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Allegro MicroSystems UDN2916LB-T
- Part No.:
- UDN2916LB-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UDN2916LB-T.pdf
- Description:
- IC MOTOR DRIVER BIPOLAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,889
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Product details
Overview
UDN2916LB-T from Allegro MicroSystems is a dual full-bridge PWM motor driver IC designed to control both windings of bipolar stepper motors or bidirectionally drive two DC motors. It sustains 45 V motor supply voltage, delivers 750 mA continuous output current per bridge, and features internal PWM current control with selectable 0%/33%/67%/100% current limits via logic inputs I0/I1 - used in industrial motion control systems requiring precise winding current regulation.
For engineers reviewing the UDN2916LB-T datasheet, UDN2916LB-T pinout, UDN2916LB-T application, or UDN2916LB-T equivalent, this page provides verified technical context on its dual-bridge architecture, batwing SOICW thermal design, fixed off-time PWM timing (46 μs typical), internal clamp/flyback diodes, and thermal shutdown at 170°C - all critical for stepper motor driver selection and layout validation.
Technical Context
The UDN2916LB-T integrates two independent H-bridge outputs, each with source/sink drivers, internal ground-clamp and flyback diodes, and dedicated PHASE, PWM, SENSE, and reference voltage inputs. Its monostable-based PWM current control uses external RC timing (RT/CT) to set fixed off-time (e.g., 46 μs with 56 kΩ/820 pF), enabling audible-noise-free chopping above 20 kHz.
Logic-level control includes dual current-select inputs (I0/I1) that digitally configure peak current thresholds (100%, 67%, 33%, or 0% of VREF/10RS), while internally generated ~2 μs dead time prevents shoot-through during PHASE transitions. Thermal protection disables all outputs at TJ = 170°C and re-enables at 145°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 750 mA continuous per bridge - supports bipolar stepper motors up to NEMA 17 size with stable holding torque. |
| Motor Supply Voltage | 45 V max - enables operation with 24 V or 36 V industrial DC bus supplies without external regulation. |
| Output Saturation Voltage | <1.8 V total (source + sink) at 500 mA - reduces power loss and thermal load in high-duty-cycle applications. |
| PWM Fixed Off-Time | 46 μs typical (RT = 56 kΩ, CT = 820 pF) - ensures current regulation remains above audible range and minimizes EMI. |
| Thermal Shutdown Threshold | 170°C junction temperature - protects against latch-up or permanent damage during overload or poor heatsinking. |
| Operating Ambient Range | –40°C to +105°C (Q grade) - qualified for industrial automation and embedded motion control environments. |
| Reference Voltage Range | 1.5 V to 7.5 V - allows fine-grained microstepping current control by adjusting VREF externally. |
Pinout & Package
The UDN2916LB-T is supplied in a 24-pin surface-mount wide SOIC (SOICW) package with two pairs of fused batwing leads (Pins 6, 7, 18, 19) acting as thermally enhanced power tabs for improved heat dissipation - θJA = 55°C/W on single-layer board with 1 sq. in. copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 8, 9, 10, 11, 12, 13, 16, 17, 20, 21, 22, 23, 24 | Logic/Ground/Control | Includes PHASE1/2, PWM1/2, I0/I1, VREF1/2, VCC, GND - standard CMOS-compatible interface for MCU control. |
| 6, 7, 18, 19 | Power Tab / Batwing Terminal | Fused internal connection to GND and/or VBB - serves as primary thermal path; must be soldered to large copper pour. |
| 14, 15 | Bridge 1 Outputs (OUT1A, OUT1B) | H-bridge terminals driving one motor winding; rated for 45 V, 750 mA, with integrated clamp diodes. |
| 20, 21 | Bridge 2 Outputs (OUT2A, OUT2B) | Second independent H-bridge output pair - electrically isolated but thermally coupled to same die. |
| 19, 22 | SENSE1, SENSE2 | Current-sense inputs tied to external RS resistors - enable real-time winding current feedback for PWM regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PWM-controlled bridges | Enables simultaneous, asynchronous current control of two stepper motor phases or separate DC motors. |
| Programmable current limit via I0/I1 logic | Four discrete current levels (0%/33%/67%/100%) allow torque scaling for half-step sequencing and hold/start modes. |
| Integrated clamp and flyback diodes | Eliminates need for external freewheeling diodes - simplifies PCB layout and reduces BOM count in stepper driver designs. |
| Batwing SOICW thermal design | Two pairs of fused leads provide low-thermal-resistance path to PCB copper - supports 750 mA continuous per bridge without heatsink. |
| Internal dead-time generation (~2 μs) | Prevents shoot-through during PHASE transitions - removes requirement for external timing circuitry or careful MCU timing calibration. |
Applications
| Industrial Stepper Positioning | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Precision open-loop positioning of X-Y stages in CNC routers and pick-and-place machines using NEMA 17 bipolar stepper motors. IC Role / Device Role / Timing Role: Dual-bridge driver executing microprocessor-generated PHASE/PWM sequences to regulate winding current and step direction. Use Value: 750 mA per bridge and 45 V rating support higher torque at speed; internal PWM eliminates need for external chopper ICs. |
Use Scenario: Bidirectional actuation of solenoid valves and linear actuators in automated functional test fixtures. IC Role / Device Role / Timing Role: Dual H-bridge providing reversible DC motor control and current-limited actuator drive with fast decay via I0/I1 disable. Use Value: 0% current mode (I0=I1=H) enables rapid current decay through internal diodes - improves response time between test cycles. |
| Laboratory Instrumentation | Medical Fluid Handling |
|
Use Scenario: Low-noise, repeatable syringe pump actuation in analytical instruments requiring smooth microstepping. IC Role / Device Role / Timing Role: PWM current controller setting precise peak current per phase using VREF adjustment and RC timing. Use Value: Fixed 46 μs off-time ensures chopping frequency >20 kHz - avoids audible noise and mechanical resonance in sensitive lab environments. |
Use Scenario: Controlled peristaltic pump operation in diagnostic analyzers where motor torque must scale with fluid viscosity. IC Role / Device Role / Timing Role: Dual-bridge driver regulating current in two pump motor windings independently via separate SENSE/VREF paths. Use Value: Selectable 33%/67%/100% current levels let firmware adapt torque to tubing wear or pressure changes without hardware change. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual full-bridge motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A4970 | Higher 2.5 A output current, integrated current-sense amplifier, SPI interface, wider 5–40 V supply range. | Supports larger stepper motors and closed-loop current monitoring; requires SPI host and different layout due to QFN package. | Preferred for new designs needing higher current, digital configurability, or better thermal performance in compact layouts. |
| UC3770 | Legacy 24-pin DIP dual H-bridge; no internal PWM - requires external oscillator and comparator for current control. | Demands more external components and board space; lacks thermal shutdown and logic-level current select. | Only suitable for legacy repair or cost-sensitive DIP-based designs where external PWM circuitry is already present. |
Compared with UDN2916LB-T, the A4970 offers higher integration and current capability but requires redesign for SPI control and QFN assembly, whereas the UC3770 lacks internal PWM and thermal protection - making UDN2916LB-T a balanced choice for mid-power stepper control where proven SOICW reliability and simple logic interface are prioritized.
Availability
UDN2916LB-T is available at Aetrix Electronics and suitable for industrial motion control, laboratory instrumentation, and automated test equipment requiring stable component supply despite its Pre-End-of-Life status.
Supply support for UDN2916LB-T 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
Allegro MicroSystems is a U.S.-based designer of high-performance magnetic sensing and power ICs, specializing in motion control, current sensing, and motor driver solutions for industrial and automotive markets.
The UDN2916LB-T belongs to Allegro's legacy dual full-bridge motor driver family, engineered specifically for bipolar stepper and dual-DC motor control in cost-sensitive, thermally constrained industrial applications - emphasizing integration of PWM, protection, and thermal robustness in surface-mount packages.
FAQ
What is the maximum continuous output current per bridge for the UDN2916LB-T?
The UDN2916LB-T supports 750 mA continuous output current per bridge under specified thermal conditions - validated at TA = –40°C to +105°C with adequate PCB copper area on batwing pins. Peak current capability is 1.0 A, but sustained operation above 750 mA requires derating based on ambient temperature and heatsinking.
Does the UDN2916LB-T include internal protection features?
Yes, the UDN2916LB-T integrates multiple protection functions: internal ground-clamp and flyback diodes for inductive kickback suppression, crossover-current prevention via ~2 μs internal dead time, and thermal shutdown that disables all outputs at TJ = 170°C - re-enabling automatically at 145°C. These features reduce external component count and improve system reliability.
How does the UDN2916LB-T implement PWM current control?
The UDN2916LB-T uses an internal monostable multivibrator and comparator to generate fixed off-time PWM. When sensed voltage across the external RS resistor reaches VREF/10, the source driver turns off for a duration set by RT × CT (e.g., 46 μs). This cycle repeats to maintain average winding current - eliminating need for external PWM generators or microcontroller timing loops.
What package type is used for the UDN2916LB-T and how does it aid thermal performance?
The UDN2916LB-T uses a 24-pin wide SOIC (SOICW) package with two pairs of fused batwing leads (Pins 6, 7, 18, 19) that serve as direct thermal conduction paths to PCB copper. Measured θJA is 55°C/W on a single-layer board with 1 sq. in. of 2 oz copper - enabling 750 mA continuous operation without external heatsinks when properly mounted.
Is the UDN2916LB-T still recommended for new designs?
No - the UDN2916LB-T is designated Pre-End-of-Life (status effective January 31, 2011), with final order phase expected within minimum 6 months of that date. Allegro recommends the A4970 for new designs due to higher current, integrated diagnostics, and active production status - though UDN2916LB-T remains supported for legacy continuity and existing production ramps.
UDN2916LB-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Motor Type - Stepper:
- Bipolar
- Motor Type - AC, DC:
- Brushed DC
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (4)
- Interface:
- Parallel
- Technology:
- Bipolar
- Step Resolution:
- -
- Applications:
- General Purpose
- Current - Output:
- 750mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Voltage - Load:
- 10V ~ 45V
- Operating Temperature:
- -20°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
UDN2916LB-T FAQ
1.How can I place an order for UDN2916LB-T through Aetrix?
Please submit a Request for Quotation (RFQ) for UDN2916LB-T 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 UDN2916LB-T reliable?
The price and inventory of UDN2916LB-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UDN2916LB-T is usually 5 days.
3.What payment methods are accepted for UDN2916LB-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UDN2916LB-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UDN2916LB-T?
UDN2916LB-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UDN2916LB-T 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 UDN2916LB-T?
For technical support, including UDN2916LB-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UDN2916LB-T requirements.
6.How does Aetrix verify that UDN2916LB-T is sourced from the original manufacturer or authorized distributors?
All UDN2916LB-T 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 UDN2916LB-T meets industry standards.
7.What is the process for return or replacement of UDN2916LB-T?
All UDN2916LB-T units undergo pre-shipment inspection (PSI). If there is an issue with UDN2916LB-T, 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 UDN2916LB-T part is unused and in its original packaging.
Return procedure for UDN2916LB-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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