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MAX77650/MAX77651
Ultra-Low Power PMIC with 3-Output SIMO
and Power Path Charger for Small Li+
General Description
Benefits and Features
● Highly Integrated
The MAX77650/MAX77651 provide highly-integrated bat-
tery charging and power supply solutions for low-power
wearable applications where size and efficiency are
critical. Both devices feature a 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. A highly configu-
rable linear charger supports a wide range of Li+ battery
capacities and includes battery temperature monitoring
for additional safety (JEITA).
• Smart Power Selector™ Li+/Li-Poly Charger
• 3 Output, Single-Inductor Multiple-Output (SIMO)
Buck-Boost Regulator
• 150mA LDO
• 3-Channel Current Sink Driver
• Analog MUX Output for Power Monitoring
● Low Power
• 0.3μA Shutdown Current
• 5.6μA Operating Current (3 SIMO Channels +
LDO)
The devices include other features such as current sinks
for driving LED indicators and an analog multiplexer that
switches several internal voltage and current signals to an
external node for monitoring with an external ADC. A bidi-
● Charger Optimized for Small Battery Size
• Programmable Fast-Charge Current from 7.5mA to
300mA
• Programmable Battery Regulation Voltage from
3.6V to 4.6V
2
rectional I C interface allows for configuring and check-
ing the status of the devices. An internal on/off controller
provides a controlled startup sequence for the regulators
and provides supervisory functionality when the devices
are on. Numerous factory programmable options allow
the device to be tailored for many applications, enabling
faster time to market.
• Programmable Termination Current from 0.375mA
to 45mA
• JEITA Battery Temperature Monitors Adjust Charge
Current and Battery Regulation Voltage for Safe
Charging
● Flexible and Configurable
2
• I C Compatible Interface and GPIO
Simplified Application Circuit
• Factory OTP Options Available
IN_SBB
SYS
V
BUS
● Small Size
CHGIN
BATT
V
SYS
• 2.75mm x 2.15mm x 0.7mm WLP Package
• 30-Bump, 0.4mm-Pitch WLP, 6x5 Array
• Small Total Solution Size (19.2mm )
+
2
IN_LDO
SBB0
GND
2.05V
1.2V
3.3V
Applications
● Bluetooth Headphones/Hearables
● Fitness, Health, and Activity Monitors
● Portable Devices
TBIAS
THM
SBB1
SBB2
SYSTEM
RESOURCES
PGND
GPIO
1.5µH
● Internet of Things (IoT)
GPIO
1.85V
LXA
LXB
BST
VIO
LDO
Ordering Information appears at end of data sheet.
MAX77650
SYS
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
LED0
LED1
LED2
VIO/Power
*
*
*
*
SDA
SCL
nRST
SDA
SCL
nRST
nIRQ
PWR_HLD
AMUX
PROCESSOR
ADC INPUT
nIRQ
PWR_HLD
AMUX
nEN
*PULLUP RESISTORS NOT DRAWN
19-8550; Rev 7; 9/18