LTC3675 Datasheet, PDF (2/36 Pages) Linear Technology – 7-Channel Confi gurable High Power PMIC

LTC3675
TABLE OF CONTENTS
Features ............................................................................................................................ 1
Applications ....................................................................................................................... 1
Typical Application ............................................................................................................... 1
Description......................................................................................................................... 1
Absolute Maximum Ratings..................................................................................................... 3
Order Information................................................................................................................. 3
Pin Configuration ................................................................................................................. 3
Electrical Characteristics ........................................................................................................ 4
Typical Performance Characteristics .......................................................................................... 8
Pin Functions .....................................................................................................................14
Block Diagram....................................................................................................................16
Operation.......................................................................................................................... 17
Buck Switching Regulator .................................................................................................................................... 17
Buck Regulators with Combined Power Stages .................................................................................................... 17
Boost Switching Regulator ................................................................................................................................... 18
Buck-Boost Switching Regulator .......................................................................................................................... 18
LED Driver ............................................................................................................................................................ 18
Pushbutton Interface and Power-Up Power-Down Sequencing ............................................................................ 19
Power-Up and Power-Down via Pushbutton ......................................................................................................... 19
Power-Up and Power-Down via Enable Pin or I²C................................................................................................. 21
LED Current Programming ................................................................................................................................... 21
I²C Interface.......................................................................................................................................................... 21
Error Condition Reporting via RSTB and IRQB Pins ............................................................................................. 24
Undervoltage and Overtemperature Functionality ................................................................................................. 25
Applications Information .......................................................................................................26
Switching Regulator Output Voltage and Feedback Network................................................................................. 26
Buck Regulators ................................................................................................................................................... 26
Combined Buck Regulators .................................................................................................................................. 26
Boost Regulator.................................................................................................................................................... 27
Buck-Boost Regulator........................................................................................................................................... 28
LED Driver ............................................................................................................................................................ 28
Operating the LED Driver As a High Voltage Boost Regulator............................................................................... 29
Input and Output Decoupling Capacitor Selection................................................................................................. 29
Choosing the C_T Capacitor ................................................................................................................................... 30
Programming the UVOT Register ......................................................................................................................... 30
Programming the RSTB and IRQB Mask Registers .............................................................................................. 30
Status Byte Read Back ......................................................................................................................................... 31
PCB Considerations .............................................................................................................................................. 31
Typical Applications .............................................................................................................32
Package Description ............................................................................................................35
Typical Application ..............................................................................................................36
Related Parts .....................................................................................................................36
3675f
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