VS4101
Description
The VS4101 is a step-up DC/DC converter designed for driving up to 8 white LEDs in series from a single cell Lithium Ion battery with constant current. Because it directly regulates output current, the VS4101 is ideal for driving light emitting diodes (LEDs) whose light intensity is proportional to the current passing through them, not the voltage across their terminals. A single external resistor sets LED current between 5m A and 20m A, which can then be easily adjusted using either a DC voltage or a pulse width modulated (PWM) signal. Its low 104m V feedback voltage reduces power loss and improves efficiency. The OV pin monitors the output voltage and turns off the converter if an over-voltage condition is present due to an open circuit condition. The PT4101 is available in SOT23-6 and QFN8 packages.
Features
- Driver Up to 5 series White LEDs from 2.5V
- Driver Up to 8 series White LEDs from 3.6V
- Up to 87% Efficiency
- Over 1.2MHz Fixed Switching Frequency
- Low 104m V...
