Ultra-Low Power PMIC with 3-Output SIMO, Power Path Charger Optimized for Small Li+, 425mA Current Sink, and 8 GPIOs

The MAX77278 provides a highly-integrated battery charging and power supply solution for low-power applications where size and efficiency are critical.The device 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 50mA 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 device includes other features such as a programmable current sink that can be used to drive an IR-LED, 8 general-purpose input/output (GPIO) control pins, and an analog multiplex (AMUX) output that provides access to useful battery charging signals. A bidirectional I2C interface allows for configuring and checking the status of the device. An internal on/off controller provides a controlled startup sequence for the regulators and provides supervisory functionality when the device is on. Numerous factory programmable options allow the device to be tailored for many applications, enabling faster time to market.

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Applications

* Internet of Things (IoT) Gadgets * Remote Controls, Game Pads, Media Center Controllers * Smart Home Automation Pads, Thermostats, Battery-Powered User Interfaces * Wearables, Fitness and Health Monitors

* Highly Integrated

* Smart Power Selector™ Li+/Li-Poly Charger

* Three Output, SIMO Buck-Boost Regulator

* 50mA LDO with SIMO Fixed Headroom Control

* Programmable 250mA to 425mA Current Sink Driver

* Analog MUX Output for Power Monitoring

* Eight GPIOs (Configured for One-Button Wake-Up and Two-Button Shutdown)

* Low Power

* 0.3µA Standby Current

* 16µA Operating Current

* 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

* Eight GPIOs

* Factory OTP Options Available

* Small Size

* 3.15mm x 2.15mm x 0.7mm

* 35-Bump, 0.4mm-Pitch, 7x5 Ball Array, WLP

* Small Total Solution Size (24mm2)