# TPS53321RGTR

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

TPS53321RGTR from Texas Instruments, in a VQFN-16-EP(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 | EN | input | Enable input, internally pulled up to VDD through a 1.35-MΩ resistor, with a high threshold of 1.1 V to 1.3 V and 0.18 V to 0.24 V hysteresis; recommended range is -0.1 V to 6 V. |
| 2 | SYNC | bidirectional | Synchronization signal for input interleaving: the master sends a 180° out-of-phase signal to the slave, and the SYNC frequency must be within ±20% of the slave nominal frequency; recommended range is -0.1 V to 3.5 V. |
| 3 | PGD | output | Open-drain power-good output flag that must be pulled up to an external rail through a resistor; recommended range is -0.1 V to 6 V. |
| 4 | VBST | power_in | Supply input for the high-side MOSFET (bootstrap terminal); connect a capacitor from this pin to SW, with recommended VBST-to-SW range of -0.1 V to 6 V and VBST of -0.1 V to 13.5 V. |
| 5 | SW | bidirectional | Output inductor connection to the integrated power devices; recommended SW range is -1 V to 6.5 V. |
| 6 | SW | bidirectional | Output inductor connection to the integrated power devices; recommended SW range is -1 V to 6.5 V. |
| 7 | SW | bidirectional | Output inductor connection to the integrated power devices; recommended SW range is -1 V to 6.5 V. |
| 8 | PS | input | Mode configuration pin with a 10-µA pullup current: ground selects FCCM slave, 24.3 kΩ to GND selects DE slave, 57.6 kΩ selects HEF mode, 105 kΩ reserved, 174 kΩ selects DE master, and floating or high selects FCCM master; recommended range is -0.1 V to 3.5 V. |
| 9 | COMP | output | Error amplifier compensation terminal, where Type III compensation is recommended for stability; recommended range is -0.1 V to 3.5 V. |
| 10 | FB | input | Voltage feedback input also used for overvoltage, undervoltage and power-good determination, with recommended range of -0.1 V to 3.5 V. |
| 11 | AGND | power_in | Device analog ground terminal. |
| 12 | VDD | power_in | Input bias supply for analog functions, with 2.9 V to 3.5 V recommended (3.3 V nominal). |
| 13 | VIN | power_in | Gate driver supply and power conversion voltage input, with a 2.9 V to 6 V recommended range. |
| 14 | VIN | power_in | Gate driver supply and power conversion voltage input, with a 2.9 V to 6 V recommended range. |
| 15 | PGND | power_in | IC power ground terminal; recommended PGND range is -0.1 V to 0.1 V. |
| 16 | PGND | power_in | IC power ground terminal; recommended PGND range is -0.1 V to 0.1 V. |
| 17 | PGND Pad | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `TPS53321RGTR`
- Footprint: `Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm`
- 3D model: VQFN-16-EP(3x3) (KiCad packages3D, STEP)
- 3D model files: `tps53321rgtr-etched.step` / `tps53321rgtr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tps53321rgtr.step` / `tps53321rgtr.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/lit/ds/symlink/tps53321.pdf) (28 pp, sha256 `e4f58bb337095e37`, retrieved 2026-10-08, tier: manufacturer)
- **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/tps53321rgtr-datasheet.pdf)