component
UCC3818ADR
Public Made by Adomby adom
Texas Instruments AC-DC Controllers And Regulators, SOIC-16. Datasheet-verified pinout, 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
markdownUCC3818ADR
Texas Instruments · AC-DC Controllers And Regulators · SOIC-16
UCC3818ADR from Texas Instruments, in a SOIC-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Ground connection; all voltages are measured with respect to ground; bypass VCC and VREF to GND with 0.1µF or larger ceramic capacitor. |
| 2 | PKLMT | input | PFC peak current limit input; threshold for peak limit is 0V; peak current limit reached when PKLMT voltage falls below 0V. |
| 3 | CAOUT | output | Output of wide bandwidth current amplifier that senses line current and commands the PWM to force correct duty cycle; compensation components placed between CAOUT and MOUT. |
| 4 | CAI | input | Current amplifier noninverting input; place resistor between this pin and the GND side of current sense resistor; input remains functional below GND. |
| 5 | MOUT | bidirectional | Output of analog multiplier and inverting input of current amplifier; high-impedance input for differential amplifier configuration; multiplier output current limited to 2×IAC. |
| 6 | IAC | input | Analog multiplier input representing instantaneous rectified line voltage; current proportional to input voltage; recommended maximum current is 500µA. |
| 7 | VAOUT | output | Output of voltage amplifier that regulates output voltage; internally limited to approximately 5.5V to prevent overshoot. |
| 8 | VFF | input | Feed-forward voltage input; RMS voltage signal generated by mirroring 1/2 of IAC into single pole external filter; at low line should be 1.4V. |
| 9 | VREF | power_out | Accurate 7.5V voltage reference output capable of delivering 20mA to peripheral circuitry; internally short-circuit limited; disabled and remains at 0V when VCC below UVLO threshold. |
| 10 | OVP/EN | input | Window comparator input for overvoltage protection and enable function; disables output driver if boost output voltage exceeds programmed level; resets soft-start if pulled below 1.9V typical. |
| 11 | VSENSE | input | Voltage amplifier inverting input; normally connected to compensation network and boost converter output through resistor divider network. |
| 12 | RT | input | Oscillator charging current input; resistor from RT to GND programs oscillator charging current and frequency; TI recommends 10kΩ to 100kΩ; nominal voltage 3V. |
| 13 | SS | input | Soft-start input; external capacitor charged to slowly increase PWM duty cycle during start-up enabling voltage amplifier output to increase gradually; discharged for VCC low conditions. |
| 14 | CT | input | Oscillator timing capacitor input; capacitor from CT to GND sets PWM oscillator frequency; lead should be short and direct to GND. |
| 15 | VCC | power_in | Positive supply voltage input; connect to stable source of at least 20mA from 10V to 17V for normal operation; bypass to GND with 0.1µF or larger ceramic capacitor. |
| 16 | DRVOUT | output | Gate drive output for boost switch; totem-pole MOSFET gate driver with ±1.2A peak current capability; series gate current-limiting resistor recommended to prevent overshoot on capacitive loads. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16 |
| Category | Power Management (PMIC) |
| Pins | 16 |
CAD (KiCad official)
- Symbol:
UCC3818ADR - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16 (KiCad packages3D, STEP)
- 3D model files:
ucc3818adr-etched.step/ucc3818adr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ucc3818adr.step/ucc3818adr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (39 pp, sha256
bd38dec546e1e7ad, retrieved 2026-09-23, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.2, primaryclaude-haiku-4-5-20251001(text), consensusclaude-sonnet-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).