# TPS51396ARJER

**Texas Instruments** · DC-DC Converters · QFN-20-EP(3x3)

TPS51396ARJER from Texas Instruments, in a QFN-20-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 | BST | power_in | Supply input for gate drive voltage of high-side MOSFET; connect 0.1 μF bootstrap capacitor between BST and SW. |
| 2 | VIN | power_in | Input voltage supply pin for control circuitry rated 4.5V to 24V; connect input decoupling capacitors between VIN and GND. |
| 3 | VIN | power_in | Input voltage supply pin for control circuitry rated 4.5V to 24V; connect input decoupling capacitors between VIN and GND. |
| 4 | VIN | power_in | Input voltage supply pin for control circuitry rated 4.5V to 24V; connect input decoupling capacitors between VIN and GND. |
| 5 | VIN | power_in | Input voltage supply pin for control circuitry rated 4.5V to 24V; connect input decoupling capacitors between VIN and GND. |
| 6 | SW | output | Switch node terminal; connect output inductor to this pin. |
| 7 | GND | power_in | Power ground terminal for controller circuit and internal circuitry. |
| 8 | GND | power_in | Power ground terminal for controller circuit and internal circuitry. |
| 9 | PGOOD | output | Open drain power good indicator asserted low if output voltage out of threshold, overvoltage, thermal shutdown, EN shutdown, or soft start condition. |
| 10 | NC | unconnected | Not connected; can be connected to GND plane for improved thermal performance. |
| 11 | SS | input | Soft-start time selection pin; external capacitor sets timing with 1.3 ms default if not connected. |
| 12 | EN | input | Digital input enable pin to turn on/off buck converter with internal pull-down current when left open. |
| 13 | AGND | power_in | Analog ground; connect to GND plane with short trace. |
| 14 | FB | input | Converter feedback input connected to center tap of resistor divider between output voltage and AGND. |
| 15 | MODE | input | Light load operation mode selection pin; connect to resistor divider from VCC and AGND per table 7-1. |
| 16 | NC | unconnected | Not connected; can be connected to GND plane for improved thermal performance. |
| 17 | VCC | power_in | 5.0V internal LDO output supplying voltage to internal circuitry and gate driver; bypass with 1 μF capacitor. |
| 18 | GND | power_in | Power ground terminal for controller circuit and internal circuitry. |
| 19 | SW | output | Switch node terminal; connect output inductor to this pin. |
| 20 | SW | output | Switch node terminal; connect output inductor to this pin. |
| 21 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | QFN-20-EP(3x3) |
| Category | Power Management (PMIC) |
| Pins | 21 |

## CAD (KiCad official)

- Symbol: `TPS51396ARJER`
- Footprint: `Package_DFN_QFN:UQFN-20-1EP_3x3mm_P0.4mm_EP1.85x1.85mm`
- 3D model: QFN-20-EP(3x3) (KiCad packages3D, STEP)
- 3D model files: `tps51396arjer-etched.step` / `tps51396arjer-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tps51396arjer.step` / `tps51396arjer.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/tps51396a) (33 pp, sha256 `886c9ef21f4b86f1`, retrieved 2026-10-03, 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 0.3`, 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/tps51396arjer-datasheet.pdf)