±5V supplies. IC Role / Device Role / Timing Role: UC2637DWTR functions as the analog servo modulator, accepting low-level feedback signals and delivering matched rise/fall times (<300 ns) for symmetrical step response. Use Value: Achieves <5 µs settling time due to 15 V/µs error amplifier slew rate and 2 MHz unity-gain bandwidth, critical for sub-millisecond move-and-settle cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM motor controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3637DWTR | Rated for 0°C to +70°C commercial temperature range; identical pinout, oscillator accuracy, and output drive specs. | Intended for non-industrial environments (e.g., consumer appliances, office equipment) where extended temperature operation is not required. | Select UC3637DWTR only when ambient operating conditions remain within 0–70°C and cost sensitivity outweighs industrial-grade reliability. |
| TL494CN | Single-ended output topology (not dual complementary), fixed 2.5V reference, no integrated current-limit comparator, 100 mA sink-only outputs. | Suited for simpler flyback or forward converters, not bi-directional motor drive; lacks deadtime control and dual-output flexibility. | Choose TL494CN only for cost-constrained, single-channel PWM applications where UC2637DWTR's dual-drive, current-limit, and deadtime features are unnecessary. |
Compared with UC3637DWTR, UC2637DWTR offers extended -25°C to +85°C operation for harsher environments, while TL494CN requires external circuitry to emulate dual-output and current-limit functionality-increasing design complexity and component count.
Availability
UC2637DWTR is available at Aetrix Electronics and suitable for industrial servo positioning, DC motor speed control, bi-directional actuator drive, and lab equipment motion control requiring stable component supply across extended temperature ranges.
Supply support for UC2637DWTR 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, specializing in analog, embedded processing, and power management technologies for industrial, automotive, and communications markets.
The UC2637DWTR belongs to TI's legacy UCx637 family of analog PWM motor controllers, engineered specifically for high-reliability, temperature-stable DC motor drive in military, aerospace, and industrial motion systems where digital microcontrollers were impractical.
FAQ
What is the operating temperature range specified for the UC2637DWTR?
The UC2637DWTR is characterized for operation from -25°C to +85°C, as confirmed in the Electrical Characteristics table and Package Option Addendum. This extended industrial temperature range distinguishes it from the UC3637DWTR (0°C to +70°C) and UC1637 (–55°C to +125°C), making UC2637DWTR suitable for demanding factory-floor and outdoor equipment applications where thermal margin is critical. The SOIC-20 package supports this range with NIPDAU lead finish and MSL Level-2 reflow profile.
Does the UC2637DWTR support single-supply operation?
Yes, the UC2637DWTR supports single-supply operation as stated in the FEATURES section: "Single or Dual Supply Operation". When operated from a single supply, the -VS pin (Pin 5) is connected to ground, and the +VS pin (Pin 7) receives the positive rail (e.g., +15V). All analog inputs and outputs remain functional within their common-mode ranges (e.g., -VS+2V to +VS), and the internal oscillator, error amplifier, and comparators retain full performance. The UC2637DWTR datasheet confirms this capability explicitly in the Functional Description and Absolute Maximum Ratings.
How is the oscillator frequency set on the UC2637DWTR?
The oscillator frequency of the UC2637DWTR is set externally using three elements: an external resistor (RT) connected from Pin 20 (ISET) to -VS, an external capacitor (CT) connected from Pin 2 (CT) to ground, and voltage references applied to Pins 1 (+VTH) and 3 (-VTH). The sawtooth waveform's amplitude and period are determined by these components per the formula in Figure 1 of the datasheet. With typical values RT = 16.7 kΩ and CT = 1500 pF, the oscillator runs at 10 kHz ±5% initial accuracy. The UC2637DWTR's oscillator remains stable across supply variations because +VTH is internally buffered to ISET, proportionally scaling charging current with supply differential.
What protection features does the UC2637DWTR include?
The UC2637DWTR integrates three primary protection features: (1) Under-voltage lockout (UVLO) that holds outputs low until +VS reaches 4.15V–5.0V; (2) Pulse-by-pulse current limiting using differential inputs Pins 13 (+C/L) and 14 (-C/L) with a 200 mV threshold and latched response; and (3) A shutdown port (Pin 15) with a temperature-compensated -2.5V threshold and 40 mV hysteresis. These features operate independently and concurrently, enabling robust fault handling in motor drive systems without external supervision circuitry. All are verified in the Electrical Characteristics tables and Functional Description sections of the UC2637DWTR datasheet.
Can the UC2637DWTR drive MOSFET gates directly?
Yes, the UC2637DWTR can drive power MOSFET gates directly: each output (Pins 4 and 7) delivers ±100 mA continuous source/sink current and supports pulsed peaks up to 500 mA, with rise/fall times of 100–600 ns into typical gate capacitances. Its output voltage swing reaches within 0.2V of -VS (low) and 2.0V below +VS (high) at 50 mA, sufficient to fully enhance standard logic-level and standard-threshold N- and P-channel MOSFETs. Layout best practices-such as minimizing trace inductance and using local 0.1 µF ceramic bypass capacitors on +VS/-VS-must be followed to ensure clean switching and avoid shoot-through in bridge configurations.
UC2637DWTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
UC2637DWTR FAQ
1.How can I place an order for UC2637DWTR through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2637DWTR 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 UC2637DWTR reliable?
The price and inventory of UC2637DWTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2637DWTR is usually 5 days.
3.What payment methods are accepted for UC2637DWTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2637DWTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2637DWTR?
UC2637DWTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2637DWTR 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 UC2637DWTR?
For technical support, including UC2637DWTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2637DWTR requirements.
6.How does Aetrix verify that UC2637DWTR is sourced from the original manufacturer or authorized distributors?
All UC2637DWTR 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 UC2637DWTR meets industry standards.
7.What is the process for return or replacement of UC2637DWTR?
All UC2637DWTR units undergo pre-shipment inspection (PSI). If there is an issue with UC2637DWTR, 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 UC2637DWTR part is unused and in its original packaging.
Return procedure for UC2637DWTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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