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Texas Instruments UCC3626N
- Part No.:
- UCC3626N
- Manufacturer:
- Texas Instruments
- Category:
- Motor Drivers, Controllers
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
UCC3626N.pdf
- Description:
- IC MOTOR DRIVER 11V-14.5V 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,332
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Product details
Overview
UCC3626N from Texas Instruments is a three-phase brushless DC motor controller IC supporting two- and four-quadrant operation, featuring integrated absolute-value current sensing (gain = 5 V/V), precision tachometer output (variable duty-cycle, frequency-proportional), and synchronized triangle oscillator (9–11 kHz typical). It decodes Hall sensor inputs (HALLA/B/C) to drive six PWM outputs (AHI/ALOW/BHI/BLOW/CHI/CLOW) for external power stages in industrial motion control systems.
For engineers reviewing the UCC3626N datasheet, UCC3626N pinout, UCC3626N application, or UCC3626N equivalent, this device serves as a dedicated commutation and current-speed control engine for BLDC motors requiring precise rotor-position-based timing, pulse-by-pulse overcurrent protection, and configurable quadrant operation - especially where analog tach feedback, direction detection, and external MOSFET gate drive coordination are critical.
Technical Context
The UCC3626N implements Hall-input decoding into six complementary PWM outputs using a latched comparator and precision triangle oscillator, with selectable modulation mode (QUAD = 0 for low-side-only, QUAD = 1 for full H-bridge PWM). Its differential current-sense amplifier (SNS_I/SNS_NI) delivers IOUT = |5 × (ISNS_I − ISNS_NI)|, enabling both overcurrent protection and closed-loop current control.
It integrates a 5-V trimmed reference (±2% accuracy, 5 mA max), programmable tachometer monostable (on-time set by R_TACH/C_TACH), and direction logic that maps Hall transitions to DIR_OUT polarity matching DIR_IN during motoring. The oscillator supports external synchronization via SYNCH input with resistor-matching requirement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator frequency | 9–11 kHz typical (set by CT = 1 nF, R_TACH = 250 kΩ); enables stable PWM timing with <3% voltage sensitivity. |
| Current sense gain | 5.00 V/V (±1.5%); provides accurate motor phase current reconstruction for protection and analog current loop closure. |
| Tachometer output | Variable duty-cycle square wave; frequency ∝ motor RPM, on-time programmable via R_TACH/C_TACH for digital or analog speed feedback. |
| 5-V reference | 4.9–5.1 V at –2 mA load; ±2% initial accuracy, 10 mV line/load regulation; supplies bias for Hall sensors and external circuitry. |
| UVLO threshold | 10.5 V start, 0.4 V hysteresis; prevents erratic operation during brown-out and ensures clean power-up sequencing. |
| Output drive capability | ±200 mA per AHI/ALOW/BHI/BLOW/CHI/CLOW; directly interfaces with gate drivers (e.g., IR2110) without level-shifting buffers. |
| Operating temperature | 0°C to +70°C ambient; validated for commercial-grade motion control applications with thermal derating guidance. |
Pinout & Package
UCC3626N is housed in a 28-pin plastic dual in-line package (PDIP-N), with 0.6-inch body width and standard through-hole mounting. Pin 1 is located at bottom-left corner when notch faces up; pin numbering follows counter-clockwise sequence.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Reference ground | Common return for all internal circuits; requires local 0.1 µF ceramic bypass to minimize noise coupling into oscillator and current sense paths. |
| VREF (Pin 2) | 5-V precision reference output | Stable 5-V source for Hall sensor pull-ups and external analog circuitry; must be bypassed with ≥0.1 µF ceramic capacitor. |
| TACH_OUT (Pin 3) | Tachometer output | Open-collector variable-duty-cycle signal; frequency proportional to motor speed; used for digital counting or RC-filtered analog velocity feedback. |
| R_TACH (Pin 4) | Tachometer timing resistor connection | Sets charge current for C_TACH; programs tach monostable on-time (tON = R_TACH × C_TACH). |
| C_TACH (Pin 5) | Tachometer timing capacitor connection | Charged by current from R_TACH; determines TACH_OUT pulse width; must connect directly to GND (Pin 1) for jitter-free operation. |
| CT (Pin 6) | Oscillator timing capacitor connection | Forms triangle waveform (2.5–7.5 V swing); sets PWM frequency with R_TACH; requires direct GND tie and minimal trace length. |
| SYNCH (Pin 7) | External oscillator sync input | Positive-edge-triggered; forces CT discharge; requires parallel resistor equal to R_TACH when enabled; must be grounded if unused. |
| DIR_OUT (Pin 8) | Direction indicator output | Logic-level signal indicating actual rotor rotation direction (CW/CCW); matches DIR_IN polarity during motoring; open-drain structure. |
| SNS_NI (Pin 9) | Current sense amplifier non-inverting input | Accepts one side of bidirectional shunt voltage; paired with SNS_I to generate absolute-value current output (IOUT). |
| SNS_I (Pin 10) | Current sense amplifier inverting input | Accepts opposite side of shunt; differential input pair enables rejection of common-mode noise in high-side or low-side sensing. |
| IOUT (Pin 11) | Reconstructed current output | Analog voltage = |5 × (SNS_I − SNS_NI)|; used for overcurrent shutdown or inner current control loop; requires low-pass filtering for clean feedback. |
| OC_REF (Pin 12) | Overcurrent trip threshold | Analog input setting comparator threshold; referenced to IOUT; enables programmable current limit independent of shunt value. |
| PWM_I (Pin 13) | PWM comparator inverting input | Accepts current or voltage error signal; compared against triangle waveform on CT to generate PWM duty cycle. |
| PWM_NI (Pin 14) | PWM comparator non-inverting input | Accepts triangle waveform from CT; establishes fixed ramp for duty-cycle generation in voltage-mode control. |
| VDD (Pin 15) | Power supply input | 12 V nominal (9–15 V range); includes UVLO; requires ≥0.1 µF ceramic bypass near pin to suppress switching transients. |
| AHI (Pin 16) | Phase A high-side driver output | Active-high digital output controlling external high-side switch (e.g., N-channel MOSFET gate via driver); part of Hall-decoded commutation sequence. |
| ALOW (Pin 17) | Phase A low-side driver output | Complementary to AHI in four-quadrant mode; modulated during PWM off-time in two-quadrant mode for controlled flyback. |
| BHI (Pin 18) | Phase B high-side driver output | One of six decoded outputs; timing determined by HALLA/HALLB/HALLC state and DIR_IN; synchronized to oscillator. |
| BLOW (Pin 19) | Phase B low-side driver output | Enables low-side conduction during freewheeling; critical for brake mode (all LOW active) and current path control in reversal. |
| CHI (Pin 20) | Phase C high-side driver output | Completes three-phase high-side set; transitions follow 120° Hall code; disabled during COAST or UVLO conditions. |
| CLOW (Pin 21) | Phase C low-side driver output | Provides third low-side control; participates in synchronous rectification during PWM off-time in four-quadrant operation. |
| DIR_IN (Pin 22) | Direction command input | Logic-level input selecting forward/reverse commutation order; determines mapping between Hall states and AHI/ALOW/etc. outputs. |
| QUAD (Pin 23) | Quadrant selection input | High = four-quadrant (both high/low sides PWM-modulated); Low = two-quadrant (only low sides modulated); configures power stage behavior. |
| BRAKE (Pin 24) | Brake command input | Active-high signal forcing all low-side outputs ON and all high-side outputs OFF; maintains tach output during braking. |
| COAST (Pin 25) | Coast command input | Hysteretic comparator input (>1.75 V disables all outputs); used for bus overvoltage clamping in regenerative four-quadrant systems. |
| HALLC (Pin 26) | Rotor position sensor input C | One of three 120°-spaced Hall inputs; accepts 1.7–2.1 V logic-high; requires external pull-up to VREF or 5 V; filtered per Figure 2. |
| HALLB (Pin 27) | Rotor position sensor input B | Second Hall input; same electrical specs as HALLC; transitions trigger tach monostable and update commutation state machine. |
| HALLA (Pin 28) | Rotor position sensor input A | First Hall input; initiates decode table lookup; combined with HALLB/HALLC determines which of six output states is active. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Hall decoder with direction logic | Maps 120° Hall inputs to six-phase commutation outputs and generates DIR_OUT matching mechanical rotation direction. |
| Four-quadrant PWM control mode | Enables controlled torque reversal (quadrants II/IV) by modulating both high- and low-side switches, eliminating uncontrolled circulating currents. |
| Dual-mode current sensing | Combines differential amplifier (5× gain) and absolute-value circuit to reconstruct true motor current magnitude regardless of direction or PWM polarity. |
| Programmable tachometer with monostable | Generates speed-proportional variable-duty-cycle output; on-time independently adjustable via R_TACH/C_TACH for optimal digital or analog loop response. |
| Synchronized oscillator architecture | Supports master-slave clock alignment via SYNCH pin; requires matched R_TACH parallel resistor; reduces system EMI in multi-controller setups. |
| Configurable braking and coasting | BRAKE forces low-side conduction for dynamic braking; COAST disables outputs for freewheeling; both preserve tach functionality for speed monitoring. |
Applications
| Industrial Servo Drives | Medical Infusion Pumps |
|---|---|
|
Use Scenario: Closed-loop speed and torque control of 3-phase BLDC motors in CNC axes and robotic joints, operating across 0–5000 RPM with ±2% speed regulation. IC Role / Device Role / Timing Role: Primary commutation controller decoding Hall signals, generating six-phase PWM, managing tach feedback, and enforcing current limits. Use Value: Enables deterministic 120° commutation timing, eliminates need for external current reconstruction circuitry, and supports real-time overcurrent shutdown within 175 ns. |
Use Scenario: Precision fluid delivery in hospital-grade infusion pumps requiring silent, vibration-free motor operation and fail-safe stall detection. IC Role / Device Role / Timing Role: Motor controller providing smooth microstepped-like velocity profiles via analog tach filtering and sign/magnitude current control. Use Value: Delivers <1% speed ripple at low RPM using filtered TACH_OUT feedback and supports BRAKE/COAST commands for emergency stop and free-run modes. |
| Automated Guided Vehicles (AGVs) | Lab Automation Platforms |
|
Use Scenario: Bidirectional traction motor control in battery-powered AGVs navigating warehouse floors, requiring regenerative braking and directional reversal. IC Role / Device Role / Timing Role: Four-quadrant controller coordinating high/low-side PWM, direction detection (DIR_OUT), and tach-based velocity loop closure. Use Value: Supports safe, controlled deceleration in quadrants II/IV using full-bridge PWM, avoids destructive flyback currents, and maintains tach output during brake events. |
Use Scenario: High-accuracy sample positioning in DNA sequencers and ELISA readers, demanding repeatable sub-RPM motor control and low EMI. IC Role / Device Role / Timing Role: Core timing and commutation engine synchronizing Hall decoding, oscillator, and tach monostable to enable <0.1 RPM resolution. Use Value: Provides jitter-free CT triangle waveform (<100 ns rise/fall), enables precise tach period measurement, and integrates 5-V reference for sensor biasing. |
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 |
|---|---|---|---|
| UCC2626N | Same architecture and pinout; rated for –40°C to +85°C industrial temperature range vs. UCC3626N's 0°C to +70°C commercial range. | Preferred for extended-temperature environments (e.g., outdoor equipment, factory floors); shares identical functional blocks and timing specs. | Select UCC2626N when operating outside 0–70°C; verify thermal margin for PCB layout and power dissipation. |
| MC33035 | 5-V supply only; no integrated tach monostable or absolute-value amplifier; requires external components for current reconstruction and speed feedback. | Used in cost-sensitive, lower-performance BLDC systems where analog tach or precise current magnitude isn't required. | Choose MC33035 only if tach output and absolute current sensing are omitted from design; expect added BOM count and calibration effort. |
Compared with UCC2626N, the UCC3626N trades extended temperature range for lower cost and commercial qualification, while MC33035 lacks integrated tach and absolute-value functions - making UCC3626N the optimal choice for compact, self-contained velocity-current control in ambient-stable environments.
Availability
UCC3626N is available at Aetrix Electronics and suitable for industrial servo drives, medical infusion pumps, automated guided vehicles, and lab automation platforms requiring stable component supply, long-term obsolescence management, and consistent parametric performance across production batches.
Supply support for UCC3626N 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 expertise in motor control ICs and industrial interface solutions.
The UCC3626N belongs to TI's legacy motor controller product line, designed specifically for three-phase brushless DC commutation with integrated Hall decoding, current sensing, and tach feedback - targeting cost-effective, high-reliability motion systems.
FAQ
What is the operating temperature range for the UCC3626N?
The UCC3626N is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade rating makes it suitable for indoor industrial equipment, medical devices, and laboratory instruments where environmental conditions remain thermally stable. Derating guidelines are provided in the datasheet for sustained high-power operation.
Does the UCC3626N support both two- and four-quadrant motor control?
Yes, the UCC3626N supports both modes via the QUAD input pin: logic low selects two-quadrant operation (PWM applied only to low-side outputs), while logic high enables four-quadrant control (PWM applied to both high- and low-side outputs). This allows controlled torque reversal and regenerative braking without external logic.
How is the tachometer output of the UCC3626N configured and used?
The UCC3626N tachometer generates a variable-duty-cycle square wave on TACH_OUT whose frequency is proportional to motor speed. Its on-time is set by R_TACH and C_TACH (tON = R_TACH × C_TACH), and it can be used directly for microcontroller-based speed counting or low-pass filtered for analog velocity feedback in closed-loop systems.
What is the function of the IOUT pin on the UCC3626N?
The IOUT pin on the UCC3626N delivers an analog voltage equal to the absolute value of five times the differential input voltage across SNS_I and SNS_NI (IOUT = |5 × (SNS_I − SNS_NI)|). This reconstructed current signal supports overcurrent protection, inner current loop closure, and diagnostic monitoring without external amplification.
Can the UCC3626N oscillator be synchronized to an external clock?
Yes, the UCC3626N oscillator can be synchronized using the SYNCH input pin. A positive-going edge on SYNCH forces the CT capacitor to begin discharging. For reliable synchronization, the slave oscillator must be programmed for a slightly lower frequency than the master, and a resistor equal to R_TACH must be placed in parallel with CT.
UCC3626N 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:
- PWM
- Technology:
- -
- Step Resolution:
- -
- Applications:
- General Purpose
- Current - Output:
- -
- Voltage - Supply:
- 11V ~ 14.5V
- Voltage - Load:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-PDIP
UCC3626N FAQ
1.How can I place an order for UCC3626N through Aetrix?
Please submit a Request for Quotation (RFQ) for UCC3626N 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 UCC3626N reliable?
The price and inventory of UCC3626N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UCC3626N is usually 5 days.
3.What payment methods are accepted for UCC3626N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UCC3626N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UCC3626N?
UCC3626N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UCC3626N 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 UCC3626N?
For technical support, including UCC3626N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UCC3626N requirements.
6.How does Aetrix verify that UCC3626N is sourced from the original manufacturer or authorized distributors?
All UCC3626N 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 UCC3626N meets industry standards.
7.What is the process for return or replacement of UCC3626N?
All UCC3626N units undergo pre-shipment inspection (PSI). If there is an issue with UCC3626N, 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 UCC3626N part is unused and in its original packaging.
Return procedure for UCC3626N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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