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UC3854BDW

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Texas Instruments AC-DC Controllers And Regulators, SOIC-16-300mil. Pinout reviewed by a person against the datasheet, KiCad symbol/footprint/3D.

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UC3854BDW

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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc3854bdw.step / uc3854bdw.glb are 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).

Datasheet PDF