Designing hearables, wearables and consumer IoT devices?
Leap forward with the low power, always ON, SIMO Power Management ICs
Portable devices in the consumer market, especially those in the field of Hearables, Wearables and internet of things (IoT) space, all share the same challenge: they are highly constrained on size - visualize your ears narrow canal or lifestyle solutions that need to be sleek & fashionable. All these devices need to have a long battery life.
The consumer market is on an incessant mission of increasing performance, yet solutions are expected to reduce power consumption and further extend battery life. At the heart of this are the power management integrated circuits, or PMICs, that govern power distribution from the battery to the rest of the system. PMICs are critical in solutions with ultra-low current restriction as they determine how much current is drawn from the battery at light loads or in shutdown. Therefore, when evaluating PMICs, shutdown and quiescent current should be considered along with power capability and efficiency.
In addition to having ultra-low current draw, PMICs integrate features to optimize battery charge-discharge cycles. For example, the PMIC may keep the battery topped off at its peak voltage, so maximum battery capacity is available. And, during discharge, a PMIC may enable operation down to the lowest possible state-of-charge, extending the device’s operation time.
Besides battery management, PMICs can offer other features that help reduce design time. For example, Maxim offers PMICs not only with ultra-low current draw and JEITA standard battery charging, but I2C control, GPIOs, and current sinks for LEDs. The default behavior of these parts is factory programmable, so parts can arrive at engineers’ desks already fine-tuned for their specific applications.
Ultra-Low Power PMIC, 3-Output SIMO & Charger
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.
Ultra-Low Power Tiny PMIC with Power Path Charger for Small Li+ and 150mA LDO
MAX77734 is a great example of a PMIC that handles battery charging and provides power to the system while drawing miniscule power for itself. In shutdown mode, this device draws only 500nA typically, and for long shelf life, the MAX77734 factory ship mode further reduces current draw to 200nA typically. The linear charger integrated in this device follows the JEITA standard to ensure safe charging and can charge batteries with a maximum of 300mA. To prepare the MAX77734 for future battery technology, the maximum charge voltage is 4.6V.
In addition to the battery charger, an LDO is available that can be enabled through firmware or through an on-key such as a slide switch or push-button. This part communicates to the host via I2C serial communication, an interrupt pin, and an AMUX pin. The interrupt pin ensures quick notification to the host about power-related problems, and the host can use the AMUX pin to monitor different analog signals, like a thermistor voltage or battery current. For visual indications, the MAX77734 drives two current sinks that can control LEDs.
Contest: Unleash Invisible Intelligence
The best IoT applications let us monitor things we’ve never dreamed of monitoring. We’re challenging you to come up with creative ways to infuse intelligence into a new application using the MAX32620FTHR rapid development platform.
MAX32620FTHR Evaluation Kit
The MAX32620FTHR board is a development platform designed to help engineers implement battery-optimized solutions with the MAX32620 Arm® Cortex®-M4 microcontroller w/ FPU. The board also includes MAX77650 ultra-low power PMIC & MAX17055 fuel gauge
Designing hearables? Tiny PMICS boost battery life
Hearables have been called the next big consumer thing, enhancing hearing and understanding via applications such as sound control, noise cancellation, speech amplification, and even real-time language translation.