LM5155QDSSTQ1

Texas Instruments · DC-DC Controllers · WSON-12-EP(2x3)

LM5155QDSSTQ1 from Texas Instruments, in a WSON-12-EP(2x3). 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	BIAS	power_in	Supply input for the internal VCC regulator; connect a bypass capacitor between this pin and PGND, with BIAS rated 3.5V to 45V (2.97V to 16V when tied to VCC) and 50V absolute maximum.
2	VCC	power_out	Output of the internal VCC regulator and supply input for the MOSFET driver; connect a ceramic bypass capacitor between this pin and PGND, with a recommended value of 1µF to 4.7µF and VCC regulation of 6.85V typical.
3	GATE	output	Gate drive output for the N-channel MOSFET, connected through a short, low-inductance path directly to the MOSFET gate, capable of sinking or sourcing 1.5A peak.
4	PGND	power_in	Power ground, connected through a wide, short, low-inductance path directly to the ground connection of the current sense resistor.
5	CS	input	Current sense input, connected through a short path to the positive side of the current sense resistor, with a 100mV (±7%) current limit threshold referenced to PGND.
6	COMP	output	Output of the internal transconductance error amplifier; connect the loop compensation network between this pin and PGND, with the COMP pin voltage clamped internally.
7	AGND	power_in	Analog ground, connected through a wide, short path to the analog ground plane; the exposed pad must be tied to AGND.
8	FB	input	Inverting input of the error amplifier, fed from the output resistor divider with a 1V reference and a 3.8V absolute maximum rating; the low-side feedback resistor connects to AGND.
9	SS	input	Soft-start timing pin; an external capacitor to AGND and the internal 10µA current source set the ramp rate of the internal error amplifier reference, with a 3.8V absolute maximum rating.
10	RT	input	Switching frequency set pin; a single resistor between RT and AGND programs the switching frequency from 100kHz to 2.2MHz, with the RT regulator holding this pin at 0.5V when enabled.
11	PGOOD	output	Open-drain power-good indicator that goes low when FB is below the undervoltage threshold; connect a pull-up resistor to the system rail (minimum 10kΩ recommended) and do not exceed VBIAS + 0.3V.
12	UVLO/EN/SYNC	input	Line undervoltage lockout programming pin set by a resistor divider from the supply, which also accepts negative pulses for clock synchronization; it must not be left floating and should be connected to BIAS when unused.
13	EP	passive	Exposed pad (from the footprint; not named in the datasheet pin table).

Key specifications

Parameter	Value
Manufacturer	Texas Instruments
Package	WSON-12-EP(2x3)
Category	Power Supply Chip
Pins	13

CAD (KiCad official)

Symbol: LM5155QDSSTQ1
Footprint: Package_SON:WSON-12-1EP_3x2mm_P0.5mm_EP1x2.65
3D model: WSON-12-EP(2x3), generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.75 mm nominal WSON height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
3D model files: lm5155qdsstq1-etched.step / lm5155qdsstq1-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm5155qdsstq1.step / lm5155qdsstq1.glb are the bare package body.

Provenance

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

Datasheet: Texas Instruments datasheet (50 pp, sha256 a8503f9fa4bec785, retrieved 2026-10-08, 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-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

# LM5155QDSSTQ1

**Texas Instruments** · DC-DC Controllers · WSON-12-EP(2x3)

LM5155QDSSTQ1 from Texas Instruments, in a WSON-12-EP(2x3). 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 | BIAS | power_in | Supply input for the internal VCC regulator; connect a bypass capacitor between this pin and PGND, with BIAS rated 3.5V to 45V (2.97V to 16V when tied to VCC) and 50V absolute maximum. |
| 2 | VCC | power_out | Output of the internal VCC regulator and supply input for the MOSFET driver; connect a ceramic bypass capacitor between this pin and PGND, with a recommended value of 1µF to 4.7µF and VCC regulation of 6.85V typical. |
| 3 | GATE | output | Gate drive output for the N-channel MOSFET, connected through a short, low-inductance path directly to the MOSFET gate, capable of sinking or sourcing 1.5A peak. |
| 4 | PGND | power_in | Power ground, connected through a wide, short, low-inductance path directly to the ground connection of the current sense resistor. |
| 5 | CS | input | Current sense input, connected through a short path to the positive side of the current sense resistor, with a 100mV (±7%) current limit threshold referenced to PGND. |
| 6 | COMP | output | Output of the internal transconductance error amplifier; connect the loop compensation network between this pin and PGND, with the COMP pin voltage clamped internally. |
| 7 | AGND | power_in | Analog ground, connected through a wide, short path to the analog ground plane; the exposed pad must be tied to AGND. |
| 8 | FB | input | Inverting input of the error amplifier, fed from the output resistor divider with a 1V reference and a 3.8V absolute maximum rating; the low-side feedback resistor connects to AGND. |
| 9 | SS | input | Soft-start timing pin; an external capacitor to AGND and the internal 10µA current source set the ramp rate of the internal error amplifier reference, with a 3.8V absolute maximum rating. |
| 10 | RT | input | Switching frequency set pin; a single resistor between RT and AGND programs the switching frequency from 100kHz to 2.2MHz, with the RT regulator holding this pin at 0.5V when enabled. |
| 11 | PGOOD | output | Open-drain power-good indicator that goes low when FB is below the undervoltage threshold; connect a pull-up resistor to the system rail (minimum 10kΩ recommended) and do not exceed VBIAS + 0.3V. |
| 12 | UVLO/EN/SYNC | input | Line undervoltage lockout programming pin set by a resistor divider from the supply, which also accepts negative pulses for clock synchronization; it must not be left floating and should be connected to BIAS when unused. |
| 13 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WSON-12-EP(2x3) |
| Category | Power Supply Chip |
| Pins | 13 |

## CAD (KiCad official)

- Symbol: `LM5155QDSSTQ1`
- Footprint: `Package_SON:WSON-12-1EP_3x2mm_P0.5mm_EP1x2.65`
- 3D model: WSON-12-EP(2x3), generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.75 mm nominal WSON height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files: `lm5155qdsstq1-etched.step` / `lm5155qdsstq1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm5155qdsstq1.step` / `lm5155qdsstq1.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/lm5155-q1) (50 pp, sha256 `a8503f9fa4bec785`, retrieved 2026-10-08, 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-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/lm5155qdsstq1-datasheet.pdf)