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3. TECHNICAL BRIEF
3.2.6 Power Supply Start-up sequence
In order to avoid an excessive drop on the battery voltage caused by in-rush current during system
power-on, possibly leading to system instability and "hick-ups" a staggered turn-on approach for the
regulators is implemented. The regulators are turned on in a well defined sequence, thus spreading the
in-rush current transients over time.
The IO's of X-GOLD TM 213 are isolated in OFF mode (core supply is off). The isolation signal is controlled
by the PMU state machine. This ensures that the PADs are in a well defined state during core supply
settling. This allows to power up the LCORE core regulator and wait for the core to reach reset state
before powering up the I/O supply regulators.
LGE Internal Use Only
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Copyright © 2010 LG Electronics. Inc. All right reserved.
3. TECHNICAL BRIEF
Only for training and service purposes
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