Overview
The CAT4004AHU2-GT3B is a constant current LED driver produced by onsemi. This device is part of the CAT400XA series, which includes the CAT4002A and CAT4004A models. The CAT4004AHU2-GT3B specifically provides four matched low dropout current sources to drive LEDs. It features a compact 8-pad UDFN package with dimensions of 2 mm x 2 mm and a maximum height of 0.55 mm. The device is designed to handle a wide range of LED forward voltages while maintaining tight current matching across all channels.
Key Specifications
| Parameter | Rating/Value | Unit |
|---|---|---|
| VIN, LEDx, RSET | 6 | V |
| EN/DIM Voltage | 6 | V |
| Storage Temperature Range | −65 to +160 | °C |
| Junction Temperature Range | −40 to +125 | °C |
| Lead Temperature | 300 | °C |
| Quiescent Current (No load, RSET = Float) | 0.2 - 0.5 | mA |
| Shutdown Current | < 1 | μA |
| LED Current Setting (RSET = 3.0 kΩ) | 25 | mA |
| LED Current Accuracy | ±1% | |
| LED Channel Matching | ±5% | |
| RSET Pin Regulated Voltage | 0.57 - 0.63 | V |
| Dropout Voltage (90% of nominal LED current) | 50 mV at 20 mA | |
| Thermal Shutdown | 150 | °C |
| Undervoltage Lockout (UVLO) Threshold | 2.0 | V |
Key Features
- 4 LED Current Sinks with Tight Matching
- 32 Linear Dimming Levels
- Low Dropout Driver (50 mV at 20 mA)
- No Switching Noise
- Shutdown Current less than 1 μA
- LED Current set by External Resistor
- Dimming via 1-wire EZDim Interface
- Thermal Shutdown Protection
- Available in 8-pad UDFN 2 mm x 2 mm and 6-lead SC-70 packages
- Pb-Free, Halogen Free/BFR Free and RoHS Compliant
Applications
- LCD Display Backlight
- Digital Still Cameras
- Cellular Phones
- Handheld Devices
Q & A
- What is the CAT4004AHU2-GT3B used for? The CAT4004AHU2-GT3B is used as a constant current LED driver, providing four matched low dropout current sources to drive LEDs.
- What are the key package options for the CAT4004A? The CAT4004A is available in an 8-pad UDFN package (2 mm x 2 mm) and a 6-lead SC-70 package.
- How is the LED current set in the CAT4004A? The LED current is set by an external resistor connected between the RSET pin and ground.
- What is the dimming capability of the CAT4004A? The CAT4004A supports 32 linear dimming levels through the EN/DIM pin.
- What is the typical dropout voltage of the CAT4004A? The typical dropout voltage is 50 mV at 20 mA.
- What is the thermal shutdown temperature of the CAT4004A? The thermal shutdown temperature is 150°C.
- Is the CAT4004A RoHS compliant? Yes, the CAT4004A is Pb-Free, Halogen Free/BFR Free and RoHS Compliant.
- What is the operating input voltage range for the CAT4004A? The operating input voltage range is from 2.4 V to 5.5 V.
- How does the EN/DIM pin function? The EN/DIM pin enables and disables the device and controls the LED current dimming with 32 different levels.
- What happens if the input supply falls below the under-voltage threshold? If the input supply falls below 2.0 V, all LED channels are disabled, and the device enters shutdown mode.
