# CAT3224HV3-GT2

**onsemi** · LED Drivers · TQFN-16-EP(3x3)

CAT3224HV3-GT2 from onsemi, in a TQFN-16-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 | RF | passive | Flash current setting resistor terminal; voltage regulated to 0.6 V in flash mode (FLASH high), with 3.5 mA typical current limit. |
| 2 | BAL | bidirectional | Active supercapacitor balance control connected to the center-point between the two supercapacitor cells, forced to half of the CAP voltage. |
| 3 | CAP | bidirectional | Supercapacitor positive connection; current sinks or sources from this pin to the capacitor depending on the mode of operation. |
| 4 | CAP | bidirectional | Supercapacitor positive connection; current sinks or sources from this pin to the capacitor depending on the mode of operation. |
| 5 | CHRG | input | Charge supercapacitor enable; when high, the 1x/2x charge pump is enabled and charges the supercapacitor (logic high 1.3 V min, low 0.4 V max, 150 k internal pull-down). |
| 6 | FLASH | input | Flash enable; when high the LED current sources are enabled in flash mode, and they are disabled automatically if FLASH stays high longer than 300 ms typical. |
| 7 | TORCH | input | Torch enable; when high the LED current sources are enabled in torch mode. |
| 8 | FLAG | output | Flash ready flag, active-low open-drain output that pulls low when the supercapacitor is fully charged and needs an external pull-up to a positive rail. |
| 9 | LEDB | passive | LED B channel anode (+) connection to an internal current source, independently regulated and high-impedance in shutdown or when FLASH and TORCH are low. |
| 10 | LEDA | passive | LED A channel anode (+) connection to an internal current source, independently regulated and high-impedance in shutdown or when FLASH and TORCH are low. |
| 11 | RC | passive | Charge current setting resistor terminal setting the VIN current limit in charge mode; regulated to 0.6 V when CHRG is high. |
| 12 | RT | passive | Torch current setting resistor terminal; voltage regulated to 0.6 V in torch mode (TORCH high). |
| 13 | VIN | power_in | Positive supply connection to the battery for the device and supercapacitor charger (2.0 to 5.5 V recommended), requiring a 1 µF ceramic bypass capacitor to ground. |
| 14 | CP | passive | Positive terminal of the ceramic bucket capacitor used in 2x charge pump mode. |
| 15 | CN | passive | Negative terminal of the ceramic bucket capacitor used in 2x charge pump mode. |
| 16 | GND | power_in | Device ground reference for the charge pump; must be connected to the PCB ground plane. |
| 17 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | TQFN-16-EP(3x3) |
| Category | Display Modules / LED Drivers / Display Drivers |
| Pins | 17 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| VIN, RC, RF, RT voltage |  | -0.3 |  | 6 | V | GND−0.3 to 6 | 2 |
| CAP, CP, CN voltage |  | -0.3 |  | 7 | V | GND−0.3 to 7 | 2 |
| CHRG, FLASH, TORCH, FLAG voltage |  | -0.3 |  | 6 | V | GND−0.3 to 6 | 2 |
| Storage Temperature Range |  | -65 |  | 160 | °C |  | 2 |
| Junction Temperature Range |  | -40 |  | 150 | °C |  | 2 |
| Lead Temperature |  |  |  | 300 | °C |  | 2 |
| ESD Rating HBM |  |  |  | 2000 | V | Human Body Model | 2 |
| ESD Rating MM |  |  |  | 200 | V | Machine Model | 2 |
| Operating supply voltage | VIN | 2 |  | 5.5 | V |  | 2 |
| Ambient Temperature Range |  | -40 |  | 85 | °C |  | 2 |
| LEDA, LEDB current (flash mode) |  |  |  | 2 | A | flash mode | 2 |
| LEDA, LEDB current (torch mode) |  | 10 |  | 200 | mA | torch mode | 2 |
| Input Current Limit |  |  |  | 1 | A |  | 2 |
| FLAG pull-up resistor current |  | 0 |  | 10 | mA |  | 2 |
| LED Forward Voltage Range | Vf | 1.3 |  | 4.2 | V |  | 2 |
| Thermal impedance junction to ambient | θJA |  | 42 |  | °C/W | TQFN 3x3 16-lead, 2 sq in copper on exposed pad | 2 |
| Transient thermal impedance | θJA |  | 7 |  | °C/W | 100 ms pulse at 5 W, 2 sq in copper | 2 |
| RSET Regulated Voltage | VRX | 0.59 | 0.6 | 0.61 | V | IRX = 0.1 mA | 3 |
| Active Balance Control (VCAP / 2) | VBAL | -2 |  | 2 | % | ±5 mA Load on BAL | 3 |
| Quiescent Current on VIN pin, CAP charged & idle | IQVIN |  |  | 80 | µA | CAP Charged & idle | 3 |
| Quiescent Current on VIN pin, charging 2x mode | IQVIN |  | 6 |  | mA | CAP Charging 2x Mode | 3 |
| Quiescent Current on CAP pin, charged & idle | IQCAP |  |  | 10 | µA | CAP Charged & idle | 3 |
| Quiescent Current on CAP pin, shutdown | IQCAP |  |  | 3 | µA | Shutdown mode | 3 |
| Quiescent Current on CAP pin, shutdown VIN = 0 V | IQCAP |  |  | 3 | µA | Shutdown, VIN = 0 V | 3 |
| Shutdown Current | IQSHDN |  |  | 1 | µA | CHRG = FLASH = TORCH = 0 V | 3 |
| Flash Gain (IFLASH / IRF) | GFLASH |  | 900 |  |  | IFLASH = 2 A | 3 |
| Torch Gain (ITORCH / IRT) | GTORCH |  | 120 |  |  | ITORCH = 200 mA | 3 |
| Input Current Limit Gain (ICHRG / IRC) | GCHARGE |  | 400 |  |  | ICHARGE = 400 mA | 3 |
| Rset Current limit | IRX_MAX |  | 3.5 |  | mA | VRX = 0 V | 3 |
| Input current limit in charge mode | IIN_MAX |  | 1.4 |  | A | VRC = 0 V | 3 |
| CAP Charge off voltage | VC_OFF |  | 5.4 |  | V | RC = 2 k | 3 |
| CAP Charge Hysteresis | VC_HYST |  | 0.2 |  | V |  | 3 |
| CAP voltage FLAG pulled low | VF_ON |  | 5.2 |  | V |  | 3 |
| CAP voltage FLAG Hysteresis | VF_HYST |  | 0.2 |  | V |  | 3 |
| LEDA/B Combined Dropout Resistance | RLEDAB |  | 110 |  | mΩ | IFLASHAB = 4 A | 3 |
| Charge Mode Resistance 1x mode | RCP |  | 2 |  | Ω | 1x mode | 3 |
| Charge Mode Resistance 2x mode | RCP |  | 4 |  | Ω | 2x mode, VIN = 3.5 V | 3 |
| Charge Pump Frequency | FOSC |  | 800 |  | kHz |  | 3 |
| Flash Timeout Duration | TFLASH |  | 300 |  | ms |  | 3 |
| Flag low voltage threshold (Open Drain) | VFLAG |  |  | 0.2 | V | FLAG Driven low 100 µA pull-up | 3 |
| CHRG, FLASH, TORCH Pin Internal Pull-down Resistor | REN |  | 150 |  | kΩ |  | 3 |
| CHRG, FLASH, TORCH Logic High Level | VEHI | 1.3 |  |  | V |  | 3 |
| CHRG, FLASH, TORCH Logic Low Level | VELO |  |  | 0.4 | V |  | 3 |
| Thermal Shutdown | TSD |  | 150 |  | °C |  | 3 |
| Thermal Hysteresis | THYS |  | 20 |  | °C |  | 3 |
| Undervoltage lockout threshold | VUVLO |  | 1.9 |  | V |  | 3 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper |  | 1. Pins can be driven above VIN with no leakage current or change in operation. 2. JA (Junction to Ambient thermal resistance) is calculated with 2 square inches of copper connected to package expose | 2 |

## CAD (KiCad official)

- Symbol: `CAT3224HV3-GT2`
- Footprint: `Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm`
- 3D model: TQFN-16-EP(3x3) (KiCad packages3D, STEP)
- 3D model files: `cat3224hv3-gt2-etched.step` / `cat3224hv3-gt2-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `cat3224hv3-gt2.step` / `cat3224hv3-gt2.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/cat3224hv3-gt2-d.pdf) (14 pp, sha256 `cc1c8fb045a0891c`, retrieved 2026-10-23, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/cat3224hv3-gt2-datasheet.pdf)