The PST9503 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
PST9503 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 5mA and 20mA, which can then
be easily adjusted using either a DC voltage or a pulse width
modulated (PWM) signal. Its low 104mV 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
PST9503 is available in SOT23-6 and QFN8 packages.
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