TM1931: 18-Channel Constant Current LED Driver with 256-Step Linear PWM Dimming
The TM1931 is a high-performance constant current LED driver IC with 256-step linear current adjustment. It features 18 independent LED driving channels, each with its own PWM control for precise brightness modulation. The maximum constant current output per channel is 38mA, adjustable through an external resistor. Brightness control is achieved via an I2C interface, offering 256 levels of PWM duty cycle adjustment for each channel. The IC supports a low-power mode through the SDB pin or soft shutdown, making it highly efficient for energy-sensitive applications. Its reliable performance and versatile features make it ideal for mobile devices, appliances, and decorative lighting.
Key Features
- Wide Operating Voltage
- Supports supply voltages from 2.7V to 5.5V.
- Precise Brightness Control
- 256-level PWM modulation for fine-grained brightness adjustments.
- Each channel operates independently for flexible control.
- Adjustable Output Current
- Output current per channel is configurable via an external resistor, up to a maximum of 38mA.
- I2C Interface
- Integrated I2C communication with automatic address increment.
- Slave address: 10101000.
- Built-in Reset Registers
- Ensures consistent operation and easy initialization.
- Low Power Consumption
- Enter low-power mode by pulling the SDB pin low or via soft shutdown.
- Reliable in Extreme Environments
- Operating temperature range: -40°C to +85°C.
- Compact Packaging
- Available in QFN-24 (4mm x 4mm) and SOP-24 packages for space-constrained designs.
Applications
The TM1931 is well-suited for applications requiring precise and flexible LED control, including:
- Mobile Devices and Handheld Equipment
- LED displays and backlighting for phones and portable devices.
- Home Appliances
- Decorative and functional LED lighting in smart home products.
- Breathing Lights
- Creates soft, dynamic lighting effects for ambient and decorative purposes.
Specifications
| Parameter | Value |
|---|---|
| Channels | 18 |
| Maximum Current Per Channel | 38mA |
| PWM Adjustment Levels | 256 |
| Supply Voltage | 2.7V–5.5V |
| Interface | I2C |
| Operating Temperature | -40°C to +85°C |
| Packaging | QFN-24 (4mm x 4mm), SOP-24 |
Why Choose TM1931?
- Independent Control: Each LED channel operates independently, allowing for intricate lighting designs.
- Flexible Brightness Adjustment: 256 levels of PWM dimming enable smooth transitions and dynamic lighting effects.
- Compact and Reliable: Small footprint with robust performance across a wide temperature range.
The TM1931 combines precision, efficiency, and versatility, making it an excellent choice for advanced LED applications where performance and reliability are paramount.
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