# LM20143MHX

**Texas Instruments** · DC-DC Converters · HTSSOP-16-EP

LM20143MHX from Texas Instruments, in a HTSSOP-16-EP. 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 | SS/TRK | input | Soft-start or tracking control input; an internal 5-µA source charges an external capacitor to set the soft-start ramp, an external source below 800 mV overrides the internal reference, and leaving it open activates an internal 1-ms soft-start. |
| 2 | FB | input | Feedback input to the inverting input of the internal transconductance error amplifier, which regulates against an 800-mV reference. |
| 3 | PGOOD | output | Open-drain power good output indicating the output voltage is regulating within tolerance. |
| 4 | COMP | output | External compensation pin; the compensation resistor and capacitor network connects to this pin. |
| 5 | NC | unconnected | No internal connection; the pin may be left open, but TI strongly recommends connecting it to ground. |
| 6 | PVIN | power_in | Input voltage to the internal power switches, specified 2.95 V to 5.5 V for PVIN to GND; connect with pin 7 at the device and place a low-ESR capacitor near these pins. |
| 7 | PVIN | power_in | Input voltage to the internal power switches, specified 2.95 V to 5.5 V for PVIN to GND; connect with pin 6 at the device and place a low-ESR capacitor near these pins. |
| 8 | SW | power_out | Switch pin, the PWM output of the internal power switches. |
| 9 | SW | power_out | Switch pin, the PWM output of the internal power switches. |
| 10 | PGND | power_in | Power ground for the internal power switches. |
| 11 | PGND | power_in | Power ground for the internal power switches. |
| 12 | EN | input | Precision enable input; an external voltage divider sets the turn-on threshold, and the pin should be connected to PVIN if not used. |
| 13 | VCC | power_out | Internal 2.7-V sub-regulator output that should be bypassed with a 1-µF ceramic capacitor. |
| 14 | AVIN | power_in | Analog input supply that generates the internal bias, specified 2.95 V to 5.5 V; it must be connected to VIN through a low-pass RC filter. |
| 15 | AGND | power_in | Quiet analog ground for the internal bias circuitry. |
| 16 | RT | input | Frequency adjust pin; a resistor connected from this pin to ground sets the oscillator frequency, adjustable from 500 kHz to 1.5 MHz. |
| 17 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | HTSSOP-16-EP |
| Category | Power Supply Chip |
| Pins | 17 |

## CAD (KiCad official)

- Symbol: `LM20143MHX`
- Footprint: `Package_SO:TSSOP-16-1EP_4.4x5mm_P0.65mm`
- 3D model: HTSSOP-16-EP (KiCad packages3D, STEP)
- 3D model files: `lm20143mhx-etched.step` / `lm20143mhx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lm20143mhx.step` / `lm20143mhx.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/lm20143) (39 pp, sha256 `06701a42cb706b14`, retrieved 2026-10-12, 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/lm20143mhx-datasheet.pdf)