Wide Output-Voltage Range, Dual-

Polarity PMIC

MAX77720

www.analog.com

Analog Devices | 3

Inverting Buck-Boost Functional Modes........................................................................................................................30

Skip Mode..................................................................................................................................................................30

PWM Mode ................................................................................................................................................................30

Programming the Inverting Buck-Boost Output Voltage................................................................................................30

Detailed Description—Boost Converter.........................................................................................................................31

Boost-Converter Functional Modes...............................................................................................................................31

Skip Mode..................................................................................................................................................................31

PWM Mode ................................................................................................................................................................31

Configuring the Boost Output Voltage...........................................................................................................................31

Detailed Description—Two-Wire Communication.............................................................................................................32

General Description.......................................................................................................................................................32

System Configuration ....................................................................................................................................................32

Bit Transfer....................................................................................................................................................................33

START and STOP Conditions.......................................................................................................................................33

Acknowledge Bit............................................................................................................................................................34

Data Order.....................................................................................................................................................................34

Target Address..............................................................................................................................................................34

Clock Stretching ............................................................................................................................................................35

General Call Address ....................................................................................................................................................35

Communication Speed ..................................................................................................................................................35

Communication Protocols .............................................................................................................................................35

Writing to a Single Register .......................................................................................................................................35

Writing to Sequential Registers .................................................................................................................................36

Reading from a Single Register.................................................................................................................................38

Reading from Sequential Registers ...........................................................................................................................38

Applications Information....................................................................................................................................................39

Inverting Buck-Boost and Boost Enable Options ..........................................................................................................39

Input-Capacitor Selection ..........................................................................................................................................39

Inverting Buck-Boost Inductor Selection....................................................................................................................39

Inverting Buck-Boost Diode Selection .......................................................................................................................40

Inverting Buck-Boost Output Capacitor Selection......................................................................................................40

Boost-Inductor Selection............................................................................................................................................40

Boost Output-Capacitor Selection .................................................................................................................................41

General PCB Layout Guidelines................................................................................................................................41

Example PCB Layout ....................................................................................................................................................42

Typical Application Circuits ...............................................................................................................................................43

Register Map.....................................................................................................................................................................44

Ordering Information .........................................................................................................................................................51