The TPS65290 device is a power-managemant integrated circuit (PMIC) designed to operate
in applications dependent on efficient power management over a wide range of system load conditions
ranging from fractions of a microamp to a few hundred milliamps. The device operates over a wide
2.2-V to 5-V input-voltage range and incorporates a very low-quiescent-current always-on power
supply, a 500-mA buck-and-boost converter, a 150-mA low-dropout regulator (LDO) and eight
power-distribution switches. The always-on supply features three different factory selectable
options: 30-mA buck converter with 300-nA quiescent current, 10-mA LDO
with 400-nA quiescent current, and 10-mA zero IDDQ drop with 100-nA quiescent current.
The buck-boost converter employs PFM or PWM operation with forced PWM option, for maximum overall
efficiency. A designer can use the switches to support different configurations for the various
loads supported by the TPS65290 device. For energy-harvesting applications, the device integrates a
programmable input-voltage monitor to allow for connection and disconnection of the different power
blocks and switches without the intervention of the master processor.
To maximize control flexibility, the TPS65290 device includes a factory-selectable choice
between SPI and I2C interfaces. To minimize PC board footprint and
reduce bill of materials (BOM) components and cost, the PMIC internally includes resistive dividers
(boost-buck, LDO, VIN monitor), I2C pullup
resistors, SPI pulldown resistors, boost-buck compensation, and an interrupt pullup resistor.
Completion of a comprehensive multi-rail solution for efficient flow meter, handheld industrial,
fitness, and other long-term data-acquisition systems requires only low-cost ceramic capacitors and
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