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Power Management – UICC Powering

Power Management – UICC Powering. Basic LDO Constraints. The quiescent current is related to the performances. For usual LDO the quiescent current is less than 15 µA if: The acceptable voltage drop during load transient is not tight (< 100 mV) The current range is not too wide (e.g. < 100 mA).

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Power Management – UICC Powering

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  1. Power Management – UICC Powering

  2. Basic LDO Constraints • The quiescent current is related to the performances. • For usual LDO the quiescent current is less than 15 µA if: • The acceptable voltage drop during load transient is not tight (< 100 mV) • The current range is not too wide (e.g. < 100 mA)

  3. CLF Power Management <5µA • Current consumption distribution < 10µA < 2 µA < 8 µA Idle mode: No communication on going

  4. Engineering Compromises • Battery off mode • Require a low output decoupling capacitor < 500 nF • Require a low tank capacitor < 2.2 µF • Battery on mode • Class C* support (1.75V up to 1.95V) • Current peak up to 100 mA • Idle mode current < 25 µA (UICC LDO,…) • VCC nominal 1.88V in order to have 100 mV voltage drop margin and a low power LDO • Power off • The UICC and all CLF functions are switched off • Standby current << 5µA

  5. Conclusion • Impact on the battery lifetime • Negligible (<1%) and far bellow the GSMA requirements (< 10%) • Technical challenge • None if the UICC VCC nominal voltage in class C* is centered around 1.85V instead 1.8V

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