DESCRIPTION
The LTC®3675 is a digitally programmable high efficiency multioutput power supply plus dual string LED driver IC optimized for high power single cell Li-Ion/Polymer applications. The DC/DCs consist of four synchronous buck converters (1A/1A/500mA/500mA), one synchronous boost DC/DC (1A), and one buck-boost DC/DC (1A) all powered from a 2.7V to 5.5V input. The 40V LED driver can regulate up to 25mA of current through two LED strings with up to 10 LEDs each. The LED driver may also be configured as a general purpose high voltage boost converter.

FEATURES
Four Monolithic Synchronous Buck DC/DCs (1A/1A/500mA/500mA)
Buck DC/DCs Can Be Paralleled to Deliver Up to 2× Current with a Single Inductor
Independent 1A Boost and 1A Buck-Boost DC/DCs
Dual String I2C Controlled 40V LED Driver
I2C Programmable Output Voltage, Operating Mode, and Switch Node Slew Rate for All DC/DCs
I2C Read Back of DC/DC, LED Driver, Fault Status
I2C Programmable VIN and Die Temperature Warnings
Maskable Interrupts to Report DC/DC, VIN and Die Temperature Faults
Pushbutton ON/OFF/RESET
Always-On 25mA LDO
Low Quiescent Current: 16μA (All DC/DCs Off)
4mm × 7mm × 0.75mm 44-Lead QFN Package

PPLICATIONS
High Power (5W to 10W) Single Cell Li-Ion/Polymer Applications
Portable Industrial Applications, Handy Terminals, Portable Instruments
Multioutput Low Voltage Power Supplies