# TPS23523PWR

**Texas Instruments** · Surge Protection Devices (SPDs) · TSSOP-16-175mil

TPS23523PWR from Texas Instruments, in a TSSOP-16-175mil. 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 | Neg48 | input | Input to the OR-ing controller for the -48 feed; the TPS23523 regulates the drop from VEE to Neg48 to 25 mV to mimic an ideal diode. |
| 2 | NC | unconnected | No connect to space high voltage pins. |
| 3 | GATE2 | output | Gate driver for the 2nd hot swap FET; NC if the feature is not used. |
| 4 | BGATE | output | Gate driver for the OR-ing FET. |
| 5 | VEE | power_in | This pin corresponds to the IC GND and provides Kelvin sense to the bottom of RSNS to ensure accurate current limit. |
| 6 | SNS | input | Sense pin used to measure and regulate current, with Kelvin sense to RSNS for accurate current limits. |
| 7 | GATE | output | Gate drive for the main hot swap FET. |
| 8 | SS | output | Soft-start pin; connect a capacitor CSS between SS and -48V_OUT, where the dv/dt on -48V_OUT is proportional to the gate sourcing current divided by CSS. |
| 9 | D | input | Senses the drain of the hot swap FET and programs the threshold where the hot swap switches between CL1 and CL2 through a resistor to the drain (-48V_OUT); pin current should be limited to < 1 mA through RD. |
| 10 | TMR | output | Timer pin that programs the duration the hot swap FET can remain in current limit, set by a capacitor between TMR and VEE. |
| 11 | OV | input | Input overvoltage comparator; a resistor divider programs the threshold where the device turns off on an overvoltage event. |
| 12 | UVEN | input | Input undervoltage comparator; a resistor divider programs the threshold where the device turns on. |
| 13 | VCC | power_in | Clamped supply pin, tied to RTN through a resistor; supply voltage is rated 0 to 20 V with current into VCC below 10 mA. |
| 14 | PGb | output | Power Good Bar open-drain output that goes low when the hot swap is fully on and the DC/DC can draw full power; output voltage is rated up to 200 V absolute maximum. |
| 15 | PROG | input | Adjusts current limit and fast trip threshold by tying to VEE, floating, or tying to VEE through a resistor. |
| 16 | Vref | power_in | 5 V reference output used to power current monitors and digital isolators, connected to the base of a BJT to generate a rail. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TSSOP-16-175mil |
| Category | Circuit Protection |
| Pins | 16 |

## CAD (KiCad official)

- Symbol: `TPS23523PWR`
- Footprint: `Package_SO:TSSOP-16_4.4x5mm_P0.65mm`
- 3D model: TSSOP-16-175mil (KiCad packages3D, STEP)
- 3D model files: `tps23523pwr-etched.step` / `tps23523pwr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tps23523pwr.step` / `tps23523pwr.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/tps23523.pdf) (38 pp, sha256 `341d988282de22e3`, retrieved 2026-10-28, 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/tps23523pwr-datasheet.pdf)