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MAX77650/MAX77651
EVALUATION KIT AVAILABLE
Ultra-Low Power PMIC with 3-Output SIMO and Power Path Charger for Small Li+
General Description
The MAX77650/MAX77651 provide highly-integrated battery 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 configurable linear charger supports a wide range of Li+ battery capacities and includes battery temperature monitoring for additional safety (JEITA).
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 bidirectional I2C 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 when the devices are on. Numerous factory programmable options allow the device to be tailored for many applications, enabling faster time to market.
Simplified Application Circuit
VBUS +
CHGIN BATT
IN_SBB SYS
VSYS
GND
TBIAS THM
IN_LDO SBB0
SBB1
SBB2
1.5µH
LXA LXB BST
PGND
GPIO VIO LDO
SYS MAX77650
LED0
LED1 LED2 nEN
SDA SCL nRST nIRQ PWR_HLD AMUX
*PULLUP RESISTORS NOT DRAWN
2.05V 1.2V 3.3V
SYSTEM RESOURCES
GPIO 1.85V
SDA SCL nRST nIRQ PWR_HLD AMUX
VIO/Power
* * PROCESSOR * *
ADC INPUT
Benefits and Features
●● Highly Integrated • 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)
●● 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 • 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 • I2C Compatible Interface and GPIO • Factory OTP Options Available
●● Small Size • 2.75mm x 2.15mm x 0.7mm WLP Package • 30-Bump, 0.4mm-Pitch WLP, 6x5 Array • Small Total Solution Size (19.2mm2)
Applications
●● Bluetooth Headphones/Hearables ●● Fitness, Health, and Activity Monitors ●● Portable Devices ●● Internet of Things (IoT)
Ordering Information appears at end of data sheet.
Smart Power Selector is a trademark of Maxim Integrated Products, Inc.
19-8550; Rev 7; 9/18
MAX77650/MAX77651
Ultra-Low Power PMIC with 3-Output SIMO and Power Path Charger for Small Li+
TABLE OF CONTENTS
General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Benefits and Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Simplified System Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical Characteristics—Top Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Electrical Characteristics—Global Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Electrical Characteristics—Smart Power Selector Charger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Electrical Characteristics—Adjustable Thermistor Temperature Monitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Electrical Characteristics—Analog Multiplexer and Power Monitor AFEs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Electrical Characteristics—SIMO Buck-Boost . . . . . . . . . . . . . . . . . . . . . . . . .