LTC3221EDC-3.3#TRPBF - Charge Pump LED Driver

The LTC3221EDC-3.3#TRPBF is a high-efficiency, low-noise charge pump LED driver produced by Linear Technology, designed to provide a constant current source for driving LEDs. This compact and versatile component is ideal for portable battery-powered applications where space is at a premium and efficient power use is essential.

This LED driver operates over a wide input voltage range of 2.7V to 4.5V, making it suitable for a variety of single-cell Li-Ion/Polymer or multi-cell alkaline/NiMH applications. The device can drive up to eight LEDs in series, with a typical LED current of 20mA, which is set by an internal current source. This ensures consistent brightness and performance across the LEDs without the need for external resistors.

One of the standout features of the LTC3221EDC-3.3#TRPBF is its 1x/1.5x/2x fractional charge pump, which allows it to maintain a high efficiency over the full range of input voltages. This is particularly important for maximizing battery life in portable devices. The charge pump operates in low noise constant frequency mode, which minimizes both input and output ripple and noise, ensuring a stable power supply for sensitive applications.

The device also includes built-in soft-start to limit inrush current during start-up, and a thermal shutdown feature to protect against overheating. Additionally, it offers a shutdown mode that reduces the quiescent current to less than 1µA, further conserving battery life when the LEDs are not in use.

Designed with practicality in mind, the LTC3221EDC-3.3#TRPBF comes in a tiny, low-profile (0.75mm) 6-lead DFN package. This makes it an excellent choice for space-constrained applications such as handheld medical devices, smartphones, digital cameras, and other portable consumer electronics.

Overall, the LTC3221EDC-3.3#TRPBF from Linear Technology is a reliable and efficient solution for LED lighting applications, offering consistent performance, a compact footprint, and low power consumption that extends the life of battery-operated devices.