Overview
The CAT4002A, represented by the part number CAT4002BTD-GT3, is a constant current LED driver produced by onsemi. This device is designed to drive LEDs with high accuracy and efficiency. It features two matched low dropout current sources, making it suitable for a variety of applications requiring precise LED current regulation. The CAT4002A operates within a voltage range of 2.4 to 5.5 V and can handle ambient temperatures from -40 to +85 °C. It is available in a compact 6-lead SC-70 package, making it ideal for space-constrained designs.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| VIN | 2.4 | - | 5.5 | V |
| LED Current per LED Pin | 0 | - | 40 | mA |
| Quiescent Current (No Load, RSET Float) | - | 0.5 | - | mA |
| Shutdown Current | - | - | 1 | μA |
| LED Current Accuracy | - | - | ±1% | - |
| Dropout Voltage (90% of nominal LED current) | - | 50 | - | mV |
| Thermal Shutdown | - | - | 150 | °C |
| Undervoltage Lockout (UVLO) Threshold | - | 2.0 | - | V |
Key Features
- 2 matched low dropout current sources for driving LEDs
- 32 linear dimming levels via the EN/DIM pin
- Low dropout voltage of 50 mV at 20 mA
- No switching noise
- Shutdown current less than 1 μA
- LED current set by an external resistor (RSET)
- Dimming via a 1-wire EZDim interface
- Thermal shutdown protection
- Available in 6-lead SC-70 and 8-pad UDFN 2 mm x 2 mm 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 operating voltage range of the CAT4002A?
The CAT4002A operates within a voltage range of 2.4 to 5.5 V.
- How many dimming levels does the CAT4002A support?
The CAT4002A supports 32 linear dimming levels.
- What is the typical dropout voltage of the CAT4002A at 20 mA?
The typical dropout voltage is 50 mV at 20 mA.
- How is the LED current set in the CAT4002A?
The LED current is set by an external resistor (RSET) connected between the RSET pin and ground.
- What is the shutdown current of the CAT4002A?
The shutdown current is less than 1 μA.
- What are the package options for the CAT4002A?
The CAT4002A is available in 6-lead SC-70 and 8-pad UDFN 2 mm x 2 mm packages.
- Is the CAT4002A RoHS compliant?
- What is the thermal shutdown temperature of the CAT4002A?
The thermal shutdown temperature is 150 °C.
- How does the EN/DIM pin function in the CAT4002A?
The EN/DIM pin enables and disables the device and controls the LED current dimming with 32 different levels.
- What is the undervoltage lockout (UVLO) threshold of the CAT4002A?
The UVLO threshold is 2.0 V.
