# INK1105DN

**Cross chip** · LED Drivers · DFN-8-EP(2x2)

INK1105DN from Cross chip, in a DFN-8-EP(2x2). 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 | LED drive pin; the datasheet gives a maximum DRV pin voltage of 7.0 V and a maximum DRV pin current of 800 mA. |
| 2 | VCC | power_in | Supply pin with built-in reverse-polarity protection, so no external protection device is needed; absolute range is -6.0 V to 6.0 V. |
| 3 | VREF | power_out | 2.1 V reference voltage output with a maximum load capability of 1 mA. |
| 4 | DIM | input | Dimming control pin for analog or digital dimming; in analog mode its voltage is attenuated 5x, and in digital mode it is compared with the CT pin voltage to produce the PWM signal. |
| 5 | FS0 | input | Dimming function select pin with an internal pull-up resistor. |
| 6 | CT | passive | Digital dimming frequency or flash frequency setting pin; a capacitor connected here sets the frequency. |
| 7 | FS1 | input | Dimming function select pin with an internal pull-up resistor. |
| 8 | FB | input | Feedback pin; a resistor connected from this pin to ground sets the LED drive current. |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Cross chip |
| Package | DFN-8-EP(2x2) |
| Category | LED Drivers |
| Pins | 9 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Operating supply voltage range | VCC | 2.2 |  | 5.5 | V |  | 3 |
| Static supply current | ICC | 500 | 1000 | 1500 | uA | DIM 悬空，VCC=5V，RFB=5Ω, VDRV=2V | 3 |
| Reverse-connection supply current | ICCR | -50 | -10 |  | uA | VCC=-6V | 3 |
| Reference voltage output | VREFO | 2.05 | 2.1 | 2.15 | V | ILOAD=200uA | 3 |
| Supply regulation | %/dVCC |  | 0.1 | 0.3 | % |  | 3 |
| Load regulation | %/dIREF |  | 0.1 | 0.3 | % |  | 3 |
| Current-setting reference voltage | VREFI | 145 | 150 | 155 | mV | VDRV=0.5V, RFB=2Ω | 3 |
| Output saturation voltage | VSAT |  | 100 | 200 | mV | IOUT=200mA | 3 |
| Output current linear regulation | %/dVCC |  | 0.1 | 0.3 | % | RFB=2Ω，VDRV=2V，VCC=2.0~5.5V | 3 |
| Off-state output current | IOUT |  | 0.1 | 10 | μA | VDRV=7V， MODE=HIGH，DIM=0 | 3 |
| PWM frequency | FPWM | 400 | 500 | 600 | Hz | CT=100nF | 3 |
| PWM frequency adjustment range |  | 100 |  | 1000 | Hz |  | 3 |
| Duty cycle range |  | 0 |  | 100 | % | FPWM=200Hz | 3 |
| Oscillator source current | ISOURCE | 16 | 20 | 24 | μA |  | 3 |
| Oscillator sink current | ISINK | 16 | 20 | 24 | μA |  | 3 |
| 50% duty-cycle drive accuracy | D% | 49.5 | 50 | 50.5 | % | FS=0，A/D=0 | 3 |
| Recommended supply voltage | VCC | 2.3 |  | 5.5 | V |  | 3 |
| Recommended continuous drive current | IDD |  |  | 500 | mA |  | 3 |
| Recommended PWM frequency | FPWM | 0.1 |  | 1000 | Hz |  | 3 |
| Recommended ambient temperature | TA | -20 |  | 125 | °C |  | 3 |
| Supply voltage VCC (absolute maximum) | VCC | -6 |  | 6 | V |  | 2 |
| DRV pin drive voltage (absolute maximum) | VDRV |  |  | 7 | V |  | 2 |
| DRV pin drive current (absolute maximum) | IDRV |  |  | 800 | mA |  | 2 |
| Other pin voltage (absolute maximum) | VX | -0.3 |  | 6 | V |  | 2 |
| Continuous output current (absolute maximum) | IOUTC |  |  | 550 | mA |  | 2 |
| Thermal resistance, transistor junction to pin (DFN2X2) | Rth（j-s）2（DFN2X2） |  |  | 60 | °C/W |  | 2 |
| Maximum power dissipation (DFN2X2) | P(DMAX1)（DFN2X2） |  |  | 1200 | mW |  | 2 |
| Operating ambient temperature range (absolute maximum) | TA | -40 |  | 125 | °C |  | 2 |
| Operating junction temperature | TJ |  |  | 160 | °C |  | 2 |
| Storage temperature | TSTG | -55 |  | 150 | °C |  | 2 |
| ESD HBM rating | ESD(HBM) |  |  | 6000 | V |  | 2 |
| Oscillator high voltage | VH |  | 1.15 |  | V |  | 3 |
| Oscillator low voltage | VL |  | 0.15 |  | V |  | 3 |
| Overtemperature protection trigger temperature | TOTP |  | 150 |  | °C |  | 3 |
| Overtemperature protection release temperature | TOTPR |  | 130 |  | °C |  | 3 |

## CAD (KiCad official)

- Symbol: `INK1105DN`
- Footprint: `Package_DFN_QFN:DFN-8-1EP_2x2mm_P0.5mm_EP0.6x1.2mm`
- 3D model: DFN-8-EP(2x2) (KiCad packages3D, STEP)
- 3D model files: `ink1105dn-etched.step` / `ink1105dn-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ink1105dn.step` / `ink1105dn.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Cross chip datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588944756495409152) (7 pp, sha256 `54ff346554e24d9f`, retrieved 2026-10-18, 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/ink1105dn-datasheet.pdf)