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Texas Instruments UC3625NG4
- Part No.:
- UC3625NG4
- Manufacturer:
- Texas Instruments
- Category:
- Motor Drivers, Controllers
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
UC3625NG4.pdf
- Description:
- IC MOTOR DRIVER 10V-18V 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,710
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Product details
Overview
UC3625NG4 from Texas Instruments is a brushless DC motor controller IC designed for fixed-frequency PWM voltage- or current-mode control of 3-phase BLDC motors. It integrates high-side (50-V open-collector) and low-side (push-pull) gate drivers, a high-speed current-sense amplifier with ideal diode, latched soft-start, tachometer output, and programmable cross-conduction protection. It operates across 0°C to +70°C and supports two- or four-quadrant operation in robotics and industrial motion systems.
For engineers reviewing the UC3625NG4 datasheet, UC3625NG4 pinout, UC3625NG4 application, or UC3625NG4 equivalent, key selection considerations include its 40–60 kHz oscillator frequency range, ±0.2 V peak-current threshold, 5 V trimmed reference, 50-V high-side driver capability, and direction latch with 25–50 µs deadtime for safe reversal - all critical for closed-loop speed control, braking, and noise-immune Hall-sensor commutation.
Technical Context
The UC3625NG4 implements a dedicated Hall-sensor position decoder with three hysteresis-comparator inputs (H1–H3), a direction latch synchronized to the PWM clock, and a shift register that enforces minimum 25 µs delay between direction changes. Its current-sense path includes differential inputs (ISENSE1/ISENSE2), fixed 2× gain, 2.5 V level shift, and dual comparators for pulse-by-pulse (0.20 V threshold) and average current sensing.
It features a programmable RC oscillator (RC-OSC pin) with frequency set by ROSC and COSC, a tachometer output (TACH-OUT) generating fixed-width pulses proportional to motor speed, and RC-BRAKE input enabling controlled braking via discharge timing (T ≈ 0.67·RT·CT). Cross-conduction prevention uses dual-cycle blanking on sensor inputs and flip-flop-based output inhibition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 40–60 kHz typical; sets PWM timing base and defines direction-change deadtime (25–50 µs). |
| Reference Voltage | 4.9–5.1 V at VREF; supplies stable 5 V for Hall sensors and internal circuitry before VCC enables. |
| Peak Current Threshold | 0.14–0.26 V at ISENSE; triggers pulse-by-pulse current limiting to protect power stage during transients. |
| High-Side Driver Voltage | 50 V open-collector rating; enables direct drive of P-channel MOSFETs or level-shifted N-channel devices. |
| Operating Temperature | 0°C to +70°C; commercial-grade specification suitable for embedded industrial and robotics applications. |
| Supply Voltage Range | 10 V to 18 V on VCC; under-voltage lockout disables outputs below 7.75 V to prevent weak drive. |
| Tachometer Pulse Width | 170–280 µs; provides deterministic timing for external speed filtering and feedback loop design. |
Pinout & Package
UC3625NG4 is packaged in a 28-pin SOIC (DW) with exposed thermal pad, pin-compatible with PLCC (Q) and LCC (L) variants per TI SLUS353C. All terminal functions are identical across packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (19) | Power supply input | 10–18 V main supply; powers internal logic and low-side drivers; bypass with 0.1 µF ceramic. |
| GND (15) | Ground reference | Common return for all analog/digital circuits; reference for all thresholds except PU/PD outputs. |
| H1–H3 (8,9,10) | Hall sensor inputs | TTL-compatible hysteresis comparators; decode 120°-spaced rotor position signals for commutation. |
| DIR (6) | Direction command | Latched input; prevents unsafe reversal until motor speed drops below ~250 mV at SPEED-IN. |
| PDA/PDB/PDC (12,13,14) | Low-side drivers | Push-pull outputs; sink up to 50 mA continuously; active-high to turn on N-channel MOSFETs/Darlingtons. |
| PUA/PUB/PUC (16,17,18) | High-side drivers | 50-V open-collector outputs; active-low to enable P-channel MOSFETs or level-shifted N-channel stages. |
| ISENSE1/ISENSE2 (3,4) | Differential current sense | Inputs to 2× gain amplifier with 2.5 V offset; support pulse-by-pulse or average current sensing topologies. |
| TACH-OUT (20) | Tachometer output | Open-drain pulse train; average voltage proportional to motor RPM; used for closed-loop speed control. |
Key Features
| Feature | Design Value |
|---|---|
| Latched soft-start | Prevents inrush current by clamping E/A OUT until SSTART capacitor charges; fault recovery requires full discharge. |
| Programmable cross-conduction protection | Two-cycle blanking on H1–H3 inputs plus flip-flop interlock ensures >25 µs separation between complementary PU/PD activations. |
| High-speed current-sense amplifier | 2× fixed gain with 2.5 V level shift enables accurate differential sensing of motor phase currents without external op amps. |
| Two- and four-quadrant operation | QUAD SEL (22) selects mode: two-quadrant improves efficiency in unidirectional loads; four-quadrant enables equal acceleration/deceleration control. |
| Brake mode via RC-BRAKE | Pulling RC-BRAKE (21) below 0.8–1.2 V disables tachometer and activates all low-side drivers while turning off high-side devices. |
Applications
| Industrial Robotics Arm Control | Automated Conveyor Speed Regulation |
|---|---|
|
Use Scenario: Precise torque and speed control of multi-axis robotic joints using Hall-effect position feedback and closed-loop current regulation. IC Role / Device Role / Timing Role: UC3625NG4 serves as the core commutation and PWM controller, decoding Hall signals, generating gated drive outputs, and enforcing cross-conduction safety timing. Use Value: Enables deterministic 25–50 µs direction-reversal deadtime and pulse-by-pulse current limiting to prevent MOSFET shoot-through during rapid joint repositioning. |
Use Scenario: Variable-speed drive for belt conveyors requiring smooth start/stop, overload protection, and tachometer-based speed feedback. IC Role / Device Role / Timing Role: UC3625NG4 acts as the motor controller, using TACH-OUT for RPM monitoring and OV-COAST for coast-to-stop transitions. Use Value: Delivers regulated 5 V (VREF) for Hall sensors and supports average current sensing (via RD resistor) to maintain consistent belt tension under varying load. |
| Medical Infusion Pump Motor Drive | Electric Actuator Position Servo |
|
Use Scenario: Low-noise, highly reliable BLDC drive for syringe advancement in infusion pumps where microstep precision and fail-safe braking are mandatory. IC Role / Device Role / Timing Role: UC3625NG4 provides latched soft-start, overvoltage/under-voltage protection, and RC-BRAKE-triggered controlled deceleration. Use Value: Ensures zero unintended motion during power-up/down and delivers repeatable brake response within 5–10 µs of RC-BRAKE assertion. |
Use Scenario: Closed-loop positioning system using BLDC motor with encoder-derived speed feedback and Hall-based commutation. IC Role / Device Role / Timing Role: UC3625NG4 functions as the real-time commutator and current regulator, interfacing with external PID controller via E/A IN(±) and PWM IN. Use Value: Supports four-quadrant chopping (QUAD SEL = high) for symmetrical torque delivery during both extension and retraction phases. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar brushless DC motor controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC2625N | Wider temperature range (–40°C to +105°C); otherwise functionally identical pinout and electrical specs. | Suitable for extended-temperature industrial environments where ambient exceeds 70°C. | Select UC2625N when operating in automotive under-hood or factory-floor enclosures with elevated ambient. |
| UC1625N | Military-grade temp range (–55°C to +125°C); same architecture but qualified for harsher thermal cycling and reliability testing. | Required for defense/aerospace systems or long-life industrial deployments demanding MIL-PRF-38535 compliance. | Choose UC1625N only if full military qualification and extended lifetime validation are contractually mandated. |
Compared with UC2625N and UC1625N, the UC3625NG4 offers identical functionality and pin compatibility but targets cost-sensitive commercial applications with lower thermal stress; its 0°C to +70°C rating simplifies thermal management and reduces BOM cost versus higher-grade variants.
Availability
UC3625NG4 is available at Aetrix Electronics and suitable for industrial robotics, automated conveyor systems, medical infusion pumps, and electric actuator designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for UC3625NG4 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 leader specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in industrial control ICs.
The UC3625NG4 belongs to TI's UCx625 family of brushless DC motor controllers, engineered specifically for robust, noise-immune commutation of 3-phase BLDC motors in cost-sensitive commercial motion-control applications.
FAQ
What is the maximum oscillator frequency supported by UC3625NG4?
The UC3625NG4 supports an oscillator frequency range of 35 kHz to 65 kHz, with typical operation at 40–60 kHz. This is set externally via ROSC (resistor to VREF) and COSC (capacitor to GND), using the formula F ≈ 2/(ROSC × COSC). Frequencies above 500 kHz are not recommended due to internal timing constraints and reduced noise immunity.
Does UC3625NG4 support both two-quadrant and four-quadrant motor control?
Yes, UC3625NG4 supports both modes via the QUAD SEL pin (pin 22). When low, it enables two-quadrant operation (high-side drivers remain on, low-side drivers chop), improving efficiency in unidirectional loads. When high, it enables four-quadrant operation (all drivers chop), delivering balanced acceleration and deceleration control essential for servo applications.
How does UC3625NG4 implement safe direction reversal?
The UC3625NG4 uses a direction latch synchronized to the PWM clock and a two-bit shift register. Direction changes are inhibited when SPEED-IN exceeds ~250 mV, ensuring reversal only occurs at low speed. The register enforces a minimum 25–50 µs delay between direction commands - one to two oscillator periods - preventing cross-conduction during commutation.
What is the purpose of the RC-BRAKE pin on UC3625NG4?
The RC-BRAKE pin (pin 21) serves dual functions: (1) timing the tachometer pulse width via RT/CT network (T ≈ 0.67·RT·CT), and (2) triggering active braking when pulled below 0.8–1.2 V. In brake mode, UC3625NG4 disables all high-side drivers (PUA/PUB/PUC), enables all low-side drivers (PDA/PDB/PDC), and halts tachometer output.
Can UC3625NG4 directly drive N-channel MOSFETs on the high side?
No, UC3625NG4's high-side drivers (PUA/PUB/PUC) are 50-V open-collector outputs designed for active-low operation - they sink current but cannot source gate voltage above the motor rail. To drive high-side N-channel MOSFETs, external level-shifting circuitry (e.g., charge pump, optocoupler, or transformer-isolated gate driver like UC3724/UC3725) is required.
UC3625NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- Brushless DC (BLDC)
- Function:
- Controller - Commutation, Direction Management
- Output Configuration:
- Pre-Driver - Half Bridge (3)
- Interface:
- Parallel
- Technology:
- Power MOSFET, Power Darlington
- Step Resolution:
- -
- Applications:
- General Purpose
- Current - Output:
- -
- Voltage - Supply:
- 10V ~ 18V
- Voltage - Load:
- -
- Operating Temperature:
- 0°C ~ 70°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-PDIP
UC3625NG4 FAQ
1.How can I place an order for UC3625NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3625NG4 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 UC3625NG4 reliable?
The price and inventory of UC3625NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3625NG4 is usually 5 days.
3.What payment methods are accepted for UC3625NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3625NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3625NG4?
UC3625NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3625NG4 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 UC3625NG4?
For technical support, including UC3625NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3625NG4 requirements.
6.How does Aetrix verify that UC3625NG4 is sourced from the original manufacturer or authorized distributors?
All UC3625NG4 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 UC3625NG4 meets industry standards.
7.What is the process for return or replacement of UC3625NG4?
All UC3625NG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC3625NG4, 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 UC3625NG4 part is unused and in its original packaging.
Return procedure for UC3625NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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