概觀
IS31BL3508B is a boost converter featuring an
integrated MOSFET switch designed for driving series
strings of LED or other device. Input operating voltage
range is 2.7V~5.5V. The device regulates the LED load
current is set using an external, low value sensing
resistor. The device adjusts the PWM duty cycle of the
switch to maintain the voltage at the FB pin at a value
of 0.2V.
The IS31BL3508B operates at a constant switching
frequency of 1.0MHz to allow for small component size.
IS31BL3508B features an over voltage shutdown pin
which prevents the output voltage from exceeding 38V
(typ.) in the case of an open circuit condition.
The device is offered in a SOT-23-6 package and a
temperature rating from -40°C ~ +85°C.