概觀
The IS31FL3195 is a compact and efficient 4-channel
charge pump LED driver with programmable sequence
operation for automated RGBW lighting effects. It is
capable of driving 1 to 4 LEDs with a low drop-out and
current matching so all 4 LEDs maintain consistent
brightness. Each channel can support up to 20mA of
current.
(CP) structure will
The built−in charge pump
automatically
toggle between 1x, 1.5x operation
depending on the battery’s state of charge. This
DC/DC converter operates at a high switching
frequency which enables the use of small external
capacitors and achieves 92% peak total efficiency. The
IS31FL3195 is optimized for battery applications. To
conserve battery life, the charge pump goes into high
impedance mode whenever
is
the
shutdown consuming less than 1µA.
The IS31FL3195 can operate in either “Current Level”
or “Programmable Sequence” mode. In Current Level
mode, the average output current of each output is
independently programmed and controlled in 256
PWM steps to simplify color mixing. In programmable
sequence mode, the timing characteristics for each
output can be individually adjusted to maintain a
pre-established pattern sequence without requiring
any additional MCU interaction, thus saving valuable
system resources.
The IS31FL3195 is available in a small QFN-16 (4mm
× 4mm) and WLCSP-16 (1.88mm×2.08mm, 0.45mm
ball pitch, 0.2mm ball diameter) packages. It operates
from 2.7V to 5.5V over the temperature range of -40°C
to +85°C.
With automated lighting effects and a DC/DC charge
pump, the small package IS31FL3195 is ideal for low
power battery applications.