component
UCC2891DR
Public Made by Adomby adom
Texas Instruments AC-DC Controllers And Regulators, SOIC-16. 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
markdownUCC2891DR
Texas Instruments · AC-DC Controllers And Regulators · SOIC-16
UCC2891DR from Texas Instruments, in a SOIC-16. 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 | RTDEL | input | A resistor from this pin to GND programs the turn-on delay for both gate drive outputs to accommodate the resonant transitions of the active clamp power converter. |
| 2 | RTON | input | A resistor to GND programs an internal current source that charges the internal timing capacitor and is used to set the operating frequency and maximum duty cycle. |
| 3 | RTOFF | input | A resistor to GND programs an internal current source that discharges the internal timing capacitor and is used to set the switching period and maximum duty cycle. |
| 4 | VREF | power_out | Supplies the controller's internal 5-V bias rail as a reference voltage with current-limited output of approximately 5 mA for external circuits. |
| 5 | SYNC | input | Unidirectional synchronization input for the internal oscillator with minimum pulse width of approximately 50 ns and synchronizing frequency higher than the free-running oscillator frequency. |
| 6 | GND | power_in | Provides the reference potential for all small-signal control and programming circuitry inside the device. |
| 7 | CS | input | Direct input to the PWM and current-limit comparators for peak current sensing; threshold is 0.75 V for UCC2891. |
| 8 | RSLOPE | input | A resistor connected from this pin to GND sets the amplitude of the slope compensation current for current-mode control circuitry. |
| 9 | FB | input | Input for the control voltage of the pulse width modulator generated by an external error amplifier; useful voltage range is approximately 1.25 V to 4.5 V. |
| 10 | SS/SD | input | A capacitor from this pin to GND is charged by an internal current source to program the soft-start interval and discharged during fault conditions. |
| 11 | PGND | power_in | Dedicated connection for all high-current circuits including the two high-current gate drivers; requires low-impedance external connection to GND pin. |
| 12 | AUX | output | High-current gate drive output for the auxiliary clamp MOSFET with 2-A source and 2-A sink current capability; active low for P-channel devices. |
| 13 | OUT | output | High-current output driving the main N-channel PWM switching MOSFET with 2-A source and 2-A sink current capability. |
| 14 | VDD | power_in | Power supply for the device biasing the internal gate drivers and 5-V regulator; supply range is 8.5 to 16.0 V with recommended 1-µF bypass capacitor to PGND. |
| 15 | LINEUV | input | Monitors incoming power source to provide accurate undervoltage lockout with programmable hysteresis; threshold voltage is 1.27 V. |
| 16 | VIN | power_in | Connected to the input power rail directly for UCC2891; a high-voltage P-channel JFET startup device provides startup current until bootstrap bias is available, maximum rating 120 V. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Power Management (PMIC) |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
UCC2891DR - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files:
ucc2891dr-etched.step/ucc2891dr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ucc2891dr.step/ucc2891dr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (41 pp, sha256
0b123b68deef52c5, retrieved 2026-09-26, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-4-6(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).