LT8653S : How high a voltage can VOUT be, based on the Feedback Resistor programming.

Question

LT8653S : How high a voltage can VOUT be, based on the Feedback Resistor programming. Can VOUT after the inductor be 5.5VDC, for instance, or 4.0VDC?

MarkusHP · Accepted Answer

Hello, 
 
 first of all the possible Vout depends on the available Vin (it's still a buck regulator) 
 VREF for adjustable output is 0.8V, with this value the feedback resistors for your desired Vout can be calculated. 
 On top the possible duty cycle may potential limit your desired Vout. This depends on your Vin/Vout ratio and the selected switching frequency 
 
 So four your given values of 5.5V or 4.0V: As long as you have a sufficient Vin available: no problem! 
 You will find more details in the datasheet (frequency selection, formulas etc))

MarkusHP · Answer

Hello, 
 the datasheet reflects and focus on the small and space saving solutions by using fixed Vout with D0/D1 pins. I was not involved in the datasheet process, I work in field apps. When 24V are available 12V can be configured as output voltage with a resistor combination of 10k (bottom) and 140k (top). Please connect D0/D1 appropriately.

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LT8653S : How high a voltage can VOUT be, based on the Feedback Resistor programming.