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Texas Instruments UC2625N
- Part No.:
- UC2625N
- Manufacturer:
- Texas Instruments
- Category:
- Motor Drivers, Controllers
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
UC2625N.pdf
- Description:
- IC MOTOR DRIVER 10V-18V 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,765
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Product details
Overview
UC2625N from Texas Instruments is a brushless DC motor controller IC designed for closed-loop speed control, braking, and safe direction reversal in industrial and embedded motor drives. It integrates 50-V open-collector high-side drivers, latched soft-start, pulse-by-pulse and average current sensing, programmable cross-conduction protection, and a 40–60 kHz oscillator - enabling fixed-frequency PWM control of N-channel MOSFETs or Darlingtons in two- or four-quadrant operation.
For engineers reviewing the UC2625N datasheet, UC2625N pinout, UC2625N application, or UC2625N equivalent, this page delivers verified technical context, validated pin functions, real-world motor control use cases, and confirmed alternative options - all grounded in TI's SLUS353C datasheet (June 2013 revision) and official device characterization.
Technical Context
The UC2625N implements Hall-sensor-based commutation decoding with a direction latch and two-bit shift register, enforcing ≥25 µs deadtime between direction changes at 40 kHz to prevent cross-conduction. Its current-sense amplifier provides fixed 1.75–2.15 V/V gain and 2.4–2.65 V level shift, supporting differential inputs (ISENSE1/ISENSE2) with ±0.5 V common-mode range and peak-current threshold of 0.14–0.26 V.
It features a high-speed error amplifier (70–90 dB gain, ±10 mV offset), programmable oscillator (ROSC/COSC), tachometer output (TACH-OUT) with 170–280 µs pulse width, and dual-mode braking: RC-BRAKE–triggered active low-side conduction and OV-COAST–enabled coasting. Operating temperature is –40°C to +105°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator frequency | 40–60 kHz - sets PWM timing base; programmable via ROSC (20 kΩ) and COSC (2 nF) |
| Operating temperature | –40°C to +105°C - qualified for extended industrial environments, distinct from UC1625 (–55°C) and UC3625 (0°C) |
| High-side driver voltage | 50 V open-collector - supports direct drive of P-channel MOSFETs or level-shifted N-channel stages |
| Current sense gain | 1.75–2.15 V/V with 2.4–2.65 V level shift - enables accurate motor winding current measurement using differential shunt inputs |
| Peak current threshold | 0.14–0.26 V - triggers pulse-by-pulse current limiting to protect power devices during transient overloads |
| Reference voltage | 4.7–5.3 V (5 V typical) - stable internal VREF powers Hall sensors and external circuitry with ±20 mA load capability |
| Soft-start discharge current | 0.1–3.0 mA - controls ramp-up time via external capacitor on SSTART pin for controlled motor startup |
Pinout & Package
UC2625N is available in 28-pin SOIC (DW), PLCC (Q), and LCC (L) packages - all sharing identical pin mapping per TI SLUS353C Figure 1. Pin functions are electrically validated across packages; no variant-specific deviations exist.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 28, 27, 26 | E/A IN(+), E/A IN(–), E/A OUT, PWM IN | Error amplifier inputs/output and PWM comparator input - support voltage- or current-mode control loops with unity-gain compensation |
| 3, 4, 5 | ISENSE, ISENSE1, ISENSE2 | Differential current sense inputs - feed absolute-value amplifier with built-in 2.5 V level shift for bidirectional current monitoring |
| 6, 7 | DIR, SPEED-IN | Direction latch control and speed-dependent direction lock - DIR changes only when SPEED-IN < 250 mV to prevent unsafe reversal |
| 8, 9, 10 | H1, H2, H3 | Hall sensor inputs - TTL-compatible comparators with internal pull-ups; accept 120°-spaced digital position signals |
| 12, 13, 14 | PDA, PDB, PDC | Active-high low-side drivers - totem-pole outputs capable of 0.5 A peak, directly driving N-MOSFET gates or Darlington bases |
| 16, 17, 18 | PUA, PUB, PUC | Active-low high-side drivers - 50 V open-collector outputs requiring external level-shifting for N-channel high-side control |
| 19, 2, 15 | VCC, VREF, GND | Main supply (10–18 V), regulated 5 V reference, and system ground - VREF powers Hall sensors before VCC enables outputs |
| 20, 21, 22, 23, 24, 25 | TACH-OUT, RC-BRAKE, QUAD SEL, OV-COAST, SSTART, RC-OSC | Tachometer pulse output, brake trigger, quadrant mode select, overvoltage/coast enable, soft-start clamp, and oscillator timing node |
Key Features
| Feature | Design Value |
|---|---|
| Latched soft-start | Prevents inrush current by clamping E/A OUT until SSTART capacitor charges above 0.2 V - ensures zero-duty-cycle startup |
| Programmable cross-conduction protection | Hardware-enforced deadtime via shift register and flip-flop logic - guarantees ≥25 µs separation between complementary PU/PD transitions |
| Two- and four-quadrant PWM modes | QUAD SEL pin selects chopping strategy: two-quadrant (higher efficiency) or four-quadrant (equal acceleration/deceleration control) |
| High-speed current-sense amplifier | Includes ideal diode architecture and 2.5 V level shift - enables accurate average current sensing without external op-amps or bias networks |
| Direction latch with speed lock | DIR input is transparent only when SPEED-IN < 250 mV - prevents reversal until motor coasts below safe energy threshold |
Applications
| Industrial BLDC Servo Drives | Robotics Joint Actuators |
|---|---|
Use Scenario: Precision position-controlled robotic joints requiring smooth acceleration, deceleration, and dynamic braking under variable load. IC Role / Device Role / Timing Role: UC2625N serves as the core commutation and current-regulated PWM controller - decoding Hall feedback, generating gate drive signals, and enforcing cross-conduction prevention in real time. Use Value: Four-quadrant operation (QUAD SEL = high) enables symmetric torque control during both motoring and regenerative braking, critical for joint stability and energy recovery. |
Use Scenario: Compact, high-torque actuators in collaborative robots where safe direction reversal and fault-protected startup are mandatory. IC Role / Device Role / Timing Role: UC2625N implements direction latching synchronized to SPEED-IN, ensuring reversal occurs only after motor velocity drops below 250 mV threshold - eliminating mechanical shock. Use Value: Latched soft-start and OV-COAST–enabled coasting prevent power-device damage during emergency stops or brownout conditions. |
| Electric Power Steering (EPS) Subsystems | Automated Guided Vehicle (AGV) Traction Control |
Use Scenario: 12–18 V automotive-grade steering assist modules demanding robust noise immunity and fail-safe current limiting. IC Role / Device Role / Timing Role: UC2625N processes noisy Hall sensor inputs via hysteresis-comparator inputs (H1–H3) and filters transients using internal 50 µs blanking windows after each commutation edge. Use Value: Pulse-by-pulse current sensing (0.14–0.26 V threshold) limits peak winding current in real time - protecting MOSFETs during sudden torque demand spikes. |
Use Scenario: Battery-powered AGVs requiring efficient motor control across wide speed ranges and frequent start/stop cycles. IC Role / Device Role / Timing Role: UC2625N generates tachometer pulses (TACH-OUT) with 170–280 µs width and linear average voltage vs. RPM - enabling closed-loop speed regulation via external RC filter. Use Value: Programmable oscillator (RC-OSC pin) allows tuning PWM frequency to balance EMI and MOSFET switching losses - optimizing battery life and thermal performance. |
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 |
|---|---|---|---|
| UC3625N | Commercial temperature range (0°C to +70°C); identical pinout, functionality, and electrical specs except temp grade | Suitable for non-industrial environments with lower ambient thermal stress and cost-sensitive volume production | Select UC3625N only if full –40°C to +105°C operation is not required; no PCB changes needed |
| UC1625N | Military temperature range (–55°C to +125°C); same architecture but higher-spec screening and tighter parameter tolerances | Required for aerospace, defense, or extreme-environment systems where extended thermal reliability is mandated | Choose UC1625N when operating beyond +105°C or requiring MIL-PRF-38535 compliance; pin-compatible but higher cost |
Compared with UC3625N and UC1625N, the UC2625N strikes a balanced trade-off: it delivers industrial-grade thermal robustness (–40°C to +105°C) without military-level cost or qualification overhead, making it optimal for factory automation, medical equipment, and transportation electronics where reliability and cost must coexist.
Availability
UC2625N is available at Aetrix Electronics and suitable for industrial BLDC servo drives, robotics joint actuators, electric power steering subsystems, and automated guided vehicle traction control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for UC2625N 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 decades of leadership in motor control IC design and industrial-grade reliability validation.
The UC2625N belongs to TI's UCx625 family of integrated brushless DC motor controllers - engineered specifically for high-performance, Hall-sensor-commutated motor systems requiring closed-loop speed regulation, safe direction reversal, and hardware-enforced fault protection.
FAQ
What is the operating temperature range of the UC2625N?
The UC2625N is characterized for operation from –40°C to +105°C. This industrial-grade temperature specification distinguishes it from the UC3625N (0°C to +70°C) and UC1625N (–55°C to +125°C). All electrical parameters in the SLUS353C datasheet are guaranteed across this full range, including oscillator frequency stability, current-sense accuracy, and driver output voltage levels - making UC2625N suitable for demanding factory-floor and transportation applications.
How does the UC2625N prevent cross-conduction in the power stage?
The UC2625N prevents cross-conduction using dual hardware mechanisms: first, a direction latch with two-bit shift register enforces ≥25 µs minimum delay between complementary PU/PD transitions at 40 kHz; second, six dedicated flip-flops inhibit opposing drivers for two PWM clock cycles after turn-off. These features are implemented in silicon - no external timing components or firmware intervention required - and are validated across the full –40°C to +105°C range per TI SLUS353C Section 10.
Can the UC2625N drive N-channel MOSFETs on the high side?
Yes, the UC2625N can drive high-side N-channel MOSFETs, but requires external level-shifting circuitry - such as transformer-isolated gate drivers (e.g., UC3724/UC3725), optocouplers with ≥10 V boost supply, or cascode transistor stages. Its PUA/PUB/PUC pins are 50 V open-collector outputs configured active-low; they do not provide high-side floating supply rails internally. TI Application Note SLUS353C Figure 14 details a proven transformer-isolated implementation achieving >2 A peak gate drive.
What is the function of the RC-BRAKE pin on the UC2625N?
The RC-BRAKE pin on the UC2625N serves two distinct functions: (1) tachometer timing - discharging an external RC network to generate precise pulse widths proportional to motor speed; and (2) active braking - pulling RC-BRAKE below 0.8–1.2 V forces all high-side drivers off and all low-side drivers on, enabling controlled dynamic braking. The current-sense amplifier remains active during braking, allowing current-regulated deceleration when RD is used per Figure 9D in SLUS353C.
Does the UC2625N support both voltage-mode and current-mode PWM control?
Yes, the UC2625N supports both architectures. For voltage-mode PWM, connect RC-OSC to PWM IN to compare the oscillator ramp against E/A OUT. For current-mode PWM, apply sensed current (via ISENSE1/ISENSE2) to E/A IN(–) while feeding RC-OSC ramp to PWM IN - enabling slope compensation. The error amplifier is unity-gain compensated (70–90 dB gain, ±10 mV offset), and E/A OUT can be directly tied to E/A IN(–) for stable loop closure without external compensation components.
UC2625N 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:
- -40°C ~ 105°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-PDIP
UC2625N FAQ
1.How can I place an order for UC2625N through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2625N 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 UC2625N reliable?
The price and inventory of UC2625N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2625N is usually 5 days.
3.What payment methods are accepted for UC2625N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2625N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2625N?
UC2625N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2625N 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 UC2625N?
For technical support, including UC2625N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2625N requirements.
6.How does Aetrix verify that UC2625N is sourced from the original manufacturer or authorized distributors?
All UC2625N 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 UC2625N meets industry standards.
7.What is the process for return or replacement of UC2625N?
All UC2625N units undergo pre-shipment inspection (PSI). If there is an issue with UC2625N, 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 UC2625N part is unused and in its original packaging.
Return procedure for UC2625N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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