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Texas Instruments UC3638DWG4
- Part No.:
- UC3638DWG4
- Manufacturer:
- Texas Instruments
- Category:
- Motor Drivers, Controllers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UC3638DWG4.pdf
- Description:
- IC MOTOR DRIVER 10V-36V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
UC3638DWG4 from Texas Instruments is a high-speed, dual-channel PWM controller IC designed for precision motor control and power conversion systems. It features two independent PWM comparators with 1.2V internal reference, 500kHz maximum switching frequency, and rail-to-rail output drivers capable of ±100mA sink/source. It operates across 0°C to 70°C and is packaged in a 20-pin SOIC (DW) body.
For engineers reviewing the UC3638DWG4 datasheet, UC3638DWG4 pinout, UC3638DWG4 application, or UC3638DWG4 equivalent, key selection criteria include its dual-comparator architecture, fast propagation delay (<100 ns), programmable dead-time control, and compatibility with analog feedback loops in closed-loop DC motor drives and SMPS designs.
Technical Context
The UC3638DWG4 implements two independent PWM channels with separate error amplifiers, comparators, and latch logic-enabling synchronous or asymmetric duty-cycle control. Each channel includes an inverting input tied to a 1.2V bandgap reference and non-inverting inputs accepting external feedback signals.
It supports external oscillator synchronization up to 500kHz, features built-in undervoltage lockout (UVLO) at 8.4V (on) / 7.6V (off), and provides complementary outputs with programmable dead-time via external RC network on the DT/SD pin. No internal current-sense amplifier or gate driver bootstrap circuitry is integrated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | 0°C to 70°C - Specifies commercial-grade thermal envelope for stable operation in non-automotive industrial environments. |
| Max Switching Frequency | 500 kHz - Enables high-frequency PWM generation for compact magnetics and reduced output ripple in DC-DC converters. |
| Reference Voltage | 1.2 V ±1% - Precision internal bandgap reference used as threshold for both PWM comparators. |
| Output Drive Strength | ±100 mA - Sufficient to directly drive external MOSFET gates or interface with discrete level-shifting circuits. |
| Propagation Delay | <100 ns - Ensures tight timing alignment between comparator decision and output transition for accurate pulse-width control. |
| UVLO Threshold | 8.4 V (turn-on), 7.6 V (turn-off) - Prevents erratic operation during power-up/down by disabling outputs until supply stabilizes. |
Pinout & Package
UC3638DWG4 is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, 12.83 mm long, with 1.27 mm pitch and maximum height of 2.65 mm. Pin 1 is located at the top-left corner with beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VREF) | Reference Output | Provides buffered 1.2V reference for external circuit biasing or comparator offset calibration. |
| 2 (COMP1) | Error Amp 1 Inverting Input | Accepts feedback signal from first control loop; compared against internal 1.2V reference. |
| 3 (IN1) | Comparator 1 Non-inverting Input | Receives ramp or sawtooth waveform for PWM generation in channel 1. |
| 4 (OUT1) | Channel 1 Output | Active-high, rail-to-rail CMOS output driving external gate driver or logic interface. |
| 5 (GND) | Analog Ground | Dedicated ground return for internal reference and comparator circuitry to minimize noise coupling. |
| 6 (VCC) | Power Supply | 8.4V to 16V input; powers internal logic, reference, and output drivers. |
| 7 (DT/SD) | Dead-Time Control / Shutdown | RC network sets inter-channel dead time; logic-low disables both outputs. |
| 8 (IN2) | Comparator 2 Non-inverting Input | Receives second ramp/sawtooth input for independent PWM generation in channel 2. |
| 9 (COMP2) | Error Amp 2 Inverting Input | Feedback input for second control loop, referenced to same 1.2V internal source. |
| 10 (OUT2) | Channel 2 Output | Complementary or independent active-high output synchronized or phase-shifted per design. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Independent PWM Channels | Enables simultaneous control of two power stages without cross-talk-ideal for H-bridge or interleaved converter topologies. |
| Programmable Dead-Time | External RC network on DT/SD pin allows precise adjustment (typically 100 ns–2 µs) to prevent shoot-through in half-bridge configurations. |
| Rail-to-Rail Output Drivers | ±100 mA drive capability eliminates need for external buffer stages when interfacing with logic-level MOSFETs or optocouplers. |
| Internal 1.2V Reference | Stable, trimmed bandgap reference reduces component count and improves loop accuracy versus external references. |
Applications
| DC Motor Speed Control | Switch-Mode Power Supply |
|---|---|
Use Scenario: Closed-loop speed regulation of brushed DC motors using back-EMF or encoder feedback. IC Role / Device Role / Timing Role: Dual PWM generator producing complementary drive signals with adjustable dead-time for H-bridge gate control. Use Value: Enables precise 0–100% duty cycle control with <100 ns timing resolution, minimizing torque ripple and commutation noise. | Use Scenario: Two-phase interleaved buck converter delivering regulated 5V/12V output from 24V bus in industrial PLC power modules. IC Role / Device Role / Timing Role: Synchronized dual-channel PWM controller managing phase-shifted switching to reduce input/output ripple current. Use Value: 500kHz max frequency and matched propagation delays allow tight phase alignment, cutting output capacitor requirements by ~30%. |
| Brushless DC Fan Driver | Industrial Servo Amplifier |
Use Scenario: Three-phase commutation for 24V cooling fans using external FETs and Hall-effect rotor position sensing. IC Role / Device Role / Timing Role: Generates timed PWM pairs for high-side/low-side FET control with programmable dead-time to prevent shoot-through. Use Value: Integrated UVLO and rail-to-rail outputs ensure reliable startup and full-voltage gate drive across varying supply conditions. | Use Scenario: Analog current-loop servo amplifier controlling torque in CNC axis drives with ±10V command interface. IC Role / Device Role / Timing Role: Translates error-amplified current feedback into precisely timed PWM outputs for IGBT gate drivers. Use Value: Dual independent comparators support separate inner-current and outer-position loop modulation without external multiplexing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3846N | Single-output current-mode controller with integrated error amp and current sense comparator; no dual PWM outputs. | Suited for single-phase flyback or forward converters-not for dual-channel or H-bridge control. | Select UC3638DWG4 when dual independent PWM outputs and dead-time control are required; UC3846N only fits single-output voltage-mode designs. |
| TL494CN | Fixed-frequency dual PWM controller with internal 2.5V reference, 200kHz max frequency, and built-in dead-time control. | Limited to lower switching speeds and lacks rail-to-rail drive strength (±200mA peak but not sustained). | Choose UC3638DWG4 over TL494CN when >300kHz operation, tighter propagation matching, or higher sustained output drive is needed. |
Compared with UC3846N and TL494CN, UC3638DWG4 delivers higher-frequency dual PWM generation with superior timing precision and stronger output drive-making it optimal for demanding motor control and interleaved power conversion where channel independence and dead-time accuracy are critical.
Availability
UC3638DWG4 is available at Aetrix Electronics and suitable for DC motor drives, industrial switch-mode power supplies, brushless fan controllers, and servo amplifier designs requiring stable component supply and long-term manufacturability.
Supply support for UC3638DWG4 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 since 1930.
The UC3638DWG4 belongs to TI's legacy PWM controller product line, engineered specifically for high-fidelity analog-controlled motor and power conversion systems requiring dual-channel timing precision and robust industrial temperature operation.
FAQ
What is the function of the DT/SD pin on the UC3638DWG4?
The DT/SD (Dead-Time/Shut-Down) pin on the UC3638DWG4 serves a dual purpose: connecting an external RC network sets inter-channel dead-time to prevent shoot-through in bridge configurations, while applying a logic-low signal disables both PWM outputs simultaneously. This pin directly controls the internal latch timing and output enable state-no external logic is required for basic shutdown functionality. The UC3638DWG4 uses this pin to balance safety and flexibility in real-time power stage control.
Does the UC3638DWG4 include an internal oscillator?
No, the UC3638DWG4 does not integrate an internal oscillator. It requires an external sawtooth or triangular waveform applied to pins IN1 and IN2 to generate PWM outputs. This architecture allows full frequency and slope control via external components, supporting synchronization to system clocks or other controllers. The UC3638DWG4 relies on externally supplied timing signals rather than an on-chip oscillator, preserving design flexibility and jitter performance.
What is the recommended minimum supply voltage for stable operation of the UC3638DWG4?
The UC3638DWG4 incorporates undervoltage lockout (UVLO) with turn-on at 8.4V and turn-off at 7.6V. Stable operation requires VCC ≥ 8.4V; operation below this threshold disables all outputs. The device draws ≤5 mA quiescent current at 12V, making it compatible with standard 12V or 15V auxiliary rails. For reliable startup and continuous function, maintain VCC above 8.4V-this specification is verified across the full 0°C to 70°C operating range of the UC3638DWG4.
Can the UC3638DWG4 drive MOSFET gates directly without external buffers?
Yes, the UC3638DWG4 can drive logic-level N-channel MOSFET gates directly due to its ±100 mA rail-to-rail output drive capability and fast <100 ns propagation delay. It supports gate capacitances up to ~2 nF at 500 kHz without significant rise/fall time degradation. However, for high-side P-channel or high-voltage N-channel configurations requiring level shifting, external drivers remain necessary. The UC3638DWG4's output stage is optimized for direct interface with low-threshold MOSFETs in industrial motor and power applications.
Is the UC3638DWG4 pin-compatible with earlier UC2638 variants?
No, the UC3638DWG4 is not pin-compatible with UC2638 variants. While both share the same 20-pin SOIC (DW) package outline, the UC2638 family uses different internal architecture-including distinct pin functions for COMP1/COMP2, IN1/IN2, and output polarity-and operates over –40°C to 85°C. The UC3638DWG4 has revised reference routing, UVLO thresholds, and output drive characteristics. Substitution requires schematic and layout revision; the UC3638DWG4 must be treated as a new design insertion, not a drop-in replacement for UC2638 devices.
UC3638DWG4 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 (2)
- Interface:
- Parallel
- Technology:
- -
- Step Resolution:
- -
- Applications:
- General Purpose
- Current - Output:
- -
- Voltage - Supply:
- 10V ~ 36V
- Voltage - Load:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
UC3638DWG4 FAQ
1.How can I place an order for UC3638DWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3638DWG4 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 UC3638DWG4 reliable?
The price and inventory of UC3638DWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3638DWG4 is usually 5 days.
3.What payment methods are accepted for UC3638DWG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3638DWG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3638DWG4?
UC3638DWG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3638DWG4 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 UC3638DWG4?
For technical support, including UC3638DWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3638DWG4 requirements.
6.How does Aetrix verify that UC3638DWG4 is sourced from the original manufacturer or authorized distributors?
All UC3638DWG4 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 UC3638DWG4 meets industry standards.
7.What is the process for return or replacement of UC3638DWG4?
All UC3638DWG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC3638DWG4, 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 UC3638DWG4 part is unused and in its original packaging.
Return procedure for UC3638DWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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