Lowest Quiescent Current, Ultra-Small LDO Helps Double Battery LifeSeptember 18, 2019 by Paul Shepard
Texas Instruments (TI) has introduced an ultra-low-power low-dropout (LDO) linear voltage regulator with the industry's lowest quiescent current (IQ) of sub-25nA - one-tenth that of competing ultra-small devices. The new regulator features low IQ control at light loads even in dropout conditions, allowing engineers to at least double the battery life of their applications.
In addition, it provides best-in-class transient response for faster wake-up, improving application response times and dynamic performance. The small solution footprint helps engineers design smaller, lighter, more efficient products quickly by reducing power-supply solution size, and its common industry packages allow for pin-to-pin drop-in replacement in existing designs.
The TPS7A02 helps engineers solve critical design challenges in many power-sensitive, high-precision and low-power applications such as in the grid infrastructure, building automation, medical equipment and wearables markets.
The device joins TI's portfolio of low-IQ LDO linear regulators that enable designers to prolong system life. By implementing the TPS7A02 with other ultra-low IQ devices - such as TI's family of ultra-low-power MSP430™ microcontrollers (MCUs), the SimpleLink™ CC2642R MCU, the TLV8802 nanopower operational amplifier or the TMP1075 low-power temperature sensor - engineers can further optimize battery life and performance in their systems.
Key features and benefits of the TPS7A02:
- Extended application run times, longer system lifetime: The TPS7A02's ultra-low IQ control at light loads allows engineers to at least double the battery life for applications using a standard battery chemistry, such as lithium-ion. For example, using the TPS7A02 in wireless video doorbell and security camera designs, engineers can achieve 24 months or more of battery life (up to four times the industry standard). In addition, the TPS7A02's ultra-low shutdown IQ of 3 nA can extend battery shelf life by as much as five times in portable medical and wearable applications compared to competing devices.
- Faster wake-up, better dynamic performance: The TPS7A02 can settle in less than 5 us for 1-to-50-mA load transients - half the time of competing devices - enabling engineers to design applications with shorter response times and better dynamic performance. With the ability to quickly respond to rapidly changing loads while providing minimal variation in output voltage, the TPS7A02 can benefit high-precision, low-power applications such as wireless Internet of Things (IoT) and portable medical devices, which require clean power to accurately acquire signals from around the body.
- Smaller solution footprint, faster time to market: The TPS7A02 automatically transitions from an IQ-saving, low-load state to a high-load, fast-transient state without the need for any external circuitry or components. As a result, engineers can use the TPS7A02 to shrink the solution size by 70%, adding more functionality to their designs in space-constrained applications or lowering system cost by using smaller boards.
Package, availability and pricing
Pre-production samples of the TPS7A02 are now available through the TI store in a 4-pin small outline no-lead (X2SON) package measuring 1mm by 1mm. A 5-pin small outline transistor (SOT-23) package measuring 2.9mm by 1.6mm will become available later this year.
In addition, a 4-pin die-size ball grid array (DSBGA) package measuring 0.65mm by 0.65mm will become available in early 2020. Pricing starts at US$0.49 in 1,000-unit quantities. The universal LDO linear voltage regulator evaluation module, MULTIPKGLDOEVM-823, is available for US$20.