Dear Madam / Sir.
In a new transceiver design I am using one of your components (TPS54335) to covert a battery voltage of 8V to 3.3V.
This 3.3V is powering the receiver section and part of the transmitter section. When the transmitter is switched off my design is consuming about 49 mA @ 8V. This configuration work very good @ ambient and I see that the ripple on the 3.3V real is low. But when the temperature drops to -4 degree and below to -20 I measure a high output ripple > 200mV and the mean voltage of the 3.3V drops to 2.7V.
This behavior has been seen on 2 out of 10 boards. When the transmitter section is switched on and the current consumption increases this ripple is gone and the mean voltage is 3.3V again. To resolve this issue I replaced the components and repeated the test in a thermal chamber. After replacing this component with a new device this behavior was gone
See the schemetics:
My question are:
1) Is there a minimum current and/or temperature where this output ripple is guaranteed?
2) Is there a difference between a TPS54335 that a bought a half year ago and the TSP54335A that is now available ?
