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BQ76952: REG1 on 'soft shutdown'

Nicholas Bailey
Prodigy 30 points
Part Number: BQ76952

Desired behaviour

 - REG1 should always be available in any circumstances

Notes

 - We are using parallel FET mode so there is no wakeup possible from LD and we do not want a transistor from Charge Input to TS2

 - We do not want a solution which requires OTP to be written

Our proposed solution

 - Stop SHUTDOWN from happening

-  So, tie TS2 low; on very low pack or cell voltage, low voltage protections would cause device to try to enter SHUTDOWN; TS2 tied low will cause device to stick in soft shutdown.

Question

 - Is REG1 enabled (if previously enabled) in soft shutdown? We have searched but cannot find a specification.

  • 0
    TI__Expert 8526 points

    Hi Nicholas, 

    In TS2 Soft SHUTDOWN, the REG1 LDO will be disabled.  In LD Soft SHUTDOWN, the REG1 LDO will remain enabled. TS2 Soft SHUTDOWN will not be a desirable state to meet your criteria. 

    Also note that programming the SHUT_TS2 bit to 1 will not keep REG1 LDO on if SHUTDOWN is attempted.  The resulting low-power state does not enable the REG1 and REG2 LDOs.

    Best,

    Andria