UC2854BDWTR

Texas Instruments · AC-DC Controllers And Regulators · SOIC-16-300mil

UC2854BDWTR 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 for the device; bypass and timing capacitors should have leads as short and direct as possible, and all voltages are measured with respect to GND.
2	PKLMT	input	Peak limit threshold is 0.0 V; connect to the negative end of the current sense resistor, using a resistor to REF to offset the negative sense signal up to GND.
3	CAO	output	Output of the wide-bandwidth current amplifier and one input to the PWM duty-cycle comparator; the output can swing from 0.1 V to 7.5 V.
4	ISENSE	input	Switch current sense input, the inverting input of the current amplifier, which remains functional down to and below GND but should not be taken below -0.5 V because it is diode-protected to GND.
5	MOUT	bidirectional	Multiplier output and non-inverting current amplifier input, a high-impedance node that should not be taken below -0.5 V and must satisfy IMOUT ≤ 2 × IAC.
6	IAC	input	Current input to the multiplier proportional to the instantaneous line voltage; it is the only multiplier input to be used for sensing instantaneous line voltage.
7	VAO	input	Voltage amplifier output that forms the third input to the multiplier and is internally clamped to 6.0 V.
8	VRMS	input	Input for the RMS line voltage to the multiplier circuitry, with a linear operating range of 0 V to 5.5 V.
9	VREF	power_out	Internal reference voltage used to set the peak limit point and for various device functions; it must be present for the device to operate.
10	ENA	input	A nominal voltage above 2.65 V allows the device to begin operating, and the device shuts off if this pin falls below 2.15 V nominal.
11	VSENSE	input	Feedback input from the output that goes into the voltage error amplifier, whose output is another input to the multiplier.
12	RSET	input	A resistor from RSET to ground programs the oscillator charging current and sets the multiplier limit.
13	SS	input	Soft-start pin that is held at GND while the device is disabled or VCC is too low, pulls up to over 3 V through an internal 14-µA source when enabled, and sets the slow rise of the voltage-amplifier reference through an external capacitor.
14	CT	input	A capacitor from CT to GND sets the PWM oscillator frequency.
15	VCC	power_in	Positive supply rail for the device.
16	GTDRV	output	PWM output, a 1.5-A peak totem-pole MOSFET gate driver that requires a series gate resistor of at least 5 Ω to limit overshoot.

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	SOIC-16-300mil
Category	Power Management (PMIC)
Pins	16

CAD (KiCad official)

Symbol: UC2854BDWTR
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOIC-16-300mil (KiCad packages3D, STEP)
3D model files: uc2854bdwtr-etched.step / uc2854bdwtr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); uc2854bdwtr.step / uc2854bdwtr.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 2026-10-11, tier: lcsc)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (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

# UC2854BDWTR

**Texas Instruments** · AC-DC Controllers And Regulators · SOIC-16-300mil

UC2854BDWTR 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 for the device; bypass and timing capacitors should have leads as short and direct as possible, and all voltages are measured with respect to GND. |
| 2 | PKLMT | input | Peak limit threshold is 0.0 V; connect to the negative end of the current sense resistor, using a resistor to REF to offset the negative sense signal up to GND. |
| 3 | CAO | output | Output of the wide-bandwidth current amplifier and one input to the PWM duty-cycle comparator; the output can swing from 0.1 V to 7.5 V. |
| 4 | ISENSE | input | Switch current sense input, the inverting input of the current amplifier, which remains functional down to and below GND but should not be taken below -0.5 V because it is diode-protected to GND. |
| 5 | MOUT | bidirectional | Multiplier output and non-inverting current amplifier input, a high-impedance node that should not be taken below -0.5 V and must satisfy IMOUT ≤ 2 × IAC. |
| 6 | IAC | input | Current input to the multiplier proportional to the instantaneous line voltage; it is the only multiplier input to be used for sensing instantaneous line voltage. |
| 7 | VAO | input | Voltage amplifier output that forms the third input to the multiplier and is internally clamped to 6.0 V. |
| 8 | VRMS | input | Input for the RMS line voltage to the multiplier circuitry, with a linear operating range of 0 V to 5.5 V. |
| 9 | VREF | power_out | Internal reference voltage used to set the peak limit point and for various device functions; it must be present for the device to operate. |
| 10 | ENA | input | A nominal voltage above 2.65 V allows the device to begin operating, and the device shuts off if this pin falls below 2.15 V nominal. |
| 11 | VSENSE | input | Feedback input from the output that goes into the voltage error amplifier, whose output is another input to the multiplier. |
| 12 | RSET | input | A resistor from RSET to ground programs the oscillator charging current and sets the multiplier limit. |
| 13 | SS | input | Soft-start pin that is held at GND while the device is disabled or VCC is too low, pulls up to over 3 V through an internal 14-µA source when enabled, and sets the slow rise of the voltage-amplifier reference through an external capacitor. |
| 14 | CT | input | A capacitor from CT to GND sets the PWM oscillator frequency. |
| 15 | VCC | power_in | Positive supply rail for the device. |
| 16 | GTDRV | output | PWM output, a 1.5-A peak totem-pole MOSFET gate driver that requires a series gate resistor of at least 5 Ω to limit overshoot. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-16-300mil |
| Category | Power Management (PMIC) |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `UC2854BDWTR`
- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`
- 3D model: SOIC-16-300mil (KiCad packages3D, STEP)
- 3D model files: `uc2854bdwtr-etched.step` / `uc2854bdwtr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `uc2854bdwtr.step` / `uc2854bdwtr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/uc3854a) (29 pp, sha256 `20dbe220bdb2dfe8`, retrieved 2026-10-11, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (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](docs/uc2854bdwtr-datasheet.pdf)