LTC3589: Modifying Register L2DTV2 bit(6:5), will it glitch on PGOOD pin?

Question

Hi, 
 
 I am designing the power section for a Texas Instrument omap-l138, and I want to use the LTC3589. 
 After LDO4 is enabled, I want to write the register L2DTV2 bit(6:5) to change voltage on LDO4 from 2.8v to 3.3v. Is it going to glitch the PGOOD output? I did not find any register to mask LDO4 status from the status output pin PGOOD. I wish to use PGOOD pin as active low reset for the omap-l138 but I cannot allow it to glitch when I need to reprogram LDO4 voltage. 
 
 Thanks,

MartyM · Accepted Answer

Hello, For question 2 the PWR_ON pin does need to be pulled high since this acts like a master on/off pin so needs to be high for outputs to be enabled. 
 There are &ldquo;keep-alive&rdquo; bits on the bucks and LDO2 that override their enables and PWR_ON. 
 The answer for question 3 may be different for different customers. It can be used as a RESET as done for many other ICs. There is also the /RST0 pin which also can be used for a RESET. For this application if using the separate LDO so LDO4 does not need to change and cause a PGOOD from togging it appears PGOOD can work well for this application.)

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LTC3589: Modifying Register L2DTV2 bit(6:5), will it glitch on PGOOD pin?