Category: Hardware
Product Number: LTC3351
I am seeing a start up anomaly with the LTC3351 when the ambient temperature is -40°C. The circuit starts up as expect at -35°C and above.
Ch1 (yellow): 12V in
Ch2 (green): Vout
Ch3 (blue): CTimer
Ch4 (pink): 3V3 regulator output powered by Vout
Time base = 1s per division
Ch1 (yellow): 12V in
Ch2 (green): Vout
Ch3 (blue): Vcap
Ch4 (pink): 3V3 regulator output powered by Vout
Time base = 1s per division
The circuit is very similar to DC2464A-A with a backup voltage set to 10V instead of 6V of the eval board.
What condition would cause the Vout to have this start-up characteristic at cold temperature?