Texas Instruments UCC28700DBVT

Mfr. Part

UCC28700DBVT

Manufacturer

Luminary Micro/Texas Instruments

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Detailed Description

Primary-side regulated flyback controller for isolated AC‑DC converters. Operates without an internal power switch and drives an external MOSFET. Optimized for very low standby power, tight constant-voltage and constant-current regulation, and reliable fault protection. Compact SOT‑23‑6 package for space‑constrained designs.

Key Features

Primary-side regulation for CV and CC control using auxiliary winding sensing

External MOSFET drive, no internal switch

Wide VDD operating range 9 V to 35 V

Start-up threshold 21 V

Variable switching frequency 1 kHz to 130 kHz for high efficiency over load range

Flyback topology for isolated outputs

Built-in protections including current limiting and over-voltage protection

RoHS3 compliant

Surface-mount SOT‑23‑6 DBV package

Operating junction temperature range −20°C to +125°C

Key Advantages

Eliminates optocoupler and secondary-side reference in many designs, reducing BOM and improving reliability

Very low standby power for energy‑efficient adapters and chargers

Stable regulation across line and load with simple magnetics and sensing

Small footprint enables compact power supplies

Broad supply range and robust protections simplify start-up and fault handling

Proven TI solution with strong documentation and ecosystem

Packaging

Type SOT‑23‑6 DBV, surface mount

Material Molded plastic body with matte‑tin plated gull‑wing leads

Size Compact 6‑lead outline suitable for high‑density boards

Pin configuration 6 pins total; typical functions include VDD, GND, gate drive to external MOSFET, current sense, and auxiliary winding sense. Refer to datasheet for exact pinout and numbering.

Thermal characteristics Junction operation −20°C to +125°C (TJ). Thermal performance depends on PCB copper and airflow. See datasheet for recommended layout to improve heat dissipation.

Electrical properties VDD operating 9 V to 35 V. Start-up threshold 21 V. Switching frequency 1 kHz to 130 kHz. No internal power switch. Isolated output via flyback transformer. Integrated current limit and OVP.

Shipment format Tape and Reel TR for automated assembly

Mounting Surface mount compatible with standard reflow profiles

Lifecycle

Status Active and widely available

Discontinuation Not nearing end of life based on current industry status

Equivalent or alternative models UCC28701, UCC28702, UCC28703, UCC28704, UCC28705, UCC28706 are close family variants offering different control parameters, start-up behaviors, standby power targets, and optimization points. UCC28720 and UCC28722 provide similar primary-side regulation with different start-up implementations and features. Selection depends on desired efficiency curve, minimum load power, start-up method, and protection profile. Contact us for detailed cross‑reference and guidance.

Advisory If you need drop‑in or second‑source options beyond the TI family, please contact our sales team via the Y-IC website for tailored recommendations

Key Application Areas

Smartphone and tablet USB chargers

AC‑DC wall adapters and auxiliary power supplies

Standby supplies for consumer and industrial equipment

Smart appliances and IoT gateways

Set‑top boxes and networking gear

Isolated bias supplies for industrial control and instrumentation

LED driver front ends requiring isolated constant current with primary‑side control

Datasheet

Y-IC provides the most authoritative and up‑to‑date datasheet for UCC28700DBVT on our website. We recommend downloading the datasheet directly from this product page for complete specifications, pinout, application notes, and layout guidance.

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