华润矽威led 驱动ic pt4412

general description
the pt4412 is a series of white/blue led drivers.
there is no external component needed, which helps to
lower the system cost significantly. the circuit is
optimized to provide over 90% efficiency. the pt4412
is ideal to drive white leds used for li-ion battery
powered lcd displays. the led brightness can be
adjusted in real time through a pwm signal at the en
pin. the target end applications are small color lcd
displays in mobile phones, smart phone, digital cameras,
pda etc. pt4412 is available in sot23-6 package.
features
z  no external component required
z  fixed 20ma and 15ma sinking current
z  individual current sink circuit for each output to
prevent short/open circuit on leds
z  ptc led current for luminosity compensation
z  4 channels available
z  pwm tuned led brightness through en pin
z  supply voltage range 2.7v~6.0v
z  0.1ua standby current
applications
z  small size color lcd backlights
z  mobile phone, smart phone, pda etc. backlights