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LDO family packs auto low-power mode

Posted: 06 Oct 2009     Print Version  Bookmark and Share

Keywords:linear regulator  LDO  power supply 

Texas Instruments Inc. announces a family of 200mA, low dropout regulators (LDOs) offering an auto low-power mode. This combines ultra-low quiescent current of less than 8µA and fast transient response of ±50 mV. It keeps noise low and power supply rejection ratio (PSRR) high. At 70 per cent lower quiescent current than existing solutions, the new LDOs help increase battery runtime without sacrificing performance in noise-sensitive applications, such as smart phones, MP3 players, RF modules, remote controls, Zigbee network systems and handheld consumer devices.

Typical high-performance LDOs require the load quiescent current to be 25µA or less. Auto low-power mode allows the TPS727xx to achieve less than 8µA without an additional mode pin and automatically switches to and from low power depending on load current. In addition, the use of auto low-power mode eliminates the need to modify software drivers to control the mode pin, which speeds and simplifies the design process. It also reduces cost by eliminating the need for a GPIO pin and overhead firmware.

The TPS727xx offers low-power operation with innovative auto low-power mode. Its low noise 32µVRMS and high PSRR 70dB at 1kHz help increase battery runtime without sacrificing noise. The devices also enable the use of small 1µF ceramic capacitors, allowing for a smaller overall solution. It also provides low dropout of 130mV, plus stable and accurate output voltage range of 0.9-5V, which increases system reliability. Plus, factory EEPROM programming of the output voltage provides the flexibility to quickly sample and release custom Vout versions.

The TPS727xx is available now in a 1.5mm x 1.5mm SON-6 package and a 0.8mm x 1.22mm, 0.4mm pitch, 4-ball WCSP package. It is priced at Rs.23.34 ($0.48) in quantities of 1,000.

Get related application notes and technical articles on Power Design India.

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