component
UC3854BDW
Public Made by Adomby adom
Texas Instruments AC-DC Controllers And Regulators, SOIC-16-300mil. Pinout reviewed by a person 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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Contents
README
markdownUC3854BDW
Texas Instruments · AC-DC Controllers And Regulators · SOIC-16-300mil
UC3854BDW from Texas Instruments, in a SOIC-16-300mil. 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; all bypass and timing capacitors connected to GND should have leads as short and direct as possible. |
| 2 | PKLMT | input | Peak limit input with 0.0 V threshold; connect to negative voltage on current sense resistor. |
| 3 | CAO | output | Current amplifier output serving as one of the PWM duty-cycle comparator inputs; output swings from 0.1 V to 7.5 V. |
| 4 | ISENSE | input | Inverting input to current amplifier; inputs must not go below -0.5 V as they are protected with diodes to GND. |
| 5 | MOUT | bidirectional | Multiplier output and current amplifier non-inverting input combined; high-impedance node with IMOUT ≤ 2 × IAC. |
| 6 | IAC | input | Current input to multiplier, proportional to instantaneous line voltage; only multiplier input for line voltage sensing. |
| 7 | VAO | input | Voltage amplifier output. |
| 8 | VRMS | input | RMS voltage input to multiplier circuitry. |
| 9 | VREF | output | Reference voltage output used to set peak limit point and as internal reference; must be present for device operation. |
| 10 | ENA | input | Enable input; device begins operating above 2.65 V nominal and shuts off below 2.15 V nominal. |
| 11 | VSENSE | input | Output feedback input that goes into voltage error amplifier; amplifier output is one of multiplier circuit inputs. |
| 12 | RSET | input | Programmable resistor from RSET to ground sets oscillator charging current and multiplier limit. |
| 13 | SS | input | Soft-start pin; remains at GND when disabled, pulled up to over 3 V by internal 14 µA source when enabled. |
| 14 | CT | input | Capacitor from CT to GND sets the PWM oscillator frequency. |
| 15 | VCC | power_in | Positive supply rail. |
| 16 | GTDRV | output | PWM gate driver output (1.5 A peak totem-pole MOSFET driver); use minimum 5 Ω series gate resistor to prevent overshoot. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16-300mil |
| Category | Power Management (PMIC) |
| Pins | 16 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply current, off | 250 | 400 | µA | CAO = 0 V, VAO = 0 V, VCC = VUVLO-0.3 V | 4 | ||
| Supply current, on | 12 | 18 | mA | 4 | |||
| VCC turn-on threshold voltage (UCx854B) | 8 | 10.5 | 11.2 | V | 4 | ||
| VCC turn-off threshold voltage (UCx854B) | 7.8 | 10.3 | 11 | V | 4 | ||
| VCC hysteresis (UCx854B) | 0.1 | 0.22 | 0.5 | V | 4 | ||
| VCC clamp | 18 | 20 | 22 | V | IVCC = IVCC(on) + 5 mA | 4 | |
| Input voltage (voltage amplifier) | 2.9 | 3 | 3.1 | V | 4 | ||
| VSENSE bias current | -500 | -25 | 500 | nA | 4 | ||
| Open loop gain (voltage amplifier) | 70 | 100 | dB | 2 V ≤ VOUT ≤ 5 V | 4 | ||
| VOH high-level output voltage (voltage amplifier) | VOH | 6 | V | ILOAD = -500 µA | 4 | ||
| VOL low-level output voltage (voltage amplifier) | VOL | 0.3 | 0.5 | V | ILOAD = 500 µA | 4 | |
| ISC output short-circuit current (voltage amplifier) | ISC | 1.5 | 3.5 | mA | VOUT = 0 V | 4 | |
| Input offset voltage (current amplifier), TA = 25°C | -4 | 0 | mV | VCM = 0 V, TA = 25°C | 4 | ||
| Input offset voltage (current amplifier), overtemperature | -5.5 | 0 | mV | VCM = 0 V, Overtemperature | 4 | ||
| ISENSE input bias current | -500 | 500 | nA | VCM = 0 V | 4 | ||
| Open loop gain (current amplifier) | 80 | 110 | dB | 2 V ≤ VOUT = 6 V | 4 | ||
| VOH high-level output voltage (current amplifier) | VOH | 8 | V | ILOAD = -500 µA | 4 | ||
| VOL low-level output voltage (current amplifier) | VOL | 0.3 | 0.5 | V | ILOAD = 500 µA | 4 | |
| ISC output short-circuit current (current amplifier) | ISC | 1.5 | 3.5 | mA | VOUT = 0 V | 4 | |
| Common mode rejection range | CMRR | -0.3 | 5 | V | 4 | ||
| Gain bandwidth product (current amplifier) | 3 | 5 | MHz | f IN = 100 kHz, 10 mVp-p | 4 | ||
| Reference output voltage, TA = 25°C | 7.4 | 7.5 | 7.6 | V | IREF = 0 mA, TA = 25°C | 4 | |
| Reference output voltage | 7.35 | 7.5 | 7.65 | V | IREF = 0 mA | 4 | |
| Reference load regulation | 0 | 8 | 20 | mV | 1 mA ≤ IREF ≤ 10 mA | 4 | |
| Reference line regulation | 0 | 14 | 25 | mV | 12 V ≤ VCC ≤ 18 V | 4 | |
| Reference short circuit current | 25 | 35 | 60 | mA | VREF = 0 V | 4 | |
| Oscillator initial accuracy | 85 | 100 | 115 | kHz | TA = 25°C | 5 | |
| Oscillator total variation | 80 | 120 | kHz | Line, temperature | 5 | ||
| Oscillator ramp amplitude (peak-to-peak) | 4.9 | 5.9 | V | 5 | |||
| Oscillator ramp valley voltage | 0.8 | 1.3 | V | 5 | |||
| Enable threshold voltage | 2.35 | 2.55 | 2.8 | V | 5 | ||
| Enable hysteresis | 500 | 600 | mV | VFAULT = 2.5 V | 5 | ||
| Enable input bias current | -5 | -2 | µA | VENA = 0 V | 5 | ||
| Soft-start charge current | 10 | 14 | 24 | µA | VSS = 2.5 V | 5 | |
| Peak limit offset voltage | -15 | 15 | mV | 5 | |||
| Peak limit offset current | -200 | -100 | µA | VPKLMIT = -0.1 V | 5 | ||
| Multiplier output current, IA limited | -220 | -200 | -170 | µA | IAC = 100 µA, VRMS = 1 V, RSET = 10 kΩ | 5 | |
| Multiplier output current, zero | -2 | -0.2 | 2 | µA | IAC = 0 µA, RSET = 10 kΩ | 5 | |
| Multiplier output current, power limited | -230 | -200 | -170 | µA | VRMS = 1.5 V, Va = 6 V | 5 | |
| Multiplier gain constant | K | -1.1 | -1 | -0.9 | A/A | VRMS = 1.5 V, Va = 6 V, TA = 25°C | 5 |
| Gate driver VOH high-level output voltage | VOH | 12 | 12.8 | V | IOUT = -200 mA, VCC = 15 V | 5 | |
| Gate driver VOL low-level output voltage | VOL | 1 | 2.2 | V | IOUT = 200 mA | 5 | |
| Gate driver VOL low-level output voltage (light load) | VOL | 300 | 500 | mV | IOUT = 10 mA | 5 | |
| Low-level UVLO voltage | 0.9 | 1.5 | V | IOUT = 50 mA, VCC = 0 V | 5 | ||
| Supply voltage (recommended) | VCC | 10 | 20 | V | 3 | ||
| Operating junction temperature (UC3854X) | TJ | 0 | 70 | °C | UC3854X grade | 3 | |
| Supply voltage | VCC | 22 | V | 2 | |||
| GTDRV output current, continuous | IGTDRV | 0.5 | A | Continuous | 2 | ||
| GTDRV output current, 50% duty cycle | IGTDRV | 1.5 | A | 50% duty cycle | 2 | ||
| Input voltage (VSENSE, VRMS, ISENSE, MOUT) | 11 | V | 2 | ||||
| Input voltage (PKLMT) | 5 | V | 2 | ||||
| Input current (RSET, IAC, PKLMT, ENA) | 10 | mA | 2 | ||||
| Power dissipation | 1 | W | 2 | ||||
| Junction temperature | TJ | -55 | 150 | °C | 2 | ||
| Storage temperature | Tstg | -65 | 150 | °C | 2 | ||
| Lead temperature (soldering) | Tsol | 300 | °C | 1,6 mm (1/16 inch) from case, 10 s | 2 | ||
| Junction-to-ambient thermal resistance (DW, SOP-16) | θJA | 50 | 130 | °C/W | Five square inch FR4 PC board, one ounce copper; lower values for aluminum PC board | 3 | |
| Junction-to-case thermal resistance (DW, SOP-16) | θJC | 27 | °C/W | Worst case (mean +2s), MIL-STD-1835B basis | 3 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper | 14,400 square mils use the following values, dual-in-line, 11°C/W; flat pack and pin grid array, 10°C/W.are at the end of each trace. (2) θJA (junction-to-ambient) applies to devices mounted to five s | 3 |
CAD (KiCad official)
- Symbol:
UC3854BDW - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16-300mil (KiCad packages3D, STEP)
- 3D model files:
uc3854bdw-etched.step/uc3854bdw-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);uc3854bdw.step/uc3854bdw.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (29 pp, sha256
20dbe220bdb2dfe8, retrieved 2026-10-21, tier: lcsc) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).