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Power management unit maximises 'always-on' function

17 Jul 2013

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Texas Instruments recently unveiled a multi-mode power management unit (PMU). The TPS65290 enables ultra-low, total system quiescent current as low as 100nA, minimising power consumption in battery-powered, microcontroller-based water and gas meters and other industrial applications. The device manages all power requirements in the system, including load conditions from 100nA to 500mA.

The TPS65290 PMU uses three factory configurable "always-on" power supplies for microcontroller (MCU) sleep mode and an automatic function for choosing power from either the input voltage or buck-boost converter.

The TPS65290 extends battery life, allowing designers to develop systems that last beyond 10 years on a single battery using an always-on bias supply for MCU sleep mode with the following three factory-selectable options a 10mA, 100nA quiescent current (IDDQ) sleep mode, leakage current bias controller with preset voltage, a 10mA, 400nA IDDQ low-dropout regulator (LDO) and 30mA, 300nA IDDQ buck converter.

The device also minimises board footprint, number of components and cost by integrating a 500mA buck-boost converter, 150mA LDO, eight power distribution switches, input voltage recovery comparator, state machine, and factory-selectable SPI/I2C interface onto one 20-mm2 power management chip.

The TPS65290 is configurable for multiple applications and boasts extensive EEPROM configurations and programmable output voltages allow designers flexibility to optimise their systems' output voltage. In addition, the TPS65290 operates seamlessly with TI's ultra-low power MSP430 MCUs, such as the MSP430F5328.

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