# TP8556N

**TPOWER** · LED Drivers · SOT-23-6L

TP8556N from TPOWER, in a SOT-23-6L. 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 | DRV | output | Gate drive output for the external power MOSFET; the datasheet rates the driver at 550 mA maximum pull-up and 350 mA maximum pull-down current. |
| 2 | GND | power_in | Chip ground reference; the CS sense resistor is connected between CS and this pin. |
| 3 | MODE | input | High/low brightness mode select: high selects 50% output and low selects 100%, with a 100nF filter capacitor to GND required in brightness-switching applications; the pin must not float and must be tied to VDD or GND when unused, with VMODE_H of 2.0 V minimum, VMODE_L of 0.5 V maximum, and a -0.3 to +7 V absolute range. |
| 4 | VDD | power_in | Supply input with a built-in 5.6 V zener clamp; the datasheet gives an absolute limit of -0.3 to +6 V, an undervoltage lockout of 3.1 V rising and 2.7 V falling, and a supply current of 405 µA typical at 5 V, and recommends a series supply resistor when the input exceeds 5.6 V. |
| 5 | DIM | input | Analog dimming input that sets LED current over 0.3 to 1.5 V, with dimming off at 0.15 V and on at 0.2 V, and an internal 18 µA pull-up current; the absolute limit is -0.3 to +6 V. |
| 6 | CS | input | Output current sense pin; the average LED current sense resistor is connected between CS and GND, with a sense threshold of 300 mV at 100% brightness and 150 mV at 50%, and an absolute limit of -0.3 to +6 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TPOWER |
| Package | SOT-23-6L |
| Category | LED Drivers |
| Pins | 6 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage (normal operation) | VIN | 5 |  | 100 | V | 正常工作 (normal operation) | 3 |
| Output current (normal operation) | ILED | 3 |  | 6 | A | 正常工作 (normal operation) | 3 |
| VDD, CS, DRV, DIM to GND voltage |  | -0.3 |  | 6 | V |  | 2 |
| MODE to GND voltage |  | -0.3 |  | 7 | V |  | 2 |
| Power dissipation |  |  |  | 0.5 | W | 注 2 | 2 |
| Operating junction temperature range |  | -40 |  | 150 | ℃ |  | 2 |
| Storage temperature range |  | -40 |  | 150 | ℃ |  | 2 |
| ESD level (HBM) |  |  |  | 2000 | V |  | 2 |
| ESD level (MM) |  |  |  | 200 | V |  | 2 |
| DIM analog dimming voltage range | VDIM | 0.3 |  | 1.5 | V |  | 3 |
| VDD clamp voltage | VDD_CLP |  | 5.6 |  | V |  | 3 |
| Static operating current | ISTB |  | 405 |  | μA | VDD=5V | 3 |
| Undervoltage lockout threshold (VDD rising) | VUVLO |  | 3.1 |  | V | VDD 上升 | 3 |
| Undervoltage lockout hysteresis | VUVLO,HYS |  | 2.7 |  | V | VDD 下降 | 3 |
| Average current sense threshold at 100% brightness | VREF_100% |  | 300 |  | mV |  | 3 |
| Average current sense threshold at 50% brightness | VREF_50% |  | 150 |  | mV |  | 3 |
| Fixed off time at 100% brightness output | TOFF |  | 4.4 |  | μs | 100%亮度输出 (100% brightness output) | 3 |
| Power switch leading-edge blanking time | TLEB |  | 200 |  | ns |  | 3 |
| Maximum operating frequency | FSW_MAX |  | 220 |  | kHz |  | 3 |
| MODE pull-down resistance | RMODE |  | 50 |  | KΩ |  | 3 |
| MODE input high level | VMODE_H |  | 2 |  | V |  | 3 |
| MODE input low level | VMODE_L |  | 0.5 |  | V |  | 3 |
| MODE high-level clamp voltage | VMODE_CLP |  | 6.5 |  | V |  | 3 |
| DIM pull-up current | IDIM |  | 18 |  | μA |  | 3 |
| DIM analog dimming off voltage | VDIM_OFF |  | 0.15 |  | V |  | 3 |
| DIM analog dimming on voltage | VDIM_ON |  | 0.2 |  | V |  | 3 |
| Maximum gate drive source (pull-up) current | ISOURCE |  | 550 |  | mA |  | 3 |
| Maximum gate drive sink (pull-down) current | ISINK |  | 350 |  | mA |  | 3 |
| Output current smart thermal control start temperature | TST |  | 130 |  | ℃ |  | 3 |
| Overtemperature protection threshold | TSD |  | 150 |  | ℃ |  | 3 |
| Overtemperature protection hysteresis | THYS |  | 130 |  | ℃ |  | 3 |

## CAD (KiCad official)

- Symbol: `TP8556N`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6L (KiCad packages3D, STEP)
- 3D model files: `tp8556n-etched.step` / `tp8556n-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tp8556n.step` / `tp8556n.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [TPOWER datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603384150515081216) (6 pp, sha256 `508fd1ab8b5f5e16`, retrieved 2026-10-17, 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-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/tp8556n-datasheet.pdf)