LTC3215EDD discription
[http://www.chinaicmart.com/series-LTC/LTC3215EDD.html]
The LTC=AE3215 is a low noise, high current charge pump DC/DC converter
designed to power high current LEDs.
The part includes an accurate programmable current source capable of
driving loads up to 700mA from a 2.9V to 4.4V input. Low external
parts count (two flying capacitors,one programming resistor and two
bypass capacitors) makes the LTC3215 ideally suited for small,
batterypowered
applications.
Built-in soft-start circuitry prevents excessive inrush current during
start-up. High switching frequency enables the use of small external
capacitors. LED current is programmed with an external resistor. The
LED is disconnected
from VIN during shutdown.
An ultralow dropout current source maintains accurate LED current at
very low ILED voltages. Automatic mode switching optimizes efficiency
by monitoring the voltage across the LED current source and switching
modes only when ILED dropout is detected. The LTC3215 is available in
a low profile 3mm =D7 3mm 10-Lead DFN package.
