General Description
The MAX77646/MAX77647 provides power supply solutions
for low-power applications where size and efficiency
are critical. The IC features a Single Inductor Multiple Output
(SIMO) buck-boost regulator that provides three independently
programmable power rails from a single inductor
to minimize total solution size. A 150mA LDO provides
ripple rejection for audio and other noise-sensitive applications.
The LDO can also be configured as a load switch
to manage power consumption by disconnecting external
blocks when not required.
The MAX77646/MAX77647 operates with battery voltages
from 1.8V with coin-cell, dual silver oxide, dual alkaline,
and LiSOCL2 primary batteries.
The MAX77646 (RSEL variant) SIMO and LDO output voltages
are individually programmable through resistors. A
peak current limit input is used to set both the inductor's
peak current limits of the device with a single resistor. Individual
enable pins combined with the flexible resistor programmability
allows the device to be tailored for many applications.
The MAX77647 (I2C variant) SIMO and LDO output voltages
are individually programmable through I2C and in
addition, includes two GPIOs with alternate modes for
scalability. A bidirectional I2C serial interface allows for
configuring and checking the status of the devices. An internal
on/off controller provides a controlled startup sequence
for the regulators and provides supervisory functionality
while they are on. Numerous factory programmable
options allow the device to be tailored for many applications,
enabling faster time to market.

Benefits and Features
● 1.8V to 3.3V Input Range
● Highly Integrated
• 3x Output, Single Inductor Multiple Output (SIMO)
Buck-Boost Regulators
• Supports Wide Output Voltage Range from 0.5V
to 5.1V for all SIMO Channels
• 1x 150mA LDO
• 100mA in LSW Mode
• 2x GPIOs (MAX77647)
• Watchdog Timer (MAX77647)
● Ultra Low-Power SIMO
• 1.3μA Operating Current (3x SIMO Channels)
• 0.1μA Shutdown Current
• 85% Efficiency in Buck-Only Mode (VIN = 2.4V,
VOUT = 0.8V,10mA, IPK = 0.5A)
• 86% Efficiency in Buck-Boost Mode (VIN = 2.4V,
VOUT = 1.8V,10mA, IPK = 0.5A)
• Less Than 20mVpp Output Ripple at VOUT = 1.8V
• Automatic Low-Power Mode to Normal-Power
Mode Transition
● Flexible and Configurable
• Ultra-Configurable Resistor Programmable Output
Voltages (MAX77646)
• I2C-Programmable Output Voltages (MAX77647)
● Small Size
• 5mm2 Wafer-Level Package (WLP)
• 20-Bump, 0.5mm Pitch, 5 x 4 Array

Applications
● GNSS Module
● IoT Enabled Wireless Sensor Nodes
● Home Safety and Security Monitors
● Factory Safety and Security Monitors
● Fitness, Health, and Activity Trackers