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  • In applications that need to run from a small battery cell for longer periods,

  • you want to make the application average power consumption as low as possible.

  • These applications will often run in sleep mode most of the time,

  • and are only active for short periods.

  • To minimize the power consumption in sleep mode,

  • you need to selects parts with very low quiescent current,

  • and this is where Richtek low Iq LDOs are really suitable.

  • LDO Iq or LDO quiescent current is the current

  • that is consumed by the IC internal feedback control and drive circuits.

  • It is normally measured by measuring the current

  • that flows out of the LDO ground pin.

  • The quiescent current of standard LDOs

  • ranges from 25µA up to 1mA.

  • In applications that need to run from batteries,

  • this can be too high,

  • because even if the LDO output has zero load current,

  • the battery is slowly drained by the LDO quiescent current.

  • The Richtek Low Iq LDO portfolio

  • contains LDOs with quiescent currents down to 1µA,

  • which extends battery life considerably.

  • Here is a typical battery powered application

  • where a micro controller periodically sends out data via an RF link.

  • In order to ensure long battery life,

  • the micro controller is in sleep mode most of the time,

  • consuming only 10µA.

  • When the micro controller and RF section become active,

  • the load momentarily goes up from 10µA to 25mA.

  • The Low Iq LDO RT9063 provides a stable 2.8V supply to the micro controller,

  • and the LDO ground current stays relatively constant at 1µA in the low load range,

  • there by prolonging battery life.

  • But at higher load currents, the ground current increases.

  • This is done to improve the dynamic behavior of the LDO

  • when a sudden high load is encountered,

  • the internal control circuit uses more energy to regulate the output voltage.

  • To show this be havior,

  • here is a transient measurement with a fast load step from 10µA to 25mA

  • due to the LDO's use of dynamic quiescent current,

  • the LDO can react quickly to the load step.

  • The LDO output does not drop more than 1.2%,

  • ensuring stable micro controller operation.

  • The Richtek LDO portfolio contains many low Iq parts.

  • In different packages, with or without an Enable pin

  • and input voltage ranging from 6V up to 36V.

  • For more information, please click the link at the left side,

  • or visit the Richtek website at www.richtek.com

In applications that need to run from a small battery cell for longer periods,

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B1 中級 美國腔

低Iq LDO (Low Iq LDOs)

  • 283 16
    jmkuoa 發佈於 2021 年 01 月 14 日
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