Overview
The CAT4104V-GT3 is a quad-channel constant current LED driver produced by onsemi. This device is designed to drive high-brightness LED strings with precision and reliability. It features four matched low dropout current sinks, each capable of delivering up to 175 mA of current. The LED channel current is set by an external resistor connected to the RSET pin, allowing for flexible current adjustment. The device supports high voltage operation on the LED pins up to 25 V, making it suitable for applications involving long strings of LEDs.
Key Specifications
| Parameter | Rating/Value | Unit |
|---|---|---|
| Supply Voltage | 3.0 to 5.5 | V |
| Output Current per Channel | Up to 175 | mA |
| Output Voltage | Up to 25 | V |
| Package Style | SOIC-8 | |
| Mounting Method | Surface Mount | |
| Junction Temperature Range | -40 to +150 | °C |
| Thermal Shutdown | 150 °C | |
| Undervoltage Lockout (UVLO) Threshold | 2.0 | V |
Key Features
- Four matched LED current sinks up to 175 mA per channel
- Up to 25 V operation on LED pins
- Low dropout current source (0.4 V at 175 mA)
- LED current set by external resistor
- High frequency PWM dimming via EN/PWM pin
- Zero current shutdown mode
- Thermal shutdown protection
- RoHS-compliant TDFN 8-Pad 2 x 3 mm and SOIC 8-Lead packages
Applications
- Automotive Lighting
- General and Architectural Lighting
- LCD Backlight
Q & A
- What is the maximum current each channel of the CAT4104V-GT3 can deliver?
Each channel can deliver up to 175 mA of current.
- How is the LED current set in the CAT4104V-GT3?
The LED current is set by an external resistor connected to the RSET pin.
- What is the maximum voltage the LED pins can handle?
The LED pins can handle up to 25 V.
- Does the CAT4104V-GT3 support PWM dimming?
Yes, it supports high frequency PWM dimming via the EN/PWM pin.
- What is the thermal shutdown temperature of the CAT4104V-GT3?
The device disables the LED outputs when the die temperature exceeds 150°C.
- What packages are available for the CAT4104V-GT3?
The device is available in SOIC 8-Lead and TDFN 8-Pad packages.
- Is the CAT4104V-GT3 RoHS-compliant?
Yes, the device is RoHS-compliant.
- What is the purpose of the EN/PWM pin?
The EN/PWM pin serves as both the device enable input and the PWM control input.
- How does the CAT4104V-GT3 handle undervoltage conditions?
The device has an undervoltage lockout (UVLO) circuit that disables all LED channels if the input supply falls below 2 V.
- Can the LED channels be combined to increase the total current?
Yes, the LED channels can be tied together to sink up to a total of 700 mA from the device.
