I have a battery application that requires very light loads and the Vout Accuracy of the TPS715 is not specified below 100uA. Do we have any data on Vout Accuracy from 1-10uA? If not ,can you suggest an alternate part? The requirements for this application are as follows:
The standby current of our slave IC is only 1µA, the master has to send a “wake-up” signal. We can’t add any dummy loads to increase load current, either, bec that will cause the pack to drain too quickly. Has TI characterized the voltage increase if I-load is this low?
Since the slave must be compatible with voltages of the master that range between 3.10-5.25V, and logic transitions are acknowledged when 0.7*Vcc is reached, the thought was to adjust the LDO to get nominal Vcc of 4.036V, and with an assumption of a Voltage Accuracy of 4%, we would guarantee enough voltage to ensure logic transitions are read properly. If Vout Accuracy is significantly worse at light loads (1-10uA) the TPS71501 may not be the best fit for this application. If that's the case, please recommended another adjustable regulator assuming the following criteria:
- Quiescent current draw no more than 10µA.
- Load currents will vary from 1µA in standby/sleep mode to 10mA maximum in operational mode.
- Input voltage must be able to handle at least 21V.
- Adjustable output voltage.
- Small package, of course, as it needs to fit within a battery module.
Thank you, John Garrett TI-AFA