# TPS61165

**Texas Instruments** · LED driver · SOT-23-6

Boost converter built to drive a string of white LEDs at constant current, the classic backlight driver. It steps a 3 to 5.5 V input up to as much as 38 V to push current through several LEDs in series, holding the current constant so brightness stays even, and a single CTRL pin dims the string either by a simple PWM or by TI's EasyScale one-wire digital protocol. External FB and COMP set the current and loop. A compact backlight and indicator-string driver.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VIN | power_in | Input supply pin for the IC. Connect to a 3-V to 18-V supply with a ≥ 1 µF bypass capacitor. UVLO rising ~2.5 V with 70 mV hysteresis. |
| 2 | CTRL | input | Multifunction control pin for enable, one-wire EasyScale digital dimming, and PWM dimming (5 kHz-100 kHz). Logic high ≥ 1.2 V, logic low ≤ 0.4 V; internal 800-kΩ pull-down. Holding low > 2.5 ms shuts the device down. |
| 3 | SW | power_out | Switching node of the internal 40-V N-channel MOSFET (RDS(on) = 0.3 Ω typ, ILIM = 1.2 A). Connect the switched side of the boost inductor here; also senses output voltage for 38-V open-LED protection. |
| 4 | GND | power_in | Device ground return. Also the reference for the thermal pad, which should be soldered to the analog ground plane. |
| 5 | COMP | output | Output of the transconductance error amplifier. Connect an external capacitor (e.g. 220 nF) to compensate the loop; Gea = 320 umho typ, Rea = 6 MΩ. |
| 6 | FB | input | Feedback pin for LED current sensing. Connect the sense resistor (Rset) from FB to GND; regulated feedback voltage is 200 mV (typ, 2% accuracy). |

## Key specifications

| Parameter | Value |
|---|---|
| Type | White-LED boost driver (constant current) |
| Input | 3-5.5 V |
| Output | Up to 38 V (LED string) |
| Dimming | PWM or EasyScale 1-wire (CTRL) |
| Switch | Integrated |
| Current set | External (FB) |
| Package | SOT-23-6 |

## Ordering variants

Same part, different packaging or reel option.

- `TPS61165DBVR (SOT-23-6)`
- `TPS61165DBVT (SOT-23-6, small reel)`

## CAD (KiCad official)

- Symbol: `Driver_LED:TPS61165DBV (KiCad official)`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `tps61165-etched.step` / `tps61165-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tps61165.step` / `tps61165.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/tps61165.pdf) (38 pp, sha256 `d3515134b3388868`, retrieved 2026-08-17, tier: manufacturer)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/tps61165-datasheet.pdf)