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PMU enables quiescent current as low as 100nA

24 Jul 2013

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Texas Instruments recently debuted a multi-mode power management unit (PMU) that enables a 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 TPS65290 PMU manages all power requirements in the system, including load conditions from 100nA to 500mA.

The TPS65290 PMU incorporates 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. In addition, the TPS65290 operates seamlessly with TI's ultra-low power MSP430 MCUs, such as the MSP430F5328.

The TPS65290 boasts an extended battery life enabling designers in the development of systems that will last beyond 10 years on a single battery. By taking advantage of the new PMU's low-power, 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 a 30mA, 300nA IDDQ buck converter.

TI's latest PMU also minimises board footprint, number of components and cost, 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 20mm2 power management chip.

The device also boasts a configurable for multiple applications: Extensive EEPROM configurations and programmable output voltages allow designers flexibility to optimise their systems' output voltage.

The TPS65290 is available today in a 24-pin, 4x5mm, VQFN package.

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