UC2851DWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The UC2851DWG4 is a PWM current-mode switching controller from Texas Instruments operating at up to 500 kHz with an 8V to 30V input voltage range, suitable for both current-mode and voltage-mode power supply control. Housed in an 18-pin SOIC package for easy PCB integration. Available in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 18
- Lifecycle
- OBSOLETE
- Datasheet
- UC2851DWG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Dual-mode operation supports both current-mode and voltage-mode PWM control for flexible power topology design
- 500 kHz switching frequency enables use of smaller inductors and capacitors, reducing overall power supply size
- Wide 8V to 30V input voltage range accommodates diverse power sources including 12V and 24V industrial rails
- 18-pin SOIC package provides comprehensive feature set with over-current protection, soft-start, and oscillator programming
Applications
The UC2851DWG4 is well-suited for designing switch-mode power supplies in industrial control equipment, telecommunications infrastructure, and distributed power architectures where both current-mode and voltage-mode control flexibility is required. Its 500 kHz maximum switching frequency reduces passive component sizes in DC-DC converters including boost, flyback, and forward converter topologies. The device is also applicable in battery chargers, motor drive power stages, and UPS systems operating from 12V or 24V bus voltages.
Specifications
| YTEOL | 0 |
| Additional Feature | CURRENT MODE OPERATION IS ALSO POSSIBLE |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT/VOLTAGE-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 30V |
| Input Voltage-Min | 8V |
| Input Voltage-Nom | 20V |
| JESD-30 Code | R-PDSO-G18 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 0.2A |
| Output Voltage-Min | 18V |
| Output Voltage-Nom | 18.5V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP18,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Switcher Configuration | PUSH-PULL |
| Switching Frequency-Max | 500kHz |
| Technology | BICMOS |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 2 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What switching frequency does the UC2851DWG4 support and how is it set?
The UC2851DWG4 supports switching frequencies up to 500 kHz, which is programmed externally using a resistor and capacitor connected to the oscillator pin. Higher switching frequencies allow designers to use smaller magnetic components and output capacitors, reducing the overall size and cost of the power supply at the trade-off of slightly higher switching losses.
Does the UC2851DWG4 support current-mode control only, or also voltage-mode?
The UC2851DWG4 supports both current-mode and voltage-mode PWM control operation. Current-mode control provides inherent cycle-by-cycle current limiting, improved transient response, and simplified loop compensation. Voltage-mode operation is also possible as noted in the device specifications, giving power supply designers the flexibility to choose the control topology best suited to their application requirements.
What is the input voltage range of the UC2851DWG4?
The UC2851DWG4 operates from an input voltage range of 8V to 30V, with a nominal operating point of 20V. This range covers common industrial supply voltages including 12V and 24V bus standards, making it broadly applicable in industrial automation, process control, and distributed power systems without requiring additional voltage pre-regulation.
What protection features does the UC2851DWG4 include?
The UC2851DWG4 includes cycle-by-cycle over-current limiting through current-mode operation, under-voltage lockout (UVLO) to prevent operation below the 8V minimum input threshold, and a soft-start function to limit inrush current during power-up. These features protect both the controller and the power stage components from damage during fault conditions or startup transients.
What power topologies is the UC2851DWG4 compatible with?
The UC2851DWG4 is compatible with a wide range of isolated and non-isolated switch-mode power supply topologies including flyback, forward, push-pull, half-bridge, and full-bridge converters. Its PWM current-mode architecture is especially well-suited for flyback and forward converters in the 50W to 500W power range, serving applications in industrial equipment, telecom power, and electronic ballasts.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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