# TPS54140DGQ

**Texas Instruments** · DC-DC Converters · MSOP-10-EP

TPS54140DGQ from Texas Instruments, in a MSOP-10-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 | BOOT | output | A bootstrap capacitor is required between the BOOT and PH pins; if the voltage on this capacitor falls below the device minimum, the output is forced off until the capacitor is refreshed. |
| 2 | VIN | power_in | Input supply voltage pin, specified for 3.5 V to 42 V operation. |
| 3 | EN | input | Enable pin with internal pullup current source; pull below 1.2 V to disable, float to enable, and use two resistors to set the input undervoltage lockout. |
| 4 | SS/TR | input | Slow-start and tracking pin where an external capacitor sets the output rise time; because its voltage overrides the internal reference, it can be used for tracking and sequencing. |
| 5 | RT/CLK | input | Resistor timing and external clock pin: an external resistor to ground sets the switching frequency, and pulling the pin above the PLL upper threshold makes it a high-impedance synchronization input. |
| 6 | PWRGD | output | Open-drain power-good output that is asserted low when the output is low due to thermal shutdown, dropout, overvoltage, or EN shutdown (sink current limited to 10 mA). |
| 7 | VSENSE | input | Inverting node of the transconductance (gm) error amplifier; absolute maximum rating is -0.3 V to 3 V. |
| 8 | COMP | output | Error amplifier output and input to the output-switch current comparator; frequency compensation components connect to this pin (absolute maximum rating -0.3 V to 3 V). |
| 9 | GND | power_in | Ground pin, which must be electrically connected to the exposed PowerPAD on the printed circuit board for proper operation. |
| 10 | PH | output | Source of the internal high-side power MOSFET; absolute maximum output voltage is -0.6 V to 47 V (-2 V for 10-ns transients). |
| 11 | Thermal Pad | power_in | Exposed PowerPAD that must be electrically connected to the GND pin/PCB ground plane for proper operation; PAD-to-GND voltage difference is limited to ±200 mV. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | MSOP-10-EP |
| Category | Power Management (PMIC) |
| Pins | 11 |

## CAD (KiCad official)

- Symbol: `TPS54140DGQ`
- Footprint: `Package_SO:MSOP-10-1EP_3x3mm_P0.5mm_EP1.68x1.88mm`
- 3D model: MSOP-10-EP (KiCad packages3D, STEP)
- 3D model files: `tps54140dgq-etched.step` / `tps54140dgq-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tps54140dgq.step` / `tps54140dgq.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/tps54140) (55 pp, sha256 `b1aa27b28e4a5124`, retrieved 2026-10-08, 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/tps54140dgq-datasheet.pdf)