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LTC4065L Constant Current Mode Erroneously Ramping Down

Category: Hardware
Product Number: LTC4065L
Software Version: N/A

We have been using an LTC4065L to charge a 250 mAh Capacity battery. We have the PROG resistor set to 800-Ohm, for 250 mA current delivery.

Page 5 of the datasheet shows the LTC4065L providing 250 mA for a battery with a voltage between 3 to 4V.

Using a NI PXie datalogger to log VBat and IBat, we are only seeing >200 mA, when VBat is <3.75 V. Note: The PXie reads VBat 50 mV higher than a trusted DMM.

How can we update the design to get 250 mA delivered to the battery from 3.75 V to 4.00 V?