TM1929: 18-Channel Constant Current LED Driver with 128-Step Linear Current Adjustment
The TM1929 is a high-precision constant current LED driver IC designed to control up to 18 independent low-impedance LED channels. Each channel provides a constant current output ranging from 3mA to 40mA. The IC features 128 levels of linear current adjustment that can be configured via an I2C bus interface, enabling precise brightness control and dynamic lighting effects. Additionally, every three LED channels share an enable switch, allowing for customizable brightness and color variations in RGB lighting applications. Its robust design ensures consistent current output, making it ideal for decorative and functional lighting solutions.
Key Features
- 18 Independent Constant Current Channels
- Delivers stable output current regardless of load voltage variations.
- High Precision Current Control
- Channel-to-channel variation: <±1.5% (typical).
- Chip-to-chip variation: <±3% (typical).
- Adjustable Output Current
- Output current can be tuned by varying the resistance of the external resistor on the REXT pin.
- 128-Step Linear Current Adjustment
- Current range adjustable from 0% to 190% of the baseline.
- Each channel supports fine-grained adjustments for enhanced brightness control.
- RGB Lighting Control
- Groups of three channels share an enable switch for seamless brightness and color adjustments.
- I2C Interface
- Compatible with up to 4 device addresses, facilitating flexible multi-chip configurations.
- Soft Shutdown Functionality
- Smoothly transitions LED states to avoid abrupt changes.
- Wide Operating Voltage Range
- Compatible with 3.3V and 5V systems.
- Compact Packaging
- Available in QSOP24 and QFN24 packages for space-saving designs.
Applications
The TM1929 is optimized for use in decorative and ambient lighting solutions, including:
- Breathing Lights
- Creates dynamic, pulsing light effects for decorative or signaling purposes.
- RGB Lighting Systems
- Enables precise control over brightness and color in RGB LEDs for creative and functional lighting designs.
Specifications
| Parameter | Value |
|---|---|
| Channels | 18 |
| Output Current Range | 3mA–40mA |
| Linear Adjustment Steps | 128 (0%–190%) |
| Current Variation (Channel-to-Channel) | <±1.5% (typical) |
| Current Variation (Chip-to-Chip) | <±3% (typical) |
| Interface | I2C (4 device addresses) |
| Operating Voltage | 3.3V / 5V |
| Packaging | QSOP24, QFN24 |
Why Choose TM1929?
- Precise Current Regulation: Ensures uniform brightness across all LED channels and chips.
- Versatile Adjustments: Enables fine control over LED brightness and color for dynamic lighting effects.
- Easy Integration: Compact design with I2C compatibility for seamless integration into complex lighting systems.
- Reliable Performance: Maintains stable current output across varying load conditions.
The TM1929 is an excellent choice for applications requiring high precision, flexibility, and reliability in LED control, particularly in modern decorative lighting scenarios.
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