Overview
The CAT3626HV4-GT2, produced by onsemi, is a high-efficiency 6-channel LED driver with an I2C interface. This device is designed to drive six LED channels with programmable dimming current, making it ideal for applications requiring precise and uniform brightness control. The CAT3626 operates as a 1x/1.5x fractional charge pump, supporting input voltages from 3 V to 5.5 V with an efficiency of up to 91%. It is particularly suited for Li-Ion battery-powered devices due to its high efficiency and low noise characteristics.
Key Specifications
| Parameter | Range/Value | Units |
|---|---|---|
| VIN, LEDxx voltage | 6 | V |
| VOUT, C1±, C2± voltage | 7 | V |
| EN, SDA, SCL voltage | VIN + 0.7 | V |
| Storage Temperature Range | −65 to +160 | °C |
| Junction Temperature Range | −40 to +150 | °C |
| Lead Temperature | 300 | °C |
| Recommended Operating Input Voltage | 3 to 5.5 | V |
| Ambient Temperature Range | −40 to +85 | °C |
| LED forward voltage | Up to 4.2 | V |
| ILED per LED pin | 0 to 32 | mA |
| Switching Frequency | 1 MHz | |
| Efficiency | Up to 91% |
Key Features
- Drives 6 LED channels with independent current control on 3 pairs of LEDs
- I2C serial interface for programming
- Adjustable current up to 32 mA in 0.5 mA steps
- High efficiency 1x/1.5x fractional charge pump
- Low noise and input ripple with fixed 1 MHz switching frequency
- Zero current shutdown mode
- Soft start and current limiting
- Short circuit protection and thermal shutdown protection
- Pb-free, halogen-free/BFR-free, and RoHS compliant
Applications
- RGB LEDs
- LCD and keypad backlighting
- Cellular phones and PDAs
- Digital cameras
Q & A
- What is the input voltage range for the CAT3626?
The input voltage range for the CAT3626 is from 3 V to 5.5 V.
- How many LED channels does the CAT3626 support?
The CAT3626 supports 6 LED channels, configured into three independent pairs.
- What is the maximum current per LED channel?
The maximum current per LED channel is 32 mA, adjustable in 0.5 mA steps.
- What is the switching frequency of the CAT3626?
The switching frequency of the CAT3626 is fixed at 1 MHz.
- Does the CAT3626 have thermal protection?
Yes, the CAT3626 has thermal shutdown protection with a threshold of 165°C and a hysteresis of 20°C.
- How does the CAT3626 handle under-voltage conditions?
The CAT3626 has an under-voltage lockout (UVLO) threshold of 2 V, at which all LED channels are automatically disabled.
- What interface does the CAT3626 use for programming?
The CAT3626 uses an I2C serial interface for programming.
- Is the CAT3626 RoHS compliant?
Yes, the CAT3626 is Pb-free, halogen-free/BFR-free, and RoHS compliant.
- What is the package type of the CAT3626HV4-GT2?
The CAT3626HV4-GT2 is available in a 16-pad TQFN package.
- How does the CAT3626 handle shutdown mode?
The CAT3626 enters zero current shutdown mode when the enable input (EN) is held low.
