Description

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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: Can You Hear Me Now? Extend the Life of Your Hearable Device ›

Design Solution: Hearables Get Longer Life with SIMO ›

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

Applications/Uses

• Bluetooth Headphones/Hearables
• Fitness, Health, and Activity Monitors
• Internet of Things (IoT)
• Portable Devices