Ultra-Low Power PMIC with 3-Output SIMO and Charger Optimized for Small Li+

Highly-Integrated Battery Charging and Power Solution for Low-Power, Size-Constrained Applications


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.

Design Solution: Hearables Get Longer Life with SIMO ›

MAX77650, MAX77651: Simplified Block Diagram Highly-integrated battery charging and power solution for low power, size constrained applications | Simplified Block Diagram Enlarge+

Key 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 Standby 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 × 2.15mm × 0.7mm WLP Package
    • 30-Bump, 0.4mm-Pitch WLP, 6x5 Array
    • Small Total Solution Size (19.2mm2)


  • Bluetooth Headphones/Hearables
  • Fitness, Health, and Activity Monitors
  • Internet of Things (IoT)
  • Portable Devices
Part Number Primary Topology Monitor/Control Features DC-DC/Power Features Battery Charger Features Interface Type VIN
Oper. Freq.
Package/Pins Budgetary
min max min max See Notes
Reset Output
Serial Interface
Current Limit
Internal Switch
Soft Start
Sync. Rectifier
Battery Charger
Charge Timer
Input Current Limit
Smart Pwr. Selector
Thermal Die Regulation
Thermistor Input
USB Input
2.7 5.5 0.8 5.25 0.3 0.3 1000
$1.99 @1k
MAX77650  3.95
See All Multifunction PMICs (73)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX77650EVKIT: Evaluation Kit for the MAX77650/MAX77651
MAX77651EVKIT: Evaluation Kit for the MAX77650/MAX77651
MAX32620FTHR: Evaluation Kit for the MAX32620/MAX77650/MAX17055
MAX77650/MAX77651 EV Kit Software  
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

Related Resources

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  • Die Temperature Measurement and alert

Wearable Power Management Solution

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Ultra-Low Power Tiny PMIC with Power Path Charger for Small Li+ and 150mA LDO

  • Extends Battery Life
  • Linear Charger Optimized for Small Battery Size
  • Highly Integrated