Texas Instruments UC2625NG4

Overview

UC2625NG4 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, over-voltage/under-voltage protection, and programmable cross-conduction protection. It operates across –40°C to +105°C and supports two- or four-quadrant PWM operation.

For engineers reviewing the UC2625NG4 datasheet, UC2625NG4 pinout, UC2625NG4 application, or UC2625NG4 equivalent, key selection considerations include its Hall-sensor-based commutation decoding, 40–60 kHz oscillator frequency range, 5 V trimmed reference output, 2.5 V level-shifted current sense amplifier, and integrated direction latch with 25–50 µs deadtime for safe reversal.

Technical Context

The UC2625NG4 implements fixed-frequency PWM motor control using an internal RC oscillator (40–60 kHz typical) and supports both voltage-mode and current-mode control via E/A IN(+) and E/A IN(–) inputs. Its position decoder translates three 120°-spaced Hall sensor inputs (H1–H3) into six-phase drive signals for BLDC commutation.

It features dual current sensing paths: ISENSE1/ISENSE2 feed a gain-of-2 absolute-value amplifier with 2.5 V level shift, enabling peak-current limiting at ~0.2 V/RSENSE and fail-safe shutdown at ~0.3 V/RSENSE. The direction latch, clocked by the PWM oscillator, enforces minimum 25 µs delay between direction changes to prevent cross-conduction.

Key Specifications

Pinout & Package

UC2625NG4 is available in SOIC-28 (DW) package, with identical pin functions across SOIC, PLCC, and LCC variants per TI SLUS353C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar brushless DC motor controller applications.

Compared with UC3625N and UC1625J, the UC2625NG4 delivers optimal balance of industrial-grade thermal performance, cost, and availability-making it the default choice for factory automation, robotics, and medical equipment where –40°C to +105°C operation is essential but military screening is not.

Availability

UC2625NG4 is available at Aetrix Electronics and suitable for industrial BLDC drives, robotics actuators, automated guided vehicles, and medical infusion pumps requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for UC2625NG4 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 motor control ICs.

The UC2625NG4 belongs to TI's UCx625 family of integrated BLDC controllers, designed specifically for high-reliability industrial motor systems requiring Hall-sensor commutation, programmable braking, and robust fault protection without external logic.

FAQ

What is the operating temperature range of the UC2625NG4?

The UC2625NG4 is characterized for operation from –40°C to +105°C, making it suitable for industrial environments where ambient temperatures exceed commercial-grade limits. This range is confirmed in TI's SLUS353C datasheet and distinguishes it from the UC3625N (0°C to +70°C) and UC1625J (–55°C to +125°C). The UC2625NG4 maintains full specification compliance-including oscillator stability, reference accuracy, and driver performance-across this entire range.

How does the UC2625NG4 implement safe direction reversal?

The UC2625NG4 uses a direction latch and two-bit shift register clocked by the internal PWM oscillator to enforce a minimum 25–50 µs delay between direction changes. Reversal is only permitted when SPEED-IN is below 250 mV-typically achieved by filtering TACH-OUT-ensuring the motor spins slowly enough to avoid damaging back-EMF. This mechanism is integral to the UC2625NG4's architecture and requires no external logic or timing components.

Can the UC2625NG4 support both two-quadrant and four-quadrant motor control?

Yes, the UC2625NG4 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 are chopped), optimizing efficiency. When high, it enables four-quadrant operation (all drivers chopped), delivering balanced acceleration and deceleration control-essential for servo applications. This dual-mode capability is built into the UC2625NG4's control logic and requires no firmware or external configuration.

What is the function of the RC-BRAKE pin on the UC2625NG4?

The RC-BRAKE pin (Pin 21) serves two functions: first, it sets tachometer pulse width via RT/CT timing components (T ≈ 0.67 × RT × CT); second, pulling it below 0.8–1.2 V triggers active braking mode-turning off all high-side drivers, enabling all low-side drivers, and disabling TACH-OUT. This dual-role design allows precise brake timing and failsafe motor stoppage using a single pin on the UC2625NG4.

Does the UC2625NG4 include integrated current sensing, and how is it configured?

Yes, the UC2625NG4 integrates a differential current sense amplifier with fixed gain (~2 V/V) and 2.5 V level shift, accepting inputs on ISENSE1 and ISENSE2 (Pins 4 and 5). It supports both pulse-by-pulse limiting (using RS shunt) and average current sensing (using RD shunt in four-quadrant mode). The resulting ISENSE output (Pin 3) feeds internal comparators for real-time current control-no external op-amp or ADC is needed for basic current regulation in the UC2625NG4.