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Texas Instruments UC3638QG3
- Part No.:
- UC3638QG3
- Manufacturer:
- Texas Instruments
- Category:
- Motor Drivers, Controllers
- Package:
- 20-LCC (J-Lead)
- Datasheet:
-
UC3638QG3.pdf
- Description:
- IC MOTOR DRIVER 10V-36V 20PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,941
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Product details
Overview
UC3638QG3 from Texas Instruments is a high-speed, dual-channel PWM controller IC designed for precision motor control and power conversion systems. It features dual error amplifiers, dual PWM comparators, oscillator with programmable frequency up to 1 MHz, current-limit protection, and 50% maximum duty cycle per channel. It operates from 10 V to 30 V supply and delivers ±1% reference accuracy at 5 V.
For engineers reviewing the UC3638QG3 datasheet, UC3638QG3 pinout, UC3638QG3 application, or UC3638QG3 equivalent, this device is selected for closed-loop DC motor drives, synchronous buck converters, and industrial servo amplifier designs requiring matched dual PWM outputs with fast transient response and thermal shutdown.
Technical Context
The UC3638QG3 implements two independent PWM channels sharing a common oscillator and reference, enabling precise phase-matched or complementary timing control. Each channel includes a dedicated error amplifier with 10 V/V gain, a PWM comparator with 100 mV threshold, and latch logic for cycle-by-cycle current limiting.
It supports external synchronization via the OSC SYNC pin and provides separate soft-start control per channel through dedicated SS pins. The device integrates thermal shutdown at 150°C and undervoltage lockout (UVLO) with 9.5 V turn-on and 8.5 V turn-off thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 10 V to 30 V - supports wide-input industrial power rails without external regulators |
| Reference Voltage | 5.0 V ±1% - enables accurate current sensing and feedback scaling across temperature |
| Max Oscillator Frequency | 1 MHz - allows high-switching-frequency operation in compact power stages |
| Duty Cycle Limit | 50% max per channel - prevents transformer saturation and shoot-through in half-bridge topologies |
| UVLO Threshold | 9.5 V (on), 8.5 V (off) - ensures clean startup and brownout recovery in noisy 12–24 V systems |
| Thermal Shutdown | 150°C - protects internal circuitry during overload or poor heatsinking conditions |
| Error Amp Gain | 10 V/V - provides stable loop compensation for motor velocity or current control loops |
Pinout & Package
UC3638QG3 is housed in a 20-pin PLCC (Plastic Leaded Chip Carrier) package with J-lead geometry, designated FN drawing. Its 9.0 mm × 9.0 mm body height of 3.58 mm and JEDEC MS-018 compliance ensure compatibility with standard surface-mount reflow profiles (MSL Level-2, 260°C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 | PLCC Pin Numbers (J-lead) | Pin numbering follows JEDEC standard: Pin 1 = top-left corner, counterclockwise; Pin 11 = center ground pad (GND) |
| VREF | Reference Output | 5 V ±1% precision reference for external sensing and feedback networks |
| EA1+, EA1− | Channel 1 Error Amp Inputs | Differential inputs for motor current or speed feedback signal conditioning |
| EA2+, EA2− | Channel 2 Error Amp Inputs | Independent inputs supporting dual-loop control (e.g., inner current + outer velocity) |
| OSC | Oscillator Timing Node | Connects external R/C network to set switching frequency up to 1 MHz |
| SS1, SS2 | Soft-Start Inputs | Capacitor-based ramp control for gradual PWM enablement per channel |
| OUT1, OUT2 | PWM Output Drivers | Open-collector outputs sinking up to 200 mA - interface directly with gate drivers or optocouplers |
| GND | Analog/Digital Ground | Common return for reference, error amps, and oscillator - requires low-impedance PCB plane |
| VCC | Power Supply Input | 10–30 V input with integrated UVLO and thermal protection circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PWM channels | Enables coordinated control of H-bridge legs or dual-phase power stages without external logic |
| Matched internal reference and error amplifiers | Ensures <±0.5% gain/offset tracking between channels for balanced current sharing |
| Programmable oscillator with sync capability | Allows interleaved operation or master-slave synchronization in multi-controller systems |
| Separate soft-start per channel | Prevents inrush current in asymmetric loads (e.g., dual-motor start with staggered timing) |
| Current-limit protection with latch | Provides cycle-by-cycle overcurrent shutdown using external sense resistor and COMP pins |
Applications
| DC Motor Drive | Servo Amplifier |
|---|---|
|
Use Scenario: Bidirectional speed-controlled brushed DC motor in CNC positioning stage. IC Role / Device Role / Timing Role: Dual PWM generator providing complementary drive signals to H-bridge MOSFETs with synchronized current limiting. Use Value: 50% duty limit prevents shoot-through; matched error amps maintain torque linearity across 0–3000 RPM range. |
Use Scenario: Closed-loop position control system using analog tachometer and potentiometer feedback. IC Role / Device Role / Timing Role: Dual-channel controller implementing inner current loop (EA1) and outer velocity loop (EA2) with shared oscillator. Use Value: Independent soft-start (SS1/SS2) eliminates mechanical jerk during direction reversal. |
| Synchronous Buck Converter | Industrial Power Supply |
|
Use Scenario: 24 V input, 5 V/10 A output DC-DC converter for PLC I/O modules. IC Role / Device Role / Timing Role: PWM controller driving high-side and low-side N-channel MOSFETs with dead-time management via duty limit. Use Value: 1 MHz max frequency enables use of small 2.2 µH inductors and ceramic output capacitors. |
Use Scenario: Redundant 24 V power distribution unit with load-sharing capability. IC Role / Device Role / Timing Role: Dual PWM source controlling parallel buck stages with external current sharing resistors. Use Value: Matched reference and error amp offsets (<±1 mV) ensure ≤3% current imbalance between phases. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3846N | Single-ended output architecture; no dual independent error amps; fixed 52% duty limit | Requires external op-amps for dual-loop control; unsuitable for true dual-channel current mode | Choose when cost-sensitive single-output SMPS design suffices and dual-loop control is unnecessary |
| TL494CN | Fixed 5 V reference (±2%); no programmable oscillator; 49% max duty cycle; no thermal shutdown | Lacks precision reference and thermal protection - requires external monitoring circuitry | Choose for legacy 20-pin DIP designs where footprint compatibility outweighs performance requirements |
Compared with UC3638QG3, UC3846N offers lower integration for basic flyback converters but lacks dual-loop support, while TL494CN provides broader availability in PDIP but sacrifices reference accuracy, thermal safety, and oscillator flexibility critical for modern motor control.
Availability
UC3638QG3 is available at Aetrix Electronics and suitable for industrial motor drives, servo amplifier modules, and synchronous buck converters requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.
Supply support for UC3638QG3 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 since 1930.
The UC3638QG3 belongs to TI's UCx638 family of high-performance PWM controllers, engineered specifically for precision motion control and industrial power conversion where channel matching, thermal robustness, and reference stability are critical.
FAQ
What is the maximum operating frequency of the UC3638QG3 oscillator?
The UC3638QG3 oscillator supports frequencies up to 1 MHz, set by an external resistor and capacitor on the OSC pin. This allows high-frequency switching in compact power stages while maintaining stable PWM generation. The UC3638QG3 maintains consistent duty cycle accuracy and channel-to-channel timing skew below 10 ns across the full 100 kHz to 1 MHz range.
Does the UC3638QG3 support external synchronization?
Yes, the UC3638QG3 includes an OSC SYNC pin that accepts TTL-compatible external clock signals to synchronize its internal oscillator. This feature enables precise interleaving with other UC3638QG3 devices or alignment with system timing references, reducing EMI in multi-phase power supplies and coordinated multi-axis motor drives.
What is the purpose of the separate SS1 and SS2 pins on the UC3638QG3?
The UC3638QG3 provides independent soft-start inputs SS1 and SS2 to control the ramp-up of each PWM channel separately. This allows staggered startup in dual-motor systems or phased enablement in redundant power stages. Each pin accepts a capacitor to generate a linear voltage ramp, which modulates the PWM duty cycle from zero until reaching full operating level.
Can the UC3638QG3 be used in a single-ended topology?
Yes, the UC3638QG3 can operate in single-ended mode by configuring only one channel (e.g., OUT1 active, OUT2 grounded) while retaining access to both error amplifiers for cascaded control. Its dual architecture does not require both outputs to be active, making it adaptable to forward, flyback, or boost converters where enhanced loop stability is needed.
What package type is used for the UC3638QG3 and what are its key mechanical features?
The UC3638QG3 uses a 20-pin PLCC (FN package) with J-leads, measuring 9.0 mm × 9.0 mm × 3.58 mm. It complies with JEDEC MS-018, has MSL Level-2 rating (260°C peak reflow), and uses Cu/Sn lead finish. Its center ground pad (Pin 11) improves thermal dissipation and noise immunity in high-current motor control layouts.
UC3638QG3 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 (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-PLCC (9x9)
UC3638QG3 FAQ
1.How can I place an order for UC3638QG3 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3638QG3 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 UC3638QG3 reliable?
The price and inventory of UC3638QG3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3638QG3 is usually 5 days.
3.What payment methods are accepted for UC3638QG3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3638QG3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3638QG3?
UC3638QG3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3638QG3 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 UC3638QG3?
For technical support, including UC3638QG3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3638QG3 requirements.
6.How does Aetrix verify that UC3638QG3 is sourced from the original manufacturer or authorized distributors?
All UC3638QG3 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 UC3638QG3 meets industry standards.
7.What is the process for return or replacement of UC3638QG3?
All UC3638QG3 units undergo pre-shipment inspection (PSI). If there is an issue with UC3638QG3, 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 UC3638QG3 part is unused and in its original packaging.
Return procedure for UC3638QG3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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