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UC3845D

Public Made by Adom

by adom

Texas Instruments AC-DC Controllers And Regulators, SOIC-14. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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UC3845D

Texas Instruments · AC-DC Controllers And Regulators · SOIC-14

UC3845D from Texas Instruments, in a SOIC-14. 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 COMP output Error amplifier compensation pin for external compensation network connection to modify output voltage and enable pulse-by-pulse current limiting with internal current limit control.
2 NC unconnected No connection.
3 VFB input Error amplifier inverting input with -2µA input bias current accepting feedback voltage maximum 2.58V for voltage-loop control and closed-loop output regulation.
4 NC unconnected No connection.
5 ISENSE input Primary-side current-sense input to PWM comparator accepting maximum 1.0V nominal with -10µA input bias current and 150-300ns propagation delay for OUTPUT pulse termination.
6 NC unconnected No connection.
7 RT/CT bidirectional Oscillator timing pin with 1.7V peak-to-peak amplitude; connect timing resistor (5kΩ minimum) from VREF and timing capacitor (1nF to 100nF) to GROUND for programmable frequency 100-500kHz using fOSC = 1.72/(RRT×CCT).
8 PWRGND power_in Power stage ground providing high-current return path for output driver stage; requires direct connection to IC power devices for low-impedance connection.
9 GROUND power_in Analog signal ground serving as low-impedance reference for control circuits and power return path when separate PWRGND is not available.
10 OUTPUT output Gate driver output capable of sourcing and sinking ±1A peak current with 25-150ns rise and fall time for direct MOSFET gate drive; actively held low when VCC below turn-on threshold.
11 VC power_in Bias power supply input for output gate driver stage (14-pin SOIC variant only); requires bypass capacitor value at least 10 times the main switch FET gate capacitance.
12 VCC power_in Device power supply input requiring 12V to 28V operating range; total supply current equals static ICC (11-17mA) plus average output driver current; requires 0.1µF ceramic bypass capacitor.
13 NC unconnected No connection.
14 VREF power_in 5V ±2% precision reference voltage output (4.9-5.1V for UC384x) with 180mA short-circuit current capability, 50μV output noise, and 0.1µF ceramic bypass capacitor required.

Key specifications

Parameter Value
Manufacturer Texas Instruments
Package SOIC-14
Category Power Management (PMIC)
Pins 14

CAD (KiCad official)

  • Symbol: UC3845D
  • Footprint: Package_SO:SOIC-14_3.9x8.7mm_P1.27mm
  • 3D model: SOIC-14 (KiCad packages3D, STEP)
  • 3D model files: uc3845d-etched.step / uc3845d-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc3845d.step / uc3845d.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Texas Instruments datasheet (61 pp, sha256 0f875fd24cbb5fda, retrieved 2026-10-06, 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, primary claude-haiku-4-5-20251001 (text), consensus claude-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).

Datasheet PDF