LTC2609CGN#TRPBF

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LTC2609CGN#TRPBF is a digitally controlled variable current sink, designed for applications such as LED lighting, digital environmental controls and illumination or display systems. It utilizes an internal digital-to-analog converter (DAC) to control the output current setting with a digital input through an exposed pad allowing for the use of multiple digital device interfaces.

Its main application field is the illumination or display systems, because of its current sink feature. The user can get a constant current output from the device in order to operate the LED(s).

Outdoor LED Lighting

LTC2609CGN#TRPBF lends itself to outdoor LED lighting applications, as its high current and neutral output feature helps boost accuracy and reliability even under severe environmental conditions. The very low voltage drop ensures that accurate light levels can be maintained in outdoor luminaires, even if the available system voltage is reduced by high temperatures.

Digital Environmental Control

The very low voltage drop also provides a smooth transition between ON and OFF states —often required in applications such as digital environmental control. With this, the user can quickly and easily adjust the brightness/color of environment’s lights, or reproduce a range of shades thanks to the 250kHz PWM operation.

Working Principle

The working principle behind the device is that it operates using a high side NMOS switch, which allows the load current to be regulated and controlled. When it is in the ON state, the output current flows in the load direction until the voltage between the source and the load reaches the programmed output current value.

The set output value can be changed from 0.0625 mA up to the maximum value with the gain resistor and the full range is achieved by the internal digital-to-analog converter (DAC). In order to provide a regulated and stable output current, it possesses a voltage drop of only 6.3 mV when it is operated at maximum load current.

LTC2609CGN#TRPBF is designed to be stable under most sudden conditions such as over-current and short circuit. This ensures that the load is never damaged or exposed to excessive power through any fault or sudden alterations in the operating environment.

Advantages of LTC2609CGN#TRPBF

The main advantage of using the LTC2609CGN#TRPBF is its power efficiency. It provides very high efficiency, as it is only consuming few micro-amps when not active; this means you can ensure the same level of illumination or display without wasting energy when not being used. The device also has a thermal shutdown feature, which ensures that it will never overheat preventing possible damage to the load.

In addition, this device can operate over a wide temperature range and can control currents up to 20mA. Moreover, it has very low voltage drops, low total harmonic distortion, good AC performance and low pin-to-pin voltage noise.

Conclusion

In conclusion, LTC2609CGN#TRPBF is a very efficient, reliable, and accurate digitally controlled variable current sink designed for LED lighting, digital environmental control and illuminated display applications. Due to its low voltage drops, low total harmonic distortion, good AC performance and low pin-to-pin voltage noise, it can control LED currents up to 20mA with hundredth of milli-amp accuracy.

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