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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

Texas Instruments UC3625Q

Name: UC3625Q
Brand: Texas Instruments
SKU: UC3625Q
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: UC3625Q

Manufacturer:: Texas Instruments

Category:: Motor Drivers, Controllers

Package:: 28-LCC (J-Lead)

Datasheet:: UC3625Q.pdf

Description:: IC MOTOR DRIVER 10V-18V 28PLCC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

UC3625Q 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) 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 UC3625Q datasheet, UC3625Q pinout, UC3625Q application, or UC3625Q equivalent, this page delivers verified technical context, confirmed pin functions, real-world motor control use cases, and validated alternative options - all grounded in TI's SLUS353C datasheet and official package documentation for the PLCC-28 (Q) variant.

Technical Context

The UC3625Q implements closed-loop speed control using Hall-effect sensor inputs (H1–H3), direction-latched commutation logic, and a 40–60 kHz RC oscillator (set via ROSC/COSC). Its dual current sensing path supports both pulse-by-pulse (via ISENSE1/ISENSE2 differential input) and average current measurement (with external RD resistor in four-quadrant mode).

Cross-conduction prevention uses dual-stage timing: a two-cycle PWM blanking window after each Hall transition plus flip-flop-based output inhibition ensuring minimum 25 µs dead time between complementary PU/PD driver activation. Brake mode is triggered by RC-BRAKE < 1.0 V, forcing all PUs off and all PDs on while disabling tachometer output.

Key Specifications

Parameter	Value and Actual Design Meaning
Oscillator frequency	40–60 kHz (TYP 50 kHz); set externally via ROSC=20 kΩ to VREF and COSC=2 nF - determines PWM switching rate and commutation timing resolution.
Operating temperature	0°C to +70°C - defines commercial-grade thermal envelope for embedded motor drives without extended environmental hardening.
High-side drive	50-V open-collector outputs (PUA/PUB/PUC); active-low, capable of sinking 50 mA - enables direct interface to P-channel MOSFETs or level-shifted N-channel gate drivers.
Low-side drive	Push-pull outputs (PDA/PDB/PDC); active-high, 50 mA sink/source - directly drives N-channel MOSFET gates or Darlingtons without external buffers.
Current sense gain	1.95 V/V (TYP); includes 2.5 V level shift - converts ±0.5 V differential input (ISENSE1–ISENSE2) into 0–3.5 V ISENSE output for peak-current limiting at ~0.2 V/RSENSE.
Reference voltage	5.0 V ±2% (TYP); 30 mA max load - powers Hall sensors and provides stable bias for ROSC, SSTART, and CTACH timing networks.
Tachometer output	5 V CMOS-compatible pulse train (170–280 µs ON time); average voltage proportional to motor speed - enables analog speed feedback without external ADC.

Pinout & Package

UC3625Q is packaged in a 28-pin PLCC (Plastic Leaded Chip Carrier) with gull-wing leads, pin-compatible across UC1625/UC2625/UC3625 family variants. The Q suffix explicitly denotes this PLCC-28 package per TI's device nomenclature.

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-mode (RC-OSC → PWM IN) or current-mode (ISENSE → E/A IN(–)) control loops with unity-gain compensation.
3, 4, 5	ISENSE, ISENSE1, ISENSE2	Differential current sense inputs with 2.5 V level shift - enable bidirectional winding current monitoring for pulse-by-pulse or average current regulation.
6, 7	DIR, SPEED-IN	Direction latch input and speed threshold detector - DIR changes are gated until SPEED-IN < 250 mV, preventing unsafe reversal during coast-down.
8, 9, 10	H1, H2, H3	Hall-effect sensor inputs with TTL-compatible thresholds and internal pull-ups - decode 120°-spaced rotor position for electronic commutation.
12, 13, 14	PDA, PDB, PDC	Active-high low-side drivers - directly switch N-MOSFETs or NPN Darlingtons; rated for 50 mA continuous, 500 mA peak.
16, 17, 18	PUA, PUB, PUC	Active-low high-side open-collector drivers - interface to P-MOSFETs, PNP Darlingtons, or isolated gate drivers; withstand 50 V, sink 50 mA.
19, 2, 15	VCC, VREF, GND	Main supply (10–18 V), regulated 5 V reference, and ground - VREF powers Hall sensors before VCC enables outputs, ensuring safe startup sequencing.
20, 21, 22, 23, 24, 25	TACH-OUT, RC-BRAKE, QUAD SEL, OV-COAST, SSTART, RC-OSC	Tachometer pulse output; brake trigger input; two-/four-quadrant mode select; overvoltage/coast command; soft-start clamp; oscillator timing node - configure braking, commutation mode, fault response, and timing.

Key Features

Feature	Design Value
Latched direction reversal	Prevents unsafe motor reversal by holding DIR input until SPEED-IN falls below 250 mV - eliminates cross-conduction risk during deceleration.
Programmable cross-conduction protection	Two-stage hardware blanking: Hall-input latching for 50 µs + flip-flop output inhibition ensures ≥25 µs guaranteed dead time between PU/PD activation.
Integrated current sensing	Fixed-gain (1.95×), level-shifted (2.5 V) amplifier accepts ±0.5 V differential input - enables accurate peak-current limiting without external op-amps or level-shifting circuitry.
Four-quadrant operation	QUAD SEL pin enables simultaneous chopping of all six drivers - delivers equal acceleration/deceleration control essential for servo positioning accuracy.
Brake mode with current control	RC-BRAKE < 1.0 V forces all PUs off and all PDs on while retaining PWM comparator action - allows controlled regenerative or dynamic braking when ISENSE reflects braking current.

Applications

Industrial Robotics Arm	Automated Conveyor Drive
Use Scenario: Precise torque-controlled joint actuation in multi-axis robotic arms requiring smooth acceleration, deceleration, and direction reversal. IC Role / Device Role / Timing Role: UC3625Q serves as the core commutation and current-regulation controller, interpreting Hall signals to sequence six power drivers while enforcing 25 µs cross-conduction guard bands. Use Value: Four-quadrant mode (QUAD SEL = high) enables symmetric current control during both motoring and regenerative braking, improving positional repeatability and reducing mechanical stress.	Use Scenario: Variable-speed belt conveyor in packaging lines needing reliable start/stop, overload protection, and speed feedback for PLC integration. IC Role / Device Role / Timing Role: UC3625Q acts as the motor interface IC, converting PLC speed commands (via PWM IN or E/A IN) into timed gate pulses while monitoring ISENSE for stall detection. Use Value: TACH-OUT provides analog speed feedback to the PLC; OV-COAST input enables immediate coast-to-stop on emergency signal, meeting functional safety requirements.
Medical Infusion Pump	Electric Power Steering (EPS) Assist Module
Use Scenario: Low-noise, high-reliability micro-motor control in portable infusion pumps where precise flow rate and fail-safe shutdown are critical. IC Role / Device Role / Timing Role: UC3625Q manages BLDC commutation and current limiting (via ISENSE1/ISENSE2) while its latched soft-start (SSTART) prevents inrush current during power-up. Use Value: Over-voltage/under-voltage protection disables outputs if supply drifts outside 8.65–9.45 V turn-on window, preventing erratic motor behavior during battery sag.	Use Scenario: Compact, thermally constrained assist motor control in automotive EPS systems requiring robust noise immunity and directional safety. IC Role / Device Role / Timing Role: UC3625Q processes Hall sensor inputs (H1–H3) and torque-sensor-derived DIR/SPEED-IN signals to generate phase-commutated gate drives with direction-latch gating. Use Value: Direction latch + SPEED-IN threshold ensures assist torque reverses only after vehicle speed drops below safe threshold, eliminating jolt during low-speed maneuvers.

Industrial Robotics Arm

Automated Conveyor Drive

Use Scenario: Precise torque-controlled joint actuation in multi-axis robotic arms requiring smooth acceleration, deceleration, and direction reversal.

IC Role / Device Role / Timing Role: UC3625Q serves as the core commutation and current-regulation controller, interpreting Hall signals to sequence six power drivers while enforcing 25 µs cross-conduction guard bands.

Use Value: Four-quadrant mode (QUAD SEL = high) enables symmetric current control during both motoring and regenerative braking, improving positional repeatability and reducing mechanical stress.

Use Scenario: Variable-speed belt conveyor in packaging lines needing reliable start/stop, overload protection, and speed feedback for PLC integration.

IC Role / Device Role / Timing Role: UC3625Q acts as the motor interface IC, converting PLC speed commands (via PWM IN or E/A IN) into timed gate pulses while monitoring ISENSE for stall detection.

Use Value: TACH-OUT provides analog speed feedback to the PLC; OV-COAST input enables immediate coast-to-stop on emergency signal, meeting functional safety requirements.

Medical Infusion Pump

Electric Power Steering (EPS) Assist Module

Use Scenario: Low-noise, high-reliability micro-motor control in portable infusion pumps where precise flow rate and fail-safe shutdown are critical.

IC Role / Device Role / Timing Role: UC3625Q manages BLDC commutation and current limiting (via ISENSE1/ISENSE2) while its latched soft-start (SSTART) prevents inrush current during power-up.

Use Value: Over-voltage/under-voltage protection disables outputs if supply drifts outside 8.65–9.45 V turn-on window, preventing erratic motor behavior during battery sag.

Use Scenario: Compact, thermally constrained assist motor control in automotive EPS systems requiring robust noise immunity and directional safety.

IC Role / Device Role / Timing Role: UC3625Q processes Hall sensor inputs (H1–H3) and torque-sensor-derived DIR/SPEED-IN signals to generate phase-commutated gate drives with direction-latch gating.

Use Value: Direction latch + SPEED-IN threshold ensures assist torque reverses only after vehicle speed drops below safe threshold, eliminating jolt during low-speed maneuvers.

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
UC2625Q	Wider temperature range (–40°C to +105°C); identical pinout, electrical specs, and feature set.	Suitable for industrial environments with extended thermal cycling or uncontrolled ambient conditions.	Select UC2625Q when operating beyond 0°C–70°C, especially in factory automation or outdoor equipment.
MP6532GQ-Z	Monolithic 3-phase gate driver (no integrated error amp, oscillator, or Hall decoder); requires external MCU for commutation logic.	Used in designs where microcontroller-based field-oriented control (FOC) replaces Hall-based trapezoidal control.	Choose MP6532GQ-Z only when migrating to FOC architecture and accepting added software complexity for higher efficiency.

Compared with UC2625Q, the UC3625Q trades extended temperature capability for lower cost and simpler qualification in commercial-grade systems; compared with MP6532GQ-Z, it delivers full Hall-commutated control in one IC but lacks FOC flexibility and integrated current-sense ADC.

Availability

UC3625Q is available at Aetrix Electronics and suitable for industrial robotics, automated conveyors, medical infusion pumps, and electric power steering assist modules requiring stable component supply and long-term production continuity.

Supply support for UC3625Q 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 IC design.

The UC3625Q belongs to TI's UCx625 family of integrated BLDC motor controllers, engineered specifically for Hall-sensor-based trapezoidal commutation in cost-sensitive, medium-power motion systems (up to ~3 kW).

FAQ

What is the maximum recommended oscillator frequency for UC3625Q?

The UC3625Q oscillator is specified up to 500 kHz in the datasheet, but optimal performance occurs at 40–60 kHz (TYP 50 kHz) using ROSC = 20 kΩ to VREF and COSC = 2 nF. Higher frequencies increase switching losses and reduce timing margin for Hall input blanking; operation above 100 kHz may compromise cross-conduction protection reliability. Always verify stability with actual layout parasitics when exceeding 60 kHz.

Does UC3625Q support regenerative braking?

Yes, UC3625Q supports controlled regenerative braking when configured in four-quadrant mode (QUAD SEL = high) and using RC-BRAKE-triggered brake mode with current sensing. If ISENSE reflects braking current polarity, the PWM comparator remains active during brake mode, allowing duty-cycle modulation of low-side drivers to regulate regenerative energy flow back to the supply rail.

Can UC3625Q drive N-channel MOSFETs on the high side?

UC3625Q's PUA/PUB/PUC outputs are 50-V open-collector, active-low drivers - they cannot directly drive high-side N-channel MOSFETs without external level-shifting circuitry. TI's reference designs use optocouplers (e.g., Figure 11), pulse transformers (Figure 14), or cascode NPN/PNP stages to achieve high-side N-MOSFET gate drive while maintaining required VGS voltage swing.

What is the purpose of the SSTART pin on UC3625Q?

The SSTART pin on UC3625Q clamps the error amplifier output voltage during startup or fault recovery. When pulled low by the internal soft-start transistor, it holds E/A OUT ≤ SSTART voltage, preventing premature PWM activation. As an external capacitor charges via the internal 10 µA current source, SSTART ramps up, gradually enabling PWM duty cycle - ensuring controlled motor acceleration without current surge.

How does UC3625Q prevent shoot-through during commutation?

UC3625Q prevents shoot-through using dual hardware mechanisms: (1) Hall-input latches blank for two PWM cycles (50–100 µs at 20–50 kHz) after each transition, and (2) dedicated flip-flops inhibit opposing PU/PD outputs for ≥25 µs. This guarantees dead time regardless of external layout, eliminating reliance on PCB-level timing margins for cross-conduction safety.

UC3625Q Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 28-LCC (J-Lead)

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:: Surface Mount

Supplier Device Package:: 28-PLCC (11.51x11.51)

UC3625Q FAQ

1.How can I place an order for UC3625Q through Aetrix?

Please submit a Request for Quotation (RFQ) for UC3625Q 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 UC3625Q reliable?

The price and inventory of UC3625Q are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3625Q is usually 5 days.

3.What payment methods are accepted for UC3625Q?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3625Q transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for UC3625Q?

UC3625Q orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your UC3625Q 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 UC3625Q?

For technical support, including UC3625Q datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3625Q requirements.

6.How does Aetrix verify that UC3625Q is sourced from the original manufacturer or authorized distributors?

All UC3625Q 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 UC3625Q meets industry standards.

7.What is the process for return or replacement of UC3625Q?

All UC3625Q units undergo pre-shipment inspection (PSI). If there is an issue with UC3625Q, 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 UC3625Q part is unused and in its original packaging.

Return procedure for UC3625Q:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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