My Inquiry
My Account
Texas Instruments UC2637NG4
- Part No.:
- UC2637NG4
- Manufacturer:
- Texas Instruments
- Category:
- Motor Drivers, Controllers
- Package:
- 18-DIP (0.300", 7.62mm)
- Datasheet:
-
UC2637NG4.pdf
- Description:
- IC MOTOR DRIVER 2.5V-20V 18DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,118
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
UC2637NG4 from Texas Instruments is a monolithic PWM motor controller IC designed for bi-directional DC motor drive applications in industrial and embedded systems. It integrates a sawtooth oscillator, dual ±100mA PWM comparators with source/sink output drivers, error amplifier, pulse-by-pulse current limiting, under-voltage lockout, and a temperature-compensated 2.5V shutdown threshold. It operates across -25°C to +85°C and supports ±2.5V to ±20V dual supply rails.
For engineers reviewing the UC2637NG4 datasheet, UC2637NG4 pinout, UC2637NG4 application, or UC2637NG4 equivalent, key selection considerations include its dual-output PWM architecture, ±100mA driver capability, 10 kHz oscillator accuracy (±10% over temperature), and compatibility with power-FET or bipolar transistor gate driving in servo and motion control circuits.
Technical Context
The UC2637NG4 implements a fixed-frequency sawtooth oscillator whose frequency is set externally via RT and CT components, with initial accuracy of ±5% and ±10% variation over temperature. Its uncommitted PWM comparators accept analog error signals at pins +AIN/–AIN and reference thresholds at +BIN/–BIN to generate complementary duty-cycle-modulated outputs AOUT and BOUT.
Internal protection includes pulse-by-pulse current limiting using differential inputs referenced to –VS, under-voltage lockout activating at 4.15V to 5.0V, and a shutdown comparator with 40mV hysteresis referenced to +VS. The error amplifier delivers 15 V/µs slew rate, 2 MHz unity-gain bandwidth, and ±20mA output drive capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 10 kHz typical (±10% over –25°C to +85°C); enables precise timing control for motor commutation and feedback loops. |
| Output Drive Capability | ±100mA continuous per output (pins 4 & 7); sufficient to directly drive power-FET gates or small bipolar transistors without external buffers. |
| Supply Voltage Range | ±2.5V to ±20V dual supply; supports wide-range industrial power rails and robust operation under varying input conditions. |
| Shutdown Threshold | –2.5V ±0.2V (referred to +VS); provides accurate, temperature-stable enable/disable control for system-level power sequencing. |
| Error Amplifier Slew Rate | 15 V/µs; ensures fast response to position or speed error transients in closed-loop servo applications. |
| Pulse-by-Pulse Current Limit | 200 mV offset with ±0.2 mV/°C T.C.; enables cycle-by-cycle overcurrent protection without latch-up, critical for motor stall recovery. |
| Operating Temperature | –25°C to +85°C; qualified for commercial/industrial environments excluding extended military or automotive extremes. |
Pinout & Package
UC2637NG4 is housed in an 18-pin PDIP (Plastic Dual In-line Package) with 0.3-inch width and standard through-hole mounting. Pin 1 is identified by a notch or dot marking on the package body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+VTH) | Oscillator upper threshold voltage input | Sets peak voltage of internal sawtooth waveform; determines oscillator frequency when used with RT/CT network. |
| 2 (CT) | Oscillator timing capacitor connection | External capacitor sets oscillator period; paired with RT to define 10 kHz nominal frequency. |
| 3 (–VTH) | Oscillator lower threshold voltage input | Sets valley voltage of sawtooth; enables programmable frequency stability over supply variations. |
| 4 (AOUT) | Output A driver (source/sink) | Dual-mode PWM output capable of ±100mA; drives high-side or low-side switch in H-bridge configurations. |
| 5 (–VS) | Negative supply rail | Reference for all negative-side circuitry including current sense, comparators, and output stage. |
| 6 (N/C) | No connect | Internally unused; must remain unconnected per datasheet guidance. |
| 7 (+VS) | Positive supply rail | Reference for positive-side circuitry; supplies bias and output high-level voltage. |
| 8 (BOUT) | Output B driver (source/sink) | Complementary PWM output to AOUT; enables bi-directional motor control with deadtime management. |
| 9 (+BIN) | Positive PWM comparator reference input | Adjusts deadtime or deadband window; higher voltage widens null zone to reduce power dissipation near zero error. |
| 10 (–BIN) | Negative PWM comparator reference input | Paired with +BIN to define symmetric or asymmetric deadband; critical for short-circuit prevention during switching transitions. |
| 11 (–AIN) | Negative error signal input to PWM comparators | Accepts inverted motor error signal; combined with +AIN to determine output polarity and duty cycle. |
| 12 (+AIN) | Positive error signal input to PWM comparators | Primary feedback path for position/speed error; modulates AOUT/BOUT pulse widths proportionally to error magnitude and sign. |
| 13 (+C/L) | Positive current limit sense input | Connects to shunt resistor high side; enables differential current sensing with noise rejection up to ±VS–3V common-mode range. |
| 14 (–C/L) | Negative current limit sense input | Completes differential current sense pair; rejects common-mode noise and supply ripple during motor phase current monitoring. |
| 15 (SHUTDOWN) | Active-low shutdown control input | Pulling >2.5V below +VS disables outputs and places them in low state; used for fault recovery or power sequencing. |
| 16 (N/C) | No connect | Internally unused; must remain unconnected. |
| 17 (+E/A) | Error amplifier non-inverting input | Accepts reference or command signal; forms outer loop with inner PWM modulation for precision control. |
| 18 (–E/A) | Error amplifier inverting input | Receives feedback signal (e.g., tachometer or encoder-derived); establishes closed-loop regulation point. |
| 19 (E/A OUTPUT) | Error amplifier output | Drives internal PWM comparators; capable of ±20mA sink/source to interface with external compensation networks. |
| 20 (ISET) | Oscillator charging current set terminal | Internally buffered +VTH voltage applied here develops CT charging current; ensures frequency stability vs. supply drift. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PWM comparators | Uncommitted inputs allow flexible error signal routing and configurable deadtime/deadband modes for optimized motor torque and efficiency. |
| ±100mA dual output drivers | Eliminates need for external gate drivers in low-to-mid power H-bridge designs, reducing BOM count and PCB area. |
| Temperature-compensated 2.5V shutdown threshold | Enables reliable system-level fault response across full operating temperature range without external biasing or calibration. |
| Pulse-by-pulse current limiting | Prevents destructive overcurrent events during motor stall or short-circuit without latching, supporting automatic recovery. |
| ±2.5V to ±20V dual-supply operation | Supports diverse power architectures including split-rail industrial supplies and battery-backed systems with wide voltage tolerance. |
Applications
| Industrial Servo Position Control | DC Motor Speed Regulation |
|---|---|
|
Use Scenario: Closed-loop positioning of CNC axes or robotic joints using encoder feedback and PID correction. IC Role / Device Role / Timing Role: UC2637NG4 acts as the PWM modulation engine, converting error amplifier output into complementary drive signals for H-bridge power stage. Use Value: Delivers <100 ns rise/fall times and ±100mA drive strength to minimize switching losses and maintain positional accuracy under dynamic load changes. |
Use Scenario: Variable-speed fan or pump control in HVAC or industrial automation systems with analog 0–10V or 4–20mA setpoint input. IC Role / Device Role / Timing Role: UC2637NG4 serves as the core switched-mode controller, generating duty-cycle-modulated gate signals synchronized to its internal 10 kHz oscillator. Use Value: Enables smooth speed ramping and stable low-RPM operation via programmable deadband, reducing acoustic noise and mechanical wear. |
| Bi-Directional Actuator Drive | Lab Equipment Motion Control |
|
Use Scenario: Precision linear actuator in automated test equipment requiring reversible motion and force-limited end-stop detection. IC Role / Device Role / Timing Role: UC2637NG4 provides bidirectional PWM outputs with integrated current limiting, interfacing directly to discrete MOSFET half-bridges. Use Value: Pulse-by-pulse current limiting at 200 mV offset allows real-time torque limiting without software intervention, enhancing safety and repeatability. |
Use Scenario: Micro-positioning stage in optical alignment systems where low-noise, jitter-free motor control is essential. IC Role / Device Role / Timing Role: UC2637NG4 functions as the analog-domain PWM generator, accepting low-noise op-amp error signals and delivering clean, matched A/B outputs. Use Value: 15 V/µs slew rate and 2 MHz bandwidth error amplifier preserve signal integrity in high-resolution feedback paths, minimizing tracking error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PWM motor controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3637NG4 | Rated for 0°C to +70°C (vs. UC2637NG4's –25°C to +85°C); identical pinout, electrical specs, and functional block diagram. | Targeted at consumer or lab-grade equipment with narrower ambient requirements; not suitable for industrial enclosures with thermal cycling. | Select UC3637NG4 only if ambient temperature stays within 0–70°C and RoHS compliance is mandatory (both share NIPDAU finish). |
| TL494CN | Single-ended output topology (not dual complementary); no built-in current limit comparator; requires external op-amp for error amplification. | Better suited for flyback or forward converters than bi-directional motor drive; lacks dedicated deadband/deadtime configuration pins. | Choose TL494CN only for cost-sensitive, single-output SMPS designs - not as a functional replacement for UC2637NG4's dual-drive, motor-specific architecture. |
Compared with UC3637NG4 and TL494CN, the UC2637NG4 uniquely combines industrial temperature range, integrated dual PWM outputs with programmable deadband, and on-chip current limiting - making it the only drop-in solution for ruggedized bi-directional DC motor control without external support circuitry.
Availability
UC2637NG4 is available at Aetrix Electronics and suitable for industrial servo systems, laboratory motion controllers, and bi-directional actuator modules requiring stable component supply and long-term manufacturability.
Supply support for UC2637NG4 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 heritage in precision control ICs.
The UC2637NG4 belongs to TI's legacy UCx637 family of PWM motor controllers, engineered specifically for high-reliability, analog-intensive DC motor drive applications in industrial automation and instrumentation.
FAQ
What is the maximum continuous output current capability of the UC2637NG4?
The UC2637NG4 provides ±100mA continuous source/sink current per output (pins 4 and 7), verified across its full –25°C to +85°C operating range. This rating supports direct gate driving of small-to-medium power MOSFETs or bipolar transistors in H-bridge topologies without external buffers. Peak pulsed current reaches 500mA, enabling rapid switching during transient motor load conditions while maintaining thermal stability in the PDIP package.
Does the UC2637NG4 support single-supply operation?
Yes, the UC2637NG4 supports single-supply operation by referencing –VS to ground, allowing use with +VS = +5V to +40V. However, its internal architecture remains dual-rail: the error amplifier and comparators retain full common-mode range from (–VS + 2V) to (+VS – 2V), and output swing is specified relative to both rails. Designers must ensure proper biasing of +VTH/–VTH and current sense inputs when operating in single-supply mode to maintain oscillator stability and current limit accuracy.
How is deadtime controlled in the UC2637NG4?
Deadtime in the UC2637NG4 is configured using the differential voltage between pins +BIN (9) and –BIN (10). A zero differential enables zero-deadtime operation for maximum stiffness; increasing the difference introduces programmable deadtime to prevent shoot-through in power stages. The UC2637NG4 also supports deadband mode by widening the comparator acceptance window - implemented by adjusting +BIN/–BIN levels - which reduces power dissipation near the error null point without compromising system stability.
What is the purpose of the ISET pin (pin 20) on the UC2637NG4?
The ISET pin (20) on the UC2637NG4 receives the internally buffered +VTH voltage and develops the CT capacitor charging current through an internal current source. This design ensures that oscillator frequency remains stable against supply voltage variations, because both the sawtooth thresholds (+VTH/–VTH) and charging current scale proportionally with ±VS. External RT resistor value directly sets the oscillator frequency alongside CT, per the formula f = 1/(RT × CT × ln(3)).
Can the UC2637NG4 be used for stepper motor control?
The UC2637NG4 is not optimized for stepper motor control. It lacks microstepping logic, phase sequencing, or current chopping features required for bipolar stepper drivers. Its dual PWM outputs are designed for analog error-driven, continuous-duty bi-directional DC motor control - such as servo or brushed DC actuators - where torque is proportional to average current. For stepper applications, dedicated drivers like the DRV88xx series or L297/L298 combinations provide appropriate commutation and current regulation.
UC2637NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 18-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- Brushed DC
- Function:
- Controller - Commutation, Direction Management
- Output Configuration:
- Pre-Driver - Half Bridge (4)
- Interface:
- Parallel
- Technology:
- -
- Step Resolution:
- -
- Applications:
- General Purpose
- Current - Output:
- -
- Voltage - Supply:
- 2.5V ~ 20V
- Voltage - Load:
- -
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 18-PDIP
UC2637NG4 FAQ
1.How can I place an order for UC2637NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2637NG4 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 UC2637NG4 reliable?
The price and inventory of UC2637NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2637NG4 is usually 5 days.
3.What payment methods are accepted for UC2637NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2637NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2637NG4?
UC2637NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2637NG4 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 UC2637NG4?
For technical support, including UC2637NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2637NG4 requirements.
6.How does Aetrix verify that UC2637NG4 is sourced from the original manufacturer or authorized distributors?
All UC2637NG4 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 UC2637NG4 meets industry standards.
7.What is the process for return or replacement of UC2637NG4?
All UC2637NG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC2637NG4, 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 UC2637NG4 part is unused and in its original packaging.
Return procedure for UC2637NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
UC2637NG4 Tags
-
DRV2603RUNR
Texas Instruments
-
DRV8837CDSGR
Texas Instruments
-
DRV8837DSGR
Texas Instruments
-
DRV8838DSGR
Texas Instruments
-
DRV8839DSSR
Texas Instruments
-
EMC2301-1-ACZL-TR
Microchip Technology
-
DRV8231ADSGR
Texas Instruments
-
EMC2302-2-AIZL-TR
Microchip Technology
-
DRV8800PWPR
Texas Instruments
-
DRV8835DSSR
Texas Instruments
-
EMC2303-1-KP-TR
Microchip Technology
-
DRV8876PWPR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
