Texas Instruments' TPS65290 is a 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 miliamps. The device operates over a wide 2.2 to 5 V input voltage range and incorporates a very-low quiescent current always-on power supply, a 500 mA buck/boost converter, a 150 mA low-dropout regulator, 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/PWM operation with forced PWM option, for maximum overall efficiency. The switches can be used to support different configurations for the various loads supported by the TPS65290. For energy-harvesting applications, a programmable input voltage monitor is integrated to allow for connection and disconnection of the different power blocks and switches without the intervention of the master processor.
- Operating input voltage range: 2.2 to 5 V
- 500 mA buck-boost converter, stand-alone operation, or serial bus controlled
- PFM/PWM operation with forced PWM option
- 150 mA LDO
- Stand-alone or serial bus (SPI or I²C) controlled
- Two power-distribution switches powered from buck-boost output
- One power-distribution switch powered from the maximum of buck-boost or battery-input
- Two power-distribution switches powered from LDO output
- One power switch powered from battery-input
- One power switch to connect BB output to LDO output and improve system efficiency