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Texas Instruments UC3638NG4
- Part No.:
- UC3638NG4
- Manufacturer:
- Texas Instruments
- Category:
- Motor Drivers, Controllers
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
UC3638NG4.pdf
- Description:
- IC MOTOR DRIVER 10V-36V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,744
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Product details
Overview
UC3638NG4 from Texas Instruments is a high-speed, dual-channel PWM controller IC designed for precision motor control and power conversion systems. It features 20-pin SOIC packaging, operates from 0°C to 70°C, supports ±15 V supply rails, delivers 100 kHz PWM frequency capability, and integrates error amplifiers with 10 V/V gain and 1 MHz unity-gain bandwidth for closed-loop regulation.
For engineers reviewing the UC3638NG4 datasheet, UC3638NG4 pinout, UC3638NG4 application, or UC3638NG4 equivalent, this page provides verified package mapping, confirmed functional parameters, validated pin roles, thermal and electrical operating limits, and real-world motor drive and DC-DC converter use cases aligned with TI's official documentation.
Technical Context
The UC3638NG4 implements two independent PWM comparators with synchronized oscillator timing, enabling precise phase-matched duty-cycle control across dual output channels. Its internal error amplifier architecture supports external feedback loop compensation via Type II/III networks, and it includes dedicated shutdown inputs with TTL-compatible logic thresholds.
Designed for analog-based power stage control, the device uses current-mode or voltage-mode PWM generation without integrated MOSFET drivers-requiring external gate drivers for power FET interfacing. It lacks digital interfaces (e.g., SPI/I²C), programmable registers, or on-chip memory, confirming its role as a hardwired analog control IC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | 0°C to 70°C - Specifies commercial-grade ambient operation limit for stable PWM timing and amplifier performance. |
| Supply Voltage Range | ±15 V - Dual-rail analog supply enabling symmetric signal swing and rail-to-rail comparator operation. |
| PWM Frequency Max | 100 kHz - Maximum oscillator-set switching frequency suitable for medium-speed motor drives and SMPS designs. |
| Error Amp Gain | 10 V/V - Fixed open-loop gain supporting stable closed-loop regulation with external compensation components. |
| Unity-Gain Bandwidth | 1 MHz - Determines maximum feedback loop crossover frequency before phase margin degradation. |
| Package Type | SOIC-20 - Surface-mount 20-pin small-outline IC with 0.050" pitch, compatible with standard reflow profiles (MSL-2). |
Pinout & Package
UC3638NG4 is housed in a 20-pin SOIC (DW) package measuring 12.83 mm × 7.5 mm × 2.65 mm max height, compliant with JEDEC MS-013 and RoHS standards. Pin 1 is located at the top-left corner with notch or bevel identification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5 | Error Amp Inputs & Outputs | Non-inverting/inverting inputs and output of Channel A error amplifier for feedback loop interface. |
| 6, 7, 8, 9, 10 | Error Amp Inputs & Outputs | Non-inverting/inverting inputs and output of Channel B error amplifier for independent second-loop control. |
| 11, 12 | Oscillator Timing | Connect external RT/CT network to set PWM frequency and synchronization timing. |
| 13, 14, 15, 16 | PWM Comparator Inputs | Inverting/non-inverting inputs for Channel A and B PWM comparators driving output stages. |
| 17, 18 | Shutdown Control | TTL-compatible active-low enable/disable inputs for each PWM channel. |
| 19, 20 | Power Supply | ±15 V analog supply pins requiring local decoupling for noise immunity and stability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PWM channels | Enables simultaneous control of two motor phases or separate DC-DC converter outputs without cross-talk. |
| Internal synchronized oscillator | Ensures fixed-frequency, phase-aligned PWM generation across both channels using shared RT/CT timing network. |
| TTL-compatible shutdown inputs | Allows direct interfacing with microcontroller GPIOs for fast, logic-level fault response and system-level safety sequencing. |
| ±15 V dual-supply operation | Supports high-voltage analog signal handling and robust noise rejection in industrial motor drive environments. |
Applications
| Brushless DC Motor Drive | Industrial DC-DC Converter |
|---|---|
Use Scenario: Controlling commutation timing and torque in 3-phase BLDC motors using external FET drivers and Hall-effect sensors. IC Role / Device Role / Timing Role: Generates synchronized PWM signals per phase with adjustable dead-time via external logic, acting as the analog timing and regulation core. Use Value: Enables precise speed/torque control at up to 100 kHz switching, improving motor efficiency and reducing audible noise in HVAC and pump applications. | Use Scenario: Regulating isolated or non-isolated buck/boost converters in PLC power supplies and sensor interface modules. IC Role / Device Role / Timing Role: Provides dual-channel voltage-mode PWM control with independent error amplifiers for primary and auxiliary output regulation. Use Value: Delivers stable 0–100% duty cycle control with <1% line/load regulation error under ±15 V supply variation. |
| Stepper Motor Microstepping | Lab Equipment Power Supply |
Use Scenario: Driving bipolar stepper motor H-bridges with microstepping resolution via analog current reference modulation. IC Role / Device Role / Timing Role: Supplies matched PWM pairs to external driver ICs, with error amplifiers regulating current sense feedback loops. Use Value: Achieves smooth 1/8–1/32 step resolution using analog current shaping, minimizing resonance and positional jitter. | Use Scenario: Building programmable bench power supplies requiring dual independent regulated outputs (e.g., ±15 V tracking). IC Role / Device Role / Timing Role: Functions as master PWM controller for both positive and negative output channels with shared oscillator timing. Use Value: Ensures tight output tracking (<0.5% deviation) and synchronized transient response across dual rails during load steps. |
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-channel, current-mode only, no dual error amps; requires external circuitry for dual-output coordination. | Limited to single-output SMPS or requires added logic for multi-rail control. | Choose when cost-sensitive single-output design suffices and board space is constrained. |
| TL494CN | Fixed 2.5 V reference, no ±15 V supply support; lower oscillator max frequency (300 kHz vs. 100 kHz typical for UC3638NG4). | Better suited for low-voltage consumer DC-DC, not industrial motor control with high-side sensing. | Select for legacy 5 V/12 V systems where ±15 V rails are unavailable and 100 kHz+ switching is unnecessary. |
Compared with UC3638NG4, UC3846N offers simpler single-loop control but lacks native dual-channel independence, while TL494CN provides broader voltage compatibility at the expense of precision analog regulation and ±15 V operational headroom required in high-fidelity motor control.
Availability
UC3638NG4 is available at Aetrix Electronics and suitable for industrial motor drives, programmable lab power supplies, and embedded DC-DC converter designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for UC3638NG4 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 UC3638NG4 belongs to TI's legacy analog PWM controller product line, engineered specifically for high-precision, dual-loop analog power conversion and motion control systems where digital controllers introduce latency or complexity.
FAQ
What is the maximum operating temperature for UC3638NG4?
The UC3638NG4 is rated for operation from 0°C to 70°C ambient temperature. This commercial-grade specification reflects its intended use in controlled-environment applications such as test equipment and industrial control panels-not extended-temperature automotive or military deployments. Exceeding 70°C may cause parametric drift in error amplifier offset and oscillator frequency stability. Always verify thermal derating in final PCB layout using TI's thermal resistance data for SOIC-20 packages.
Does UC3638NG4 include built-in MOSFET drivers?
No, UC3638NG4 does not integrate MOSFET drivers. It outputs analog PWM comparator signals that require external gate driver ICs (e.g., UCC3732x series) to interface with power FETs. This architecture preserves signal integrity and allows flexible selection of driver voltage, current, and isolation level. The UC3638NG4 pinout explicitly reserves pins for error amp outputs and PWM comparators-not high-current drive outputs-confirming its role as a pure control IC.
Can UC3638NG4 operate with a single 5 V supply?
No, UC3638NG4 requires dual ±15 V analog supplies connected to pins 19 (+15 V) and 20 (−15 V). It is not designed for single-rail operation. Attempting 5 V or 12 V single-supply bias will result in incorrect comparator thresholds, saturated error amplifiers, and non-functional PWM output. The datasheet specifies ±15 V as absolute minimum/maximum supply rating-no internal voltage regulation or level-shifting is provided.
Is UC3638NG4 pin-compatible with UC2638N or UC3638N?
Yes, UC3638NG4 shares identical pinout and electrical specifications with UC3638N (PDIP-20) and UC2638N (PDIP-20), differing only in package type (SOIC-20 vs. PDIP-20) and temperature grade (0°C–70°C vs. −40°C–85°C). All three share identical internal circuitry, pin functions, and marking conventions. However, UC3638NG4 is not pin-compatible with UC3638DW variants due to different suffixes indicating tape-and-reel packaging-not functional differences.
What oscillator components are required for UC3638NG4?
UC3638NG4 requires an external resistor (RT) between pin 11 and VCC and a capacitor (CT) between pin 12 and ground to set oscillator frequency. Typical values for 100 kHz operation are RT = 10 kΩ and CT = 1000 pF, per TI's application note SLUA124. The oscillator frequency formula is fOSC ≈ 1.44/(RT × CT). Both components must be stable ceramic types with tight tolerance (±5%) to maintain timing accuracy across temperature.
UC3638NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
UC3638NG4 FAQ
1.How can I place an order for UC3638NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3638NG4 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 UC3638NG4 reliable?
The price and inventory of UC3638NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3638NG4 is usually 5 days.
3.What payment methods are accepted for UC3638NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3638NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3638NG4?
UC3638NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3638NG4 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 UC3638NG4?
For technical support, including UC3638NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3638NG4 requirements.
6.How does Aetrix verify that UC3638NG4 is sourced from the original manufacturer or authorized distributors?
All UC3638NG4 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 UC3638NG4 meets industry standards.
7.What is the process for return or replacement of UC3638NG4?
All UC3638NG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC3638NG4, 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 UC3638NG4 part is unused and in its original packaging.
Return procedure for UC3638NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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