component
UCC28251RGPT
Public Made by Adomby adom
Texas Instruments AC-DC Controllers & Regulators, VQFN-20-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownUCC28251RGPT
Texas Instruments · AC-DC Controllers & Regulators · VQFN-20-EP(4x4)
UCC28251RGPT from Texas Instruments, in a VQFN-20-EP(4x4). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | REF/EA+ | input | Error amplifier non-inverting input, with a common-mode range of 0 V to 3.0 V. |
| 2 | FB/EA- | input | Error amplifier inverting input, with a common-mode range of 0 V to 3.0 V. |
| 3 | COMP | bidirectional | Error amplifier output; in primary-side control the COMP pin is shorted to FB/EA- and the soft-start voltage is followed. |
| 4 | GND | power_in | Ground reference for all pins. |
| 5 | VDD | power_in | Bias supply input with a recommended range of 4.7 V to 17 V and an absolute maximum of 20 V. |
| 6 | SRB | output | 0.2-A sink/source synchronous rectifier output. |
| 7 | SRA | output | 0.2-A sink/source synchronous rectifier output. |
| 8 | OUTB | output | 0.2-A sink/source primary switching output. |
| 9 | OUTA | output | 0.2-A sink/source primary switching output. |
| 10 | HICC | input | Sets the cycle-by-cycle current-limit shutdown delay and the hiccup restart time through an external capacitor to GND; the HICC threshold is 0.6 V and the pin is rated to 3.6 V. |
| 11 | PS | input | Primary-off to synchronous-rectifier-on dead-time set by a resistor to GND, with a resistor range of 5 kΩ to 250 kΩ. |
| 12 | SP | input | Synchronous-rectifier-off to primary-on dead-time set by a resistor to GND, with a resistor range of 5 kΩ to 250 kΩ. |
| 13 | SS | bidirectional | Soft-start programming pin with a 26 µA to 30 µA charge current and a clamp voltage of 3.3 V to 4.0 V; pulling it low externally shuts down the controller. |
| 14 | VSENSE | input | Output voltage sensing for pre-bias control with an input range of 0 V to 3.3 V. |
| 15 | RT | input | Oscillator frequency set by a resistor to GND (12.5 kΩ to 200 kΩ) or external synchronous clock input (84 kHz to 1.89 MHz). |
| 16 | RAMP/CS | input | PWM ramp input for voltage-mode control or current-sense input for current-mode control, with a voltage range of 0 V to 2.3 V. |
| 17 | ILIM | input | Current sense for cycle-by-cycle over-current protection; the output pulse terminates when the voltage exceeds 0.5 V. |
| 18 | EN | input | Device enable and disable with a trigger threshold of 2.0 V typical; pull to VREF if the enable function is not used. |
| 19 | OVP/OTP | input | Over-voltage and over-temperature protection input; a voltage above 0.7 V causes a fault shutdown. |
| 20 | VREF | power_out | 3.3 V reference output (3.17 V to 3.33 V) that requires a 0.47 µF to 2.2 µF bypass capacitor. |
| 21 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VQFN-20-EP(4x4) |
| Category | Power Supply Chip |
| Pins | 21 |
CAD (KiCad official)
- Symbol:
UCC28251RGPT - Footprint:
Package_DFN_QFN:QFN-20-1EP_4x4mm_P0.5mm_EP2.5x2.5mm - 3D model: VQFN-20-EP(4x4) (KiCad packages3D, STEP)
- 3D model files:
ucc28251rgpt-etched.step/ucc28251rgpt-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ucc28251rgpt.step/ucc28251rgpt.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (58 pp, sha256
8c6282d6aa147bda, retrieved 2026-10-11, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).