# TPS53321RGTT

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

TPS53321RGTT 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 with a 1.35-MΩ resistor. |
| 2 | SYNC | bidirectional | Synchronization signal for input interleaving; master sends 180° out-of-phase signal to slave, and SYNC frequency must be within ±20% of slave nominal frequency. |
| 3 | PGD | output | Open-drain power good output flag, pulled up to an external rail through a resistor. |
| 4 | VBST | power_in | Supply input for high-side MOSFET (bootstrap terminal), with a capacitor connected from this pin to SW. |
| 5 | SW | bidirectional | Output inductor connection to integrated power devices. |
| 6 | SW | bidirectional | Output inductor connection to integrated power devices. |
| 7 | SW | bidirectional | Output inductor connection to integrated power devices. |
| 8 | PS | input | Mode configuration pin (10-µA current): ground = FCCM slave, high/floating = FCCM master, 24.3 kΩ = DE slave, 57.6 kΩ = HEF mode, 105 kΩ = reserved, 174 kΩ = DE master. |
| 9 | COMP | output | Error amplifier compensation terminal; Type III compensation is recommended for stability. |
| 10 | FB | input | Voltage feedback input, also used for OVP, UVP, and PGD determination. |
| 11 | AGND | power_in | Device analog ground terminal. |
| 12 | VDD | power_in | Input bias supply for analog functions, 2.9 V to 3.5 V recommended. |
| 13 | VIN | power_in | Gate driver supply and power conversion voltage input, 2.9 V to 6 V. |
| 14 | VIN | power_in | Gate driver supply and power conversion voltage input, 2.9 V to 6 V. |
| 15 | PGND | power_in | IC power ground terminal. |
| 16 | PGND | power_in | IC power ground terminal. |
| 17 | PGND | power_in | Thermal pad, connected to PGND per the typical application circuit. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `TPS53321RGTT`
- 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: `tps53321rgtt-etched.step` / `tps53321rgtt-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tps53321rgtt.step` / `tps53321rgtt.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/tps53321) (28 pp, sha256 `e4f58bb337095e37`, retrieved 2026-10-07, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (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/tps53321rgtt-datasheet.pdf)