# LM5158QRTERQ1

**Texas Instruments** · DC-DC Converters · WQFN-16(3x3)

LM5158QRTERQ1 from Texas Instruments, in a WQFN-16(3x3). 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 | PGND | power_in | Power ground pin, source connection of the internal N-channel power MOSFET. |
| 2 | VCC | power_out | Output of the internal VCC regulator and supply voltage input of the internal MOSFET driver; connect 1µF ceramic bypass capacitor to PGND. |
| 3 | BIAS | power_in | Supply voltage input to the VCC regulator with operating range 3.2V to 60V (absolute maximum 65V); connect bypass capacitor to PGND. |
| 4 | PGOOD | output | Open-drain power-good indicator that goes low when FB is below the undervoltage threshold (VUVTH); connect pullup resistor to system voltage. |
| 5 | RT | input | Switching frequency setting pin; connect external resistor to AGND to program frequency from 100kHz to 2.2MHz. |
| 6 | EN/UVLO/SYNC | input | Multi-function input for enable control, undervoltage lockout programming, and external clock synchronization; must not be left floating. |
| 7 | AGND | power_in | Analog ground pin; connect to the analog ground plane through a wide and short path. |
| 8 | COMP | output | Output of the internal transconductance error amplifier; connect loop compensation components between this pin and AGND. |
| 9 | FB | input | Inverting input of the error amplifier; connect voltage divider to set output voltage in boost, SEPIC, or primary-side regulated flyback topologies. |
| 10 | SS | input | Soft-start time programming pin; external capacitor and internal 10µA current source set the ramp rate during soft start. |
| 11 | MODE | input | Mode selection input; program spread spectrum and hiccup mode protection via external resistor (37.4kΩ, 62kΩ, or 100kΩ) or voltage level (0V, 370mV, 620mV, or >1V). |
| 12 | NC | unconnected | No internal electrical contact. |
| 13 | SW | output | Switch output pin; drain connection of the internal N-channel power MOSFET. |
| 14 | SW | output | Switch output pin; drain connection of the internal N-channel power MOSFET. |
| 15 | NC | unconnected | No internal electrical contact. |
| 16 | PGND | power_in | Power ground pin, source connection of the internal N-channel power MOSFET. |
| 17 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WQFN-16(3x3) |
| Category | Power Management (PMIC) |
| Pins | 17 |

## CAD (KiCad official)

- Symbol: `LM5158QRTERQ1`
- Footprint: `Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm`
- 3D model: WQFN-16(3x3) (KiCad packages3D, STEP)
- 3D model files: `lm5158qrterq1-etched.step` / `lm5158qrterq1-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm5158qrterq1.step` / `lm5158qrterq1.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/lm5158-q1) (45 pp, sha256 `c10929600ea42a9c`, retrieved 2026-09-27, 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 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (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/lm5158qrterq1-datasheet.pdf)