The MP3388 is a step-up converter with
8-channel current sources designed for driving
the white LED arrays for large size LCD panel
backlighting applications.
The MP3388 uses current mode, fixed frequency
architecture. The switching frequency can be
selected at 1.25MHz or 625kHz. It generates an
output voltage up to 50V from a 4.5V to 25V input
supply. The MP3388 independently regulates the
current in each LED string to the user programmed
value set by an external current setting resistor.
The MP3388 applies 8 internal current sources in
each LED string terminal to achieve a current
balance of 3% regulation accuracy between
strings. Its low 600mV regulation voltage on LED
current sources reduces power loss and improves
efficiency.
The MP3388 features external PWM dimming or
DC input PWM dimming, which allows the flexible
control of the backlighting luminance. The dimming
PWM signal can be generated internally, and the
dimming frequency is programmed by an external
setting capacitor