Compact PMIC extends lithium-ion battery life

19th October 2017
Mick Elliott

The MAX77734 power management IC (PMIC) from Maxim Integrated is now being shipped by Mouser Electronics. This tiny, ultra-low-power PMIC helps designers of wearable and hearable products extend the lithium-ion battery life of designs. The PMIC offers a flexible and configurable power management solution in a compact chip size of 2.23 × 1.97mm.

It integrates a linear-mode lithium-ion battery charger, low-dropout (LDO) linear regulator, analogue multiplexer, and dual-channel current sink driver to reduce external component count when designing small battery-operated products.

The charger is designed for small-battery systems that require accurate termination as low as 0.375mA.

The charger's programmable battery regulation voltage range (3.6V–4.6V) supports a wide variety of cell chemistries.

The device can instantly regulate the system voltage when an input source is connected even if the battery is depleted.

The 150 mA LDO regulator's output is programmable between 0.8V and 3.975V with I2C, and the analog multiplexer enables an external analog-to-digital converter (ADC) to perform conversions on battery voltage and current signals for power monitoring.

The current sinks are capable of sinking 12.8mA each and can be programmed for LEDs to blink in custom patterns.

Standby current is 1.5µA and quiescent current is 4.5μA when the LDO regulator is enabled.

Programmable options makes the device ideal for many battery-powered devices, such as Bluetooth-enabled headsets, fitness monitors, wearable cameras, and low-power Internet of Things (IoT) devices.

The MAX77734 evaluation kit allows engineers to test linear charger, regulator, multiplexer, and interface characteristics through a Windows-based GUI.

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