The application range of power management chips is very wide, and the development of power management chips is of great significance to improve the performance of the whole machine. Today, the editor will introduce five TI power management products to further develop the market in this field.

These five power management integrated circuits from Texas Instruments efficiently extract and manage microwatt (uW) to milliwatt (mW)-level power harvested from light sources, heat sources, or mechanical energy sources. The bq25570, bq25505, TPS62740, TPS62737, and TPS62736 support the industry‘s lowest operating quiescent current, enabling battery-free operation for applications such as wireless sensor networks, surveillance systems, wearable medical devices, and mobile accessories that are difficult to power.

TI‘s latest bq25570 boost charger with integrated buck converter not only has an extremely low quiescent current consumption of only 488 nanoamps (nA), but can achieve over 90% output current below 10 microamps (uA) efficiency, so that high efficiency can be maintained even when the power supply is extremely low. The device supports not only maximum power point tracking (MPPT) to extract and manage power from photovoltaic cells and thermoelectric generators, but also any energy storage element such as rechargeable lithium-ion batteries, thin-film batteries, supercapacitors or conventional capacitors, etc. . During long-term storage, the bq25570 power supply can be disabled through the "shipmode" feature, which consumes less than 5nA.

The 2bq25505 boost charger is similar to the bq25570, but can achieve an operating quiescent current as low as 325nA. The bq25505 adopts a unique automatic power multiplexer gate driver, which can realize seamless system operation through the energy harvesting power supply and the primary battery, and can also provide a constant power supply when the energy harvester does not provide power, so as to meet the system operation needs.

In addition to the battery management circuit, TI also introduced the smallest and lowest power buck converter TPS62740 for 300mA output current design, which can support 360nA quiescent current in active operation and 70nA in standby state . The converter can achieve over 90% efficiency at currents as low as 10uA. It enables a total solution size of 31mm², supports programmable output voltage characteristics and DCS-Control™ functionality, enabling the integration of microcontrollers such as TI‘s ultra-low power MSP430FR59xx microcontrollers (MCUs), and

Powering Bluetooth® low energy solutions such as the SimpleLink™ CC2541 wireless MCU. In addition, the TPS62740‘s integrated load switch saves power for temporary use components such as LEDs or sensors.

For lower current designs, TI‘s latest TPS62737 converters for 200mA designs and TPS62736 for 50mA designs deliver ultra-low quiescent currents of 370nA during active operation, 15nA in sleep mode, and 90% efficiency can be achieved with less than 15uA output current.

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