UC3849DWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The UC3849DWG4 is an average current-mode PWM secondary-side controller IC from Texas Instruments operating from an 8-20V supply, designed to regulate power converter output stages with precise current control in a 24-pin SOIC package. It implements pulse-width modulation with current-mode feedback for improved line and load transient response. Available from authorized distributors with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 24
- Lifecycle
- OBSOLETE
- Datasheet
- UC3849DWG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Average current-mode PWM control on the secondary side provides superior current regulation accuracy and improved transient response over voltage-mode alternatives
- 8V to 20V input supply range (nominal 12V) suits secondary-side post-regulation in isolated DC-DC converters and telecom power systems
- 24-pin SOIC (R-PDSO-G24) surface-mount package enables compact board layouts for high-density power supply modules
- Pb-free RoHS-compliant construction (JESD-609 e4) meets modern environmental regulations for industrial and commercial applications
Applications
The UC3849DWG4 is used in the secondary-side post-regulation stage of isolated DC-DC power converters in telecommunications, networking equipment, and industrial power systems where precise output current control is required. Its average current-mode architecture makes it well suited for battery charger controllers, multi-output flyback converters, and distributed power architectures where tight load regulation across multiple outputs is critical. The 24-pin SOIC package and 12V nominal supply align with standard telecom and embedded computing power module designs.
Specifications
| Pbfree Code | Yes |
| YTEOL | 0 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 20V |
| Input Voltage-Min | 8V |
| Input Voltage-Nom | 12V |
| JESD-30 Code | R-PDSO-G24 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 0.3A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP24,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Screening Level | TS 16949 |
| Supply Current-Max (Isup) | 33mA |
| Surface Mount | YES |
| Switcher Configuration | SINGLE |
| Switching Frequency-Max | 550kHz |
| Technology | BIPOLAR |
| Temperature Grade | COMMERCIAL |
| 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 control mode does the UC3849DWG4 implement?
The UC3849DWG4 implements average current-mode PWM control on the power converter secondary side. Unlike peak current-mode control, average current-mode control measures and regulates the average inductor current over each switching cycle, resulting in more accurate current regulation, better noise immunity, and improved stability margins in continuous conduction mode designs.
What input voltage range does the UC3849DWG4 operate from?
The UC3849DWG4 operates from a supply voltage of 8V minimum to 20V maximum, with a nominal design point of 12V. This range aligns with common auxiliary power rails found on the secondary side of isolated DC-DC converters used in telecommunications, networking, and industrial power systems.
What package does the UC3849DWG4 come in?
The UC3849DWG4 is housed in a 24-pin plastic small-outline IC package (JESD-30 code R-PDSO-G24), commonly referred to as SOIC-24. This surface-mount package is compatible with standard pick-and-place assembly and reflow soldering, and is available in tape-and-reel format for automated production (indicated by the G4 suffix).
What power supply topologies is the UC3849DWG4 suited for?
The UC3849DWG4 is designed for secondary-side PWM control in isolated flyback, forward, and push-pull converter topologies where output current regulation is required. It is commonly used in multi-output power supplies, synchronous rectifier controllers, battery charger stages, and distributed power bricks operating in continuous conduction mode.
Is the UC3849DWG4 RoHS compliant and is it in production?
The UC3849DWG4 is Pb-free and carries a JESD-609 e4 code, confirming RoHS compliance. However, the YTEOL value of 0 indicates this part may be at or approaching end-of-life. Designers should confirm current production status with Texas Instruments authorized distributors before committing to new designs or long-term supply agreements.
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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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