component
UCC3818DTR
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
markdownUCC3818DTR
Texas Instruments · AC-DC Controllers And Regulators · SOIC-16
UCC3818DTR 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 | GND | power_in | Ground reference for all voltages; VCC and VREF should be bypassed directly to GND with a 0.1-µF or larger ceramic capacitor. |
| 2 | PKLMT | input | PFC peak current limit with a threshold of 0 V, reached when the PKLMT voltage falls below 0 V; level-shift it from the negative side of the sense resistor to VREF through a resistor divider. |
| 3 | CAOUT | output | Current amplifier output from a wide-bandwidth op amp that commands the PFC PWM duty cycle, with compensation components placed between CAOUT and MOUT. |
| 4 | CAI | input | Current amplifier noninverting input, which should connect through a resistor to the GND side of the current sense resistor and remains functional down to and below GND. |
| 5 | MOUT | bidirectional | Multiplier output and current amplifier inverting input, a high-impedance node whose multiplier output current is limited to 2 × IIAC. |
| 6 | IAC | input | Current input proportional to instantaneous line voltage to the analog multiplier, with a recommended maximum IIAC of 500 µA. |
| 7 | VAOUT | output | Voltage amplifier output that regulates output voltage, internally limited to approximately 5.5 V to prevent overshoot. |
| 8 | VFF | input | Feed-forward voltage generated by mirroring 1/2 of IIAC into an external single-pole filter, which should be 1.4 V at low line. |
| 9 | VREF | power_in | Accurate 7.5-V voltage reference output capable of delivering 20 mA to peripheral circuitry, internally short-circuit current-limited, and disabled at 0 V when VCC is below the UVLO threshold; bypass with 0.1 µF or larger. |
| 10 | OVP/EN | input | Window comparator input that disables the output driver when the boost output is a programmed level above nominal and disables the driver and resets SS when pulled below 1.9 V (typ), with a maximum input voltage of 10 V. |
| 11 | VSENSE | input | Voltage amplifier inverting input, normally connected to a compensation network and to the boost output through a divider; maximum input voltage 10 V. |
| 12 | RT | input | Oscillator charging current programming pin; a resistor between 10 kΩ and 100 kΩ to GND is recommended, with a nominal voltage of 3 V on this pin. |
| 13 | SS | input | Soft-start pin that is discharged when VCC is low, charges an external capacitor through a current source when enabled, and is limited to 8 V maximum input voltage. |
| 14 | CT | input | Oscillator timing capacitor from CT to GND that sets the PWM frequency per f ≈ 0.6/(RT × CT), with the GND lead kept as short as possible. |
| 15 | VCC | power_in | Positive supply that should be held between 10 V and 17 V (at least 20 mA) for normal operation, with an 18 V absolute maximum rating, and bypassed directly to GND; outputs are inhibited unless VCC exceeds the upper UVLO threshold and stays above the lower threshold. |
| 16 | DRVOUT | output | Totem-pole MOSFET gate drive output for the boost switch, which requires a series gate resistor to limit overshoot when driving a capacitive load. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Power Management (PMIC) |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
UCC3818DTR - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files:
ucc3818dtr-etched.step/ucc3818dtr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ucc3818dtr.step/ucc3818dtr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (46 pp, sha256
ca94b4ec262a1f44, retrieved 2026-10-11, tier: lcsc) - 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).